Tool for machining and hoisting spray needle and transition piece and method for machining spray needle

Abstract

The invention discloses a tool for spray needle machining and lifting and a transition piece and method for spray needle machining, and relates to the field of spray needle machining and assembling. A fitting table is arranged at the top of the alignment bed mould, a boss is arranged on the table surface of the fitting table, and a tool retracting space is formed in the outer side of the fitting table; the form and location tolerance of the table surface, the side surface and the boss of the fitting table is matched with the form and location tolerance of the outer circular surface, the large end surface and the seam allowance of the large-diameter section of the spray needle; a taper hole is formed in the fastening ring plate; and the fastening ring plate and the alignment bed mould are locked through a locking piece. A cylindrical table used for being clamped is arranged on the surface of the transition piece, the axis of the cylindrical table and the axis of the transition piece are collinear, the gravity center of the transition piece is located in the geometry of the clamping table, and the spray needle is formed by machining the transition piece in cooperation with the tool. According to the invention, the overflowing surface is not damaged, so that the molded line of the overflowing surface is closer to a theoretical molded line; and meanwhile, the machining precision of perpendicularity and coaxiality of the outer circular face and the large end face plane is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of spray needle processing and assembly, in particular to a tooling for spray needle processing and lifting, and a transition piece and method for spray needle processing. Background Art

[0002] The spray needle plays an important role in the impulse turbine, such as water guiding and load regulation. Due to the large size of the impulse turbine, the weight of its spray needle is as high as several hundred kilograms, and it has a conical shape, a large diameter section and a pointed end. Since the outer surface of the spray needle serves as the flow surface of the fluid, and the assembly requirements of the spray needle require that the flow surface be not damaged as much as possible during processing, and the flow surface line shape should be kept consistent as much as possible. On the other hand, the verticality between the large end face of the large diameter section and the outer circle of the large diameter section, as well as the coaxiality between the large end face of the large diameter section (the stop opened on the large end face of the large diameter section) and the outer circle of the large diameter section are required to be relatively high to meet the process and assembly requirements.

[0003] At present, the blank of the spray needle is processed from a cylindrical blank, and the shape is conical, the small end of which has a small cylindrical section with a small diameter, the large end has a large cylindrical section with a large diameter, and the large end is processed with a tapered hole coaxial with the tapered axis; the processing method of the spray needle is as follows: the first step is to perform rough processing on a lathe, that is, use a chuck to clamp the small end of the spray needle, and then use a plug to support the tapered hole at the large end of the spray needle, so that the plug cooperates with the chuck to support the spray needle to fix the spray needle; after the fixation is completed, the lathe is used to perform rough processing and semi-finishing processing on the flow surface and the large end. The processing of the large end includes The outer cylindrical surface and the large end surface are used as the alignment reference; the second step is to lift the rough-machined spray needle blank and clamp it on the boring machine. The clamping method is the same as that on the lathe. Then, the boring machine is used to fine-machine the large end plane and the stopper on the large end surface, as well as the installation screw holes on the large end surface, with the large end outer circle as the reference; the third step is to lift the workpiece processed in the second step and clamp it on the lathe, use the chuck to clamp the large end outer circle or the outer circle of the plug, and the small end is suspended. Then, the conical surface (flow surface) is processed, and the small cylindrical section at the small end is cut off. In the above processing steps, it can be known that the workpiece needs to be lifted and turned over. At the same time, it also needs to be lifted and turned over in actual assembly; and the surface of the spray needle after processing is high in precision and low in roughness. Direct lifting is easy to damage the precision and roughness of the spray needle surface; for this reason, the currently commonly used lifting and turning scheme is to process threaded holes on the outer cylindrical surface or the flow surface of the large diameter section, and install lifting rings on the threaded holes for lifting and turning over.

[0004] In practice, the above-mentioned prior art has the following problems: First, the threaded hole weakens the overall rigidity of the nozzle needle. In order to keep the profile of the flow surface consistent, it needs to be sealed with a screw plug. However, it is difficult to keep the profile of the flow surface consistent with the screw plug, which is more likely to cause cavitation damage and lead to water leakage. Second: During the processing, because of the only clamping method currently available, the outer cylindrical surface of the large diameter section, the large end face plane, and the stop are not processed on the same machine tool, so the verticality and coaxiality accuracy of the outer cylindrical surface and the large end face plane are not high.

[0005] Therefore, a new technical solution is needed for the processing, lifting and reverse installation of the spray needle. Summary of the invention

[0006] The purpose of the present invention is to provide a tooling and a transition piece and a method for processing and lifting a spray needle in order to solve the above-mentioned problems, so as not to damage the flow surface and make the profile of the flow surface closer to the theoretical profile; at the same time, effectively improve the processing accuracy of the verticality and coaxiality of the outer cylindrical surface and the large end surface.

[0007] The technical solution adopted by the present invention is as follows: a tooling for needle processing and lifting, the needle is in a conical structure after processing, and its two ends are respectively a tip and a large diameter section, the large diameter section has a large end face, and the large end face has a stop; it includes a aligning plate and a fastening ring plate; wherein: The top of the alignment plate is provided with a fitting platform that can fit with the large end surface, the table surface of the fitting platform is provided with a boss that is overfitted with the stopper, the outside of the fitting platform is a tool withdrawal space, and the diameter of the outer wall of the fitting platform is smaller than the outer diameter of the large diameter section; the form and position tolerances of the table surface, side surface and boss of the fitting platform match the form and position tolerances of the outer cylindrical surface, large end surface and stopper of the large diameter section of the spray needle; The fastening ring plate is provided with a tapered hole, the taper of the tapered hole matches the taper of the spray needle; The fastening ring plate and the tire alignment plate are locked by a locking piece.

[0008] Furthermore, a rubber pad is arranged in the tapered hole.

[0009] Furthermore, the locking member is a screw and a nut, one end of the screw is fixed on the tire alignment plate, a through hole for the screw to pass through is provided on the fastening ring plate, the other end of the screw passes through the through hole and is connected to the nut, and the size of the nut is larger than the aperture of the through hole.

[0010] Furthermore, a plurality of countersunk through holes are provided on the alignment plate, the axis of the countersunk through holes is parallel to the axis of the alignment plate, each countersunk through hole contains a connecting screw for threaded connection with the spray needle, and the distribution of the countersunk through holes is consistent with the distribution of the screw holes on the large end face; or / and a lifting hole is provided on the alignment plate, the axis of the lifting hole is parallel to the axis of the boss.

[0011] Furthermore, a plurality of countersunk through holes and / or raised holes are arranged in a circumferential array along the axis of the boss.

[0012] Furthermore, the side surfaces of the aligning plate and the fastening ring plate are both provided with lifting eye screw holes.

[0013] Furthermore, the aligning plate is provided with lifting screw holes.

[0014] A transition piece for needle processing, the transition piece has a conical structure, the front end of the transition piece has a small cylindrical section, the rear end of the transition piece is a large cylindrical end, the diameter of the small cylindrical section is smaller than the diameter of the large cylindrical section; a cylindrical table for clamping is arranged on the surface of the transition piece, the axis of the cylindrical table is colinear with the axis of the transition piece, and the center of gravity of the transition piece is located within the geometry of the clamping table.

[0015] Furthermore, a mounting hole is provided at the end surface of the large cylindrical section, and the axis of the mounting hole is colinear with the axis of the transition piece.

[0016] A method for processing a spray needle, using the tooling for processing and lifting the spray needle, and the transition piece for processing the spray needle; comprising the following steps: S1: Processing the blank into a transition piece; S2: Use a chuck to clamp the cylindrical table; S3: Use a lathe to perform rough machining, semi-finishing and finishing on the outer cylindrical surface, end surface and stopper of the large cylindrical end in sequence, and use the outer cylindrical surface as the alignment reference to make the shape and position tolerances of the outer cylindrical surface, end surface and stopper of the large cylindrical end meet the requirements, and complete the machining of the large diameter section; S4: using a tool to clamp the transition piece processed in step S3, lifting the processed transition piece to turn around, and using a chuck to clamp and align the tire plate, removing the remaining parts of the tool, and leaving the small cylindrical section of the processed transition piece suspended in the air; S41: In step S4, the geometric tolerances of the boss, the stop and the outer cylindrical surface are verified by measuring the distance between the side surface of the bonding platform and the outer cylindrical surface of the large diameter section; S5: Using a lathe, starting from the junction of the outer cylindrical surface and the end surface of the large cylindrical end, fine-machine the conical surface of the transition piece, and at the same time cut off the cylindrical table and the small cylindrical section to complete the processing of the flow surface.

[0017] S6: Remove the alignment plate, and based on the position of the connection screws, further drill and tap the screw holes on the end face of the large diameter section to complete the processing of the spray needle.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention is provided with a tooling, which can effectively assist the lifting and turning of the spray needle during the processing and assembly of the spray needle. There is no need to design screw holes and plugs on the flow surface, the structure is simpler, and the flow surface profile is closer to the theoretical profile; 2. The present invention provides a cylindrical table, and when processing the spray needle, there is no need to use a plug to cooperate with a chuck to tighten the spray needle for processing. Without the plug, the outer cylindrical surface, end surface and stopper of the large cylindrical section can be processed at one time, and there is no need to replace the clamping and processing equipment. The processed outer cylindrical surface, end surface and stopper have higher precision in shape and position tolerances and can better meet the design requirements; 3. The tooling disclosed in the present invention functions as a clamp during processing and as a hanger during assembly. It has a high degree of integration, a simple structure, and is easy to operate without damaging the surface of the spray needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the tooling disclosed in the present invention; Figure 2 It is a structural schematic diagram of the tire alignment plate disclosed in the present invention; Figure 3 It is a structural schematic diagram and a processing schematic diagram of the transition piece disclosed in the present invention; Markings in the figure: 1-transition piece; 11-cylindrical platform; 12-large cylindrical section; 121-screw hole; 122-mounting hole; 13-small cylindrical section; 2-spray needle; 21-flow surface; 22-large diameter section; 221-large end face; 222-stop; 223-screw hole; 3-alignment plate; 31-fitting platform; 32-boss; 33-retraction space; 34-lifting hole; 35-countersunk through hole; 36-connecting screw; 37-lifting screw hole; 4-fastening ring plate; 41-rubber pad; 5-screw; 51-nut; 6-lifting eye screw hole. DETAILED DESCRIPTION

[0020] In the description of this specification, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of this specification is usually placed when used. It is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this specification.

[0021] In addition, if the terms "horizontal" or "vertical" appear in the description of this specification, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this specification, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection between the internal parts of two elements.

[0023] Example 1 like Figure 1-Figure 2 As shown, a tool for needle processing and lifting, the tool can be used for positioning, aligning, lifting and turning the needle 2 during processing, and has the function of a processing fixture; it can also be used for lifting and turning the needle 2 when it is assembled on the turbine unit, and has the function of a lifting device; the needle 2 has a conical structure after processing, and its two ends are respectively a tip and a large diameter section 22, the large diameter section 22 has a large end face 221, and a stop 222 is provided at the large end face 221, the axis of the stop 222 is colinear with the axis of the large diameter section 22 and the needle 2, and the large end face 221 of the large diameter section 22 and the outer circle of the large diameter section 22 have shape and position tolerance requirements.

[0024] In this embodiment, the tooling includes a tire alignment plate 3 and a fastening ring plate 4; the details are as follows.

[0025] The top of the alignment tire plate 3 has a fitting platform 31 that can fit with the large end face 221, and the surface of the fitting platform 31 has a boss 32 that over-fits with the stop 222, and the thickness of the boss 32 is consistent with the depth of the stop 222 of the spray needle 2, so that the large end face 221 can fit with the surface of the fitting platform 31; the outer side of the fitting platform 31 is a tool withdrawal space 33, and the diameter of the outer side wall of the fitting platform 31 is smaller than the outer diameter of the large diameter section 22; the shape and position tolerances of the table surface, side surface and boss 32 of the fitting platform 31 match the shape and position tolerances of the outer cylindrical surface, large end face 221 and stop 222 of the large diameter section 22 of the spray needle 2.

[0026] The fastening ring plate 4 is provided with a tapered hole, the taper of which matches the taper of the spray needle 2 .

[0027] The fastening ring plate 4 and the aligning tire plate 3 are locked by a locking piece.

[0028] In this embodiment, through overfitting, the outer side surface of the boss 32 is tightly fitted with the inner wall of the stop 222, and the table surface of the fitting platform 31 is fitted with the large end surface 221, so as to position and constrain the spray needle 2, so that the spray needle 2 will not shake during subsequent processing, thereby ensuring the processing accuracy of the outer side surface (flow surface 21) of the spray needle 2, and the axis of the flow surface 21 can be on the same line with the axis of the boss 32 or the stop 222 to meet the shape and position requirements; the tool retraction space 33 is set, the main purpose of which is to prevent interference at the junction edge between the large end surface 221 and the outer cylindrical surface of the large diameter section 22, so that when processing the flow surface 21, the complete flow surface 21 can be processed at one time starting from the junction edge.

[0029] It should be noted that when installing the spray needle 2 on the tooling, whether it is when the spray needle 2 is being processed or when the spray needle 2 is assembled to the turbine unit, a dial indicator can be used to measure whether the dimensions between the outer cylindrical surface of the large diameter section 22 and the side surface of the bonding platform 31 meet the requirements to verify whether the spray needle 2 is correctly installed on the alignment plate 3. If the dimensions meet the requirements, it means that the spray needle 2 has been installed in place, and the subsequent processing of the flow surface 21 can meet the design shape and position tolerance requirements; otherwise, the spray needle 2 needs to be re-clamped.

[0030] In this embodiment, the fastening ring plate 4 is mainly used when lifting the spray needle 2. It fits over the conical surface of the spray needle 2 and cooperates with the alignment plate to achieve the clamping of the spray needle 2. When lifting, the lifting force can be applied to the fastening ring plate 4 and the alignment plate 3, and there is no need to process the lifting connection point on the spray needle 2. That is, this method does not need to design screw holes 223 and plugs on the flow surface 21, the structure is simpler, and the profile of the flow surface 21 is closer to the theoretical profile.

[0031] Example 2 Based on Example 1, a specific implementation method that can be implemented is further proposed.

[0032] In a feasible implementation manner, a rubber pad 41 is disposed in the tapered hole to prevent the inner wall of the tapered hole from damaging the tapered flow surface 21 and to play a protective role.

[0033] A feasible implementation method is that the locking parts are a screw 5 and a nut 51, one end of the screw 5 is fixed on the tire alignment plate 3, and a through hole for the screw 5 to pass through is provided on the fastening ring plate 4, and the other end of the screw 5 passes through the through hole to be connected with the nut 51, and the size of the nut 51 is larger than the aperture of the through hole. The fastening ring plate 4 and the tire alignment plate 3 are locked by the nut 51, and the mutual constraint between the fastening ring plate 4 and the spray needle 2 is cooperated to effectively realize the clamping of the spray needle 2.

[0034] A feasible implementation method is that a plurality of countersunk through holes 35 are opened on the alignment plate 3, and the axis of the countersunk through holes 35 is parallel to the axis of the alignment plate 3, and each countersunk through hole 35 contains a connecting screw 36 for threaded connection with the spray needle 2, and the distribution of the countersunk through holes 35 is consistent with the distribution of the screw holes 223 on the large end surface 221; specifically, when processing the large end surface 221, the screw hole 121 can be processed at the corresponding position on the spray needle 2, and the connecting screw 36 passes through the countersunk through hole 35 and is connected to the screw hole 121, so as to realize the circumferential constraint of the spray needle 2 and the connection between the spray needle 2 and the alignment plate 3, so as to ensure that when the flow surface 21 is subsequently processed, the circumferential position of the spray needle 2 is stable, and no relative rotation with the alignment plate 3 will occur under the action of the tool.

[0035] It should be noted that the size of the screw hole 121 needs to be smaller than the screw hole 223 on the large end face 221, and the position should be consistent with the screw hole 223; when subsequently processing the screw hole 223 on the large end face 221, further processing can be performed directly on the screw hole 121 without adding new processing position points to the end face of the large end face 221.

[0036] A feasible implementation method is to set a lifting hole 34 on the alignment tire plate 3, and the axis of the lifting hole 34 is parallel to the axis of the boss 32, so as to facilitate the subsequent removal of the spray needle 2. The spray needle 2 can be removed by pushing the spray needle 2 through the lifting hole 34 with a tool.

[0037] Furthermore, a plurality of countersunk through holes 35 and / or jacking holes 34 are arranged in a circumferential array along the axis of the boss 32 so that the force distribution is uniform.

[0038] A feasible implementation method is that the sides of the alignment tire plate 3 and the fastening ring plate 4 are provided with lifting screw holes 6. By installing lifting rings in the lifting screw holes 6, the tooling installed with the spray needle 2 can be lifted to achieve the lifting and flipping of the spray needle 2.

[0039] In a feasible implementation manner, a lifting screw hole 37 is provided on the aligning plate 3 , and a lifting tool is connected to the lifting screw hole 37 to lift the aligning plate 3 .

[0040] Example 3 like Figure 3 As shown, a transition piece for needle processing, the transition piece 1 is of a conical structure, and its size is close to the design size of the needle 2, reducing the subsequent processing amount; the front end of the transition piece 1 has a small cylindrical section 13, and the rear end of the transition piece 1 is a large cylindrical end, and the diameter of the small cylindrical section 13 is smaller than the diameter of the large diameter section 22; a cylindrical table 11 for clamping is provided on the surface of the transition piece 1, and the axis of the cylindrical table 11 is colinear with the axis of the transition piece 1, and the center of gravity of the transition piece 1 is located within the geometry of the clamping table, and it can be determined that the cylindrical table 11 is arranged between the large cylindrical section 12 and the small cylindrical section 13.

[0041] In this embodiment, when processing the large cylindrical section 12 to form the large diameter section 22, since the clamping position is on the cylindrical table 11, there is no structure or part at the large cylindrical section 12, and no position interference will be caused to the comprehensive and all-round processing of the large cylindrical section 12, that is, the processing of the outer cylindrical surface, end surface and stop 222 of the large cylindrical section 12 can be completed at one time, thereby forming the large diameter end of the spray needle 2; there is no need to replace the processing equipment and the clamping station during processing, so that the shape and position tolerance of the processed large diameter section 22 can be closer to or even meet the design requirements.

[0042] In this embodiment, a cylindrical table 11 is provided, and the center of gravity of the transition piece 1 is required to be within the cylindrical table 11, in order to stably clamp the transition piece 1; if a chuck is used to clamp the cylindrical table 11, the center of gravity of the transition piece 1 is within the chuck, so the transition piece 1 can be stably clamped; of course, in practice, if the cylindrical table 11 cannot surround the center of gravity, the center of gravity may not be within the cylindrical table 11, but it needs to be as close to the cylindrical table 11 as possible.

[0043] In a feasible implementation manner, a mounting hole 122 is opened at the end face of the large cylindrical section 12 , and the axis of the mounting hole 122 is colinear with the axis of the transition piece 1 . The mounting hole 122 is used to facilitate the subsequent processing of the stop 222 and adjust the center of gravity position of the transition piece 1 .

[0044] In a feasible implementation manner, the end surface of the large cylindrical section 12 is provided with the screw hole 121 mentioned above.

[0045] Example 4 like Figure 3 As shown, a method for processing a needle sprayer is provided, using the tooling for processing and lifting the needle sprayer as described in any one of the embodiments 1-2, and the transition piece for processing the needle sprayer as described in embodiment 3; comprising the following steps: S1: Processing the blank into a transition piece 1; S2: using a chuck to clamp the cylindrical table 11; S3: Rough machining, semi-finishing machining and finishing machining are performed on the outer cylindrical surface, end surface and stopper 222 of the large cylindrical end in sequence by using a lathe, and the outer cylindrical surface is used as an alignment reference so that the shape and position tolerances of the outer cylindrical surface, end surface and stopper 222 of the large cylindrical end meet the requirements, and the machining of the large diameter section 22 is completed; S4: using a tool to clamp the transition piece 1 processed in step S3, lifting the processed transition piece 1 to turn around, and using a chuck to clamp and align the tire plate 3, removing the remaining parts of the tool, and the small cylindrical section 13 of the processed transition piece 1 is suspended in the air; S41: In step S4, the concentricity of the boss 32, the stop 222, and the outer cylindrical surface is verified by measuring the distance between the side surface of the bonding platform 31 and the outer cylindrical surface of the large diameter section 22; S5: Using a lathe, starting from the junction between the outer cylindrical surface and the end surface of the large cylindrical end, the conical surface of the transition piece 1 is finely machined, and the cylindrical platform 11 and the small cylindrical section 13 are cut off at the same time to complete the machining of the flow surface 21.

[0046] S6: Remove the alignment tire plate 3, and based on the position connected with the connecting screw 36, further drill and tap the screw hole 223 on the end surface of the large diameter section 22 to complete the processing of the injection needle 2.

[0047] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A tool for processing and lifting a spray needle, wherein the spray needle (2) has a conical structure after processing, and its two ends are respectively a tip and a large diameter section (22), the large diameter section (22) has a large end surface (221), and the large end surface (221) has a stopper (222); the characteristics are: It comprises a tire alignment plate (3) and a fastening ring plate (4); wherein: The top of the alignment plate (3) has a bonding platform (31) that can be bonded with the large end surface (221), the surface of the bonding platform (31) has a boss (32) that is overfitted with the stop (222), the outside of the bonding platform (31) is a tool retraction space (33), and the diameter of the outer wall of the bonding platform (31) is smaller than the outer diameter of the large diameter section (22); the shape and position tolerances of the surface, side surface and boss (32) of the bonding platform (31) match the shape and position tolerances of the outer cylindrical surface, large end surface (221) and stop (222) of the large diameter section (22) of the spray needle (2); The fastening ring plate (4) has a tapered hole, the taper of the tapered hole matches the taper of the spray needle (2); The fastening ring plate (4) and the tire alignment plate (3) are locked via a locking piece.

2. The tooling according to claim 1, characterized in that: A rubber pad (41) is arranged in the tapered hole.

3. The tooling according to claim 1, characterized in that: The locking member comprises a screw rod (5) and a nut (51); one end of the screw rod (5) is fixed to the aligning plate (3); a through hole for the screw rod (5) to pass through is provided on the fastening ring plate (4); the other end of the screw rod (5) passes through the through hole and is connected to the nut (51); the size of the nut (51) is larger than the aperture of the through hole.

4. The tooling according to claim 1, characterized in that: The alignment plate (3) is provided with a plurality of countersunk through holes (35), the axes of the countersunk through holes (35) are parallel to the axes of the alignment plate (3), each countersunk through hole (35) contains a connecting screw (36) for threaded connection with the spray needle (2), and the distribution of the countersunk through holes (35) is consistent with the distribution of the screw holes (223) on the large end surface (221); or / and a lifting hole (34) is provided on the alignment plate (3), the axes of the lifting hole (34) are parallel to the axes of the boss (32).

5. The tooling according to claim 4, characterized in that: A plurality of countersunk through holes (35) and / or jacking holes (34) are arranged in a circumferential array along the axis of the boss (32).

6. The tooling according to claim 1, characterized in that: The side surfaces of the aligning plate (3) and the fastening ring plate (4) are both provided with lifting eye screw holes (6).

7. The tooling according to claim 1, characterized in that: The aligning plate (3) is provided with a lifting screw hole (37).

8. A transition piece processed by a needle spray, characterized in that: The transition piece (1) has a conical structure, the front end of the transition piece (1) has a small cylindrical section, the rear end of the transition piece (1) is a large cylindrical end, the diameter of the small cylindrical section is smaller than the diameter of the large cylindrical section (12); a cylindrical platform (11) for being clamped is provided on the surface of the transition piece (1), the axis of the cylindrical platform (11) is colinear with the axis of the transition piece (1), and the center of gravity of the transition piece (1) is located within the geometry of the clamping platform.

9. The transition piece according to claim 8, characterized in that: A mounting hole (122) is provided at the end surface of the large cylindrical section (12), and the axis of the mounting hole (122) is colinear with the axis of the transition piece (1).

10. A method for needle processing, characterized in that: Using the tooling for needle processing and lifting according to any one of claims 1 to 7, and the transition piece for needle processing according to any one of claims 8 to 9; comprising the following steps: S1: Processing the blank into a transition piece (1); S2: using a chuck to clamp the cylindrical table (11); S3: using a lathe to sequentially perform rough machining, semi-finishing machining and finishing machining on the outer cylindrical surface, end surface and stopper (222) of the large cylindrical end, and using the outer cylindrical surface as an alignment reference, so that the shape and position tolerances of the outer cylindrical surface, end surface and stopper (222) of the large cylindrical end meet the requirements, and the machining of the large diameter section (22) is completed; S4: using a tool to clamp the transition piece (1) processed in step S3, lifting the processed transition piece (1) to turn around, and using a chuck to clamp and align the tire plate (3), removing the remaining parts of the tool, and leaving the small cylindrical section of the processed transition piece (1) suspended in the air; S41: In step S4, the geometric tolerances of the boss (32), the stop (222), and the outer cylindrical surface are verified by measuring the distance between the side surface of the bonding platform (31) and the outer cylindrical surface of the large diameter section (22); S5: Using a lathe, starting from the junction between the outer cylindrical surface and the end surface of the large cylindrical end, the conical surface of the transition piece (1) is finely machined, and the cylindrical platform (11) and the small cylindrical section are removed at the same time, thereby completing the machining of the flow surface (21); S6: Remove the alignment plate (3), and based on the position connected with the connecting screw (36), further drill and tap the screw hole (223) on the end surface of the large diameter section (22), and complete the processing of the spray needle (2).

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