Heater connecting assembly of hot runner system and heater electric connecting system

Abstract

The invention belongs to the technical field of hot runner systems, and relates to a heater connecting assembly of a hot runner system and a heater electric connecting system. Comprising an electric connecting piece made of metal materials, the electric connecting piece comprises a first connecting terminal and a second connecting terminal, the first connecting terminal is used for being connected with a cable, the second connecting terminal is used for being connected with a heater pin, and an included angle alpha is formed between the axis of the first connecting terminal and the axis of the second connecting terminal. Alpha is larger than 0 degree and smaller than 180 degrees, so that the installation direction of the cable and the installation direction of the heater pin of the second connecting terminal are located in the angle interval, and the electric connecting piece is provided with a high-temperature-resistant insulating shell which is at least partially covered. Compared with the prior art, the structure has the advantages that the structure is compact, the spatial layout and the anti-interference capability are optimized, and key support is provided for designing a more compact hot runner system.

Description

Technical Field

[0001] This invention belongs to the technical field of hot runner systems, and relates to a heater connection assembly and heater electrical connection system for a hot runner system. Background Technology

[0002] In existing technologies, electrical connectors used to connect heater pins to cables are typically strip-shaped metal blocks. This "straight-through" layout strictly limits the cable's exit direction to being completely aligned with the axial direction of the heater pins. In actual mold spaces, the area around the heater is usually compact, containing other heaters, thermocouples, seals, or the mold body itself. Leading the cable out in a straight line along the pin's axial direction often requires reserving a long, straight clearance space, which can easily interfere with surrounding components, leading to complex mold designs, increased overall dimensions, or even making installation impossible in limited spaces.

[0003] Therefore, in order to solve the problems of inflexible hot runner system layout and large installation space requirements caused by the fixed cable lead-out direction, it is necessary to improve the structure of the heater connection assembly so that it can change the lead-out direction of the cable relative to the heater pin, thereby optimizing wiring, reducing space occupation and avoiding interference. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a heater connection assembly for a hot runner system.

[0005] Another object of the present invention is to provide a heater electrical connection system for a hot runner system.

[0006] To achieve the above objectives, the present invention employs the following technical solution: The heater connection assembly of this hot runner system is characterized by comprising an electrical connector made of metal material. The electrical connector includes a first connection terminal and a second connection terminal. The first connection terminal is used to connect a cable, and the second connection terminal is used to connect heater pins. An angle α is formed between the axis of the first connection terminal and the axis of the second connection terminal, where α is greater than 0 degrees and less than 180 degrees, such that the cable installation direction and the heater pin installation direction of the second connection terminal are within this angle range. The electrical connector is provided with a high-temperature resistant insulating shell that at least partially covers the connection assembly. This structure significantly reduces the linear installation space required for the connection assembly in the mold, effectively preventing interference between the cable and other closely arranged components, thereby optimizing space utilization and making the hot runner system more compact.

[0007] In the heater connection assembly of the aforementioned hot runner system heater, the electrical connector is fixed to the high-temperature resistant insulating shell via a detachable structure. This greatly facilitates the production, assembly, daily maintenance, and replacement of the assembly after damage. Furthermore, when the shell is damaged or the electrical connector needs repair, only the faulty component can be replaced, without discarding the entire assembly, thus reducing maintenance costs and improving the maintainability and service life of the assembly.

[0008] In the heater connection assembly of the aforementioned hot runner system heater, the detachable structure includes any one or more of the following: snap-fit ​​structure, finned structure, inverted snap-fit ​​structure, or concave-convex structure. Through a reliable and simple mechanical interlocking scheme, no additional fasteners or tools are required, enabling rapid "click-in" installation and disassembly, further simplifying the assembly process, improving production efficiency, and ensuring the stability of the connection.

[0009] In the heater connection assembly of the aforementioned hot runner system heater, the second connection terminal side is provided with at least one elastic snap, the elastic snap being embedded in a snap groove within a high-temperature resistant insulating shell; and / or, The second connecting terminal has at least one lug on its side, and the high-temperature resistant insulating shell has a groove inside that can mate with the lug.

[0010] The above structure ensures the reliability and consistency of the connection between the housing and the electrical connectors, while maintaining ease of manual operation. In the heater connection assembly of the aforementioned hot runner system heater, the high-temperature resistant insulating shell is further provided with a connecting groove that allows the snap-fit ​​groove to communicate with the outside. This greatly facilitates disassembly operations. Through the connecting groove, the elastic snap-fit ​​can be quickly accessed and pressed from the outside, thereby easily separating the shell, solving the problem of difficult disassembly, and improving the maintainability of the component.

[0011] In the heater connection assembly of the aforementioned hot runner system heater, at least one of the first and second connection terminals is equipped with a quick-release structure. This significantly simplifies the process of establishing and disconnecting electrical connections. Compared to traditional welding or screw fastening methods, the quick-release structure enables rapid connection and disconnection without special tools or with only simple tools, greatly improving the efficiency of heater installation, replacement, and system maintenance, and reducing labor costs and downtime.

[0012] In the heater connection assembly of the aforementioned hot runner system heater, the first connection terminal is connected to the cable via a first crimping structure or a first welding structure. The first crimping structure includes at least one pressure lug disposed on the side of the first connection terminal, capable of deforming under external force. This provides a reliable and efficient solution for cable connection. The crimping method ensures a large contact area and low contact resistance through deformation, resulting in a strong and consistent connection; welding, on the other hand, achieves a permanent connection. Both methods meet the reliability requirements of high current transmission, and the crimping method is particularly convenient for on-site construction and quality inspection.

[0013] In the heater connection assembly of the aforementioned hot runner system heater, the second connection terminal is connected to one end of the third connection terminal via a male-female quick-release fixing structure, and the other end of the third connection terminal is connected to the heater pin. This achieves a "quick plug-and-play" function between the cable assembly and the heater body. This allows for direct separation of the quick-release interface without touching the crimp or solder joints at the cable end when the heater needs to be replaced, greatly protecting the cable assembly, simplifying the replacement process, and representing a key improvement in maintenance convenience.

[0014] In the heater connection assembly of the aforementioned hot runner system heater, the quick-release fixing structure includes a protrusion on the outer surface of a plate-shaped second connecting terminal. Both sides of the outer surface of the second connecting terminal have C-shaped pressure bodies, with the protrusion located between the pressure bodies. An insertion space for a third connecting terminal is provided between the outer surface of the second connecting terminal and the C-shaped pressure bodies. The third connecting terminal has a locking hole that mates with the protrusion. The inner end of the second connecting terminal has a lever for unlocking the engagement between the protrusion and the locking hole. The high-temperature resistant insulating shell has a lever hole for communicating with the outside. This design achieves quick insertion and removal while providing clear feedback on the locking status and reliable anti-vibration loosening protection. The engagement between the protrusion and the locking hole ensures automatic locking after connection. The dedicated lever unlocking mechanism ensures quick disassembly and prevents accidental detachment during use, improving the safety and reliability of the system in vibration environments.

[0015] In the heater connection assembly of the aforementioned hot runner system heater, a deformation bend is provided between the inner ends of the first and second connection terminals, and the lever is disposed on the bend. Unlocking via the lever improves ease of unlocking.

[0016] In the heater connection assembly of the aforementioned hot runner system heater, the deformable bending portion is provided with protruding protective wings on both sides, and / or the width of the deformable bending portion gradually decreases from one end to the other. In the heater connection assembly of the aforementioned hot runner system heater, the third connection terminal is connected to the heater pins via a third crimping structure or a third welding structure. This ensures the ultimate connection reliability of the conductive path from the heater to the quick-release interface. This permanent or highly reliable connection method guarantees the stability of basic electrical performance and provides a solid foundation for the upstream quick-release interface function.

[0017] In the heater connection assembly of the aforementioned hot runner system heater, 170 ≥ α ≥ 30. Angles within this range can significantly change the cable routing to achieve spatial optimization, while avoiding problems such as excessive cable bending, stress concentration, or irregular component shape caused by angles that are too small or too large, thus ensuring the practicality of the solution.

[0018] In the heater connection assembly of the aforementioned hot runner system heater, α is 45 degrees. A 45-degree angle achieves a particularly ideal balance in terms of space saving, cable bending radius, ease of mold processing, and structural strength of the assembly.

[0019] In the heater connection assembly of the aforementioned hot runner system heater, the high-temperature resistant insulating shell covers the area of ​​the electrical connector except for the electrical connection inlet, and the electrical connector enters and is detachably fixed to the high-temperature resistant insulating shell through an opening slot formed on the shell. This achieves a simple and efficient assembly method while ensuring a high level of insulation protection. The full-coverage design eliminates the risk of exposed conductive parts to the greatest extent, improving electrical safety.

[0020] In the heater connection assembly of the hot runner system heater described above, the high-temperature resistant insulating shell covers the area of ​​the electrical connector except for the wire connection port; Alternatively, an opening groove for the power supply connector can be formed in the high-temperature resistant insulating shell, and the high-temperature resistant insulating shell is bonded to the power supply connector. This structure provides an alternative and more permanent fixing solution. Bonding achieves a complete seal of the shell, preventing dust and moisture intrusion, and effectively absorbs vibration, making it suitable for harsh environments with higher protection and reliability requirements. In the heater connection assembly of the aforementioned hot runner system heater, the high-temperature resistant insulating shell is made of ceramic or mica. Both materials possess excellent high-temperature resistance, high insulation resistance, good mechanical strength, and chemical stability, ensuring the reliability and durability of the insulating shell under long-term high-temperature operating conditions.

[0021] In the heater connection assembly of the aforementioned hot runner system heater, the included angle formed between the outer surface of the high-temperature resistant insulating shell on the first connection terminal side and the surface on the second connection terminal side is the same as the included angle α. This achieves minimal component encapsulation. The shell shape closely follows the contours of the internal parts, eliminating unnecessary internal cavities, resulting in the most compact final dimensions of the entire connection assembly and further saving installation space.

[0022] The heater electrical connection system of this hot runner system includes four heater connection assemblies for the hot runner system as described in any one of claims 1-17. Two heater connection assemblies are respectively connected to one end pin of the upper surface heater and the lower surface heater of the manifold, and the remaining two heater connection assemblies are respectively connected to the other end pin of the upper surface heater and the lower surface heater of the manifold. The first connection terminals of the two heater connection assemblies on the same side are connected in parallel with the cable via a parallel connection line. Alternatively, the first connection terminals of the two heater connection assemblies on the same side are connected by a bridge wire, and one of the first connection terminals is fixed to the cable.

[0023] The aforementioned structure extends the space-saving advantage of electrical connections to the system level, achieving overall cabling optimization and integration. The parallel connection method allows for neat and orderly management of power lines for multiple heaters, reducing wiring clutter and fully utilizing the space saved by the angled design. The bridging solution eliminates a cable connection point and a separate parallel conductor, reducing not only the number of components and material costs but also the potential risk of failure caused by too many connection points. The bridging cable establishes the shortest direct path between the two first connection terminals, making the current path simpler and more efficient, while further optimizing the compactness of the cabling in the local space.

[0024] Compared with existing technologies, the advantages of this invention are: 1. Compact structure, optimized spatial layout and anti-interference capability, providing key support for designing more compact hot runner systems. 2. Simple operation required, significantly improving maintenance efficiency and reducing equipment downtime. 3. Reliable connection and safe operation, fundamentally eliminating the risk of electric shock and ensuring the safety of operators and equipment. 4. High system integration and simple wiring. 5. Modular design facilitates automated production and assembly, improving product consistency and reducing manufacturing costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure provided by the present invention.

[0026] Figure 2 This invention provides Figure 1 Sectional view along the AA direction.

[0027] Figure 3This invention provides Figure 1 Sectional view along the BB direction.

[0028] Figure 4 This is a schematic diagram of the electrical connection structure of the electrical connector provided by the present invention.

[0029] Figure 5 This is a schematic diagram of the electrical connector structure provided by the present invention.

[0030] Figure 6 This is a top view of the electrical connector provided by the present invention.

[0031] Figure 7 This is a schematic diagram of the insertion space structure provided by the present invention.

[0032] Figure 8 This is a schematic diagram of the connection structure between the third connecting terminal and the second connecting terminal provided by the present invention.

[0033] Figure 9 This is the front view provided by the present invention.

[0034] Figure 10 This is the left view provided by the present invention.

[0035] Figure 11 This is a top view provided by the present invention.

[0036] Figure 12 This is a diagram showing the pin distribution of the heater provided by the present invention.

[0037] Figure 13 This is a bridging structure diagram of the heater connection assembly provided by the present invention.

[0038] Figure 14 This is a parallel structure diagram of the heater connection assembly provided by the present invention.

[0039] In the figure, the components are: 1. Electrical connector; 11. First connecting terminal; 12. Second connecting terminal; 3. Cable; 4. Heater pin; 2. High-temperature resistant insulating shell; 5. Detachable structure; 5. Elastic buckle; 51. Buckle groove; 21. Lug; 52. Groove; 22. Connecting groove; 23. First crimping structure; 61. C-shaped clamp; 7. Male and female quick-release fixing structure; 8. Third connecting terminal; 71. Protrusion; 72. C-shaped clamp; 73. Insertion space; 81. Locking hole; 74. Lever; 24. Lever hole; 9. Deformation bending part; 25. Opening groove; 100. Heater connecting assembly; 200. Diverter plate; 310. Upper surface heater; 320. Lower surface heater; 400. Parallel connection; 500. Detailed Implementation

[0040] like Figure 1-14As shown, the present invention provides a heater connection assembly for a hot runner system, including an electrical connector 1 made of a metal material and a high-temperature resistant insulating shell 2 that at least partially covers the outside of the electrical connector 1.

[0041] The electrical connector 1 has two main functional parts: a first connecting terminal 11 for connecting the external cable 3, and a second connecting terminal 12 for connecting the heater pin 4. A key improvement of this invention is that the axes of the first connecting terminal 11 and the second connecting terminal 12 are not collinear, but are configured to form a specific angle α. This angle α is greater than 0 degrees and less than 180 degrees, preferably ranging from 30 degrees to 170 degrees, and more preferably 45 degrees. This design allows the installation direction of the cable 3 to be flexibly deflected relative to the installation direction of the heater pin 4, thereby significantly optimizing the spatial layout within the mold.

[0042] Regarding the assembly of the high-temperature resistant insulating shell 2, one method is to cover the area of ​​the electrical connector 1 except for the connection inlets of the cable 3 and heater pin 4. The electrical connector 1 slides laterally into the shell 2 through an opening slot 25 and is fixed by a detachable structure 5. Another method is to further fix the shell 2 and the electrical connector 1 with adhesive after assembly. In this application, the electrical connector 1 and the high-temperature resistant insulating shell 2 are fixed by the detachable structure 5. The detachable structure 5 can take various forms, such as any one or more combinations of a snap-fit ​​structure, a wing structure, an inverted snap-fit ​​structure, or a concave-convex structure. As a specific implementation, at least one elastic snap 51 can be provided on the side of the second connecting terminal 12. This elastic snap 51 can be embedded in the corresponding snap-fit ​​slot 21 inside the high-temperature resistant insulating shell 2 during assembly to achieve snap-fit ​​fixation. Alternatively, a lug 52 can be provided on the side of the second connecting terminal 12 to cooperate with a pre-set groove 22 inside the high-temperature resistant insulating shell 2. To facilitate disassembly, a connecting groove 23 can be formed on the high-temperature resistant insulating shell 2. This connecting groove 23 communicates with the latching groove 21, allowing a tool to be inserted to release the elastic latch 51. In this application, each side of the second connecting terminal 12 is provided with an elastic latch 51 and two lugs 52. To further improve installation and maintenance efficiency, quick-release structures can be provided on the first connecting terminal 11 and / or the second connecting terminal 12. For the first connecting terminal 11, its connection to the cable 3 can be achieved through a first crimping structure 61, which includes at least one clamping lug 611 located on the side of the first connecting terminal 11 that can deform under external force to clamp the cable conductor. Alternatively, welding can also be used. In this application, the first connecting terminal 11 is plate-shaped, and each of its two sides has two spaced-apart clamping lugs 611.

[0043] The connection between the second connecting terminal 12 and the heater pin 4 can be achieved through a male-female quick-release fixing structure 7. Specifically, a third connecting terminal 8 can be provided. One end of the third connecting terminal 8 is fixedly connected to the heater pin 4 through a third crimping structure or a third soldering method, and the other end is quickly plugged into and unplugged from the second connecting terminal 12 through a quick-release structure.

[0044] The quick-release fixing structure 7 includes a protrusion 71 disposed on the outer surface of the sheet-shaped second connecting terminal 12, and elastic pressure bodies 72 with a C-shaped cross-section disposed on both sides of the outer surface of the second connecting terminal 12. The protrusion 71 is located between the two elastic pressure bodies 72, thereby forming an insertion space 73 between the outer surface of the second connecting terminal 12 and the C-shaped pressure bodies 72. The end of the third connecting terminal 8 can be inserted into this insertion space 73, and it is provided with a locking hole 81 that mates with the protrusion 71. After being inserted into place, the protrusion 71 is locked into the locking hole 81 to achieve mechanical locking. For easy disassembly, a lever 74 is provided at the inner end of the second connecting terminal 12. Operating the lever 74 can cause the second connecting terminal 12 to produce a slight elastic deformation, thereby driving the protrusion 71 to disengage from the locking hole 81 to achieve unlocking. The lever 74 is S-shaped or Z-shaped. A lever hole 24 is provided at a corresponding position on the high-temperature resistant insulating shell 2 to allow the lever 74 to be operated from the outside.

[0045] To optimize the operating feel, unlocking efficiency, and structural reliability of the lever 74, a deformable bending portion 9 can be provided between the inner end of the first connecting terminal 11 and the inner end of the second connecting terminal 12. The lever 74 can be mounted on this deformable bending portion 9. Furthermore, raised protective wings 91 can be provided on both sides of the deformable bending portion 9, and the width of the deformable bending portion 9 gradually decreases from one end to the other. This gradual design helps with stress distribution and makes bending deformation smoother.

[0046] The high-temperature resistant insulating shell 2 is preferably made of a high-temperature resistant and insulating material such as ceramic or mica. Its shape can be consistent with the included angle α of the internal electrical connector 1, that is, the included angle formed between the outer surface of the shell 2 on the side of the first connecting terminal 11 and the outer surface on the side of the second connecting terminal 12 is the same as angle α, thereby achieving the most compact encapsulation.

[0047] Based on the aforementioned heater connection assemblies, the present invention also provides a heater electrical connection system for a hot runner system. This system includes four heater connection assemblies 100 as described in any of the preceding embodiments. Two of the heater connection assemblies 100 are respectively connected to the two end pins of the upper surface heater 310 of the manifold 200, and the other two are respectively connected to the two end pins of the lower surface heater 320 of the manifold 200.

[0048] For the upper and lower heater connection assemblies 100 located on the same side of the mold (above and below the same side), their first connection terminals 11 need to be electrically connected in parallel. This can be achieved in two ways: such as Figure 14 As shown, the first method is to use a separate parallel cable 400 to connect the two first connection terminals 11 on this side in parallel, and then connect them to the main cable 3; as shown... Figure 13 As shown, the second method involves using a bridge cable 500 to directly connect the two first connection terminals 11 on this side, and then fixing the main cable 3 to either of the first connection terminals 11. Both methods can achieve reliable parallel power supply.

[0049] The principle of assembling and disassembling the electrical connector and the insulating shell in this application is as follows: The electrical connector 1 and the high-temperature resistant insulating shell 2 are non-permanently fixed through a detachable structure 5. During installation, the electrical connector 1 is slid sideways into the shell from the opening slot 25 on the high-temperature resistant insulating shell 2. During this process, an elastic buckle 51 on the side of the second connecting terminal 12 automatically snaps into the corresponding buckle slot 21 inside the shell. At the same time, the two lugs 52 on the side of the second connecting terminal 12 are also simultaneously embedded into the preset grooves 22 inside the shell, achieving multi-point locking and completing the assembly. During disassembly, a slender tool (such as a screwdriver) can be inserted through the specially provided connecting slot 23 on the high-temperature resistant insulating shell 2, pressing the end of the elastic buckle 51 to deform it and disengage it from the buckle slot 21. At the same time, the electrical connector 1 is gently pulled outward to allow the lugs 52 to slide out of the grooves 22, thus removing the electrical connector 1 from the shell 2. In addition, the shell 2 can also be semi-permanently fixed to the electrical connector 1 by adhesive bonding. In this case, disassembly requires breaking the adhesive layer.

[0050] The connection and disassembly of the cable to the first connecting terminal are as follows: The cable 3 is connected to the first connecting terminal 11 using a quick crimping method. The first connecting terminal 11 is plate-shaped, with two spaced-apart lugs 611 on each side. During installation, the conductive core of the cable is placed in the preset position of the first connecting terminal 11, and a special crimping tool is used to simultaneously or sequentially press the four lugs 611 on both sides, causing them to undergo plastic deformation and tightly wrap around the core, thereby achieving a firm electrical connection and mechanical fixation. During disassembly or maintenance, tools are needed to pry open or cut off the deformed lugs 611, ensuring reliability in daily use.

[0051] The connection and disassembly of the heater pins to the second connection terminal are as follows: Installation: First, secure a separate third connection terminal 8 to the heater pin 4 using a crimping method. Then, smoothly push the end of the third connection terminal 8 with the locking hole 81 into the insertion space 73 (located between the outer surface of the second connection terminal 12 and the C-shaped elastic pressure bodies 72 on both sides). When the third connection terminal 8 is in place, the protrusion 71 on the outer surface of the second connection terminal 12 will automatically engage with the locking hole 81 of the third connection terminal 8 under elastic action, accompanied by a clear "click" sound or tactile feedback, indicating that it has been mechanically locked and the electrical circuit is established simultaneously.

[0052] Disassembly: When the heater needs to be replaced, the disconnection operation can be completed using a tool. Using a tool, press the lever 74 through the lever hole 24 on the high-temperature insulating housing 2. This causes a slight displacement of the second connecting terminal 12, forcing the protrusion 71 to disengage from the locking hole 81. At this point, the third connecting terminal 8, along with the heater pin 4, can be easily pulled out of the insertion space 73 of the second connecting terminal 12, achieving quick separation.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A heater connection assembly for a hot runner system, characterized in that, The utility model provides an electric connector (1) comprising a metal material, the electric connector (1) comprises a first connecting terminal (11) and a second connecting terminal (12), the first connecting terminal (11) is used for connecting a cable (3), the second connecting terminal (12) is used for connecting a heater pin (4), and the first connecting terminal (11) and the second connecting terminal (12) form an angle alpha between the axis of the first connecting terminal (11) and the axis of the second connecting terminal (12), alpha is greater than 0 degrees and less than 180 degrees, so that the cable (3) installation direction and the heater pin (4) installation direction of the second connecting terminal (12) are located in the angle interval, and the electric connector (1) is provided with a high-temperature-resistant insulating shell (2) at least partially covered.

2. The heater connection assembly of a hot-duct system heater of claim 1, wherein, The electric connector (1) is fixed with the high-temperature-resistant insulating shell (2) through a detachable structure (5).

3. The heater connection assembly of a hot-duct system heater of claim 2, wherein, The detachable structure (5) comprises any one or more of a buckle structure, a wing structure, an inverted buckle structure or a concave-convex structure.

4. The heater connection assembly of a hot-duct system heater of claim 3, wherein, The second connecting terminal (12) is provided with at least one elastic buckle (51) on the side, the elastic buckle (51) is embedded in a buckle groove (21) in the high-temperature-resistant insulating shell (2); and / or, The second connecting terminal (12) is provided with at least one lug (52) on the side, and the high-temperature-resistant insulating shell (2) is provided with a groove (22) capable of cooperating with the lug (52).

5. The heater connection assembly of a hot-duct system heater of claim 4, wherein, The high-temperature-resistant insulating shell (2) is further provided with a communication groove (23) capable of communicating the buckle groove (21) with the outside.

6. The heater connection assembly of a hot-duct system heater according to any of claims 1-5, wherein, At least one of the first connecting terminal (11) and the second connecting terminal (12) is provided with a quick release structure.

7. The heater connection assembly of a hot-duct system heater of claim 6, wherein, The first connecting terminal (11) is connected with the cable through a first crimping structure (61) or a first welding structure.

8. The heater connection assembly of a hot-duct system heater of claim 6, wherein, The second connecting terminal (12) is connected with one end of a third connecting terminal (8) through a male-female quick release fixing structure (7), and the other end of the third connecting terminal (8) is connected with the heater pin (4).

9. The heater connection assembly of a hot-duct system heater of claim 8, wherein, The male-female quick release fixing structure (7) comprises a convex body (71) arranged on the outer surface of the second connecting terminal (12) in a sheet shape, both sides of the outer surface of the second connecting terminal (12) are provided with a C-shaped pressing body (72), and the convex body (71) is located between the pressing bodies (72), a plug-in space (73) for inserting the third connecting terminal (8) is arranged between the outer surface of the second connecting terminal (12) and the C-shaped pressing body (72), the third connecting terminal (8) is provided with a buckle hole (81) capable of cooperating with the convex body (71), and the inner end of the second connecting terminal (12) is provided with a lever (74) for unlocking the cooperation between the convex body (71) and the buckle hole (81), and the high-temperature-resistant insulating shell (2) is provided with a lever hole (24) for communicating the lever (74) with the outside.

10. The heater connection assembly of a hot-duct system heater of claim 9, wherein, The inner end of the first connecting terminal (11) and the inner end of the second connecting terminal (12) are provided with a deformation bending part (9), and the lever (74) is arranged on the bending part (9).

11. The heater connection assembly of a hot-duct system heater of claim 10, wherein, Both sides of the deformation bending part (9) are provided with raised wings (91), and / or the width of the deformation bending part (9) gradually decreases from one end to the other end.

12. The heater connection assembly of a hot-duct system heater of claim 8, wherein, The third connecting terminal (8) is connected with the heater pin (4) through a third crimping structure or a third welding structure.

13. The heater connection assembly of a hot-duct system heater according to any one of claims 1-5, wherein, 170≥α≥30。 14. The heater connection assembly of a hot-duct system heater of claim 13, wherein, The alpha is 45 degrees.

15. The heater connection assembly of a hot-duct system heater according to any of claims 2-5, wherein, The high-temperature-resistant insulating shell (2) covers the area of the electric connecting piece (1) except the electric connecting port, and the electric connecting piece (1) enters the high-temperature-resistant insulating shell (2) through the opening slot (25) formed on the high-temperature-resistant insulating shell (2) and is detachably fixed.

16. The heater connection assembly of a hot-duct system heater of claim 1, wherein, The high-temperature-resistant insulating shell (2) covers the area of the electric connecting piece (1) except the wire connecting port. Alternatively, the opening slot (25) for the electric connecting piece (1) to enter is formed on the high-temperature-resistant insulating shell (2), and the high-temperature-resistant insulating shell (2) is connected with the electric connecting piece (1) by adhesion.

17. The heater connection assembly of a hot-duct system heater according to any one of claims 1-5, wherein, The high-temperature-resistant insulating shell (2) is made of ceramic or mica.

18. The heater connection assembly of a hot-duct system heater according to any one of claims 1-5, wherein, The high-temperature-resistant insulating shell (2) is located between the outer surface on the side of the first connecting terminal (11) and the surface on the side of the second connecting terminal (12), and the included angle formed between them is the same as the included angle alpha.

19. A heater electrical connection system for a hot runner system, characterized by, The application relates to a heating device for a hot runner system, comprising four heater connecting assemblies (100) as claimed in any one of claims 1-18, two heater connecting assemblies (100) are connected with one end pins of the upper surface heater (310) and the lower surface heater (320) of the flow distribution plate (200) respectively, the remaining two heater connecting assemblies (100) are connected with the other end pins of the upper surface heater (310) and the lower surface heater (320) of the flow distribution plate (200) respectively, the first connecting terminals (11) of the two heater connecting assemblies (100) on the same side are connected with the cable (4) in parallel through the parallel connecting wire (400); Alternatively, the first connecting terminals (11) of the two heater connecting assemblies (100) on the same side are connected through the bridge wire (500), and one of the first connecting terminals (11) is fixed with the cable (3).

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