Needle valve hot runner cylinder system and needle valve hot runner

Abstract

The present invention discloses a needle valve hot runner cylinder system and a needle valve hot runner. The needle valve hot runner cylinder system includes a cylinder body, a cylinder head plate, a piston, and a hot runner guide sleeve. The cylinder head plate, cylinder body, and hot runner guide sleeve are sequentially arranged on a fixed mold plate from top to bottom. The upper end of the hot runner guide sleeve extends upward from the bottom into the lower portion of the cylinder body, and the lower end of the hot runner guide sleeve passes through the fixed mold plate from top to bottom. The lower portion of the hot runner guide sleeve is provided with a clamping step that is clamped to the fixed mold plate, and the upper portion of the hot runner guide sleeve is provided with a clamping ring that is clamped to the cylinder body, the clamping ring better clamping the cylinder body and the hot runner guide sleeve together. The bottom of the cylinder head plate is provided with an upper buffer seal ring corresponding to the inner cavity of the cylinder body, and the top of the hot runner guide sleeve is provided with a lower buffer seal ring. The needle valve hot runner cylinder system of the present invention can not only reduce the noise generated by the piston hitting the cylinder head plate, but also improve the sealing performance of the cylinder.

Description

Technical Field

[0001] The invention relates to an injection mold, in particular to a needle valve hot runner cylinder system and a needle valve hot runner. Background Art

[0002] Needle valve hot runners are becoming increasingly popular due to their advantages, such as smooth gate marks, no drooling, and the ability to coordinate with sequential control of product weld lines. The movement of the valve needle in a needle valve hot runner can be controlled by a cylinder system. However, most needle valve cylinder systems on the market lack a damping system. During production, the piston often strikes the cylinder head, generating loud noise, severely shortening cylinder life, affecting the cylinder system, and causing hot runner anomalies, thus impacting production. Furthermore, the up-and-down movement of the piston in the working area can easily drive the cylinder body up and down, causing air leaks and reducing production efficiency. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a needle valve hot runner cylinder system, which can not only reduce the noise generated by the piston hitting the cylinder cover plate, thereby increasing the service life of the cylinder, but also improve the sealing of the cylinder, thereby improving production efficiency.

[0004] The present invention also provides a needle valve hot runner comprising the needle valve hot runner cylinder system.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A needle valve hot runner cylinder system comprises a cylinder body, a cylinder cover plate, a piston and a hot runner guide sleeve, wherein the cylinder cover plate, cylinder body and hot runner guide sleeve are arranged in sequence from top to bottom on a fixed mold plate, the upper end of the hot runner guide sleeve extends from bottom to top into the lower part of the cylinder body, and the lower end of the hot runner guide sleeve passes through the fixed mold plate from top to bottom, the lower part of the hot runner guide sleeve is provided with a clamping step clamped on the fixed mold plate, the upper part of the hot runner guide sleeve is provided with a clamping ring clamped on the cylinder body, and the clamping ring better clamps the cylinder body and the hot runner guide sleeve together; the bottom of the cylinder cover plate is provided with an upper buffer sealing ring at a position corresponding to the inner cavity of the cylinder body, and the top of the hot runner guide sleeve is provided with a lower buffer sealing ring.

[0007] The working principle of the present invention is:

[0008] When the compressed gas enters the needle valve hot runner cylinder system of the present invention, it drives the piston to move upward or downward. When the piston moves upward and reaches the position of the cylinder cover plate, the piston will stop moving due to the limiting effect of the cylinder cover plate. In addition, since an upper buffer sealing ring is provided on the cylinder cover plate, the upper buffer sealing ring has a damping effect, which can reduce the noise generated by the piston hitting the cylinder cover plate, thereby improving the stability of the cylinder. Similarly, when the piston moves downward, due to the limiting effect of the hot runner guide sleeve, the piston will stop moving when it moves to the top of the hot runner guide sleeve. In addition, since the lower buffer sealing ring on the top of the hot runner guide sleeve has a damping effect, the noise generated by the piston hitting the hot runner guide sleeve will be reduced. In this project, the retaining ring clamps the cylinder body and the hot runner guide sleeve, thereby reliably limiting the position of the cylinder body and preventing it from moving up and down, thereby avoiding the cylinder body from loosening due to the up and down movement of the piston, thereby causing cylinder leakage, thereby improving product quality and production efficiency.

[0009] Preferably, the fixed mold plate is formed, from top to bottom, with a first cavity for the cylinder head plate, a second cavity for the cylinder body, and a third cavity for the hot runner guide sleeve. The first, second, and third cavities are arranged in a stepped structure with successively smaller diameters. This arrangement of the cylinder system's spatial structure facilitates the installation of various components within the cylinder system.

[0010] Preferably, a first annular space is defined between the inner wall of the second cavity and the outer wall of the cylinder body, and a connecting space is defined between the top of the second cavity and the bottom of the cylinder head plate, connecting the inner cavity of the cylinder body and the first annular space. A first vent pipe is provided on the fixed mold plate, communicating with the first annular space. This structure forms the first air inlet and outlet passage for the cylinder system between the fixed mold plate and the cylinder body, resulting in a clever structure and ease of fabrication.

[0011] Preferably, a second annular space is defined between the inner wall of the third cavity and the outer wall of the hot runner guide sleeve. A second vent is provided on the fixed mold plate, communicating with the second annular space. An exhaust hole is provided at the bottom of the cylinder body, connecting the inner cavity of the cylinder body with the second annular space. This structure creates a second air inlet and outlet passage for the cylinder system between the fixed mold plate and the cylinder body, resulting in a clever structure and ease of fabrication.

[0012] Preferably, a transition vent groove is provided at the bottom of the cylinder body, which is connected to the exhaust hole upward and to the second annular space downward. The purpose of adopting such a design is to facilitate communication between the exhaust hole and the second annular space when they are not aligned in radial position, thereby allowing gas to flow between the exhaust hole and the second annular space better.

[0013] Preferably, the outer wall of the upper portion of the hot runner guide sleeve is provided with an annular groove, into which the inner edge of the retaining ring is embedded, and the outer edge of the retaining ring is pressed against the bottom of the cylinder cavity. This design facilitates the installation and fixation of the retaining ring, thereby better clamping the cylinder body and the hot runner guide sleeve together, and preventing the cylinder body from loosening due to the up and down movement of the piston.

[0014] Preferably, a lower buffer groove is provided on the top of the hot runner guide sleeve, and the lower buffer sealing ring is embedded in the lower buffer groove. With such a technology, the lower buffer sealing ring is arranged in the placement space of the hot runner guide sleeve, which facilitates the installation of the lower buffer sealing ring.

[0015] Preferably, the clamping step is expanded in the diameter direction and clamped on the bottom of the fixed mold fixing plate. With such a design, the clamping step can act on the fixed mold fixing plate in a wider range, which is more conducive to fixing the hot runner guide sleeve on the fixed mold fixing plate.

[0016] Preferably, an upper buffer groove is provided at the bottom of the cylinder cover plate, and the upper buffer seal ring is embedded in the upper buffer groove. By adopting such a technology, the upper buffer seal ring is provided in the placement space of the cylinder cover plate, which facilitates the installation of the upper buffer seal ring.

[0017] Preferably, a first groove is provided at a position of the cylinder cover plate corresponding to the top of the second cavity, and a first sealing ring is placed in the first groove. The purpose of this is to provide a placement space for the first sealing ring, facilitate the installation of the first sealing ring, and achieve sealing of the upper part of the cylinder body.

[0018] Preferably, the bottom of the cylinder body is provided with a second groove, and the second groove is provided with a second sealing ring. The purpose of adopting the above structure is to provide a placement space for the second sealing ring, facilitate the installation of the second sealing ring, and achieve sealing of the lower part of the cylinder body.

[0019] Preferably, an upper groove is provided on the upper part of the piston, an upper sealing ring is placed in the upper groove, and the upper sealing ring acts on the inner cavity of the cylinder body; a lower groove is provided on the lower part of the piston, a lower sealing ring is placed in the lower groove, and the lower sealing ring acts on the inner cavity of the hot runner guide sleeve; the above structure is adopted to set up the placement space for the upper sealing ring and the lower sealing ring, and at the same time adapt to the design of the piston, so that the piston has good air tightness when acting on the working area of the cylinder body and the hot runner guide sleeve.

[0020] Preferably, the bottom of the piston is connected to a hot runner valve needle, which is connected to the bottom of the piston via a threaded connection structure. This structure achieves a fixed connection between the piston and the hot runner valve needle, allowing the piston to drive the valve needle to move up and down, thereby controlling the opening and closing of the gate.

[0021] A needle valve hot runner comprises the needle valve hot runner cylinder system.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention adds a damping system to the cylinder, which reduces the noise generated by the piston hitting the cylinder cover in actual operation, thereby increasing the service life of the cylinder.

[0024] 2. In the present invention, the clamping ring clamps the cylinder body and the hot runner guide sleeve, thereby reliably limiting the position of the cylinder body, further improving the sealing performance of the piston working area, and avoiding production abnormalities caused by cylinder leakage.

[0025] 3. By improving the performance and sealing of the cylinder, the production efficiency and product quality of the needle valve hot runner are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of embodiment 1 of the needle valve hot runner cylinder system of the present invention;

[0027] Figure 2 for Figure 1 The enlarged view of the needle valve hot runner cylinder system without the fixed mold plate is shown;

[0028] Figure 3 An enlarged view of the piston of the needle valve hot runner cylinder system of the present invention;

[0029] Figure 4 is a cross-sectional view of the needle valve hot runner of the present invention;

[0030] In the figure: 1. Cylinder head plate; 2. Cylinder body; 3. Hot runner guide sleeve; 4. Piston; 5. First cavity; 6. Second cavity; 7. Third cavity; 8. First vent pipe; 9. Second vent pipe; 10. Fixed mold plate; 11. First annular space; 12. Second annular space; 13. Connecting space; 14. Upper buffer seal ring; 15. Lower buffer seal ring; 16. First seal ring; 17. Second seal ring; 18. Upper seal ring; 19. Lower seal ring; 20. Exhaust hole; 21. Retaining ring; 22. Clamping step; 23. Transition vent groove; 24. Hot runner valve needle; 25. Hot runner plate; 26. Valve needle sleeve cap; 27. Valve needle sleeve; 28. Diverter plate; 29. Hot nozzle body; 30. Hot nozzle nozzle; 31. Hot nozzle sealing ring. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.

[0032] Example 1.

[0033] See also Figure 1 and Figure 2The needle valve hot runner cylinder system of the present invention includes a cylinder body 2, a cylinder cover plate 1, a piston 4 and a hot runner guide sleeve 3, wherein the cylinder cover plate 1, the cylinder body 2 and the hot runner guide sleeve 3 are arranged on the fixed mold fixing plate 10 in sequence from top to bottom, the upper end of the hot runner guide sleeve 3 extends from bottom to top into the lower part of the cylinder body 2, and the lower end of the hot runner guide sleeve 3 passes through the fixed mold fixing plate 10 from top to bottom, the lower part of the hot runner guide sleeve 3 is provided with a clamping step 22 clamped on the fixed mold fixing plate 10, and the upper part of the hot runner guide sleeve 3 is provided with a clamping ring 21 clamped on the cylinder body 2, the clamping step 22 clamps the hot runner guide sleeve 3 on the fixed mold fixing plate 10, and the clamping ring 21 better clamps the cylinder body 2 and the hot runner guide sleeve 3 together; an upper buffer sealing ring 14 is provided at the bottom of the cylinder cover plate 1 at a position corresponding to the inner cavity of the cylinder body 2, and a lower buffer sealing ring 15 is provided on the top of the hot runner guide sleeve 3.

[0034] See also Figure 1 In the fixed mold plate 10, a first cavity 5 for placing the cylinder head plate 1, a second cavity 6 for placing the cylinder body 2, and a third cavity 7 for placing the hot runner guide sleeve 3 are sequentially opened from top to bottom. The first cavity 5, the second cavity 6, and the third cavity 7 are arranged in a stepped structure with successively smaller diameters. Arranging the spatial structure of the cylinder system in this way facilitates the installation and arrangement of various components in the cylinder system.

[0035] See also Figure 1 and Figure 2 A first annular space 11 is provided between the inner wall of the second cavity 6 and the outer wall of the cylinder body 2, and a connecting space 13 connecting the inner cavity of the cylinder body 2 and the first annular space 11 is provided between the top of the second cavity 6 and the bottom of the cylinder cover plate 1; a first ventilation pipe 8 is provided on the fixed mold fixing plate 10, and the first ventilation pipe 8 is connected to the first annular space 11; by adopting the above structure, the first inlet and outlet air channel of the cylinder system is formed between the fixed mold fixing plate 10 and the cylinder body 2, the structure is ingenious, and it is easy to process.

[0036] See also Figure 1 and Figure 2 A second annular space 12 is provided between the inner wall of the third cavity 7 and the outer wall of the hot runner guide sleeve 3, and a second vent pipe 9 is provided on the fixed mold plate 10, and the second vent pipe 9 is connected to the second annular space 12; an exhaust hole 20 is provided at the bottom of the cylinder body 2, and the exhaust hole 20 connects the inner cavity of the cylinder body 2 with the second annular space 12; adopting the above structure, a second air inlet and outlet channel of the cylinder system is formed between the fixed mold plate 10 and the cylinder body 2, which has an ingenious structure and is easy to process.

[0037] See also Figure 1 and Figure 2A transition vent groove 23 is provided at the bottom of the cylinder body 2, which is connected to the exhaust hole 20 upward and to the second annular space 12 downward. Since the exhaust hole 20 and the second annular space 12 are not aligned in radial position, the gas cannot flow smoothly between the second annular space 12 and the exhaust hole 20. The transition vent groove 23 allows the gas to flow better between the exhaust hole 20 and the second annular space 12.

[0038] See also Figure 2 An annular groove is provided on the outer wall of the upper part of the hot runner guide sleeve 3, the inner edge of the clamping ring 21 is embedded in the annular groove, and the outer edge of the clamping ring 21 is pressed against the bottom of the cylinder cavity; such a design facilitates the installation of the clamping ring 21, thereby better clamping the cylinder body 2 and the hot runner guide sleeve 3 together, preventing the piston 4 from driving the cylinder body 2 to move when moving up and down, thereby causing the cylinder body 2 to loosen.

[0039] See also Figure 2 A lower buffer groove is provided at the top of the hot runner guide sleeve 3, and the lower buffer sealing ring 15 is embedded in the lower buffer groove; using this technology, the lower buffer sealing ring 15 is provided in the placement space of the hot runner guide sleeve 3, which is convenient for the installation of the lower buffer sealing ring 15.

[0040] See also Figure 1 and Figure 2 The clamping step 22 is expanded along the diameter direction and clamped on the bottom of the fixed mold fixing plate 10; such a design allows the clamping step 22 to act on the fixed mold fixing plate 10 in a larger range, which is more conducive to fixing the hot runner guide sleeve 3 on the fixed mold fixing plate 10.

[0041] See also Figure 2 An upper buffer groove is provided at the bottom of the cylinder cover plate 1, and the upper buffer sealing ring 14 is embedded in the upper buffer groove; using this technology, a placement space for the upper buffer sealing ring 14 is provided on the cylinder cover plate 1, which facilitates the installation of the upper buffer sealing ring 14.

[0042] See also Figure 2 A first groove is provided at a position corresponding to the bottom of the cylinder cover plate 1 and the second cavity 6, and a first sealing ring 16 is placed in the first groove; the purpose of doing this is to provide a placement space for the first sealing ring 16, facilitate the installation of the first sealing ring 16, and realize the sealing of the upper part of the cylinder body 2.

[0043] See also Figure 2 A second groove is provided at the bottom of the cylinder body 2, and a second sealing ring 17 is provided in the second groove; the purpose of adopting the above structure is to provide a placement space for the second sealing ring 17, to facilitate the installation of the second sealing ring 17, and to achieve sealing of the lower part of the cylinder body 2.

[0044] See also Figure 2 and Figure 3 The upper part of the piston 4 is provided with an upper groove, in which an upper sealing ring 18 is placed, and the upper sealing ring 18 acts on the inner cavity of the cylinder body 2; the lower part of the piston 4 is provided with a lower groove, in which a lower sealing ring 19 is placed, and the lower sealing ring 19 acts on the inner cavity of the hot runner guide sleeve 3; the above structure is adopted to set the placement space of the upper sealing ring 18 and the lower sealing ring 19, and at the same time adapt to the design of the piston 4, so that the piston 4 has good air tightness when acting on the working area of the cylinder body 2 and the hot runner guide sleeve 3.

[0045] See also Figure 3 A hot runner valve needle 24 is connected to the bottom of the piston 4, and the hot runner valve needle 24 is connected to the bottom of the piston 4 through a threaded connection structure; the above structure is adopted to achieve a fixed connection between the piston 4 and the hot runner valve needle 24, so that the piston 4 drives the valve needle to move up and down, thereby controlling the opening and closing of the gate.

[0046] See also Figure 1 and Figure 2 , the piston 4 slides on the inner wall of the cylinder 2, and the inner cavity of the cylinder 2 is provided with a working area for the movement of the piston 4; when the compressed air enters from the first vent pipe 8, it enters the first annular space 11 and moves to the connecting space 13 and then enters the inner cavity of the cylinder 2. Due to the downward thrust of the compressed air, the piston 4 is driven to move downward, and the gas is discharged through the exhaust hole 20 of the cylinder 2 and finally discharged from the second vent pipe 9; when the piston 4 moves to the hot runner guide sleeve 3, due to the limiting effect of the hot runner guide sleeve 3, the piston 4 will stop moving. Since the lower buffer sealing ring 15 of the hot runner guide sleeve 3 has a damping effect, the noise generated by the piston 4 hitting the hot runner guide sleeve 3 will be reduced; in this process, the clamping ring 21 clamps the cylinder 2 and the hot runner guide sleeve 3 so that the cylinder 2 will not move up and down, avoiding the cylinder 2 loosening due to the downward movement of the piston 4, causing cylinder leakage.

[0047] See also Figure 1 and Figure 2 When compressed air enters from the second ventilation pipe 9, it enters the second annular space 12 and then enters the inner cavity of the cylinder body 2 through the transition ventilation groove 23 and the exhaust hole 20 in sequence. Due to the upward thrust of the compressed air, the piston 4 is driven to move upward, and the gas above the piston 4 is discharged through the connecting space 13 between the cylinder body 2 and the cylinder cover plate 1, and thus discharged from the first ventilation pipe 8; when the piston 4 moves to the cylinder cover plate 1, due to the limiting effect of the cylinder cover plate 1, the piston 4 will stop moving, and because the upper buffer sealing ring 14 of the cylinder cover plate 1 has a damping effect, the noise generated by the piston 4 hitting the cylinder cover plate 1 will be reduced; in this process, the retaining ring 21 clamps the cylinder body 2 and the hot runner guide sleeve 3 so that the cylinder body 2 will not move up and down, thereby avoiding the cylinder body 2 loosening due to the downward movement of the piston 4, causing cylinder leakage.

[0048] Example 2.

[0049] This embodiment provides a needle valve hot runner, which includes the needle valve hot runner cylinder system of the present invention.

[0050] See also Figure 4 The needle valve hot runner of the present invention includes a hot runner plate 25, a diverter plate 28, a hot nozzle body 29 and the needle valve hot runner cylinder system of the present invention; the hot nozzle body 29 is provided with a hot nozzle nozzle 30 and a hot nozzle sealing ring 31 for fixing the hot nozzle nozzle 30 to the bottom of the hot nozzle body 29; the diverter plate 28 is provided with a needle valve sleeve 27 and a needle valve sleeve cap 26 installed on the needle valve sleeve 27.

[0051] See also Figure 4 , insert the hot nozzle body 29 on the hot runner plate 25, and then install the diverter plate 28 and the needle valve hot runner cylinder system of the present invention; the piston 4 is connected to the hot runner needle valve 24, which will drive the hot runner needle valve 24 to move up and down; when the piston 4 moves upward, it drives the hot runner needle valve 22 to move upward, thereby opening the gate; when the piston 4 moves downward, it drives the hot runner needle valve 22 to move downward, thereby closing the gate.

[0052] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A needle valve hot runner cylinder system, comprising a cylinder body, a cylinder cover plate, a piston and a hot runner guide sleeve, wherein: The cylinder cover plate, cylinder body and hot runner guide sleeve are sequentially arranged on the fixed mold plate from top to bottom, and are characterized in that the upper end of the hot runner guide sleeve extends from bottom to top into the lower part of the cylinder body, and the lower end of the hot runner guide sleeve passes through the fixed mold plate from top to bottom, the lower part of the hot runner guide sleeve is provided with a clamping step clamped on the fixed mold plate, and the upper part of the hot runner guide sleeve is provided with a clamping ring clamped on the cylinder body, and the clamping ring better clamps the cylinder body and the hot runner guide sleeve together; the bottom of the cylinder cover plate is provided with an upper buffer sealing ring at a position corresponding to the inner cavity of the cylinder body, and the top of the hot runner guide sleeve is provided with a lower buffer sealing ring.

2. The needle valve hot runner cylinder system according to claim 1, characterized in that: The fixed mold fixing plate is provided with a first cavity for placing the cylinder cover plate, a second cavity for placing the cylinder body and a third cavity for placing the hot runner guide sleeve from top to bottom. The first cavity, the second cavity and the third cavity are arranged in a stepped structure with successively smaller diameters.

3. The needle valve hot runner cylinder system according to claim 2, characterized in that: A first annular space is provided between the inner wall of the second cavity and the outer wall of the cylinder body, and a connecting space is provided between the top of the second cavity and the bottom of the cylinder cover plate to connect the inner cavity of the cylinder body and the first annular space; a first ventilation pipe is provided on the fixed mold fixing plate, and the first ventilation pipe is connected to the first annular space.

4. The needle valve hot runner cylinder system according to claim 2, characterized in that: A second annular space is provided between the inner wall of the third cavity and the outer wall of the hot runner guide sleeve, a second ventilation pipe is provided on the fixed mold fixing plate, and the second ventilation pipe is connected to the second annular space; an exhaust hole is provided at the bottom of the cylinder body, and the exhaust hole connects the inner cavity of the cylinder body with the second annular space.

5. The needle valve hot runner cylinder system according to claim 4, characterized in that: A transition vent groove is provided at the bottom of the cylinder body. The transition vent groove is connected to the exhaust hole upward and is connected to the second annular space downward.

6. The needle valve hot runner cylinder system according to claim 1, characterized in that: An annular groove is provided on the outer wall of the upper portion of the hot runner guide sleeve, the inner edge of the clamping ring is embedded in the annular groove, and the outer edge of the clamping ring is pressed tightly against the bottom of the cylinder cavity.

7. The needle valve hot runner cylinder system according to any one of claims 1 to 6, characterized in that: A lower buffer groove is provided on the top of the hot runner guide sleeve, and the lower buffer sealing ring is embedded in the lower buffer groove.

8. The needle valve hot runner cylinder system according to claim 7, characterized in that: The clamping step is expanded along the diameter direction and clamped on the bottom of the fixed mold plate.

9. The needle valve hot runner cylinder system according to any one of claims 1 to 6 or 8, characterized in that: An upper buffer groove is provided at the bottom of the cylinder cover plate, and the upper buffer sealing ring is embedded in the upper buffer groove.

10. The needle valve hot runner cylinder system according to claim 2, characterized in that: A first groove is provided at a position of the cylinder cover plate corresponding to the top of the second cavity, and a first sealing ring is placed in the first groove.

11. The needle valve hot runner cylinder system according to claim 1, characterized in that: The bottom of the cylinder body is provided with a second groove, and the second groove is provided with a second sealing ring.

12. The needle valve hot runner cylinder system according to claim 1, characterized in that: An upper groove is provided on the upper part of the piston, an upper sealing ring is placed in the upper groove, and the upper sealing ring acts on the inner cavity of the cylinder body; a lower groove is provided on the lower part of the piston, a lower sealing ring is placed in the lower groove, and the lower sealing ring acts on the inner cavity of the hot runner guide sleeve.

13. The needle valve hot runner cylinder system according to claim 1 or 12, characterized in that: The bottom of the piston is connected to a hot runner valve needle, and the hot runner valve needle is connected to the bottom of the piston through a threaded connection structure.

14. A needle valve hot runner, characterized in that: The invention comprises the needle valve hot runner cylinder system according to any one of claims 1 to 13.

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