A needle valve pad structure for a needle valve nozzle

Abstract

The present application belongs to the technical field of needle valve nozzle, and in particular to a needle valve gasket structure of needle valve nozzle, which comprises a needle valve gasket structure formed by a gasket assembly and a material discharger. The gasket of the gasket assembly is fixedly embedded in a mounting cavity formed on a valve nozzle. The material discharger is inserted into a material discharging channel formed on the gasket through a plug-in hole formed on the valve nozzle. A material discharging ring is fixedly sleeved on a valve needle. In the present application, the material discharger is installed on the needle valve to remove the trace of waste material entering the gasket. During operation, the waste material brought into the gasket cavity by the valve needle during movement will enter the material collecting ring groove under the pushing of the material discharging ring, and then enter the material discharger through the material discharging channel for discharge. At the same time, the waste material in the gasket cavity is more effectively cleaned by the pushing of the material discharging ring, achieving the purpose of smooth discharge of waste material, realizing the cleaning and removal of waste material, effectively avoiding the accumulation of waste material in the cavity of the gasket, and ensuring the stable operation of the needle valve for a long time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of needle valve nozzle, in particular to a needle valve gasket structure of needle valve nozzle. BACKGROUND

[0002] Hot runner is a heating assembly used in injection mold to inject molten plastic into the cavity of the mold. The hot runner system is generally composed of a hot nozzle, a distributor, a temperature control box and accessories. The hot runner system is divided into an open hot runner system and a needle valve hot runner system. According to different product raw materials, appearance and performance requirements, the corresponding hot runner system that meets the requirements is selected, and the corresponding nozzle form is selected. In the needle valve hot runner system, the valve needle is usually driven to move by a cylinder, so that the valve needle is attached to the gate parting surface. Then, through the control of the cylinder, the valve needle can be driven to move, and the opening and closing of the gate can be controlled.

[0003] In the commonly used needle valve nozzle, the needle valve gasket is connected with the distributor in the valve nozzle, and the valve needle passes through the needle valve gasket. There is a gap between the valve needle and the distributor in the valve nozzle. During the movement of the valve needle, a small amount of plastic is brought out and overflowed into the cavity of the needle valve gasket. After a period of time, a large amount of plastic brought out by the valve needle will accumulate in the cavity. Since the accumulated plastic cannot be discharged, it will affect the movement of the valve needle after solidification, so that the entire needle valve cannot be used normally. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides a needle valve gasket structure of a needle valve nozzle, which solves the problem that during the movement of the needle valve, a small amount of plastic is easily brought into the cavity of the needle valve gasket, the accumulated plastic in the cavity cannot be discharged, and it will affect the movement of the valve needle after solidification, so that the entire needle valve cannot be used normally.

[0006] (II) Technical solutions

[0007] In order to achieve the above purpose, the present application specifically adopts the following technical solutions:

[0008] A needle valve gasket structure of a needle valve nozzle, comprising a needle valve gasket structure formed by a gasket assembly and a material discharger, the gasket assembly comprising a gasket and a material discharge ring piece arranged in cooperation with each other, the gasket being fixedly embedded in a mounting cavity formed in the valve nozzle, and the material discharger being inserted into a material discharge channel formed in the gasket through a plug-in hole formed in the valve nozzle, the material discharge channel being in communication with a material collecting ring groove formed at the bottom of the matching cavity of the gasket, and the material discharge ring piece being fixedly sleeved on the valve needle, and the material discharge ring piece being arranged in cooperation with the matching cavity of the gasket.

[0009] Further, the adapter cavity of the gasket is provided with a through hole, the valve needle is inserted into the through hole of the gasket, and the adapter cavity is provided with an inclined platform which is matched with the adapter inclined surface of the lower part of the discharging ring piece, and the discharging channels are arranged in an annular array around the collecting ring groove, the discharging channels are arranged at one end of the gasket outside the discharging device, the through hole is arranged at the middle part of the discharging ring piece and matched with the valve needle, the valve needle is provided with a limiting stopper at the sleeved part corresponding to the discharging ring piece, the gasket and the discharging ring piece are combined to form the whole valve needle, the gasket is used for plugging in the use process, so that the connecting part of the valve needle and the material conveying channel in the valve nozzle is plugged, the material is prevented from entering the cavity of the valve nozzle for installing the valve needle, the stable operation and use of the needle valve are ensured, and the discharging ring piece is used as a pushing member for pushing and extruding the waste material in the gasket, so that the waste material in the adapter cavity of the gasket can be smoothly discharged.

[0010] Further, the discharging device is integrally provided with an annular end at one end of the valve nozzle, the annular end is embedded in the counterbore at the outer end part of the insertion hole of the valve nozzle, the annular end is provided with annularly arranged clamping grooves, the annular end is provided with a sealing groove matched with a sealing washer at the end in contact with the counterbore, the sealing washer is arranged between the annular end and the bottom wall of the counterbore, the discharging device is provided with a through flow channel, the flow channel is through the discharging channel, the insertion hole arranged on the side wall of the valve nozzle is used for installing the discharging device, the discharging device is installed on the valve nozzle in the form of insertion, the discharging device can be quickly disassembled and assembled in the use process, the maintenance of the discharging device in the use process is facilitated, the insertion hole and the discharging device are matched and used together, the waste material in the plugging gasket in the valve nozzle is smoothly discharged, and the valve nozzle can be stably used for a long time.

[0011] Further, the discharging device is integrally provided with an annular end at one end of the valve nozzle, the annular end is embedded in the counterbore at the outer end part of the insertion hole of the valve nozzle, the annular end is provided with annularly arranged clamping grooves, the annular end is provided with a sealing groove matched with a sealing washer at the end in contact with the counterbore, the sealing washer is arranged between the annular end and the bottom wall of the counterbore, the discharging device is provided with a through flow channel, the flow channel is through the discharging channel, the insertion hole arranged on the side wall of the valve nozzle is used for installing the discharging device, the discharging device is installed on the valve nozzle in the form of insertion, the discharging device can be quickly disassembled and assembled in the use process, the maintenance of the discharging device in the use process is facilitated, the insertion hole and the discharging device are matched and used together, the waste material in the plugging gasket in the valve nozzle is smoothly discharged, and the valve nozzle can be stably used for a long time.

[0012] Further, the outer wall of the valve nozzle is sleeved with a collecting groove ring, the collecting groove ring is arranged below the discharging device at the outer end of the valve nozzle, and the collecting groove ring is provided with an annular groove, so as to arrange a collector on the outer wall of the valve nozzle to collect the discharged waste material, facilitate the subsequent quick cleaning, ensure the cleanliness of the valve nozzle, and stably use the valve nozzle.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, the needle valve gasket structure of the needle valve nozzle has the following advantages

[0015] Beneficial Effects

[0016] The present application installs the material discharging device for discharging the trace waste material into the gasket on the needle valve. During operation, the waste material brought into the gasket cavity by the valve needle during movement will be pushed into the material collecting ring groove by the pushing of the material discharging ring piece, and then enter the material discharging device through the material discharging channel for discharge. At the same time, the waste material in the gasket cavity is more effectively cleaned by the pushing of the material discharging ring piece, so as to achieve the purpose of smooth discharge of waste material and realize the cleaning and discharge of waste material, effectively avoiding the accumulation of waste material in the cavity of the gasket, and ensuring the long-term stable operation of the needle valve. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the present application;

[0018] Figure 2 is an exploded view of the present application;

[0019] Figure 3 is a sectional view of the valve nozzle in the present application;

[0020] Figure 4 is a sectional view of the gasket in the present application;

[0021] Figure 5 is a sectional view of the material discharging ring piece in the present application;

[0022] Figure 6 is a sectional view of the material discharging device in the present application.

[0023] In the figure: 1, valve nozzle; 101, pipeline connecting seat; 102, plug-in hole; 103, installation cavity; 104, material conveying channel; 105, material inlet channel; 2, valve needle; 3, gasket assembly; 301, gasket; 3011, fitting cavity; 3012, inclined table top; 3013, material collecting ring groove; 3014, material discharging channel; 302, material discharging ring piece; 3021, fitting inclined surface; 4, material discharging device; 401, annular end; 402, material flow channel; 403, clamping groove; 404, sealing groove; 5, material collecting groove ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0025] Embodiments

[0026] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, one embodiment of the present application provides a needle valve pad structure of a needle valve nozzle, which comprises a needle valve pad structure formed by the combination of a pad assembly 3 and a discharger 4. The pad assembly 3 comprises a gasket 301 and a discharging ring 302 arranged in cooperation with each other. The cooperation between the two facilitates the smooth completion of the cleaning and discharging operation of the material in the gasket 301 during use. At the same time, the pad assembly 3 is used to block the end of the connection part of the valve needle 2 and the material conveying channel 104 on the valve nozzle 1, so that the material entering the material conveying channel 104 from the feeding channel 105 cannot leak out from this part, ensuring smooth conveying of the material, so that the valve nozzle 1 of the needle valve can be used stably. The gasket 301 is fixedly embedded in the installation cavity 103 opened on the valve nozzle 1. The lower part of the gasket 301 is provided in a circular conical shape. The conical surface cooperates with the conical matching surface at the bottom of the installation cavity 103. The conical surfaces of the two are in contact with each other. The conical surface expands the contact area between the two, improves the sealing efficiency, ensures effective sealing during use, facilitates stable installation of the gasket 301 on the valve nozzle 1, and effectively seals the end of the material conveying channel 104, so that the needle valve 2 can be smoothly matched with the material conveying channel 104 on the valve nozzle 1, so that the entire needle valve can be used smoothly. The discharger 4 is inserted into the discharging channel 3014 opened on the gasket 301 through the insertion hole 102 opened on the valve nozzle 1. The discharger 4 is stably installed on the needle valve by cooperation between the insertion hole 102 and the discharging channel 3014, so that the discharger 4 can smoothly discharge the waste material in the gasket 301 into the discharging channel 3014, ensuring the cleanliness of the matching cavity 3011 in the gasket 301, ensuring the stable operation of the needle valve for a long time. The discharging channel 3014 is in communication with the material collecting ring groove 3013 opened at the bottom of the matching cavity 3011 on the gasket 301. The waste material entering the matching cavity 3011 is collected and accumulated in the material collecting ring groove 3013, and then discharged into the discharging channel 3014, achieving smooth discharging of the waste material. The discharging channel 3014 is stably connected to the gasket 301 by the discharging channel 3014, realizing the communication between the material conveying channel 402 on the discharger 4 and the discharging channel 3014, achieving smooth discharge of the waste material. At the same time, the discharging ring 302 is fixedly sleeved on the valve needle 2. The discharging ring 302 is arranged in cooperation with the matching cavity 3011 of the gasket 301, so that the discharging ring 302 can be stably installed on the valve needle 2, so that the valve needle 2 can smoothly move together with the discharging ring 302. During movement, the discharging ring 302 slides in the matching cavity 3011 of the gasket 301, thereby pushing and extruding the waste material in the matching cavity 3011 to discharge, achieving discharging of the waste material. During use, the installation port 103 of the valve nozzle 1 is threadedly connected to the installation seat of the valve needle 2, and a gasket for sealing is arranged at the connection part of the two.The gap at the connecting part is sealed to ensure stable use. The cylinder driving the valve needle 2 is installed on the mounting seat, and the output end of the cylinder is fixedly connected with one end of the valve needle 2. During operation, the valve needle 2 is driven to move in the valve nozzle 1 by the operation of the cylinder, so that the valve needle 2 is slidingly inserted into the material conveying channel 104 of the valve nozzle 1, and when the valve needle 2 moves to the position of the material conveying channel 105, the communication part between the material conveying channel 104 and the material conveying channel 105 is sealed by the valve needle 2, so that the valve nozzle 1 is closed to prevent material from passing through the valve nozzle 1. During the resetting of the valve needle 2, the material conveying channel 104 and the material conveying channel 105 are communicated, and the material can enter the material conveying channel 104 from the material conveying channel 105. At this time, the valve nozzle 1 can convey the material, and the material can smoothly pass through the material conveying pipeline and the material conveying channel 105 into the material conveying channel 104, and then be discharged from the valve nozzle 1. During the movement of the valve needle 2, a small amount of material enters the cavity of the gasket 301 between the sealing valve needle 2 and the material conveying channel 104. During the opening and closing of the needle valve, the reciprocating movement of the valve needle 2 accumulates a large amount of material in the cavity of the gasket 301. During the movement of the valve needle 2, the discharge ring 302 moves, and when the discharge ring 302 moves to the cavity of the gasket 301, the discharge ring 302 acts as a piston to push and extrude the material in the cavity to the material collecting groove 3013, so as to keep the cavity of the gasket 301 clean. The material in the material collecting groove 3013 enters the flow channel 402 of the material discharger 4 from the discharge channel 3014, and is smoothly discharged from the material collecting groove 3013, effectively preventing the material accumulated in the cavity of the gasket 301 from solidifying and affecting the movement of the valve needle 2, so as to ensure the smooth operation of the needle valve for a long time. The material discharged from the material discharger 4 falls into the material collecting groove 5 arranged on the outer wall of the valve nozzle 1, and is temporarily collected and stored, so as to prevent the discharged material from flowing on the outer wall of the valve nozzle 1, ensure the smooth material conveying of the valve nozzle 1, and clean the material accumulated in the material collecting groove 5 after a period of use, so as to quickly complete the cleaning operation and ensure long-term stable operation. The material collecting groove 5 is arranged as an integral annular groove, which can be directly sleeved on the outer wall of the valve nozzle 1 during installation, and limiting bolts are arranged at the bottom of the material collecting groove 5. After installation, the limiting bolts are screwed to fix the material collecting groove 5 at the use position. The material collecting groove 5 can also be arranged as an annular groove formed by two half-annular grooves. The end contact parts of the two half-annular grooves are arranged with a gasket to seal the gap at the connecting part, so that the combined annular groove can stably collect and store waste materials, and prevent waste materials from leaking from the gap between the two half-annular grooves. Limiting bolts are arranged on the two half-annular grooves to limit and fix the entire material collecting groove 5 after installation.The sealing bush is arranged between the aggregate tank ring 5 and the outer wall of the valve nozzle 1 to seal the gap and ensure stable connection of the two.

[0027] As Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in some embodiments, the adapter cavity 3011 of the gasket 301 is provided with a through hole at the bottom, and the adapter cavity 3011 is provided to facilitate the cooperation of the gasket 301 and the discharge ring 302, and then the movement of the valve needle 2 drives the discharge ring 302 to move up and down in the adapter cavity 3011 of the gasket 301, so that the discharge ring 302 acts as a piston, and the waste material in the adapter cavity 3011 is pushed into the collection ring groove 3013 at the lower part of the adapter cavity 3011, and then flows into the discharge channel 3014 from the collection ring groove 3013, thereby completing the smooth discharge operation of the waste material. The valve needle 2 is inserted through the through hole in the gasket 301, which facilitates the smooth movement of the valve needle 2 on the gasket 301, ensures that the valve needle 2 can pass through the adapter cavity 3011 and be inserted into the material conveying channel 104 of the valve nozzle 1 to effectively block it, and the bottom of the adapter cavity 3011 is provided with an inclined platform 3012, which is cooperatively arranged with the adapter inclined surface 3021 at the lower part of the discharge ring 302. The cooperation between the inclined platform 3012 and the adapter inclined surface 3021 ensures that all the waste material entering the adapter cavity 3011 is pushed and extruded into the collection ring groove 3013, effectively avoiding the residual waste material in the adapter cavity 3011, ensuring the cleanliness of the gasket 301, and achieving stable use. The discharge channel 3014 is arranged in an annular array around the collection ring groove 3013, which ensures the smooth flow and discharge of the waste material in the collection ring groove 3013, and is cooperatively arranged with the discharge device 4 one by one to achieve the smooth discharge of the waste material in the gasket 301. The discharge channel 3014 is cooperatively arranged with one end of the discharge device 4 at one end outside the gasket 301, and is divided into two sections. One end of the discharge channel 3014, which is in communication with the collection ring groove 3013, serves as a material flow channel and cooperates with the flow channel 402 to enable the waste material to flow smoothly into the discharge device 4, thereby connecting the collection ring groove 3013 and the flow channel 402 of the discharge device 4 to achieve the purpose of smooth discharge of the waste material. The other section of the discharge channel 3014 has the same outer diameter as the discharge device 4, so that the end of the discharge device 4 can be stably inserted into this section of the discharge channel 3014, thereby achieving stable installation of the discharge device 4. The inner wall of the variable diameter part of the discharge channel 3014 at the end of the discharge device 4 is tightly fitted together, and an outwardly protruding sealing ridge is provided on the outer wall of the end of the discharge device 4. During installation, the sealing ridge on the end of the discharge device 4 is in contact with the inner wall of the variable diameter part of the discharge channel 3014, thereby sealing the gap between the two contact parts to prevent the waste material from leaking out of the gap, ensuring the smooth discharge of the waste material in the adapter cavity 3011 of the gasket 301. The through hole in the middle part of the discharge ring 302 is cooperatively arranged with the valve needle 2, and a limiting stopper is provided on the valve needle 2 corresponding to the sleeved part of the discharge ring 302, so that the discharge ring 302 forms a structure similar to a sleeve and can be stably installed on the valve needle 2.And the stop on the valve needle 2 between the two limit, so that the two stable connection together, so that the valve needle 2 can take with the discharge ring piece 302 together with the stable up and down movement, to the gasket 301 on the adaptive cavity 3011 in the smooth cleaning operation of waste materials, to ensure that the gasket 301 can be stable use.

[0028] As Figure 1 , Figure 2 and Figure 6 shown, in some embodiments, the discharger 4 is located at one end of the valve nozzle 1 integral with the annular end 401, the annular end 401 is embedded in the counterbore at the outer port part of the insertion hole 102, the whole discharger 4 is stably installed on the valve nozzle 1 by the cooperation between the annular end 401 and the counterbore, ensuring stable use, smoothly discharging the waste materials remaining in the gasket 301, avoiding the waste materials remaining in the gasket 301, ensuring the stable and smooth operation of the whole needle valve, and the annular end 401 is provided with a clamping groove 403 arranged in an annular array, which facilitates clamping with auxiliary tools during disassembly and assembly, so as to smoothly install or disassemble the discharger 4 on the valve nozzle 1, improving the convenience of operation, the annular end 401 is provided with a sealing groove 404 matched with the sealing washer at the end of the counterbore, improving the fitting degree between the sealing washer and the discharger 4, and stably connecting the two together, the sealing washer is arranged between the annular end 401 and the bottom wall of the counterbore, and the gap between the discharger 4 and the insertion hole 102 is blocked by the sealing washer, improving the stability of the connection between the two, ensuring stable use, the sealing washer is provided with an outwardly protruding annular sealing ring on both sides, the outwardly protruding annular sealing ring on one side of the sealing washer is embedded in the annular groove arranged at the bottom of the sealing groove 404, and the outwardly protruding annular sealing ring on the other side of the sealing washer is embedded in the annular groove arranged in the counterbore at the end of the insertion hole 102, improving the sealing performance and achieving stable sealing, while also improving the stability of the installation of the discharger 4, the discharger 4 is provided with a through flow channel 402, the flow channel 402 is communicated with the discharge channel 3014, the waste materials entering the discharge channel 3014 are smoothly guided into the flow channel 402, and then smoothly discharged from the discharger 4, completing the discharge operation of the waste materials.

[0029] As Figure 2 and Figure 3As shown, in some embodiments, the bottom of the cavity 103 of the valve nozzle 1 is provided with a material conveying channel 104, and the bottom end of the material conveying channel 104 is provided with a discharge nozzle as a discharge outlet. During use, the discharge nozzle at the end of the valve nozzle 1 can be inserted into the injection port of the injection mold to be used, and the material can be injected into the injection mold through the valve nozzle 1 to complete the injection material conveying operation. The material in the valve nozzle 1 is smoothly discharged through the material conveying channel 104 to complete the material conveying operation. The valve needle 2 passing through the installation cavity 103 can be inserted into the material conveying channel 104. The material conveying channel 104 is in communication with the installation cavity 103 and cooperates with the valve needle 2 to facilitate smooth sliding of the valve needle 2 in the material conveying channel 104, smooth operation of the valve body switch during use, and sealing of the material conveying channel 104. The valve nozzle 1 is integrally provided with a pipeline connecting seat 101 on one side. The outer wall of the end of the pipeline connecting seat 101 is provided with an outwardly protruding stop protruding ring, which cooperates with the limiting member to limit the pipeline, so that the pipeline can be stably installed on the pipeline connecting seat 101 to ensure stable use. The stop protruding ring at the end of the pipeline connecting seat 101 can be provided as a flange, which cooperates with the pipeline connecting member at the end of the pipeline to stably connect the pipeline to the valve nozzle 1 to achieve effective installation of the material conveying pipeline. The material conveying pipeline facilitates material conveying. The pipeline connecting seat 101 is provided with a feeding channel 105. One end of the feeding channel 105 is in communication with the material conveying channel 104 to facilitate the diversion of the material from the feeding channel 105 to the material conveying channel 104, thereby smoothly completing the material conveying operation. The valve nozzle 1 is fixedly connected with the valve needle 2 installation seat. The installation seat is used to drive the valve needle 2 to achieve opening and closing operation of the valve nozzle 1 to control the material conveying control.

[0030] As shown in Figure 1 and Figure 2 In some embodiments, the outer wall of the valve nozzle 1 is provided with a material collecting groove ring 5 to ensure stable installation of the material collecting groove ring 5 on the valve nozzle 1 to achieve stable use. The material collecting groove ring 5 is also convenient for quick disassembly and assembly operation. During use, the material collecting groove ring 5 can be quickly removed for cleaning. The material collecting groove ring 5 is arranged below the discharge device 4 at the outer end of the valve nozzle 1. The material collecting groove ring 5 is provided with an annular groove. The material collecting groove ring 5 serves as a waste material collecting and storing vessel and is installed below the discharge device 4 to facilitate collection of the waste material discharged from the discharge device 4 in the groove for temporary storage to avoid smooth flow on the outer wall of the valve nozzle 1 and ensure cleanliness during use of the valve nozzle 1 for stable use.

[0031] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A needle valve pad structure of a needle valve nozzle, comprising a needle valve pad structure formed in combination of a pad assembly (3) and a discharger (4), characterized in that: The gasket assembly (3) comprises a gasket (301) and a discharging ring (302) arranged in cooperation, the gasket (301) is fixedly embedded in the installation cavity (103) formed on the valve nozzle (1), and the discharger (4) is inserted into the discharging channel (3014) formed on the gasket (301) through the insertion hole (102) formed on the valve nozzle (1), the discharging channel (3014) is in communication with the material collecting ring groove (3013) formed at the bottom of the matching cavity (3011) of the gasket (301), and the discharging ring (302) is fixedly sleeved on the valve needle (2), and the discharging ring (302) is arranged in cooperation with the matching cavity (3011) of the gasket (301). The bottom of the matching cavity (3011) of the gasket (301) is provided with a through hole in communication therewith, the valve needle (2) is inserted through the through hole of the gasket (301), and the bottom of the matching cavity (3011) is provided with an inclined platform (3012), the inclined platform (3012) is arranged in cooperation with the matching inclined surface (3021) of the lower part of the discharging ring (302), and the discharging channels (3014) are arranged in an annular array around the material collecting ring groove (3013), and the discharging channels (3014) are arranged at one end outside the gasket (301) and one end of the discharger (4). The discharger (4) is integrally provided with an annular end (401) at one end of the valve nozzle (1), the annular end (401) is embedded in the counterbore at the outer end of the insertion hole (102) of the valve nozzle (1), the annular end (401) is provided with annularly arranged clamping grooves (403), the end of the annular end (401) in contact with the counterbore is provided with a sealing groove (404) matched with a sealing gasket, and the sealing gasket is arranged between the annular end (401) and the bottom wall of the counterbore. The discharger (4) is provided with a through flow channel (402), and the flow channel (402) is in communication with the discharging channel (3014). The through hole formed in the middle part of the discharging ring (302) is arranged in cooperation with the valve needle (2), and the valve needle (2) is provided with a limiting stopper at the sleeving position corresponding to the discharging ring (302).

2. A needle valve bushing structure for a needle valve nozzle according to claim 1, characterized in that: The bottom of the installation cavity (103) of the valve nozzle (1) is provided with a material conveying channel (104), the material conveying channel (104) is in communication with the installation cavity (103) and arranged in cooperation with the valve needle (2), one side of the valve nozzle (1) is integrally provided with a pipeline connecting seat (101), the pipeline connecting seat (101) is provided with a material inlet channel (105), one end of the material inlet channel (105) is in communication with the material conveying channel (104), and the valve nozzle (1) and the installation seat of the valve needle (2) are fixedly connected.

3. A needle valve bushing structure for a needle valve nozzle as defined in claim 1, characterized by: The outer wall of the valve nozzle (1) is sleeved with a material collecting groove ring (5), the material collecting groove ring (5) is arranged below the discharger (4) at the outer end of the valve nozzle (1), and the material collecting groove ring (5) is provided with an annular recess.

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