Spraying device for gear box manufacturing process

Abstract

The invention discloses a spraying device for a gearbox manufacturing process, a nozzle comprises a first shell, a second shell, a nozzle cap and a nozzle core, the nozzle cap is mounted at the lower end of the second shell, and the nozzle core is mounted in the lower end of the second shell and located on the inner side of the nozzle cap; the device is characterized in that an elastic diaphragm is installed at the joint of the first shell and the second shell in a sealed mode, a gas pressure cavity G1 is formed between the elastic diaphragm and the first shell, and a liquid pressure cavity G2 is formed between the elastic diaphragm and the second shell; the first shell is provided with an air inlet hole, a first channel, a second channel and a valve cavity, the second shell is provided with a liquid inlet hole, a third channel and a fourth channel, and a one-way adjusting valve is installed in the valve cavity. Compressed gas is input through the gas inlet hole, and / or liquid is input through the liquid inlet hole, so that the elastic diaphragm deforms, the volumes of the pressure cavity G1 and the pressure cavity G2 are changed, and the fluid pressure / fluid flow state at the injection outlet can be adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying devices used in gear box manufacturing processes, and in particular to a spraying device used in gear box manufacturing processes. Background Art

[0002] Existing spray devices used in gearbox manufacturing processes are used to spray paint, rust inhibitors, preservatives, and other coatings, oils, or treatment fluids during the gearbox manufacturing process. The spray devices include a nozzle comprising a first housing, a second housing, a nozzle cap, and a nozzle core. However, existing spray nozzles still suffer from poor pressure chamber volume adjustability, poor gas and / or liquid pressure / fluid flow adjustability at the spray outlet, and the need for further improvement in spray uniformity and precision. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a spraying device for a gearbox manufacturing process. Through the innovative design of the nozzle structure, the pressure of the compressed gas input through the air inlet and / or the liquid input through the liquid inlet is different, so that the elastic diaphragm is deformed and the volume of the pressure chamber G1 and the pressure chamber G2 is changed, thereby being able to adjust the pressure / fluid flow state of the gas and / or liquid at the nozzle cap injection outlet and / or the nozzle core injection outlet; and being able to achieve uniform and precise spray / atomized injection.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A spraying device for a gearbox manufacturing process, the spraying device is used to spray paint, rust inhibitor, preservative and other coatings or oil or treatment fluid during the gearbox manufacturing process, the spraying device includes a nozzle, the nozzle including a first housing, a second housing, a nozzle cap, and a nozzle core. The nozzle cap is mounted on the lower end of the second housing, and the nozzle core is mounted inside the lower end of the second housing and inside the nozzle cap. The device is characterized in that an elastic diaphragm is sealed at the connection between the first and second housings, a gas pressure chamber G1 is formed between the elastic diaphragm and the first housing, and a liquid pressure chamber G2 is formed between the elastic diaphragm and the second housing. The first housing is provided with an air inlet, a first channel, a second channel, and a valve chamber, and the second housing is provided with a liquid inlet, a third channel, and a fourth channel. A one-way regulating valve is mounted in the valve chamber, and compressed gas flows sequentially through the air inlet, pressure chamber G1, valve chamber, first channel, second channel, fourth channel, and third channel to the nozzle cap ejection outlet, and liquid flows sequentially through the liquid inlet and pressure chamber G2 to the nozzle core ejection outlet.

[0006] Furthermore, the pressures of the compressed gas input through the air inlet and / or the liquid input through the liquid inlet are different, causing the elastic diaphragm to deform and the volumes of the pressure chamber G1 and the pressure chamber G2 to change, thereby being able to adjust the pressure / fluid flow of the gas and / or liquid at the nozzle cap injection outlet and / or the nozzle core injection outlet.

[0007] Furthermore, the air inlet hole is arranged parallel to the first channel, the liquid inlet hole, and the third channel, and the second channel and the fourth channel are arranged collinearly; the air inlet hole and the liquid inlet hole are arranged on the right side of the elastic diaphragm, and the first channel, the second channel, the third channel, and the fourth channel are arranged on the left side of the elastic diaphragm.

[0008] Furthermore, a sealing flange is provided on the outer periphery of the elastic diaphragm, and the sealing flange is respectively embedded in the corresponding sealing grooves on the first shell and the second shell; a second sealing element is also installed between the first shell and the second shell.

[0009] Furthermore, the one-way regulating valve includes a valve core, a first spring, and an adjusting screw. One end of the first spring is connected to the valve core, and the other end is connected to the adjusting screw. The valve core moves under the pressure of the gas to control the on and off of the valve cavity. The adjusting screw is screwed into the valve cavity to different depths so that the opening pressure of the first spring on the valve core is different.

[0010] Furthermore, an adjustment component is provided in the pressure chamber G1, and the adjustment component includes a connecting plate, a second spring, a connecting screw, and a nut. One end of the second spring is connected to the upper side wall of the pressure chamber G1, and the other end is connected to the connecting plate. The connecting screw is fixedly connected to the elastic diaphragm, and the connecting plate is threadedly connected to the connecting screw. A nut is connected to the connecting screw. A groove is provided on the upper surface of the connecting plate, and the nut is arranged in the groove. By adjusting the installation position of the connecting plate on the connecting screw, the second spring can apply different pressures to the elastic diaphragm. Under a certain gas pressure or liquid pressure, the elastic diaphragm bends and deforms, so that the volume of the pressure chamber G1 and the pressure chamber G2 changes, thereby being able to adjust the gas and / or liquid pressure / fluid flow state at the nozzle cap injection outlet and / or the nozzle core injection outlet accordingly.

[0011] Furthermore, the nozzle cap includes a cap outlet hole and a cap shoulder. A cap outlet hole is opened at the center of the bottom end of the nozzle cap, and a cap shoulder is provided on the outer peripheral surface. The cap shoulder is matched and connected with the lower end portion of the second shell; the nozzle core includes a central channel, a second through hole, a core outlet hole, and a core shoulder. A core outlet hole is opened at the center of the bottom end of the nozzle core, and a core shoulder is provided on the outer peripheral surface. The core shoulder is matched and connected with the lower end portion of the second shell, and a plurality of second through holes distributed along the circumferential direction are opened on the upper part of the nozzle core and are connected with the central channel.

[0012] Furthermore, a convex portion is provided on the second shell, which is located in the pressure chamber G2, and the upper part of the nozzle core is located in the convex portion. A first annular cavity is formed between the outer peripheral surface of the upper part of the nozzle core and the convex portion. A plurality of first through holes distributed along the circumferential direction are provided on the outer peripheral wall of the convex portion. The two ends of the first through hole are respectively connected to the pressure chamber G2 and the first annular cavity, and the two ends of the second through hole are respectively connected to the first annular cavity and the central channel; the liquid can enter the central channel through the first through hole, the first annular cavity, and the second through hole, and directly enter the central channel from the pressure chamber G2, thereby being able to adjust the fluid flow state of the liquid entering the central channel.

[0013] Furthermore, the axis of the adjusting screw is arranged colinearly with the axis of the nozzle core, and the axis of the adjusting screw is arranged perpendicular to the axis of the air inlet; a second annular cavity is formed between the lower end of the second shell and the core shoulder and the upper end of the nozzle cap, and an outer channel is formed between the outer peripheral surface of the lower end of the nozzle core and the inner peripheral surface of the lower end of the nozzle cap, and the liquid flows through the third channel, the second annular cavity, and the outer channel in sequence to the injection outlet of the nozzle cap.

[0014] Furthermore, the axis of the cap outlet hole is collinear with the axis of the core outlet hole, and the aperture of the cap outlet hole is 1.2-2.5 times the aperture of the core outlet hole, which can improve the spray uniformity and precision of the nozzle.

[0015] The present invention provides a spraying device for a gearbox manufacturing process. Through an innovative design of the nozzle structure, the pressures of the compressed gas input through the air inlet and / or the liquid input through the liquid inlet are different, causing the elastic diaphragm to deform and the volume of the pressure chamber G1 and the pressure chamber G2 to change, thereby being able to adjust the pressure / fluid flow of the gas and / or liquid at the nozzle cap injection outlet and / or the nozzle core injection outlet.

[0016] The present invention enables the second spring to apply different pressures to the elastic diaphragm by adjusting the installation position of the connecting plate on the connecting screw. Under a certain gas pressure or liquid pressure, the elastic diaphragm bends and deforms, causing the volume of the pressure chamber G1 and the pressure chamber G2 to change, thereby correspondingly adjusting the gas and / or liquid pressure / fluid flow state at the nozzle cap injection outlet and / or the nozzle core injection outlet.

[0017] The present invention can realize uniform and precise spraying / atomization injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a spraying device used in a gearbox manufacturing process according to the present invention;

[0019] Figure 2 The figure is a schematic structural diagram of the spraying device used in the gearbox manufacturing process of the present invention.

[0020] In the figure: the first shell 1, the second shell 2, the nozzle cap 3, the nozzle core 4, the one-way regulating valve 5, the elastic diaphragm 6, the regulating assembly 7, the air inlet 11, the first channel 12, the second channel 13, the valve chamber 14, the liquid inlet 21, the third channel 22, the fourth channel 23, the convex cylinder 24, the first through hole 25, the first annular cavity 26, the cap outlet hole 31, the cap shoulder 32, the central channel 41, the second through hole 42, the core outlet hole 43, the core shoulder 44, the valve core / ball core 51, the first spring 52, the adjusting screw 53, the connecting plate 71, the second spring 72, the connecting screw 73, the nut 74, the second annular cavity S1, the outer channel S2, the gas pressure chamber G1, and the liquid pressure chamber G2. DETAILED DESCRIPTION

[0021] To make the technical solution and its advantages of the present invention more clear, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, the accompanying drawings only show the parts / structures related to the present invention. Other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0022] All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention. Furthermore, unless otherwise defined, technical or scientific terms used in the description of the present invention shall have the same meanings as those generally understood by persons of ordinary skill in the art to which the present invention belongs.

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] like Figure 1-2As shown, a spraying device for a gearbox manufacturing process is used to spray paint, rust inhibitor, preservative and other coatings or oil or treatment liquid during the gearbox manufacturing process. The spraying device includes a nozzle, and the nozzle includes a first shell 1, a second shell 2, a nozzle cap 3, and a nozzle core 4. The first shell 1 and the second shell 2 are matched and connected to form a nozzle shell, and the nozzle cap 3 is installed at the lower end of the second shell 2. The nozzle core 4 is installed inside the lower end of the second shell 2 and inside the nozzle cap 3; it is characterized in that: an elastic diaphragm 6 is sealed at the connection between the first shell 1 and the second shell 2, and a gas pressure chamber G1 is formed between the elastic diaphragm 6 and the first shell 1, and a liquid pressure chamber G2 is formed between the elastic diaphragm 6 and the second shell 2. The pressure chamber G1 and the pressure chamber G2 are isolated from each other / disconnected by an elastic diaphragm 6; the first shell 1 is provided with an air inlet hole 11, a first channel 12, a second channel 13, and a valve chamber 14, and the second shell 2 is provided with a liquid inlet hole 21, a third channel 22, and a fourth channel 23. A one-way regulating valve 5 is installed in the valve chamber 14. The compressed gas flows through the air inlet hole 11, the pressure chamber G1, the valve chamber 14, the first channel 12, the second channel 13, the fourth channel 23, and the third channel 22 to the injection outlet of the nozzle cap 3, and the liquid flows through the liquid inlet hole 21 and the pressure chamber G2 to the injection outlet of the nozzle core 4. Gas-liquid mixing is completed at the injection outlet of the nozzle cap 3 and / or the injection outlet of the nozzle core 4 to achieve uniform and precise spray / atomized injection.

[0025] In the present invention, the pressures of the compressed gas input through the air inlet 11 and / or the liquid input through the liquid inlet 21 are different, so that the elastic diaphragm 6 is deformed and the volumes of the pressure chamber G1 and the pressure chamber G2 are changed, thereby being able to adjust the pressure / fluid flow state of the gas and / or liquid at the injection outlet of the nozzle cap 3 and / or the injection outlet of the nozzle core 4.

[0026] The air inlet hole 11 is arranged parallel to the first channel 12, the liquid inlet hole 21, and the third channel 22, and the second channel 13 and the fourth channel 23 are arranged collinearly; the air inlet hole 11 and the liquid inlet hole 21 are arranged on the right side of the elastic diaphragm 6, and the first channel 12, the second channel 13, the third channel 22, and the fourth channel 23 are arranged on the left side of the elastic diaphragm 6.

[0027] Sealing flanges are provided on the outer periphery / both ends of the elastic diaphragm 6 , which are respectively embedded in corresponding sealing grooves on the first shell 1 and the second shell 2 ; one or more second sealing elements / sealing rings are also installed between the first shell 1 and the second shell 2 .

[0028] The one-way regulating valve 5 includes a valve core / ball core 51, a first spring 52, and an adjusting screw 53. One end of the first spring 52 is connected to the valve core 51, and the other end is connected to the adjusting screw 53. The valve core 51 operates under gas pressure to control the opening and closing of the valve chamber 14. The adjusting screw 53 is screwed into the valve chamber 14 to different depths, thereby varying the opening pressure of the first spring 52 on the valve core 51. The one-way regulating valve 5 can adjust the gas pressure and fluid flow in the second channel 13 and the third channel 22.

[0029] An adjustment assembly 7 is disposed within the pressure chamber G1. The adjustment assembly 7 includes a connecting plate 71, a second spring 72, a connecting screw 73, and a nut 74. One end of the second spring 72 is connected to the upper sidewall of the pressure chamber G1, and the other end is connected to the connecting plate 71. The connecting screw 73 is fixedly connected to the elastic diaphragm 6. The connecting plate 71 is threadedly connected to the connecting screw 73, and a nut 74 is connected to the connecting screw 73. The upper surface of the connecting plate 71 is provided with a groove, and the nut 74 is disposed within the groove. By adjusting the mounting position of the connecting plate 71 on the connecting screw 73, the second spring 72 can apply different pressures to the elastic diaphragm 6. Under a certain gas pressure or liquid pressure, the elastic diaphragm 6 bends and deforms, causing the volume of the pressure chambers G1 and G2 to change. Accordingly, the gas and / or liquid pressure / fluid flow pattern at the injection outlet of the nozzle cap 3 and / or the injection outlet of the nozzle core 4 can be adjusted.

[0030] The nozzle cap 3 includes a cap outlet hole 31 and a cap shoulder 32 . The cap outlet hole 31 is opened at the center of the bottom end of the nozzle cap 3 , and the cap shoulder 32 is provided on the outer peripheral surface. The cap shoulder 32 is matched and connected to the lower end of the second shell 2 .

[0031] The nozzle core 4 includes a central channel 41, a second through hole 42, a core outlet hole 43, and a core shoulder 44. A core outlet hole 43 is provided at the center of the bottom end of the nozzle core 4, and a core shoulder 44 is provided on the outer peripheral surface. The core shoulder 44 is matched and connected with the lower end portion of the second shell 2. A plurality of second through holes 42 distributed along the circumferential direction are opened on the upper part of the nozzle core 4 and are connected with the central channel 41.

[0032] A convex portion 24 is also provided on the second shell 2, and the convex portion 24 is located in the pressure chamber G2. The upper part of the nozzle core 4 is located in the convex portion 24, and a first annular cavity 26 is formed between the outer peripheral surface of the upper part of the nozzle core 4 and the convex portion 24. The outer peripheral wall of the convex portion 24 is provided with a plurality of first through holes 25 distributed along the circumferential direction. The two ends of the first through hole 25 are respectively connected to the pressure chamber G2 and the first annular cavity 26, and the two ends of the second through hole 42 are respectively connected to the first annular cavity 26 and the central channel 41; the liquid can enter the central channel 41 through the first through hole 25, the first annular cavity 26, and the second through hole 42, and directly enter the central channel 41 from the pressure chamber G2, so that the pressure / fluid flow state of the liquid entering the central channel 41 can be adjusted.

[0033] The axis of the adjusting screw 53 is arranged colinearly with the axis of the nozzle core 4 , and the axis of the adjusting screw 53 is arranged perpendicular to the axis of the air inlet hole 11 .

[0034] A second annular cavity S1 is formed between the lower end of the second shell 2 and the core shoulder 44 and the upper end of the nozzle cap 3. An outer channel S2 is formed between the outer circumferential surface of the lower end of the nozzle core 4 and the inner circumferential surface of the lower end of the nozzle cap 3. The liquid flows through the third channel 22, the second annular cavity S1, and the outer channel S2 in sequence to the injection outlet of the nozzle cap 3.

[0035] The axis of the cap outlet hole 31 is collinear with the axis of the core outlet hole 43 , and the aperture of the cap outlet hole 31 is 1.3-2.3 times the aperture of the core outlet hole 43 , which can improve the spray uniformity and precision of the nozzle.

[0036] The air inlet 11 is connected to a compressed air source, and the liquid inlet 21 is connected to paint, oil or processing liquid.

[0037] The present invention provides a spraying device for a gearbox manufacturing process. Through an innovative design of the nozzle structure, the pressures of the compressed gas input through the air inlet 11 and / or the liquid input through the liquid inlet 21 are different, causing the elastic diaphragm 6 to deform and the volumes of the pressure chambers G1 and G2 to change, thereby being able to adjust the pressure / fluid flow of the gas and / or liquid at the injection outlet of the nozzle cap 3 and / or the injection outlet of the nozzle core 4.

[0038] Through the innovative design of the nozzle structure, the present invention can enable the second spring 72 to apply different pressures to the elastic diaphragm 6 by adjusting the installation position of the connecting plate 71 on the connecting screw 73. Under a certain gas pressure or liquid pressure, the elastic diaphragm 6 bends and deforms, causing the volume of the pressure chamber G1 and the pressure chamber G2 to change, thereby correspondingly adjusting the gas and / or liquid pressure / fluid flow state at the injection outlet of the nozzle cap 3 and / or the injection outlet of the nozzle core 4.

[0039] The present invention can realize uniform and precise spraying / atomization injection through the innovative design of the nozzle structure.

[0040] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spraying device for a gearbox manufacturing process, the spraying device comprising a nozzle, the nozzle comprising a first housing (1), a second housing (2), a nozzle cap (3), and a nozzle core (4), the nozzle cap being mounted at the lower end of the second housing, and the nozzle core being mounted within the lower end of the second housing and located inside the nozzle cap; characterized in that: An elastic diaphragm (6) is sealed and installed at the connection between the first shell and the second shell, a gas pressure chamber G1 is formed between the elastic diaphragm and the first shell, and a liquid pressure chamber G2 is formed between the elastic diaphragm and the second shell; an air inlet hole (11), a first channel (12), a second channel (13), and a valve chamber (14) are provided on the first shell, a liquid inlet hole (21), a third channel (22), and a fourth channel (23) are provided on the second shell, and a one-way regulating valve (5) is installed in the valve chamber; compressed gas flows sequentially through the air inlet hole, the pressure chamber G1, the valve chamber, the first channel, the second channel, the fourth channel, and the third channel to the nozzle cap ejection outlet, and liquid flows sequentially through the liquid inlet hole and the pressure chamber G2 to the nozzle core ejection outlet.

2. A spraying device for a gearbox manufacturing process according to claim 1, characterized in that: The different pressures of the compressed gas input through the air inlet and / or the liquid input through the liquid inlet cause the elastic diaphragm to deform and the volume of the pressure chamber G1 and the pressure chamber G2 to change, thereby adjusting the pressure / fluid flow of the gas and / or liquid at the nozzle cap injection outlet and / or the nozzle core injection outlet.

3. A spraying device for a gearbox manufacturing process according to claim 2, characterized in that: The air inlet hole is arranged parallel to the first channel, the liquid inlet hole and the third channel, and the second channel and the fourth channel are arranged collinearly; the air inlet hole and the liquid inlet hole are arranged on the right side of the elastic diaphragm, and the first channel, the second channel, the third channel and the fourth channel are arranged on the left side of the elastic diaphragm.

4. A spraying device for a gearbox manufacturing process according to claim 2, characterized in that: The outer periphery of the elastic diaphragm is provided with a sealing flange, which is respectively embedded in the corresponding sealing grooves on the first shell and the second shell; a second sealing element is also installed between the first shell and the second shell.

5. The spraying device for gearbox manufacturing process according to claim 2, characterized in that: The one-way regulating valve comprises a valve core (51), a first spring (52), and an adjusting screw (53). One end of the first spring is connected to the valve core, and the other end is connected to the adjusting screw. The valve core moves under the pressure of gas to control the on-off of the valve cavity. The adjusting screw is screwed into the valve cavity to different depths so that the first spring exerts different opening pressures on the valve core.

6. A spraying device for a gearbox manufacturing process according to claim 5, characterized in that: An adjusting assembly (7) is provided in the pressure chamber G1, and the adjusting assembly includes a connecting plate (71), a second spring (72), a connecting screw (73), and a nut (74). One end of the second spring is connected to the upper side wall of the pressure chamber G1, and the other end is connected to the connecting plate. The connecting screw is fixedly connected to the elastic diaphragm, and the connecting plate is threadedly connected to the connecting screw. A nut is connected to the connecting screw. A groove is provided on the upper surface of the connecting plate, and the nut is arranged in the groove. By adjusting the installation position of the connecting plate on the connecting screw, the second spring can apply different pressures to the elastic diaphragm. Under a certain gas pressure or liquid pressure, the elastic diaphragm bends and deforms, so that the volume of the pressure chamber G1 and the pressure chamber G2 changes, thereby adjusting the gas and / or liquid pressure / fluid flow state at the nozzle cap injection outlet and / or the nozzle core injection outlet.

7. A spraying device for a gearbox manufacturing process according to claim 6, characterized in that: The nozzle cap includes a cap outlet hole (31) and a cap shoulder (32); a cap outlet hole is opened at the center of the bottom end of the nozzle cap, a cap shoulder is provided on the outer peripheral surface, and the cap shoulder is matched and connected with the lower end of the second shell; the nozzle core includes a central channel (41), a second through hole (42), a core outlet hole (43), and a core shoulder (44); a core outlet hole is opened at the center of the bottom end of the nozzle core, a core shoulder is provided on the outer peripheral surface, and the core shoulder is matched and connected with the lower end of the second shell; a plurality of second through holes distributed along the circumference are opened on the upper part of the nozzle core and are connected with the central channel.

8. The spraying device for gearbox manufacturing process according to claim 7, characterized in that: The second shell is also provided with a convex cylinder portion (24), which is located in the pressure chamber G2, and the upper part of the nozzle core is located in the convex cylinder portion. A first annular cavity (26) is formed between the outer peripheral surface of the upper part of the nozzle core and the convex cylinder portion. The outer peripheral wall of the convex cylinder portion is provided with a plurality of first through holes (25) distributed along the circumferential direction. The two ends of the first through hole are respectively connected to the pressure chamber G2 and the first annular cavity, and the two ends of the second through hole are respectively connected to the first annular cavity and the central channel. Liquid can enter the central channel through the first through hole, the first annular cavity, and the second through hole, and directly enter the central channel from the pressure chamber G2, so that the fluid flow state of the liquid entering the central channel can be adjusted.

9. The spraying device for a gearbox manufacturing process according to claim 8, characterized in that: The axis of the adjusting screw is arranged collinearly with the axis of the nozzle core, and the axis of the adjusting screw is arranged perpendicular to the axis of the air inlet; a second annular cavity (S1) is formed between the lower end of the second shell, the core shoulder, and the upper end of the nozzle cap, and an outer channel (S2) is formed between the outer peripheral surface of the lower end of the nozzle core and the inner peripheral surface of the lower end of the nozzle cap. The liquid flows through the third channel, the second annular cavity, and the outer channel in sequence to the injection outlet of the nozzle cap.

10. The spraying device for gearbox manufacturing process according to claim 9, characterized in that: The axis of the cap outlet hole is collinear with the axis of the core outlet hole, and the aperture of the cap outlet hole is 1.2-2.5 times the aperture of the core outlet hole, which can improve the spray uniformity and precision of the nozzle.

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