Plastic hot runner heater with double heating modes

Abstract

The utility model relates to the field of hot runner heaters, and particularly discloses a double-heating-mode plastic hot runner heater, which comprises an inner heating mechanism, an outer heating mechanism, an inner heating mechanism and a heating mechanism, the outer heating copper sleeve is arranged on the outer side of the flow guide assembly, and the outer heating copper sleeve is connected with an external power supply system through a wound induction coil; the flow guide assembly comprises a magnetic flow guide pipe fitting, and the lower side of the magnetic flow guide pipe fitting is fixedly connected with a heating piece through a screw rod; according to the utility model, through the heating piece in the internal heating mechanism and the external induction coil, the molten plastic can be directly heated, and the heating efficiency is high; meanwhile, the outer heating copper sleeve is connected with an external power supply system through a coil, the magnetic flow guide pipe fitting can be heated, and the heating effect is further improved; by means of the double-heating mode, accurate control over the plastic melting process can be achieved, and it is ensured that the plastic reaches the ideal temperature state in the heating process.

Description

Technical Field

[0001] The utility model belongs to the field of hot runner heaters, in particular to a plastic hot runner heater with a double heating mode. Background Art

[0002] During the injection molding process, the flow properties of plastics have a significant impact on the quality and dimensional accuracy of the product. If the plastic does not flow smoothly or becomes clogged during heating, it may lead to reduced product quality and lower production efficiency.

[0003] The hot runner heating system heats the plastic in the runner and gate to keep it molten so that it can be smoothly injected into the mold cavity during the injection molding process. The basic principle is to use the heat generated by the heater to transfer heat to the plastic in the runner through heat conduction, causing it to reach a molten state.

[0004] Traditional hot runner heaters often use a single heating method, such as heating the molten plastic only through external heating or internal heating. However, this method has the problem of low heating efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the present invention provides a plastic hot runner heater with dual heating methods to solve the problem that traditional hot runner heaters in the prior art often adopt a single heating method, such as heating the molten plastic only by external heating or internal heating. However, this method has the problem of low heating efficiency.

[0006] Plastic hot runner heater with dual heating mode, including:

[0007] The internal heating mechanism comprises a flow guide assembly and an outer closed steel sleeve assembly mounted on the outside of the flow guide assembly;

[0008] An external heating copper sleeve is provided on the outside of the guide assembly, and the external heating copper sleeve is connected to an external power supply system via a wound induction coil;

[0009] The flow guide assembly includes a magnetic flow guide pipe, and the lower side of the magnetic flow guide pipe is fixedly connected to a heating element via a screw;

[0010] The magnetic flow guide pipe comprises a magnetic flow guide pipe body, the lower end of the outer side of the magnetic flow guide pipe body is fixedly connected to a limit ring, and a flow guide channel 1 is further provided inside the magnetic flow guide pipe body, the lower end of the flow guide channel 1 is provided with an inlet hole 1, and the upper end of the flow guide channel 1 is provided with an outlet hole 1;

[0011] The heating element includes a heating block, a heating wire limiting groove is provided on the outer side of the heating block, an induction coil is further provided on the heating wire limiting groove, and the induction coil and the external power supply system are connected to each other. A second flow guide channel is further provided inside the heating block, a second inlet hole is provided at the lower end of the second flow guide channel, and a second outlet hole is provided at the upper end of the second flow guide channel. A fixing hole is also provided through the heating block;

[0012] The heating element and the magnetic guide pipe are fixed by a screw that passes through the fixing hole 1 from the bottom and then is embedded in a limiting ring. The outlet hole 2 and the inlet hole 1 are aligned.

[0013] Preferably, the outer closed steel sleeve assembly includes an outer closed steel sleeve member, and the lower side of the outer closed steel sleeve member is fixedly connected to a bottom cover member via screws.

[0014] Preferably, the outer closed steel set comprises an outer closed steel set body;

[0015] The bottom cover member includes a bottom cover body, a positioning outer ring is provided on the outer side of the bottom cover body, and a second fixing hole is formed through the positioning outer ring;

[0016] The bottom cover body is embedded in the bottom of the outer closed steel sleeve body.

[0017] Preferably, the positioning outer ring and the lower edge of the outer closed steel sleeve body are in conflict with each other, and the bottom cover and the outer closed steel sleeve are fixed by inserting the screw into the outer closed steel sleeve body after passing through the second fixing hole;

[0018] The magnetic flow guide pipe and the heating element are limitedly arranged in the outer closed steel set and the bottom cover in a connected state.

[0019] Preferably, the internal heating mechanism further includes a top valve assembly;

[0020] The top valve assembly comprises a piston block and a top valve needle. The piston block is slidably embedded in the outer closed steel set and the bottom cover in a connected state.

[0021] Preferably, the piston block comprises a piston block body, an outer push ring is fixedly connected to the outer side of the piston block body, a cross bar is fixedly connected to the inner side of the piston block body, and a limiting groove is further provided on the cross bar;

[0022] The ejector valve needle comprises an ejector valve needle body, one end of which is fixedly connected to a limit head, and the limit head is slidably and limitedly clamped in a limit groove;

[0023] The outlet hole 1 at the upper end of the guide channel 1 is also provided with an inwardly contracted outlet, and the valve pin body will block the inwardly contracted outlet when it moves upward;

[0024] A movable groove is also provided in the middle of the upper side of the heating block, and the cross bar is slidably engaged in the movable groove;

[0025] The outer side of the outer closed steel sleeve body is also provided with air inlet hole 1 and air inlet hole 2, and the outer push ring is located between air inlet hole 1 and air inlet hole 2. The air inlet hole 1 and air inlet hole 2 are connected to each other through a pipeline and an external air source.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The heating element in the internal heating mechanism and the external induction coil can directly heat the molten plastic with high heating efficiency. At the same time, the external heating copper sleeve is connected to the external power supply system through the coil to heat the magnetic guide pipe, further improving the heating effect. This dual heating method can achieve precise control of the plastic melting process, ensuring that the plastic reaches the ideal temperature during the heating process.

[0028] The top valve assembly allows the flow of molten plastic to be precisely adjusted. By controlling the external air source to supply air to the air inlet, the piston block can be pushed to move, thereby driving the top valve needle to move, and controlling the opening and closing of the inward-contracted outlet at the upper end of the flow guide. This adjustment method can meet the requirements of different injection molding or molding processes for plastic flow, thereby improving the flexibility and controllability of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0030] Figure 2 It is a cross-sectional view of the utility model;

[0031] Figure 3 It is a two-dimensional diagram of the present utility model;

[0032] Figure 4 This is a schematic diagram of the cross-sectional exploded structure of the utility model;

[0033] Figure 5 This is a schematic diagram of the cross-sectional exploded structure of the diversion component of the present invention;

[0034] Figure 6 This is a schematic diagram of the cross-sectional exploded structure of the outer closed steel sleeve assembly of the present utility model;

[0035] Figure 7 This is a schematic diagram of the cross-sectional exploded structure of the top valve assembly of the utility model.

[0036] In the figure: 1. Internal heating mechanism; 11. Flow guide assembly; 111. Magnetic flow guide pipe; 1111. Magnetic flow guide pipe body; 1112. Limiting ring; 1113. Flow guide channel 1; 1114. Inwardly contracted outlet; 112. Heating element; 1121. Heating block; 1122. Heating wire limiting groove; 1123. Flow guide channel 2; 1124. Fixing hole 1; 1125. Movable groove; 12. Externally enclosed steel sleeve assembly; 121. Externally enclosed steel sleeve assembly; 1211 , outer closed steel sleeve body; 1212, air inlet hole one; 1213, air inlet hole two; 122, bottom cover; 1221, bottom cover body; 1222, positioning outer ring; 1223, fixing hole two; 13, top valve assembly; 131, piston block; 1311, piston block body; 1312, outer push ring; 1313, cross bar; 1314, limiting groove; 132, top valve needle; 1321, top valve needle body; 1322, limiting head; 2, external heating copper sleeve. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figures 1 to 6 As shown:

[0039] Embodiment 1: The present invention provides a plastic hot runner heater with dual heating modes, comprising:

[0040] The internal heating mechanism 1 comprises a flow guide assembly 11 and an outer closed steel sleeve assembly 12 installed outside the flow guide assembly 11;

[0041] An external heating copper sleeve 2 is provided on the outside of the guide assembly 11 and is connected to an external power supply system via a wound coil;

[0042] Among them, the external heating copper sleeve 2 uses the induction heating principle to externally heat the plastic, and works in conjunction with the internal heating mechanism to improve heating efficiency and temperature control accuracy.

[0043] The flow guide assembly 11 includes a magnetic flow guide pipe 111 , and a heater 112 is fixedly connected to the lower side of the magnetic flow guide pipe 111 via a screw;

[0044] The magnetic flow guide pipe 111 includes a magnetic flow guide pipe body 1111. The lower end of the outer side of the magnetic flow guide pipe body 1111 is fixedly connected to a limit ring 1112. The interior of the magnetic flow guide pipe body 1111 is further provided with a flow guide channel 1113. The lower end of the flow guide channel 1113 is provided with an inlet hole 1, and the upper end of the flow guide channel 1113 is provided with an outlet hole 1.

[0045] Among them, a guide channel is provided inside the magnetic guide tube body 1111 for plastic to pass through; a limiting ring 1112 is fixedly connected to the outer side of the lower end of the magnetic guide tube body 1111, and is used to be fixedly connected to the heating element; a guide channel 1113 is provided inside the magnetic guide tube body 1111, and the plastic flows in from the inlet hole 1 at the lower end through this channel and flows out from the outlet hole 1 at the upper end.

[0046] The heating element 112 includes a heating block 1121. A heating wire limiting groove 1122 is provided on the outer side of the heating block 1121. An induction coil is also provided on the heating wire limiting groove 1122. The induction coil is connected to an external power supply system. A second flow guide 1123 is also provided inside the heating block 1121. A second inlet hole is provided at the lower end of the second flow guide 1123, and a second outlet hole is provided at the upper end of the second flow guide 1123. A first fixing hole 1124 is also provided through the heating block 1121.

[0047] Among them, the heating block 1121 is provided with a second guide channel connected to the first guide channel, and the outside of the heating block is provided with a heating wire limiting groove for installing the induction coil; the heating wire limiting groove 1122 is opened on the outside of the heating block, used to position and fix the induction coil, ensuring good contact and heat transfer between the coil and the heating block; the induction coil is arranged in the heating wire limiting groove and connected to the external power supply system. When powered on, the induction coil generates a magnetic field and induces eddy currents in the heating block, thereby generating heat; the second guide channel 1123 is arranged inside the heating block and connected to the first guide channel. The plastic flows in from the second inlet hole at the lower end through this channel and flows out from the second outlet hole at the upper end and is heated at the same time; the first fixing hole 1124 is opened through the heating block and is used to fix the heating element to the magnetic guide pipe by a screw;

[0048] The heating element 112 and the magnetic flow guide pipe 111 are fixed by screws passing through the fixing hole 1124 from the bottom and then embedded in the limiting ring 1112. The outlet hole 2 and the inlet hole 1 are aligned.

[0049] When in use, the external power supply system is turned on so that the external heating copper sleeve 2 and the induction coil embedded in the heating wire limiting groove 1122 work together, and the molten plastic will be injected into the heating block 1121 through the inlet hole 2 at the lower end of the guide channel 2 1123. The external power supply system works so that the induction coil embedded in the heating wire limiting groove 1122 generates current, thereby heating the heating block 1121. After the heating block 1121 is heated, the molten plastic inside will be further heated and then enter the guide channel 1 1113 from the outlet hole 1 at the upper end of the guide channel 2 1123. When the molten plastic is located inside the magnetic guide tube body 1111, the magnetic guide tube body 1111 can be heated by the external heating copper sleeve 2, thereby further heating the molten plastic. Finally, the heated molten plastic will be discharged through the outlet hole 1 at the upper end of the guide channel 1 1113.

[0050] Specifically, the outer closed steel sleeve assembly 12 includes an outer closed steel sleeve 121 , and the lower side of the outer closed steel sleeve 121 is fixedly connected to a bottom cover 122 via screws.

[0051] Specifically, the outer closed steel set 121 includes an outer closed steel set body 1211;

[0052] The bottom cover 122 includes a bottom cover body 1221 , a positioning outer ring 1222 is provided on the outer side of the bottom cover body 1221 , and a second fixing hole 1223 is formed through the positioning outer ring 1222 ;

[0053] The bottom cover body 1221 is embedded in the bottom of the outer closed steel sleeve body 1211;

[0054] Among them, the outer closed steel sleeve body 1211 is made of high-strength, corrosion-resistant steel. It surrounds the outside of the guide assembly 11 to provide necessary protection and support; the bottom cover body 1221 is the core part of the bottom cover part. It is designed with a shape and size that matches the outer closed steel sleeve body to ensure that the two can fit closely. The bottom cover body is also responsible for sealing the bottom of the heater to prevent heat loss; the positioning outer ring 1222 is an annular structure on the outside of the bottom cover body. It is used to interfere with the lower edge of the outer closed steel sleeve body to ensure that the bottom cover part can be correctly installed and fixed in the appropriate position; the second fixing hole 1223 is a hole opened through the positioning outer ring, which is used to fix the bottom cover part to the outer closed steel sleeve by screws. These holes ensure a firm connection between the bottom cover part and the outer closed steel sleeve, preventing the heater from loosening or deformation during use.

[0055] Specifically, the positioning outer ring 1222 and the lower edge of the outer closed steel sleeve body 1211 are in conflict with each other, and the bottom cover 122 and the outer closed steel sleeve 121 are fixed by inserting the screw through the second fixing hole 1223 and then embedding into the outer closed steel sleeve body 1211;

[0056] The magnetic flow guide pipe 111 and the heating element 112 are limitedly disposed in the outer closed steel sleeve 121 and the bottom cover 122 in a connected state.

[0057] As can be seen from the above, the outer closed steel sleeve assembly 12 consists of an outer closed steel sleeve kit 121 and a bottom cover 122, which are fixedly connected by screws. The outer closed steel sleeve 121 includes an outer closed steel sleeve body 1211, and the bottom cover 122 includes a bottom cover body 1221 and a positioning outer ring 1222 on its outer side. The positioning outer ring is provided with a second fixing hole 1223 for fixation. The bottom cover body 1221 is cleverly embedded in the bottom of the outer closed steel sleeve body 1211 and is firmly embedded in the outer closed steel sleeve body through the second fixing hole 1223 by a screw, thereby achieving a stable connection. In this connection state, the magnetic guide pipe 111 and the heating element 112 are limitedly set in the space formed by the outer closed steel sleeve kit 121 and the bottom cover 122, ensuring the structural compactness and stability of the entire heater.

[0058] like Figures 1 to 5 and Figure 7 As shown:

[0059] Embodiment 2: This embodiment is basically the same as the previous embodiment, except that the internal heating mechanism 1 further includes a top valve assembly 13;

[0060] The top valve assembly 13 includes a piston block 131 and a top valve needle 132 . The piston block 131 is slidably embedded in the outer closed steel sleeve 121 and the bottom cover 122 in a connected state.

[0061] Specifically, the piston block 131 includes a piston block body 1311, an outer push ring 1312 is fixedly connected to the outer side of the piston block body 1311, and a cross bar 1313 is fixedly connected to the inner side of the piston block body 1311. A limiting groove 1314 is also provided on the cross bar 1313.

[0062] Among them, the piston block body 1311 is the core part of the piston block. It has a shape and size that matches the outer closed steel sleeve body 1211 and the bottom cover 122 to ensure that it can slide and fit therein; the outer push ring 1312 is located between the air inlet hole 1212 and the air inlet hole 2 1213. When an external air source supplies air to the air inlet holes through the pipeline, the outer push ring will be affected by the air pressure and push the piston block body to move; the cross bar 1313 passes through the movable groove 1125 on the heating block 1121 and is connected to the top valve needle 132. The cross bar 1313 also has a limiting groove 1314 for sliding and limiting the locking with the limiting head 1322 on the top valve needle to ensure a stable connection and synchronous movement between the two;

[0063] The top valve needle 132 includes a top valve needle body 1321 , one end of which is fixedly connected to a limit head 1322 , and the limit head 1322 is slidably limited and embedded in the limit groove 1314 ;

[0064] Among them, the top valve needle body 1321 is the main part of the top valve needle component. It is designed with a shape and size that matches the inward-retracted outlet 1114. When the top valve needle body moves upward, it will block the inward-retracted outlet, thereby controlling the flow of plastic; the limit head 1322 is a structure fixedly connected to one end of the top valve needle body, and its sliding limit card is embedded in the limit groove 1314 of the piston block. This limit design ensures a stable connection and synchronous movement between the top valve needle component and the piston block.

[0065] An inwardly contracted outlet 1114 is further provided at the outlet hole 1 at the upper end of the flow guide channel 1113. When the valve needle body 1321 moves upward, the inwardly contracted outlet 1114 is blocked.

[0066] A movable groove 1125 is further provided in the middle of the upper side of the heating block 1121, and the cross bar 1313 is slidably engaged in the movable groove 1125;

[0067] An air inlet hole 1212 and an air inlet hole 2 1213 are also provided on the outside of the outer closed steel sleeve body 1211. The outer push ring 1312 is located between the air inlet hole 1212 and the air inlet hole 2 1213. The air inlet hole 1212 and the air inlet hole 2 1213 are connected to each other through a pipeline and an external air source.

[0068] As can be seen from the above, the top valve assembly consists of a piston block 131 and a top valve needle 132, wherein the piston block 131 is slidably embedded in the outer closed steel kit 121 and the bottom cover 122, and is connected to the limit head 1322 at one end of the top valve needle body 1321 through the limit groove 1314 on the cross bar 1313, thereby realizing the installation of the top valve needle 132. At the same time, after the overall installation is completed, the magnetic guide pipe 111 will further position the top valve needle 132. When the external air source applies pressure to the outer push ring 1312 of the piston block 131 through the air inlet hole 1212 or the air inlet hole 2 1213, the piston block will drive the top valve needle 132 to move upward or downward, thereby controlling the opening and closing of the inwardly contracted outlet 1114 at the upper end of the guide channel 1113, thereby accurately adjusting the outflow of molten plastic.

[0069] Application Process:

[0070] Preparation stage:

[0071] Make sure the external power supply system is connected and working properly, and check whether the gas supply system needs to be connected.

[0072] Check whether the external heating copper sleeve and the induction coil in the heating wire limit groove are installed correctly and connected correctly.

[0073] Confirm that the magnetic guide tube and heater are properly fixed with screws, and that guide channel 1 and guide channel 2 are aligned and unobstructed.

[0074] The molten plastic is injected into the second inlet hole at the lower end of the second guide channel.

[0075] Heating and control stage:

[0076] Heating process:

[0077] Turn on the external power supply system to start the external heating copper sleeve and the induction coil.

[0078] The magnetic field generated by the induction coil induces eddy currents in the heating block, heating the heating block and the molten plastic inside.

[0079] At the same time, the external heating copper sleeve heats the magnetic flow guide tube body through the induction heating principle, further heating the molten plastic flowing through it.

[0080] Top valve control:

[0081] As needed, air is supplied to the air inlet through an external air source to control the movement of the piston block.

[0082] When the piston block moves, the top valve needle is driven to move through the cross rod and the limit groove, thereby controlling the opening and closing of the inwardly contracted outlet at the upper end of the flow guide channel.

[0083] Plastic flow and export stage:

[0084] The heated molten plastic flows into the first flow guide channel from the second outlet hole at the upper end of the second flow guide channel.

[0085] The molten plastic continues to be heated in the magnetic guide tube body and is discharged through the outlet hole at the upper end of the guide channel for subsequent injection molding or forming process.

[0086] By precisely controlling the movement of the ejector needle, the outflow of molten plastic can be precisely adjusted to meet different injection molding or forming requirements.

[0087] Closing and cleanup phase:

[0088] After completing the injection or molding task, turn off the external power supply system and air supply system.

[0089] After the heater cools down, perform necessary cleaning and maintenance to ensure long-term stable operation of the equipment.

[0090] All standard parts used in this utility model can be purchased commercially, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as bolts, rivets, welding, etc. that are mature in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. In addition, the circuit connections adopt conventional connection methods in the existing technology and will not be described in detail here. Any matters not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0091] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0092] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0093] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0095] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0096] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Double heating mode plastic hot runner heater, characterized by: include: The internal heating mechanism (1) comprises a flow guide assembly (11) and an external closed steel sleeve assembly (12) installed outside the flow guide assembly (11); An external heating copper sleeve (2) is arranged outside the guide assembly (11), and the external heating copper sleeve (2) is connected to an external power supply system via a wound coil; The flow guide assembly (11) comprises a magnetic flow guide pipe (111), and the lower side of the magnetic flow guide pipe (111) is fixedly connected to a heating element (112) via a screw; The magnetic flow guide pipe (111) comprises a magnetic flow guide pipe body (1111), the lower end of the outer side of the magnetic flow guide pipe body (1111) is fixedly connected to a limiting ring (1112), and a flow guide channel (1113) is further provided inside the magnetic flow guide pipe body (1111), the lower end of the flow guide channel (1113) is provided with an inlet hole (1), and the upper end of the flow guide channel (1113) is provided with an outlet hole (1); The heating element (112) comprises a heating block (1121), a heating wire limiting groove (1122) is provided on the outer side of the heating block (1121), an induction coil is provided on the heating wire limiting groove (1122), and the induction coil and the external power supply system are connected to each other. A second flow guide (1123) is provided inside the heating block (1121), a second inlet hole is provided at the lower end of the second flow guide (1123), and a second outlet hole is provided at the upper end of the second flow guide (1123). A fixing hole (1124) is also provided through the heating block (1121); The heating element (112) and the magnetic flow guide pipe (111) are fixed by a screw that passes through the first fixing hole (1124) from the bottom and then is embedded in the limiting ring (1112). The second outlet hole and the first inlet hole are aligned.

2. The dual heating plastic hot runner heater according to claim 1, characterized in that: The outer closed steel sleeve assembly (12) comprises an outer closed steel sleeve member (121), and the lower side of the outer closed steel sleeve member (121) is fixedly connected to a bottom cover member (122) via a screw.

3. The dual heating plastic hot runner heater according to claim 2, characterized in that: The outer closed steel sleeve (121) comprises an outer closed steel sleeve body (1211); The bottom cover member (122) comprises a bottom cover body (1221), a positioning outer ring (1222) is provided on the outer side of the bottom cover body (1221), and a second fixing hole (1223) is provided through the positioning outer ring (1222); The bottom cover body (1221) is embedded in the bottom of the outer closed steel sleeve body (1211).

4. The dual heating plastic hot runner heater according to claim 3, characterized in that: The positioning outer ring (1222) and the lower edge of the outer closed steel sleeve body (1211) are in contact with each other, and the bottom cover (122) and the outer closed steel sleeve (121) are fixed by inserting a screw through the second fixing hole (1223) and then embedding into the outer closed steel sleeve body (1211); The magnetic flow guide pipe (111) and the heating element (112) are limitedly arranged in the outer closed steel sleeve (121) and the bottom cover (122) in a connected state.

5. The dual heating plastic hot runner heater according to claim 2, characterized in that: The internal heating mechanism (1) further includes a top valve assembly (13); The top valve assembly (13) comprises a piston block (131) and a top valve needle (132), wherein the piston block (131) is slidably embedded in the outer closed steel set (121) and the bottom cover (122) in a connected state.

6. The dual heating plastic hot runner heater according to claim 5, characterized in that: The piston block (131) comprises a piston block body (1311), an outer push ring (1312) is fixedly connected to the outer side of the piston block body (1311), a cross bar (1313) is fixedly connected to the inner side of the piston block body (1311), and a limiting groove (1314) is also provided on the cross bar (1313); The top valve needle member (132) comprises a top valve needle body (1321), one end of the top valve needle body (1321) is fixedly connected to a limiting head (1322), and the limiting head (1322) is slidably limited and embedded in the limiting groove (1314); An inwardly contracted outlet (1114) is further provided at the outlet hole 1 at the upper end of the flow guide channel 1 (1113), and the inwardly contracted outlet (1114) is blocked when the top valve needle body (1321) moves upward; A movable groove (1125) is further provided at the middle position of the upper side of the heating block (1121), and the cross bar (1313) is slidably engaged in the movable groove (1125); The outer side of the outer closed steel sleeve body (1211) is also provided with an air inlet hole 1 (1212) and an air inlet hole 2 (1213), and the outer push ring (1312) is located between the air inlet hole 1 (1212) and the air inlet hole 2 (1213), and the air inlet hole 1 (1212) and the air inlet hole 2 (1213) are both connected to each other through a pipeline and an external air source.

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