A cylinder for a needle valve hot runner

Abstract

The utility model discloses a cylinder for needle valve hot runner, including cylinder body, first cylinder barrel, second cylinder barrel, partition, piston and piston gasket. The cylinder for needle valve hot runner is through first cylinder barrel, second cylinder barrel, partition, piston, piston gasket and the cooperation of piston sheet on piston, and first piston cavity and second piston cavity are divided into first cavity, second cavity, third cavity and fourth cavity, are equipped with first gas exchange channel and second gas exchange channel in the piston, first gas exchange channel links first cavity and third cavity, and second gas exchange channel links second cavity and fourth cavity, forms double cylinder structure, realizes double cylinder pushing under the condition that one gas exchange hole admits air, and another gas exchange hole discharges air, obtains greater thrust than ordinary cylinder under the same volume, and the practicality is strong, and production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment, and in particular to a cylinder for a needle valve hot runner. Background Technology

[0002] Hot runner systems in injection molding equipment are generally divided into two types: open type and needle valve type. For commonly used needle valve type hot runner systems, they generally include a cylinder, hot nozzle body, valve needle, valve needle sleeve, and manifold. The injection port located at the end of the hot nozzle body is opened and closed by the movement of the valve needle inside the hot nozzle body. When sealing the needle, the valve needle and the mold need to be precisely fitted together.

[0003] In existing needle valve type hot runner devices, the injection molding process requires the valve needle to have a large thrust to ensure the injection quality. Under the same air pressure, the existing needle valve type hot runner can increase the thrust by increasing the volume of the cylinder, but this structure will increase the thickness of the template and the processing difficulty, increase the production cost, and is not very practical. Utility Model Content

[0004] The purpose of this invention is to provide a cylinder for hot runner systems of needle valves to solve the problem of insufficient thrust of cylinders used in hot runner systems of needle valves.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a cylinder for a needle valve hot runner, including a cylinder body, a first cylinder barrel, a second cylinder barrel, a partition plate, a piston, and a piston gasket;

[0007] The cylinder body has an accommodating space, and the bottom of the cylinder body has a piston through hole. The first cylinder and the second cylinder are respectively disposed in the accommodating space. The side wall of the first cylinder protrudes outward to form a boss, and the boss divides the accommodating space into a first ventilation chamber and a second ventilation chamber. The first cylinder is located in the first ventilation chamber, and the first ventilation chamber is located on one side of the piston through hole. The second cylinder is located in the second ventilation chamber. The cylinder body has a first ventilation hole and a second ventilation hole. The first ventilation hole communicates with the first ventilation chamber. The second ventilation hole communicates with the second ventilation chamber.

[0008] The first cylinder has a first piston chamber; the second cylinder has a second piston chamber, and the partition plate covers the opening of the second piston chamber; the opening of the first piston chamber faces the second cylinder, and the first cylinder and the partition plate cooperate to form a ventilation gap; the bottom of the first cylinder has a ventilation hole.

[0009] The lower end of the piston passes through the first cylinder and exits through the piston through hole, while the upper end of the piston passes through the partition plate and enters the second ventilation chamber. A piston plate is provided in the middle of the piston, which divides the first piston chamber into a first chamber and a second chamber. A piston gasket is provided at the upper end of the piston and divides the second piston chamber into a third chamber and a fourth chamber.

[0010] The piston is provided with a first ventilation channel and a second ventilation channel; one end of the first ventilation channel is connected to a first cavity, and the other end of the first ventilation channel is connected to a third cavity; one end of the second ventilation channel is connected to a second cavity, and the other end of the second ventilation channel is connected to a fourth cavity.

[0011] The cylinder for the hot runner of the needle valve also includes a connector, which is located at the lower end of the piston. The bottom of the connector is provided with a mounting groove for mounting the valve needle.

[0012] In the cylinder for the hot runner of the needle valve, the first air exchange channel includes a first vertical channel and a first inclined channel; the piston is provided with a first air hole and a second air hole, the first air hole is located at the bottom of the piston plate; the second air hole is located at the upper end near the piston, and the second air hole is located below the piston gasket.

[0013] The first vertical channel is disposed inside the piston along the piston axis, the first inclined channel is disposed inclinedly on the piston plate, one end of the first inclined channel is connected to the first air hole, the other end of the first inclined channel is connected to the lower end of the first vertical channel, and the upper end of the first vertical channel is connected to the second air hole.

[0014] In the cylinder for the hot runner of the needle valve, the second air exchange channel includes a second vertical channel and a second inclined channel; the piston is provided with a third air hole and a fourth air hole, the third air hole being disposed at the top of the piston plate; the fourth air hole being disposed at the upper end of the piston; the second vertical channel is disposed within the piston along the axial direction of the piston, the second inclined channel is disposed inclinedly on the piston plate, one end of the second inclined channel is connected to the third air hole, the other end of the second inclined channel is connected to the lower end of the second vertical channel, and the upper end of the second vertical channel is connected to the fourth air hole.

[0015] In the cylinder used for the hot runner of the needle valve, the boss is provided with a first annular sealing groove, and a first sealing ring is installed in the first annular sealing groove.

[0016] In the cylinder used for the hot runner of the needle valve, the side walls of the piston plate and the piston gasket are provided with a second annular sealing groove, and a second sealing ring is installed in the second annular sealing groove.

[0017] In the cylinder for the hot runner of the needle valve, the second cylinder barrel includes an integrally formed cylinder barrel body and a connecting cover.

[0018] The upper end of the accommodating space is provided with an installation port, and the connecting cover is detachably connected to the installation port so that the cylinder body is fixed in the accommodating space;

[0019] The cylinder body and the connecting cover are provided with a third annular sealing groove, and a third sealing ring is installed in the third annular sealing groove.

[0020] In the cylinder for the hot runner of the needle valve, the bottom of the first cylinder barrel is provided with a sliding hole, and the lower end of the piston is slidably fitted into the sliding hole; the side wall of the sliding hole is provided with a fourth annular sealing groove, and a fourth sealing ring is installed in the fourth annular sealing groove; the ventilation hole is provided on the outer periphery of the sliding hole.

[0021] A connecting platform extends downward from the outer edge of the sliding hole. The connecting platform is embedded in the piston through hole, and the side wall of the connecting platform is provided with a fifth annular sealing groove. A fifth sealing ring is installed in the fifth annular sealing groove.

[0022] One of the technical solutions of this utility model can have the following beneficial effects:

[0023] The cylinder used for the hot runner of the needle valve, through the cooperation of a first cylinder barrel, a second cylinder barrel, a partition plate, a piston, a piston gasket, and a piston plate on the piston, divides the first piston chamber and the second piston chamber into a first chamber, a second chamber, a third chamber, and a fourth chamber. The piston is provided with a first ventilation channel and a second ventilation channel. The first ventilation channel connects the first chamber and the third chamber, and the second ventilation channel connects the second chamber and the fourth chamber, forming a dual-cylinder structure. With air entering through one ventilation port and exiting through the other ventilation port, dual-cylinder propulsion is achieved. Under the same volume, it obtains greater thrust than ordinary cylinders, which is more practical and reduces production costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0025] Figure 2 This is a cross-sectional schematic diagram of one embodiment of the present invention;

[0026] Figure 3 This is a diagram showing the connection relationship between the first cylinder and the second cylinder in one embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the piston structure in one embodiment of the present invention;

[0028] Figure 5 yes Figure 4A schematic diagram of the structure on the other side of the embodiment;

[0029] Figure 6 This is a cross-sectional schematic diagram of the piston in one embodiment of this utility model;

[0030] In the attached diagram: 1. Cylinder block; 2. First cylinder barrel; 3. Second cylinder barrel; 4. Divider plate; 5. Piston; 6. Piston gasket; 7. Connecting component;

[0031] Piston through hole 10, boss 20; first air exchange chamber 11, second air exchange chamber 12; first air exchange hole 13, second air exchange hole 14; air exchange gap 21; air exchange through hole 22; cylinder body 31, connecting cover 32; piston plate 50; first air exchange channel 51, second air exchange channel 52; second annular sealing groove 61; second sealing ring 62; mounting slide groove 71;

[0032] First cavity 101, second cavity 102; third cavity 103, fourth cavity 104; first annular sealing groove 201; first sealing ring 202; fourth annular sealing groove 203; fourth sealing ring 204; connecting platform 205; fifth annular sealing groove 206; fifth sealing ring 207; third annular sealing groove 311; third sealing ring 312; first vertical channel 511, first inclined channel 512; first vent 513, second vent 514; second vertical channel 521, second inclined channel 522; third vent 523, fourth vent 524. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis.

[0035] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Please refer to Figures 1-6 This utility model provides a cylinder for a needle valve hot runner, including a cylinder body 1, a first cylinder barrel 2, a second cylinder barrel 3, a partition plate 4, a piston 5, and a piston gasket 6;

[0038] The cylinder body 1 has an accommodating space, and the bottom of the cylinder body 1 has a piston through hole 10. The first cylinder 2 and the second cylinder 3 are respectively disposed in the accommodating space. The side wall of the first cylinder 2 protrudes outward to form a boss 20, which divides the accommodating space into a first ventilation chamber 11 and a second ventilation chamber 12. The first cylinder 2 is located in the first ventilation chamber 11, and the first ventilation chamber 11 is located on one side of the piston through hole 10. The second cylinder 3 is located in the second ventilation chamber 12. The cylinder body 1 has a first ventilation hole 13 and a second ventilation hole 14. The first ventilation hole 13 communicates with the first ventilation chamber 11. The second ventilation hole 14 communicates with the second ventilation chamber 12.

[0039] The first cylinder 2 is provided with a first piston chamber; the second cylinder 3 is provided with a second piston chamber, and the partition plate 4 covers the opening of the second piston chamber; the opening of the first piston chamber faces the second cylinder 3, and the first cylinder 2 and the partition plate 4 cooperate to form a ventilation gap 21; the bottom of the first cylinder 2 is provided with a ventilation hole 22.

[0040] The lower end of the piston 5 passes through the first cylinder 2 and exits through the piston through hole 10, and the upper end of the piston 5 passes through the partition plate 4 and enters the second ventilation chamber 12; the piston 5 is provided with a piston plate 50 in the middle, which divides the first piston chamber into a first chamber 101 and a second chamber 102; the piston gasket 6 is provided at the upper end of the piston 5 and divides the second piston chamber into a third chamber 103 and a fourth chamber 104;

[0041] The piston 5 is provided with a first ventilation channel 51 and a second ventilation channel 52; one end of the first ventilation channel 51 is connected to the first cavity 101, and the other end of the first ventilation channel 51 is connected to the third cavity 103; one end of the second ventilation channel 52 is connected to the second cavity 102, and the other end of the second ventilation channel 52 is connected to the fourth cavity 104.

[0042] The cylinder used for the hot runner of the needle valve, through the cooperation of a first cylinder 2, a second cylinder 3, a partition plate 4, a piston 5, a piston gasket 6, and a piston plate 50 on the piston 5, divides the first piston chamber and the second piston chamber into a first chamber 101, a second chamber 102, a third chamber 103, and a fourth chamber 104. The piston 5 is provided with a first ventilation channel 51 and a second ventilation channel 52. The first ventilation channel 51 connects the first chamber 101 and the third chamber 103, and the second ventilation channel 52 connects the second chamber 102 and the fourth chamber 104, forming a dual-cylinder structure. With air entering through one ventilation port and exiting through the other ventilation port, dual-cylinder propulsion is achieved. Under the same volume, it obtains greater thrust than ordinary cylinders, which is more practical and reduces production costs.

[0043] The boss 20 divides the accommodating space into a first ventilation chamber 11 and a second ventilation chamber 12; the ventilation gap 21 is located in the second ventilation chamber 12, so that the air in the second cavity 102 can communicate with the second ventilation chamber 12.

[0044] When the cylinder needs to move the valve needle upward, compressed air is introduced into the first ventilation chamber 11 through the first ventilation port 13. The compressed air enters the first chamber 101 of the first cylinder 2 through the ventilation port 22. At the same time, the compressed air enters the third chamber 103 through the first ventilation channel 51. The piston plate 50 and the piston gasket 6 are simultaneously subjected to the upward pressure of the compressed air, which drives the piston 5 to move upward, thereby enabling the piston 5 to move the valve needle upward. When the piston 5 moves upward, the second chamber 102 and the fourth chamber 104 are compressed. The air in the fourth chamber 104 enters the second chamber 102 through the second ventilation channel 52, while the air in the second chamber 102 enters the second ventilation chamber 12 through the ventilation gap 21 and then exits the cylinder through the second ventilation port 14.

[0045] When the cylinder needs to move the valve needle downwards, compressed air is introduced into the second ventilation chamber 12 through the second ventilation port 14. The compressed air enters the second chamber 102 of the first cylinder 2 through the ventilation gap 21. At the same time, the compressed air enters the fourth chamber 104 through the second ventilation channel 52. The piston plate 50 and the piston gasket 6 are simultaneously subjected to the downward pressure of the compressed air, causing the piston 5 to move downwards, thereby enabling the piston 5 to move the valve needle downwards. When the piston 5 moves downwards, the first chamber 101 and the third chamber 103 are compressed. The air in the third chamber 103 enters the first chamber 101 through the first ventilation channel 51, while the air in the first chamber 101 enters the first ventilation chamber 11 through the ventilation port 22 and then exits the cylinder through the first ventilation port 13.

[0046] Specifically, it also includes a connector 7, which is disposed at the lower end of the piston 5. The bottom of the connector 7 is provided with a mounting groove 71, which is used to install the valve needle.

[0047] The upper end of the connector 7 is connected to the piston 5, while the lower end of the connector 7 is used to connect and install the valve needle. The connector 7 installs the valve needle by setting the installation groove 71, which ensures the stable connection of the valve needle and reduces the difficulty of installing the valve needle, making it easier for workers to disassemble or repair.

[0048] Specifically, the first ventilation channel 51 includes a first vertical channel 511 and a first inclined channel 512; the piston 5 is provided with a first air hole 513 and a second air hole 514, the first air hole 513 is located at the bottom of the piston plate 50; the second air hole 514 is located at the upper end near the piston 5, and the second air hole 514 is located below the piston gasket 6.

[0049] The first vertical channel 511 is disposed within the piston 5 along the axial direction of the piston 5, and the first inclined channel 512 is disposed inclinedly on the piston plate 50. One end of the first inclined channel 512 is connected to the first air hole 513, and the other end of the first inclined channel 512 is connected to the lower end of the first vertical channel 511. The upper end of the first vertical channel 511 is connected to the second air hole 514.

[0050] The first ventilation channel 51 consists of a first vertical channel 511 and a first inclined channel 512. One end of the first ventilation channel 51 has a first vent 513, and the other end has a second vent 514. The first vertical channel 511 is vertically disposed inside the piston 5 along the axial direction of the piston 5, while the first inclined channel 512 is disposed on the piston plate 50. In order to connect the first vent 513 and the first vertical channel 511, the first inclined channel 512 is gradually inclined upward toward the central axis of the piston 5.

[0051] The above structure facilitates the flow of compressed air between the first chamber 101 and the third chamber 103, while preventing the first chamber 101 and the third chamber 103 from communicating with the second chamber 102 or the fourth chamber 104, thus avoiding the problem of reduced cylinder thrust due to air leakage.

[0052] Specifically, the second ventilation channel 52 includes a second vertical channel 521 and a second inclined channel 522; the piston 5 is provided with a third air hole 523 and a fourth air hole 524, the third air hole 523 is disposed at the top of the piston plate 50; the fourth air hole 524 is disposed at the upper end of the piston 5; the second vertical channel 521 is disposed in the piston 5 along the axial direction of the piston 5, the second inclined channel 522 is disposed inclinedly in the piston plate 50, one end of the second inclined channel 522 is connected to the third air hole 523, the other end of the second inclined channel 522 is connected to the lower end of the second vertical channel 521, and the upper end of the second vertical channel 521 is connected to the fourth air hole 524.

[0053] The second ventilation channel 52 consists of a second vertical channel 521 and a second inclined channel 522. One end of the second ventilation channel 52 has a third air hole 523 as its connecting port, and the other end has a fourth air hole 524 as its connecting port. The second vertical channel 521 is vertically arranged inside the piston 5 along the axial direction of the piston 5, while the second inclined channel 522 is located at the top of the piston plate 50. In order to connect the third air hole 523 and the second vertical channel 521, and at the same time reduce the impact force of compressed air on the connection between the second vertical channel 521 and the second inclined channel 522, the second inclined channel 522 gradually slopes downward toward the central axis of the piston 5.

[0054] The above structure facilitates the flow of compressed air between the second chamber 102 and the fourth chamber 104, while preventing the second chamber 102 and the fourth chamber 104 from communicating with the first chamber 101 or the third chamber 103, thus avoiding the problem of reduced cylinder thrust due to air leakage.

[0055] Specifically, the boss 20 is provided with a first annular sealing groove 201, and a first sealing ring 202 is installed in the first annular sealing groove 201.

[0056] With the above structure, the first air exchange chamber 11 and the second air exchange chamber 12 can be sealed and separated by the first sealing ring 202, so that the first air exchange chamber 11 and the second air exchange chamber 12 are independent of each other, preventing air leakage between the first air exchange chamber 11 and the second air exchange chamber 12, thereby avoiding a reduction in the thrust of the cylinder.

[0057] Preferably, the sidewalls of the piston plate 50 and the piston gasket 6 are provided with a second annular sealing groove 61, and a second sealing ring 62 is installed in the second annular sealing groove 61.

[0058] The second sealing ring 62 on the piston plate 50 can seal and separate the first cavity 101 and the second cavity 102, preventing air leakage between the first cavity 101 and the second cavity 102. Similarly, the second sealing ring 62 on the piston gasket 6 can seal and separate the third cavity 103 and the fourth cavity 104, preventing air leakage between the third cavity 103 and the fourth cavity 104.

[0059] Specifically, the second cylinder 3 includes an integrally formed cylinder body 31 and a connecting cover 32;

[0060] The upper end of the accommodating space is provided with an installation port, and the connecting cover 32 is detachably connected to the installation port so that the cylinder body 31 is fixed in the accommodating space;

[0061] A third annular sealing groove 311 is provided at the connection between the cylinder body 31 and the connecting cover 32, and a third sealing ring 312 is installed in the third annular sealing groove 311.

[0062] The connecting cover 32 is used to install the second cylinder 3 onto the cylinder body 1, so that the cylinder body 31 is fixed in the accommodating space. The partition plate 4 is fixed at the opening of the cylinder body 31, sealing and separating the second piston chamber and the second air exchange chamber 12, preventing the second piston chamber and the second air exchange chamber 12 from communicating with each other.

[0063] The third sealing ring 312 can seal and separate the second air exchange chamber 12 from the outside of the cylinder body 1, preventing air leakage from the second air exchange chamber 12.

[0064] Specifically, the bottom of the first cylinder 2 is provided with a sliding hole, and the lower end of the piston 5 is slidably fitted into the sliding hole; the side wall of the sliding hole is provided with a fourth annular sealing groove 203, and a fourth sealing ring 204 is installed in the fourth annular sealing groove 203; the ventilation hole 22 is provided on the outer periphery of the sliding hole.

[0065] A connecting platform 205 extends downward from the outer edge of the sliding hole. The connecting platform 205 is embedded in the piston through hole 10, and the side wall of the connecting platform 205 is provided with a fifth annular sealing groove 206. A fifth sealing ring 207 is installed in the fifth annular sealing groove 206.

[0066] The fourth sealing ring 204 can seal and separate the first cavity 101 and the sliding hole, preventing gas in the first cavity 101 from leaking through the sliding hole during piston movement. Similarly, the fifth sealing ring 207 can seal and separate the first ventilation cavity 11 and the piston through hole 10, preventing gas in the first ventilation cavity 11 from leaking through the piston through hole 10.

[0067] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A cylinder for a needle valve hot runner, characterized in that, Includes cylinder block, first cylinder barrel, second cylinder barrel, partition plate, piston, and piston gasket; The cylinder body has an accommodating space, and the bottom of the cylinder body has a piston through hole. The first cylinder and the second cylinder are respectively disposed in the accommodating space. The side wall of the first cylinder protrudes outward to form a boss, and the boss divides the accommodating space into a first ventilation chamber and a second ventilation chamber. The first cylinder is located in the first ventilation chamber, and the first ventilation chamber is located on one side of the piston through hole. The second cylinder is located in the second ventilation chamber. The cylinder body has a first ventilation hole and a second ventilation hole. The first ventilation hole communicates with the first ventilation chamber. The second ventilation hole communicates with the second ventilation chamber. The first cylinder has a first piston chamber; the second cylinder has a second piston chamber, and the partition plate covers the opening of the second piston chamber; the opening of the first piston chamber faces the second cylinder, and the first cylinder and the partition plate cooperate to form a ventilation gap; the bottom of the first cylinder has a ventilation hole. The lower end of the piston passes through the first cylinder and exits through the piston through hole, while the upper end of the piston passes through the partition plate and enters the second ventilation chamber. A piston plate is provided in the middle of the piston, which divides the first piston chamber into a first chamber and a second chamber. A piston gasket is provided at the upper end of the piston and divides the second piston chamber into a third chamber and a fourth chamber. The piston is provided with a first ventilation channel and a second ventilation channel; one end of the first ventilation channel is connected to a first cavity, and the other end of the first ventilation channel is connected to a third cavity; one end of the second ventilation channel is connected to a second cavity, and the other end of the second ventilation channel is connected to a fourth cavity.

2. A cylinder for a needle valve hot runner according to claim 1, characterized in that, It also includes a connector, which is disposed at the lower end of the piston. The bottom of the connector is provided with a mounting groove for mounting a valve needle.

3. A cylinder for a needle valve hot runner according to claim 1, characterized in that, The first ventilation channel includes a first vertical channel and a first inclined channel; the piston is provided with a first air hole and a second air hole, the first air hole is located at the bottom of the piston plate; the second air hole is located at the upper end near the piston, and the second air hole is located below the piston gasket. The first vertical channel is disposed inside the piston along the piston axis, the first inclined channel is disposed inclinedly on the piston plate, one end of the first inclined channel is connected to the first air hole, the other end of the first inclined channel is connected to the lower end of the first vertical channel, and the upper end of the first vertical channel is connected to the second air hole.

4. A cylinder for a needle valve hot runner according to claim 1, characterized in that, The second ventilation channel includes a second vertical channel and a second inclined channel; the piston is provided with a third air hole and a fourth air hole, the third air hole being located at the top of the piston plate; the fourth air hole being located at the upper end of the piston; the second vertical channel is arranged inside the piston along the axial direction of the piston, the second inclined channel is inclinedly arranged on the piston plate, one end of the second inclined channel is connected to the third air hole, the other end of the second inclined channel is connected to the lower end of the second vertical channel, and the upper end of the second vertical channel is connected to the fourth air hole.

5. A cylinder for a needle valve hot runner according to claim 1, characterized in that, The boss is provided with a first annular sealing groove, and a first sealing ring is installed in the first annular sealing groove.

6. A cylinder for a needle valve hot runner according to claim 1, characterized in that, The sidewalls of both the piston plate and the piston gasket are provided with a second annular sealing groove, and a second sealing ring is installed in the second annular sealing groove.

7. A cylinder for a needle valve hot runner according to claim 1, characterized in that, The second cylinder includes an integrally formed cylinder body and a connecting cap; The upper end of the accommodating space is provided with an installation port, and the connecting cover is detachably connected to the installation port so that the cylinder body is fixed in the accommodating space; The cylinder body and the connecting cover are provided with a third annular sealing groove, and a third sealing ring is installed in the third annular sealing groove.

8. A cylinder for a needle valve hot runner according to claim 1, characterized in that, The bottom of the first cylinder is provided with a sliding hole, and the lower end of the piston is slidably fitted into the sliding hole; the side wall of the sliding hole is provided with a fourth annular sealing groove, and a fourth sealing ring is installed in the fourth annular sealing groove; the ventilation hole is provided on the outer periphery of the sliding hole; A connecting platform extends downward from the outer edge of the sliding hole. The connecting platform is embedded in the piston through hole, and the side wall of the connecting platform is provided with a fifth annular sealing groove. A fifth sealing ring is installed in the fifth annular sealing groove.

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