Threaded hot nozzle, hot runner system and stress control method capable of preventing tooth jam

Abstract

The application provides a thread type hot nozzle, a hot runner system and a stress control method to prevent the hot nozzle from being stuck. The thread type hot nozzle comprises a hot nozzle body and a supporting ring. The upper end of the hot nozzle body is provided with a mounting part for thread connection with a flow distribution plate. The supporting ring is rotatably sleeved on the outside of the hot nozzle body and below the mounting part. The hot nozzle body is provided with a supporting part. The supporting ring is located between the supporting part and the flow distribution plate. The upper surface of the supporting part is provided with a first protruding part in the circumferential direction. The remaining area of the upper surface of the supporting part forms a first empty space. The lower surface of the supporting ring towards the supporting part is provided with a second protruding part in the circumferential direction. The remaining area of the lower surface of the supporting ring forms a second empty space. The supporting ring has a stress state and a force releasing state. In the stress state, the first protruding part and the second protruding part abut against each other. The supporting ring supports the hot nozzle body and the flow distribution plate to be separated along the axial direction and generates an axial tension. In the force releasing state, the first protruding part is embedded in the second empty space, the second protruding part is embedded in the first empty space, and the axial pressure is released.

Description

Technical Field

[0001] This invention relates to the technical field of hot runners, and more specifically, to a threaded hot nozzle that prevents jamming, a hot runner system, and a force control method. Background Technology

[0002] In the field of hot runner mold technology, the hot nozzle and the manifold are typically fixedly connected by a threaded fit. This connection method has the advantages of simple structure, reliable connection, and good sealing performance, and is therefore widely used in integral hot runner systems. During injection molding, molten plastic is distributed by the manifold and flows into each hot nozzle, which then injects the molten plastic into the mold cavity. As a key connecting component between the manifold and the mold, the reliability of the hot nozzle connection directly affects the operational stability of the entire hot runner system.

[0003] However, existing threaded hot runners generally suffer from the following problems in practical use: During injection molding, the hot runner is exposed to a high-temperature environment of 200℃ to 400℃ for extended periods and continuously withstands the axial impact loads generated by high-speed, high-pressure injection. Because the connecting threads between the hot runner and the manifold must simultaneously fulfill both the mechanical locking function and the system's load-bearing function, the axial force, thermal expansion force, and injection pressure of the entire system are concentrated on the threaded connection area. Under the combined effects of long-term high temperature, high pressure, and alternating loads, the thread surface is prone to creep deformation and microscopic damage. When the hot runner needs to be removed for maintenance, the deformed threads seize up, preventing the hot runner from being properly turned and disassembled, resulting in a jammed thread problem.

[0004] The occurrence of thread jamming not only forces maintenance personnel to use destructive methods for disassembly, increasing the difficulty and time cost of maintenance, but may also damage the threads of hot runners or manifolds, resulting in expensive spare parts replacement costs. At the same time, the extended maintenance time directly affects production delivery schedules, causing significant economic losses to both equipment users and hot runner system suppliers. Summary of the Invention

[0005] The purpose of this invention is to provide a threaded hot nozzle, a hot runner system, and a force control method to prevent thread jamming, thereby solving the technical problem in the prior art where threaded hot nozzles are prone to jamming and difficult disassembly due to thread deformation under high temperature and high pressure conditions.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a threaded hot nozzle that prevents thread jamming, comprising: The hot nozzle body has a mounting part at its upper end for threaded connection with the distributor plate; A support ring, which is rotatably fitted onto the outside of the hot nozzle body and located below the mounting portion; The hot nozzle body is provided with a support portion, and the support ring is located between the support portion and the flow divider plate; The upper surface of the support part is provided with a first protrusion along the circumferential direction, and the remaining area of ​​the upper surface of the support part forms a first clearance. The support ring has a second protrusion along the circumferential direction on the lower surface facing the support part, and the remaining area of ​​the lower surface of the support ring forms a second clearance. The support ring has a stressed state and a stress-relieving state: Under the stress state, the first protrusion abuts against the second protrusion, and the support ring axially expands the hot nozzle body and the flow divider plate and generates axial tension. In the unloading state, the first protrusion is engaged with the second clearance position, and the second protrusion is engaged with the first clearance position, thus releasing the axial pressure.

[0007] According to the threaded hot nozzle for preventing tooth jamming described above, the first protrusion surrounds the outside of the hot nozzle body and is fixedly connected to the hot nozzle body. The first protrusion has a polygonal structure, and the sharp corners of the polygonal structure extend to the outer peripheral edge of the support. The area between two adjacent sharp corners forms the first clearance position. The number of the first clearance positions is equal to the number of sides of the polygonal structure.

[0008] According to the threaded hot nozzle for preventing tooth jamming described above, the support ring has a second protrusion on its lower surface facing the support portion, which corresponds to the number of the first clearance positions, and the second protrusion is located on the outer peripheral edge of the support ring, and the remaining area of ​​the lower surface of the support ring forms the second clearance position.

[0009] According to the threaded hot nozzle for preventing tooth jamming described above, the size of the second protrusion is smaller than the size of the first clearance, and the size of the second clearance is larger than the size of the first protrusion.

[0010] According to the threaded hot nozzle for preventing tooth jamming described above, the first protrusion is provided with a first guide portion; And / or, the second protrusion is provided with a second guide portion.

[0011] According to the threaded hot nozzle for preventing tooth jamming described above, the difference between the height of the first protrusion and the depth of the first clearance is 0.2mm~0.5mm. And / or, the difference between the height of the second protrusion and the depth of the second clearance is 0.2mm~0.5mm.

[0012] According to the threaded hot nozzle for preventing tooth jamming described above, the outer peripheral wall of the support ring is provided with a wrench position.

[0013] According to the threaded hot nozzle for preventing tooth jamming described above, the mounting part is provided with an external thread, the distributor plate is provided with a mounting hole, the mounting hole is provided with an internal thread, the mounting part is installed in the mounting hole, and the internal thread and the external thread are threadedly connected.

[0014] Secondly, the present invention also provides a hot runner system, including the threaded hot nozzle with anti-jamming as described above, and a manifold plate, wherein the manifold plate is threadedly connected to the mounting portion of the hot nozzle body.

[0015] Thirdly, the present invention also provides a force control method for an anti-jamming threaded hot nozzle, applied to the aforementioned anti-jamming threaded hot nozzle, comprising the following steps: The hot nozzle body is threadedly connected to and locked to the distributor plate via the mounting part, so that the support ring, which is rotatably sleeved on the outside of the hot nozzle body, is located between the support part of the hot nozzle body and the distributor plate. Rotating the support ring switches the convex-concave fit structure between the support ring and the support part from the unloading state to the loading state. The support ring is axially lifted and axial tension is generated between the hot nozzle body and the flow divider plate, transferring the injection load from the mounting part to the support ring. When disassembly is required, rotate the support ring to switch the convex-concave mating structure from the stressed state to the unstressed state, and the axial tension is released. In the unloaded state, the mounting part is unscrewed from the distributor plate.

[0016] The beneficial effects of the threaded hot nozzle, hot runner system, and force control method for preventing tooth jamming provided by this invention are at least as follows: The threaded hot runner provided by this invention achieves active management of thread stress by switching between the stressed and unstressed states of the support ring. During operation, the load is transferred to the support ring to protect the thread, which is no longer under working load. This prevents creep deformation and microscopic damage, significantly extending its service life. When disassembly is required, simply rotating the support ring relieves the stress, allowing operation to be performed in an unstressed state before each hot runner removal. The thread is relaxed, protecting it from damage by disassembly torque, and the manifold can be easily detached, thus completely solving the problem of threaded hot runner jamming. As an independent component, the support ring can be replaced separately even if worn or deformed, reducing maintenance costs and shortening repair time from several hours in traditional solutions to tens of minutes. This significantly reduces repair difficulty and time costs, avoiding production delivery issues caused by repair delays. This embodiment only requires the addition of a support ring component, making minimal changes to the existing hot runner structure, low cost, and easy to modify and promote on existing hot runner systems, demonstrating good industrial applicability and economic benefits. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the hot runner system provided by the present invention; Figure 2 An exploded structural diagram of the threaded hot nozzle for preventing tooth jamming provided by the present invention; Figure 3 This is a schematic diagram of the exploded structure of the hot runner system provided by the present invention under stress. Figure 4 This is a schematic diagram of the exploded structure of the hot runner system provided by the present invention under stress relief conditions; Figure 5 for Figure 3 A magnified structural diagram of part A in the middle; Figure 6 This is a schematic diagram of the force state. Figure 7 for Figure 4 A magnified structural diagram of part B in the middle section; Figure 8 This is a schematic diagram of the unloading state; Figure 9 Flowchart of the force control method for threaded hot nozzles to prevent jamming.

[0019] The following are the labeling elements in the figure: 1. Hot runner system; 10. Anti-jamming threaded hot nozzle; 100. Hot nozzle body; 110. Mounting part; 120. Support part; 121. First protrusion; 122. First clearance position; 200. Support ring; 210. Inner hole; 220. Second protrusion; 230. Second clearance position; 240. Wrench position; 20. Diverter plate. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0022] Please see Figure 1 and Figure 2 This embodiment provides a threaded hot nozzle 10 that prevents tooth jamming, including a hot nozzle body 100 and a support ring 200.

[0023] The hot nozzle body 100 has a mounting portion 110 at its upper end for threaded connection with the manifold 20. Specifically, the mounting portion 110 has an external thread, the manifold 20 has a mounting hole with an internal thread, and the mounting portion 110 is installed in the mounting hole, with the internal thread and the external thread forming a threaded connection. The cooperation between the external and internal threads achieves a reliable connection between the hot nozzle body 100 and the manifold 20, resulting in high connection strength and good sealing, meeting the high-temperature and high-pressure operating requirements during injection molding.

[0024] The support ring 200 has an inner hole 210. The support ring 200 is rotatably fitted onto the outside of the hot nozzle body 100 and located below the mounting portion 110. Optionally, the inner hole 210 of the support ring 200 is clearance-fitted with the outer wall of the hot nozzle body 100, with a clearance typically between 0.02mm and 0.1mm, ensuring smooth rotation of the support ring 200. The hot nozzle body 100 is provided with a support portion 120, and the support ring 200 is located between the support portion 120 and the flow divider plate 20.

[0025] The upper surface of the support portion 120 is provided with a first protrusion 121 along the circumferential direction, and the remaining area of ​​the upper surface of the support portion 120 forms a first clearance position 122; the lower surface of the support ring 200 facing the support portion 120 is provided with a second protrusion 220 along the circumferential direction, and the remaining area of ​​the lower surface of the support ring 200 forms a second clearance position 230.

[0026] Please see Figures 3 to 8The support ring 200 has a stressed state and a stressed state: in the stressed state, the first protrusion 121 abuts against the second protrusion 220, and the support ring 200 axially expands the hot nozzle body 100 and the diverter plate 20 and generates axial tension; in the stressed state, the first protrusion 121 is embedded in the second clearance position 230, the second protrusion 220 is embedded in the first clearance position 122, and the axial pressure is released.

[0027] The working principle of the anti-jamming threaded hot nozzle 10 provided in this embodiment is as follows: The threaded hot nozzle 10 provided in this embodiment is characterized by actively switching the thread force state by rotating the support ring 200. During installation, the hot nozzle body 100 is screwed into the manifold 20 through the mounting part 110 and locked, so that the support ring 200 is located between the support part 120 of the hot nozzle body 100 and the manifold 20. During injection molding, for example, the support ring 200 can be rotated forward, so that the second protrusion 220 on the lower surface of the support ring 200 abuts against the first protrusion 121 on the upper surface of the support part 120 of the hot nozzle body 100. The support ring 200 is axially lifted, generating axial tension between the hot nozzle body 100 and the manifold 20. The tension generates the working load generated during injection molding from the threaded connection to the end face contact surface of the support ring 200, the manifold 20, and the support part 120. This allows the thread to only bear the minimum locking force required to maintain the connection, without bearing high-pressure impact loads and thermal expansion forces, effectively preventing creep deformation of the thread under high-temperature and high-pressure conditions. When disassembly and maintenance are required, the support ring 200 can be rotated in the reverse or forward direction to make the first protrusion 121 engage with the second clearance 230 and the second protrusion 220 engage with the first clearance 122. The axial tension of the support ring 200 is completely released, and the preload and working stress on the thread are greatly reduced. The normal pressure and friction between the thread pairs are significantly reduced. At this time, the hot nozzle can be easily unscrewed with normal torque to achieve non-damaging disassembly.

[0028] The beneficial effects of the threaded hot nozzle 10 for preventing tooth jamming provided in this embodiment are as follows: The threaded hot nozzle 10 provided in this embodiment achieves active management of thread stress by switching between the stressed and unstressed states of the support ring 200. During operation, the load is transferred to the support ring 200 to protect the thread, which is no longer under working load. This prevents creep deformation and microscopic damage, significantly extending its service life. When disassembly is required, simply rotating the support ring 200 releases the stress, allowing operation to be performed in an unstressed state before each hot nozzle removal. With the thread relaxed, it is protected from damage by disassembly torque, and the distributor plate can be easily twisted off, thus completely solving the problem of threaded hot nozzle jamming. As an independent component, the support ring 200 can be replaced individually even if worn or deformed, reducing maintenance costs. Furthermore, repair time is reduced from several hours in traditional solutions to tens of minutes, significantly reducing repair difficulty and time costs, and avoiding production delivery issues caused by repair delays. This embodiment only requires the addition of a support ring 200 part, which makes minimal changes to the existing hot runner structure, is low in cost, and is easy to modify and promote on the existing hot runner system 1, with good industrial applicability and economic benefits.

[0029] In one embodiment, see Figure 2 The first protrusion 121 surrounds the outside of the hot nozzle body 100 and is fixedly connected to the hot nozzle body 100. It can be welded or integrally formed. The first protrusion 121 has a polygonal structure. The sharp corners of the polygonal structure extend to the outer peripheral edge of the support 120. The area between two adjacent sharp corners forms the first clearance position 122. The number of the first clearance positions 122 is equal to the number of sides of the polygonal structure.

[0030] The support ring 200 has a second protrusion 220 on its lower surface facing the support portion 120, which corresponds to the number of the first clearance positions 122. The second protrusion 220 is located on the outer peripheral edge of the support ring 200, and the remaining area of ​​the lower surface of the support ring 200 forms a second clearance position 230.

[0031] Please refer to the following: Figures 3 to 8 When rotated to the stressed state, the multiple second protrusions 220 of the support ring 200 abut against each of the sharp corners of the polygonal first protrusion 121, causing the support ring 200 to be axially lifted, generating axial tension between the hot nozzle body 100 and the flow divider 20. When rotated to the unstressed state, the multiple second protrusions 220 engage with the multiple first clearance positions 122, while the polygonal first protrusion 121 engages with the second clearance position 230, and the axial tension of the support ring 200 is completely released. It should be understood that the support ring 200 can rotate clockwise or counterclockwise, and can rotate 360°, but as long as the support ring 200 rotates 30° to 60°, the switching between the stressed state and the unstressed state can be achieved.

[0032] Through the multi-point abutment of the first protrusion 121 and the second protrusion 220, the support ring 200 is uniformly lifted by force, ensuring the balanced distribution of axial tension in the circumferential direction, thereby improving the stability and reliability of the stress state. At the same time, the one-to-one corresponding insertion of multiple protrusions into the clearance positions ensures that each component is fully positioned under the unloaded state, allowing the thread stress to be fully released and making disassembly smoother.

[0033] In one embodiment, the size of the second protrusion 220 is smaller than the size of the first clearance 122, and the size of the second clearance 230 is larger than the size of the first protrusion 121. This ensures that the first protrusion 121 and the second protrusion 220 can be fully embedded in the corresponding first clearance 122 and second clearance 230 without interference under the unloading state, so that the axial thickness of the support ring 200 can be truly reduced and the axial tension can be completely released.

[0034] In one embodiment, see Figure 6 and Figure 8 The first protrusion 121 forms a hexagonal structure, the number of the first clearance positions 122 is six, the number of the second protrusions 220 is six, and the support ring 200 can switch between the stressed state and the unstressed state by rotating 30°.

[0035] It is understood that the hexagonal structure of the first protrusion 121 in the above embodiments is merely illustrative and does not constitute a limitation of the present invention. In other embodiments, the first protrusion 121 may also adopt other polygonal configurations such as pentagons and octagons, as long as its sharp corners can form a stable abutting fit with the second protrusion 220 and the clearance between adjacent sharp corners can accommodate the second protrusion 220. Similarly, the specific number and arrangement of the first protrusion 121, the first clearance 122, the second protrusion 220 and the second clearance 230 can also be flexibly adjusted. As long as the support ring 200 is axially lifted by the abutment between the first protrusion 121 and the second protrusion 220, and axial tension is generated between the hot nozzle body 100 and the diverter plate 20, the purpose of the present invention can be achieved, and all of these fall within the protection scope of the present invention.

[0036] In one embodiment, the first protrusion 121 is provided with a first guide portion (not shown in the figure, the same below); and / or, the second protrusion 220 is provided with a second guide portion (not shown in the figure, the same below). The provision of the first guide portion and the second guide portion allows the support ring 200 to guide the movement direction of the protrusion into the clearance position during rotation, enabling the protrusion to smoothly slide into the clearance position and avoid jamming due to positional deviation. Optionally, the first guide portion is an inclined surface, and / or, the second guide portion is an inclined surface.

[0037] In one embodiment, the difference between the height of the first protrusion 121 and the depth of the first clearance 122 is 0.2mm to 0.5mm; and / or, the difference between the height of the second protrusion 220 and the depth of the second clearance 230 is 0.2mm to 0.5mm.

[0038] The difference ensures that, under stress, the first protrusion 121 and the second protrusion 220 can fully abut against each other, generating sufficient but not excessive axial tension. Under stress relief, when the first protrusion 121 falls into the second clearance position 230 and the second protrusion 220 falls into the first clearance position 122, the difference ensures that the first protrusion 121 can be fully embedded in the second clearance position 230 and the second protrusion 220 can be fully embedded in the first clearance position 122, thereby significantly reducing the axial thickness of the support ring 200 and completely releasing the tension.

[0039] In one embodiment, see Figure 2 The outer peripheral wall of the support ring 200 is provided with a wrench position 240, which is used to cooperate with tools such as wrenches to apply rotational torque to the support ring 200, overcoming the frictional resistance between the support ring 200 and the hot nozzle body 100, thereby driving the support ring 200 to switch between a stressed state and a de-stressed state around the hot nozzle body 100. The wrench position 240 provides the operator with a clear position for applying force, making the state switching operation of the support ring 200 more convenient and labor-saving.

[0040] In one embodiment, the wrench position 240 has a hexagonal outer peripheral surface. The use of a hexagonal outer peripheral surface for the wrench position 240 in the above embodiments is merely illustrative and does not constitute a limitation of the present invention. In other embodiments, the wrench position 240 may also take the form of a quadrilateral outer peripheral surface, an octagonal outer peripheral surface, a flat structure, an oblong structure, or a groove or hole formed on the outer peripheral wall, as long as it allows a tool to be clamped or inserted to apply rotational torque.

[0041] This embodiment also provides a hot runner system 1, including the aforementioned anti-jamming threaded hot nozzle 10, and a manifold 20. The manifold 20 is threadedly connected to the mounting portion 110 of the hot nozzle body 100. The mounting portion 110 has an external thread, and the manifold 20 has a mounting hole with an internal thread. The mounting portion 110 is installed in the mounting hole, and the internal thread and the external thread are threadedly connected. Since the structure of the anti-jamming threaded hot nozzle 10 has already been described above, it will not be repeated here.

[0042] Please see Figure 9 This embodiment also provides a method for installing and removing the threaded hot nozzle 10 to prevent tooth jamming, including the following steps: S100: The hot nozzle body 100 is threadedly connected to the flow divider plate 20 through the mounting part 110 at its upper end and locked, so that the support ring 200, which is rotatably sleeved on the outside of the hot nozzle body 100, is located between the support part 120 of the hot nozzle body 100 and the flow divider plate 20. S200: Rotate the support ring 200 in the forward direction, so that the convex and concave fit structure between the support ring 200 and the support part 120 switches from the unloading state to the loading state. The support ring 200 is axially lifted and axial tension is generated between the hot nozzle body 100 and the flow divider 20, transferring the injection load from the mounting part 110 to the support ring 200.

[0043] Specifically, when the convex-concave mating structure is in the stressed state, the second protrusion 220 on the support ring 200 abuts against the first protrusion 121 on the support portion 120.

[0044] S300: When disassembly is required, rotate the support ring 200 in the reverse or forward direction to switch the convex-concave mating structure from the stressed state to the unstressed state, and release the axial tension.

[0045] Specifically, when the convex-concave mating structure is in the stress-relieving state, the second protrusion 220 on the support ring 200 is embedded in the first clearance position 122 on the support part 120, and the first protrusion 121 is embedded in the second clearance position 230 on the support ring 200.

[0046] S400: In the unloading state, the mounting part 110 is unscrewed from the diverter plate 20.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A threaded hot nozzle for preventing tooth jamming, characterized in that, include: The hot nozzle body has a mounting part at its upper end for threaded connection with the distributor plate; A support ring, which is rotatably fitted onto the outside of the hot nozzle body and located below the mounting portion; The hot nozzle body is provided with a support portion, and the support ring is located between the support portion and the flow divider plate; The upper surface of the support part is provided with a first protrusion along the circumferential direction, and the remaining area of ​​the upper surface of the support part forms a first clearance. The support ring has a second protrusion along the circumferential direction on the lower surface facing the support part, and the remaining area of ​​the lower surface of the support ring forms a second clearance. The support ring has a stressed state and a stress-relieving state: Under the stress state, the first protrusion abuts against the second protrusion, and the support ring axially expands the hot nozzle body and the flow divider plate and generates axial tension. In the unloading state, the first protrusion is engaged with the second clearance position, and the second protrusion is engaged with the first clearance position, thus releasing the axial pressure.

2. The threaded hot nozzle for preventing tooth jamming according to claim 1, characterized in that, The first protrusion surrounds the outside of the hot nozzle body and is fixedly connected to the hot nozzle body. The first protrusion has a polygonal structure, and the sharp corners of the polygonal structure extend to the outer peripheral edge of the support. The area between two adjacent sharp corners forms the first clearance position. The number of the first clearance positions is equal to the number of sides of the polygonal structure.

3. The threaded hot nozzle for preventing tooth jamming according to claim 2, characterized in that, The support ring has a second protrusion on its lower surface facing the support portion, which corresponds to the number of the first clearance positions. The second protrusion is located on the outer peripheral edge of the support ring, and the remaining area of ​​the lower surface of the support ring forms the second clearance position.

4. The threaded hot nozzle for preventing tooth jamming according to claim 3, characterized in that, The size of the second protrusion is smaller than the size of the first clearance, and the size of the second clearance is larger than the size of the first protrusion.

5. The threaded hot nozzle for preventing tooth jamming according to claim 1, characterized in that, The first protrusion is provided with a first guide portion; And / or, the second protrusion is provided with a second guide portion.

6. The threaded hot nozzle for preventing tooth jamming according to claim 1, characterized in that, The difference between the height of the first protrusion and the depth of the first clearance is 0.2mm~0.5mm; And / or, the difference between the height of the second protrusion and the depth of the second clearance is 0.2mm~0.5mm.

7. The threaded hot nozzle for preventing tooth jamming according to claim 1, characterized in that, The outer peripheral wall of the support ring is provided with a wrench position.

8. The threaded hot nozzle for preventing tooth jamming according to claim 1, characterized in that, The mounting part is provided with an external thread, the distributor plate is provided with a mounting hole, the mounting hole is provided with an internal thread, the mounting part is installed in the mounting hole, and the internal thread and the external thread are threadedly connected.

9. A hot runner system, characterized in that, The threaded hot nozzle, which includes the anti-jamming type according to any one of claims 1 to 8, further includes a flow divider plate, wherein the flow divider plate is threadedly connected to the mounting part of the hot nozzle body.

10. A method for controlling the force of a threaded hot nozzle to prevent tooth jamming, characterized in that, The threaded hot nozzle used in any one of claims 1 to 8 for preventing tooth jamming comprises the following steps: The hot nozzle body is threadedly connected to and locked to the distributor plate via the mounting part, so that the support ring, which is rotatably sleeved on the outside of the hot nozzle body, is located between the support part of the hot nozzle body and the distributor plate. Rotating the support ring switches the convex-concave fit structure between the support ring and the support part from the unloading state to the loading state. The support ring is axially lifted and axial tension is generated between the hot nozzle body and the flow divider plate, transferring the injection load from the mounting part to the support ring. When disassembly is required, rotate the support ring to switch the convex-concave mating structure from the stressed state to the unstressed state, and the axial tension is released. In the unloaded state, the mounting part is unscrewed from the distributor plate.

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