Split hot runner mold structure and injection control method thereof

Abstract

This invention relates to the field of mold technology and discloses a split-type hot runner mold structure and its injection control method. The structure includes a manifold, multiple hot nozzles, and a flow channel formed inside the manifold. The hot nozzles are detachably installed at the lower edge of the manifold, and their upper ends communicate with the flow channel. A flow divider is provided at the lower edge of the manifold for injecting cleaning agent into the hot nozzles. The flow divider includes multiple electrically controlled valves (first and second) evenly arranged at the inner edge of the manifold. A protective component, through a double-layer retractable structure and staggered baffles, effectively blocks high-temperature material splashing during replacement, ensuring safety and saving materials. The "three-way" structure of the flow divider allows for cleaning agent injection without stopping the machine, accelerating material replacement efficiency. The flared part expands the opening to improve cleaning thoroughness, and the resetting operation is simple, significantly improving production continuity and mold maintenance convenience.

Description

Technical Field

[0001] This invention relates to the field of molds, and more specifically, to a split-type hot runner mold structure and its injection molding control method. Background Technology

[0002] Split-type hot runner molds are an important type of hot runner injection molds. Their core design concept is to adopt a "separable and modular" design for the key functional modules of the hot runner system (such as hot nozzles, runner plates, temperature control components, gate mechanisms, etc.), rather than the "integrated" structure of traditional one-piece hot runners.

[0003] In the use of split-type hot runner molds, the hot nozzle is the part where material is directly injected. Due to the small flow channel of the hot nozzle, the heat loss at the tip is relatively fast when in contact with the mold, causing the material to partially cool at the tip, forming cold slug spots that block the flow channel. This causes partial blockage inside the hot nozzle. In addition, residual molten material inside the injection nozzle or manifold of the injection molding machine will carbonize under prolonged high temperature. The carbonized material enters the hot nozzle with the material, which will also cause partial blockage of the flow channel inside the hot nozzle, i.e., incomplete blockage. This incomplete blockage will cause uneven flow rate and flow of molten material, and the mold cavity cannot be evenly filled during injection, resulting in problems such as material shortage, shrinkage cavities, and air bubbles. In order to solve this blockage problem, the existing technology generally adopts the method of disassembly and replacement. After incomplete blockage occurs in the hot nozzle, the hot nozzle is removed from the hot runner mold and replaced to solve the blockage problem. Since there is molten material in the hot nozzle, direct disassembly will cause molten material to overflow or leak from the disassembly point. Because the molten material is at a high temperature, the overflow of molten material during disassembly may cause burns to the disassembly personnel. Summary of the Invention

[0004] This invention provides a split-type hot runner mold structure and its injection control method, which solves the technical problem in related technologies where direct disassembly after incomplete blockage of the hot nozzle can cause molten material to overflow or leak from the disassembly point, resulting in burns to the disassembly workers.

[0005] This invention provides a split-type hot runner mold structure, including a manifold, multiple hot nozzles, and a flow channel formed inside the manifold. The hot nozzles are detachably installed at the lower edge of the manifold, and the upper ends of the hot nozzles are connected to the flow channel. A flow divider is provided at the lower edge of the manifold for injecting cleaning agent into the hot nozzles. The flow divider includes multiple electrically controlled valves 1 and 2 evenly arranged at the inner edge of the manifold. Multiple valve nozzles are evenly distributed at the outer edge of the manifold, and the electrically controlled valves 2 are installed at the end of the valve nozzles close to the electrically controlled valves 1.

[0006] In a preferred embodiment, the space formed by the valve nozzle, the first electrically controlled valve, and the second electrically controlled valve constitutes a three-way structure that can be opened and closed.

[0007] In a preferred embodiment, the device further includes a flaring component installed at the lower end of the hot nozzle. The flaring component includes a plurality of evenly distributed flaring plates rotatably connected to the lower end of the hot nozzle. A positioning block is provided at the lower part of the flaring plate, and a positioning clamp is provided at the lower part of the hot nozzle. The positioning clamp is sleeved on the outer wall of the plurality of positioning blocks.

[0008] In a preferred embodiment, a limiting clamp is installed on the outside of the plurality of positioning blocks, one end of the limiting clamp is rotatably connected to a rotating rod, and the other end is threaded to the left end of the rotating rod.

[0009] In a preferred embodiment, a protective element is further included, the protective element being disposed on the outer periphery of the hot nozzle, the protective element including an inner sheath disposed on the outer wall of the hot nozzle, and the outer wall of the inner sheath being provided with a retractable outer sheath.

[0010] In a preferred embodiment, the outer sheath includes a first sleeve that slides on the outer wall of the inner sheath. The lower end of the first sleeve is provided with a corrugated pipe, and the lower end of the corrugated pipe is provided with a second sleeve. The inner wall of the second sleeve is provided with a blocking element for blocking materials.

[0011] In a preferred embodiment, the blocking member includes a rotating shaft rotatably connected to the left and right sides inside the second protective sleeve, a baffle is provided in the middle of the rotating shaft, a torsion spring is provided at the front end of the rotating shaft, and the end of the torsion spring away from the rotating shaft is provided on the inner wall of the second protective sleeve.

[0012] In a preferred embodiment, the inner sheath is provided with a matching structure on the side near the baffle.

[0013] In a preferred embodiment, the two baffles are positioned on the left and right sides respectively, and the installation heights of the two baffles are staggered. The lower arc of the baffle is consistent with the circular arc with the same inner diameter as the second inner diameter of the protective cylinder.

[0014] A method for injection control of a split-type hot runner mold, comprising the following steps: Step 1: Assemble the core components, connect the electrical and cooling water circuits, and complete the leakage and electrical preheating verification; Step 2: Hoist the mold to the injection molding machine for positioning and fixation, connect the water system, electrical system and barrel nozzle, and complete the mold closing test run and runner preheating and insulation; Step 3: Power on the machine for trial injection and optimize parameters, start automatic mass production and conduct regular spot checks on products; Step 4: Stop the injection molding process and start the hot nozzle replacement process without stopping the machine; Step 5: Cooling and cleaning materials in the flow channel; Step Six: Disconnect the water, electrical, and nozzle connections. After loosening the pressure plate, remove the mold from the injection molding machine and place it on the support. Step 7: Disassemble the core components, inspect and clean them, apply anti-rust oil, and store them in a dry and ventilated place.

[0015] The beneficial effects of this invention are as follows: 1. This invention constructs a double-layer protective structure by setting a protective component on the outer wall of the hot nozzle. The retractable outer sleeve, combined with the interlaced baffle driven by the torsion spring, can quickly unfold and expand the closed area during hot nozzle replacement, effectively blocking the splashing of residual high-temperature molten material inside. At the same time, the bendable outer sleeve can also play a certain role in guiding the flow, controlling the outflow direction of the material and avoiding impact on production activities. This not only avoids material waste and prevents splashed material from damaging other parts of the mold, but also eliminates the safety hazards faced by operators, significantly improving the safety and reliability of the hot nozzle replacement process. 2. By adopting a "three-way" structure consisting of a valve nozzle, an electric control valve one, and an electric control valve two, the present invention can inject cleaning agent into the hot nozzle that needs to be replaced without interrupting the overall production process. The cleaning agent can promote the smooth discharge of residual materials in the hot nozzle, which greatly shortens the hot nozzle replacement time. 3. This invention utilizes a flared part at the lower end of the hot nozzle, which, through multiple rotatable expansion plates and a positioning structure, automatically expands the opening under the pressure of the cleaning agent. This increases the flow channel between the material and the cleaning agent, making it easier to push out residual material and blockages, thus improving the thoroughness of cleaning. At the same time, the combination design of the limiting clamp and the rotating rod allows for quick tightening and loosening of the expansion plates, simplifying the reset operation after cleaning and reducing the labor intensity and efficiency of daily mold maintenance. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the flow divider of the present invention; Figure 3 This is a schematic diagram of the heating nozzle of the present invention; Figure 4 This is a schematic diagram of the flow channel structure of the present invention; Figure 5 This is a schematic diagram of the outer sheath structure of the present invention; Figure 6 This is a schematic diagram of the bellows structure of the present invention; Figure 7 This is a schematic diagram of the baffle structure of the present invention; Figure 8 This is a schematic diagram of the rotating rod structure of the present invention.

[0017] In the diagram: 1. Diverter plate; 11. Flow channel; 12. Hot nozzle; 2. Diverter component; 21. Valve nozzle; 22. Solenoid valve one; 23. Solenoid valve two; 3. Protective component; 31. Inner sheath; 32. Outer sheath; 321. Protective sleeve one; 322. Bellows; 323. Protective sleeve two; 33. Blocking component; 331. Rotating shaft; 332. Baffle; 333. Torsion spring; 4. Flaring component; 41. Expanding plate; 42. Positioning block; 43. Positioning clamp; 431. Limiting clamp; 432. Rotating rod. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1-4 As shown, a split-type hot runner mold structure includes a manifold 1, multiple hot nozzles 12, and a flow channel 11 formed inside the manifold 1. The hot nozzles 12 are detachably installed at the lower edge of the manifold 1, and the upper end of the hot nozzles 12 is connected to the flow channel 11. A manifold component 2 for injecting cleaning agent into the interior of the hot nozzles 12 is provided at the lower edge of the manifold 1. The manifold component 2 includes multiple electrically controlled valves 22 and 23 evenly arranged at the inner edge of the manifold 1. Multiple valve nozzles 21 are evenly distributed at the outer edge of the manifold 1. The electrically controlled valves 23 are installed at the end of the valve nozzles 21 near the electrically controlled valves 22.

[0020] Specifically, the flow channel 11 is a channel inside the flow divider plate 1 that allows molten material to flow. A hot nozzle 12 is installed at its lower outlet. The detachable connection between the hot nozzle 12 and the flow divider plate 1 includes, but is not limited to, threaded connection and snap-fit ​​connection. In this embodiment, the preferred detachable connection is a threaded connection. The upper part of the hot nozzle 12 has a threaded opening, allowing the hot nozzle 12 to be rotated and installed on the lower part of the flow divider plate 1 using a tool, thus forming a connected channel between the hot nozzle 12 and the flow channel 11. Both the first electric control valve 22 and the second electric control valve 23 are located at the lower part of the flow channel 11. The space formed by the valve nozzle 21, the first electric control valve 22, and the second electric control valve 23 constitutes an openable and closable "three-way" structure. The first electric control valve 22 and the second electric control valve 23 are currently... There is technology that allows opening and closing after power is applied. The valve nozzle 21 is located on the outer wall of the flow divider plate 1 and is connected to the flow channel 11. The valve nozzle 21 is a prior art technology that can be used with a compatible output port. When inserted, the interior of the valve nozzle 21 and the flow channel 11 can be interconnected, allowing the cleaning agent to enter the interior of the flow channel 11 from the valve nozzle 21. Cleaning the mold with the cleaning agent is a prior art technology, and the cleaning agent is mostly composed of modified resin. Therefore, after the hot nozzle 12 is disassembled, the cleaning agent flowing out will not cause harm to the human body. The operating sequence of the valve nozzle 21, the first electric control valve 22, and the second electric control valve 23 is as follows: the first electric control valve 22 is closed, the second electric control valve 23 is opened, thereby sealing the flow channel 11 above the first electric control valve 22 and allowing the cleaning agent to flow in. After cleaning is completed, the second electric control valve 23 is closed.

[0021] During the injection molding process, the hot nozzle 12 needs to be replaced due to blockage. In order to replace the hot nozzle 12 without stopping the machine, the first solenoid valve 22 can be closed and the second solenoid valve 23 can be opened. The valve nozzle 21 is connected to the cleaning agent outlet. The cleaning agent is introduced into the lower part of the first solenoid valve 22 through the valve nozzle 21. The cleaning agent moves downward along the flow channel 11. Under the pressure of the cleaning agent, the material between the hot nozzle 12 and the upper part of it and the first solenoid valve 22 can be squeezed out. After cleaning is completed, the second solenoid valve 23 is closed, and the cleaning agent outlet is sprayed out from the inside of the valve nozzle 21.

[0022] In the above embodiments, such as Figure 6 As shown, because the lower channel of the hot nozzle 12 is small and narrow, it is easy to get clogged. When the cleaning agent is introduced into it to push the material out, the blocked hot nozzle 12 will block the flow of material and cleaning agent, which directly reduces the discharge speed of cleaning agent and material. Therefore, in order to solve this technical problem, this embodiment also includes a flaring member 4. The flaring member 4 is installed at the lower end of the hot nozzle 12. The flaring member 4 includes a plurality of evenly distributed flaring plates 41 rotatably connected to the lower end of the hot nozzle 12. The lower part of the flaring plate 41 is provided with a positioning block 42, and the lower part of the hot nozzle 12 is provided with a positioning clamp 43. The positioning clamp 43 is sleeved on the outer wall of the plurality of positioning blocks 42.

[0023] Specifically, the lower end of the hot nozzle 12 is divided into six interlocking expansion plates 41. When multiple expansion plates 41 rotate and mesh together, they can form a sealed injection structure that prevents leakage at the connection. The positioning block 42 is a semi-circular positioning structure.

[0024] By fitting a positioning clamp 43 onto the outer wall of multiple positioning blocks 42, the multiple expansion plates 41 are secured using the positioning clamp 43. This restricts the multiple expansion plates 41 into a complete channel. Before introducing cleaning agent into the hot nozzle 12, the positioning clamp 43 at the bottom of the hot nozzle 12 at the blockage location is cut off using a tool. Then, the multiple expansion plates 41 can be released from their fixation. During the subsequent introduction of cleaning agent, the multiple expansion plates 41 will rotate under the pressure of the cleaning agent and material, thus opening the lower flow channel of the hot nozzle 12.

[0025] In the above embodiments, such as Figure 6 and Figure 8 As shown, the method of using a tool to cut the positioning clamp 43 to release the restriction of the expansion plate 41 is a one-time use. After the hot nozzle 12 is removed and cleaned, the positioning clamp 43 needs to be used to clamp the expansion plate 41 in the same way. However, since the expansion plate 41 is restricted by the positioning clamp 43, when installing the positioning clamp 43, it is necessary to first expand the positioning clamp 43 to a size larger than the diameter of the circle where the multiple positioning blocks 42 are located, and then let it naturally shrink to clamp the edge of the expansion plate 41. Since the positioning clamp 43 is expanded and then shrunken, it cannot completely return to its original state when it shrinks. This will result in incomplete restriction of the expansion plate 41 and inconvenient installation. Therefore, in order to solve this technical problem, in this embodiment, a limiting clamp 431 is installed on the outside of the multiple positioning blocks 42. One end of the limiting clamp 431 is rotatably connected to a rotating rod 432, and the other end is threaded to the left end of the rotating rod 432.

[0026] Specifically, by rotating the rotating rod 432, the limiting clamp 431 can be pushed to expand and contract with the connection point with the rotating rod 432 as the base point.

[0027] After the hot nozzle 12 is cleaned and the blockage is removed, in order to assemble the flared part 4 more quickly and tightly, the rotating rod 432 can be rotated to increase the diameter of the limiting clamp 431. Then the limiting clamp 431 is clamped on the outside of multiple positioning blocks 42. The rotating rod 432 is rotated in the opposite direction to shrink the limiting clamp 431. Through the mechanical pulling force applied by the rotating rod 432, the flared part 4 can be assembled more quickly and tightly.

[0028] In the above embodiments, such as Figure 5 and Figure 6As shown, since it is necessary to use cleaning agent to inject into the interior of the flow channel 11 to push the material inside the hot nozzle 12 out, the interior of the hot nozzle 12 will maintain a high pressure during this process. The material and cleaning agent sprayed from the hot nozzle 12 will be sprayed out from the bottom of the hot nozzle 12 at a high speed and in a scattering manner after the pressure is released at the moment of spraying. This will cause the sprayed material and cleaning agent to cause burns and other injuries to the disassembly personnel. Therefore, in order to solve this technical problem, this embodiment also includes a protective component 3. The protective component 3 is disposed on the outer periphery of the hot nozzle 12. The protective component 3 includes an inner sleeve 31 disposed on the outer wall of the hot nozzle 12. The outer wall of the inner sleeve 31 is provided with a retractable outer sleeve 32. The outer sleeve 32 includes a first protective cylinder 321 that slides on the outer wall of the inner sleeve 31. The lower end of the first protective cylinder 321 is provided with a corrugated pipe 322. The lower end of the corrugated pipe 322 is provided with a second protective cylinder 323. The inner wall of the second protective cylinder 323 is provided with a blocking component 33 for blocking the material.

[0029] Specifically, the protective component 3 has a double-layer structure with inner and outer layers. The inner sheath 31 is located inside the outer sheath 32. The outer sheath 32 includes a first protective sleeve 321, a corrugated pipe 322, and a second protective sleeve 323 arranged from top to bottom. All three can slide on the outer wall of the inner sheath 31. There is friction between the first protective sleeve 321 and the inner sheath 31. The corrugated pipe 322 is located between the first protective sleeve 321 and the second protective sleeve 323. After the flow channel at the bottom of the hot nozzle 12 expands, hold the upper part of the first protective sleeve 321 and pull it down to move the outer sleeve 32 downward as a whole. When the lower end of the first protective sleeve 321 moves to the same height as the expansion plate 41, stop pulling down the first protective sleeve 321. This will limit the area of ​​the material and cleaning agent sprayed from the hot nozzle 12 to the area within the second protective sleeve 323. Hold the second protective sleeve 323 and bend it to one side. The corrugated pipe 322 will deform during the movement of the second protective sleeve 323, so that the originally straight channel is bent. When the material and cleaning agent sprayed from the hot nozzle 12 is sprayed out, it will be blocked by the second protective sleeve 323 and change its flow direction. This can achieve control of the splash direction, effectively avoid the possibility of personnel injury, and can also reduce its flow rate to a certain extent.

[0030] In the above embodiments, such as Figure 6 and Figure 7As shown, although the splash area and flow velocity of the material and cleaning agent sprayed from the second protective cylinder 323 are initially reduced, the path from the hot nozzle 12 to the exit of the second protective cylinder 323 is a slightly bent straight passage. This allows the material and cleaning agent to still exit the second protective cylinder 323 at a relatively fast speed and be sprayed to other locations. Therefore, in order to solve this technical problem, in this embodiment, the blocking member 33 includes a rotating shaft 331 rotatably connected to the left and right sides inside the second protective cylinder 323. A baffle 332 is provided in the middle of the rotating shaft 331, and a torsion spring 333 is provided at the front end of the rotating shaft 331. The end of the torsion spring 333 away from the rotating shaft 331 is provided on the inner wall of the second protective cylinder 323.

[0031] Specifically, the inner sheath 31 is provided with a matching structure on the side near the baffle 332. The two baffles 332 are respectively set on the left and right sides, and the installation height of the two baffles 332 is staggered. The lower arc of the baffle 332 is consistent with the circular arc with the same inner diameter of the second protective cylinder 323. This ensures that after the lower part of the baffle 332 is rotated open, its lower edge can abut well against the inner wall of the second protective cylinder 323. On the one hand, it can support the baffle 332, and on the other hand, it can increase the blocking area of ​​the baffle 332. The baffle 332, the torsion spring 333 and the rotating shaft 331 form a structure that can be driven by the torsion spring 333 to rotate and unfold. In the initial state before the baffle 332 is in operation, the baffle 332 rotates and fits against the inner wall of the second protective cylinder 323, the torsion spring 333 is in a contracted state, the outer sleeve 32 and the inner sleeve 31 are highly overlapping, and the baffle 332 protrudes from the inner wall of the second protective cylinder 323. The position of the inner sleeve 31 near the baffle 332 provides space for the baffle 332 to slide upward. At this time, the hot nozzle 12, the inner sleeve 31 and the outer sleeve 32 form a "sandwich" structure, while the baffle 332 is blocked by the outer wall of the hot nozzle 12, so that the state of the baffle 332 is locked. When the outer sleeve 32 moves downward, the baffle 332 loses the obstruction of the outer wall of the hot nozzle 12 and rotates and unfolds under the drive of the torsion spring 333. The baffle 332 cannot completely seal the lower end of the second protective cylinder 323, preventing materials and cleaning agents from clogging the inside of the second protective cylinder 323. Since the two baffles 332 are highly staggered, when the two baffles 332 unfold together, the sealing area of ​​the second protective cylinder 323 can be increased.

[0032] After the hot nozzle 12 is cleaned, close the second electric control valve 23 and pull out the cleaning agent outlet inserted into the valve nozzle 21. Then, use a tool to remove the old hot nozzle 12 and install the new hot nozzle 12. Reopen the first electric control valve 22 to allow the material to push the residual cleaning agent away from the new hot nozzle 12. This allows for quick replacement of the hot nozzle 12 without stopping the machine. After removing the old hot nozzle 12, straighten the second protective sleeve 323 and push the second protective sleeve 323 so that the outer protective sleeve 32 slides and the inner protective sleeve 31 aligns. During this process, manually push the two baffles 332 to rotate and fit against the inner wall of the second protective sleeve 323. When the baffles 332 and the rotating shaft 331 rotate, they can drive the torsion spring 333 to rotate and curl. When the upper end of the baffle 332 abuts against the side wall of the hot nozzle 12, you can stop and continue to push the outer protective sleeve 32 back to its original position. During this process, because the space between the lower end of the hot nozzle 12 and the outer protective sleeve 32 is reduced, the cleaning agent remaining between them will be squeezed out.

[0033] A method for injection control of a split-type hot runner mold, comprising the following steps: Step 1: Assemble the core components, connect the electrical and cooling water circuits, and complete the leakage and electrical preheating verification; Step 2: Hoist the mold to the injection molding machine for positioning and fixation, connect the water system, electrical system and barrel nozzle, and complete the mold closing test run and preheating and heat preservation of runner 11; Step 3: Power on the machine for trial injection and optimize parameters, start automatic mass production and conduct regular spot checks on products; Step 4: Stop the injection molding process and start the hot nozzle replacement process 12 without stopping the machine; Step 5: Cool and clean the material in flow channel 11; Step Six: Disconnect the water, electrical, and nozzle connections. After loosening the pressure plate, remove the mold from the injection molding machine and place it on the support. Step 7: Disassemble the core components, inspect and clean them, apply anti-rust oil, and store them in a dry and ventilated place.

[0034] It should be added that the core components include the manifold 1, hot nozzle 12, cavity, heating assembly, and sealing and insulation components. When using the mold for injection molding, the core components must first be cleaned, inspected, and assembled and fixed. Then, after connecting the electrical and cooling water circuits, leakage tests and electrical preheating verifications are completed. The mold is hoisted to the injection molding machine for positioning and fixing, and the water circuit, electrical circuit, and barrel nozzle are connected. After low-speed mold closing test run and preheating and heat preservation of the runner 11 until the temperature is uniform, the raw material is dried and the initial parameters are set for trial injection optimization. After the parameters are solidified, automatic batch production is carried out, and products are sampled and monitored regularly. If the hot nozzle 12 fails, it is replaced without stopping the machine. After production is completed, the runner 11 is gradually cooled and residual melt is cleaned. Finally, the water circuit, electrical circuit, and nozzle connections are disconnected, and the mold is hoisted and moved. After disassembling the core components, cleaning and inspection are carried out, and anti-rust oil is applied and the components are stored in a dry and ventilated place.

[0035] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A split-type hot runner mold structure, comprising a manifold (1), a plurality of hot nozzles (12), and a flow channel (11) formed inside the manifold (1), wherein the hot nozzles (12) are detachably mounted at the lower edge of the manifold (1), and the upper end of the hot nozzles (12) is in communication with the flow channel (11), characterized in that, The lower edge of the diversion plate (1) is provided with a diversion component (2) for injecting cleaning agent into the interior of the hot nozzle (12). The diversion component (2) includes multiple electrically controlled valves 1 (22) and 2 (23) evenly arranged on the inner edge of the diversion plate (1). Multiple valve nozzles (21) are evenly distributed on the outer edge of the diversion plate (1). The electrically controlled valve 2 (23) is installed at the end of the valve nozzle (21) near the electrically controlled valve 1 (22). The diversion plate (1) also includes a protective component (3). The protective component (3) is provided on the hot nozzle (12). The outer periphery of the nozzle (12) includes an inner sleeve (31) disposed on the outer wall of the hot nozzle (12), and an extendable outer sleeve (32) disposed on the outer wall of the inner sleeve (31). The outer sleeve (32) includes a first sleeve (321) that slides on the outer wall of the inner sleeve (31). A corrugated pipe (322) is disposed at the lower end of the first sleeve (321), and a second sleeve (323) is disposed at the lower end of the corrugated pipe (322). A blocking member (33) for blocking materials is disposed on the inner wall of the second sleeve (323).

2. The split-type hot runner mold structure according to claim 1, characterized in that, The space formed by the valve nozzle (21), the first electrically controlled valve (22), and the second electrically controlled valve (23) constitutes a three-way structure that can be opened and closed.

3. The split-type hot runner mold structure according to claim 2, characterized in that, It also includes a flared part (4), which is installed at the lower end of the hot nozzle (12). The flared part (4) includes a plurality of evenly distributed flared plates (41) rotatably connected to the lower end of the hot nozzle (12). A positioning block (42) is provided at the lower part of the flared plate (41), and a positioning hoop (43) is provided at the lower part of the hot nozzle (12). The positioning hoop (43) is sleeved on the outer wall of the plurality of positioning blocks (42).

4. The split-type hot runner mold structure according to claim 3, characterized in that, A limiting clamp (431) is installed on the outside of the plurality of positioning blocks (42). One end of the limiting clamp (431) is rotatably connected to a rotating rod (432), and the other end is threaded to the left end of the rotating rod (432).

5. The split-type hot runner mold structure according to claim 1, characterized in that, The blocking member (33) includes a rotating shaft (331) rotatably connected to the left and right sides inside the second protective sleeve (323). A baffle (332) is provided in the middle of the rotating shaft (331), and a torsion spring (333) is provided at the front end of the rotating shaft (331). One end of the torsion spring (333) away from the rotating shaft (331) is provided on the inner wall of the second protective sleeve (323).

6. The split-type hot runner mold structure according to claim 5, characterized in that, The inner sheath (31) is provided with a matching structure on the side near the baffle (332).

7. The split-type hot runner mold structure according to claim 5, characterized in that, The two baffles (332) are respectively set on the left and right sides, and the installation heights of the two baffles (332) are staggered. The lower arc of the baffle (332) is consistent with the circular arc with the same inner diameter of the second protective sleeve (323).

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