Numerical control turbine boring machine and method

Abstract

The application relates to a numerical control gear boring machine of a steam turbine, which comprises a cylindrical main shaft, an active box seat axially sleeved at one end of the main shaft, a driven box seat axially sleeved at the other end of the main shaft, the active box seat being used for driving the main shaft to rotate around a central axis, support mechanisms being respectively radially symmetrically arranged on the active box seat and the driven box seat, a rotary slide axially sleeved on the main shaft and synchronously rotating with the main shaft, the rotary slide being located between the active box seat and the driven box seat, a cutter being radially arranged on the rotary slide, the rotary slide being used for driving the cutter to move along the main shaft in the axial and radial directions, the rotary slide being used for feeding the cutter, and the steam turbine blade tooth tip is bored under the full solid cylinder state.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine maintenance equipment, and in particular relates to a steam turbine numerical control gear boring machine and method. Background Art

[0002] Steam turbines are rotating equipment powered by steam. They have dynamic seals, which require steam baffles to prevent steam leakage. The gap between these baffles is crucial for steam turbines. Generally, the clearance tolerance is 0.15mm. Excessive gaps can reduce unit efficiency, while too small a gap can cause friction in the dynamic seals, compromising safe turbine operation. The turbine rotor is the rotating component, supported by grounded bearings at both ends and isolated from the stationary cylinder. The turbine cylinder, the stationary component, consists of a multi-layered structure consisting of upper and lower halves. Inside, stationary components such as the baffle sleeve and vane retainer rings are installed. Due to deformation of these components during high-temperature operation, the seal area undergoes elliptical deformation from the half-cylinder to the full-cylinder. This elliptical deformation can also cause deviation between the center of the half-cylinder and the full-cylinder.

[0003] During current maintenance, due to the limited internal space of a fully-filled turbine, baffle tip diameter machining is performed only with the turbine halfway through the cylinder. However, with the cylinder fully filled, the center of the stationary components shifts, causing the baffle tips to become misaligned with the rotor and exhibiting roundness deviations. Consequently, a tool capable of boring baffle tips with the cylinder fully filled is urgently needed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a CNC boring machine and method for a steam turbine gear. The specific technical solutions are as follows:

[0005] The present invention provides a CNC boring machine for a steam turbine, comprising a main shaft of a cylindrical structure, wherein an active housing seat is axially sleeved on one end of the main shaft, and a driven housing seat is axially sleeved on the other end thereof, the active housing seat being used to drive the main shaft to rotate around its central axis; support mechanisms are radially symmetrically arranged on the active housing seat and the driven housing seat respectively; a rotating slide is axially sleeved on the main shaft and rotates synchronously with the main shaft, and the rotating slide is located between the active housing seat and the driven housing seat; a tool is radially arranged on the rotating slide, and the rotating slide is used to drive the tool to move along the main shaft in both axial and radial directions; a conductive slip ring is axially arranged on the end face of the main shaft facing the active housing seat, the outer end of the conductive slip ring is connected to a CNC system via an electric wire, and the inner end thereof is electrically connected to the rotating slide via a drag chain assembly arranged in the main shaft.

[0006] As a preferred technical scheme of the present application, the driving box seat comprises a first supporting ring axially sleeved on the end of the main shaft, the first supporting ring is rotationally connected with the main shaft through the first bearings symmetrically arranged on the end face of the first supporting ring, the middle part of the first supporting ring is axially provided with a ring gear not in contact with the inner wall thereof, and the ring gear is axially fixedly connected with the end of the main shaft, and the ring gear is circumferentially rotated by the first driving mechanism arranged on the top of the first supporting ring.

[0007] The driven box seat comprises a second supporting ring axially sleeved on the end of the main shaft, and the second supporting ring is rotationally connected with the main shaft through the second bearings symmetrically arranged on the end face of the second supporting ring.

[0008] As a preferred technical scheme of the present application, the first driving mechanism comprises a first servo motor transversely arranged, a first speed reducer axially connected with the power output end of the first servo motor, a first gear axially connected with the power output end of the first speed reducer, the first gear being meshingly connected with the ring gear, a first housing matched with the first gear being sleeved on the outside of the first gear, the bottom surface of the first housing being fixedly communicated and docked with the top surface of the first supporting ring, and the first speed reducer being axially fixedly connected with the end face of the first housing.

[0009] As a preferred technical scheme of the present application, the supporting mechanism comprises a supporting leg plate radially perpendicularly connected with the first supporting ring or the second supporting ring, an up-down adjusting screw vertically screwed on the bottom surface of the outer end of the supporting leg plate, a limiting groove penetratingly arranged on the supporting leg plate along the long direction thereof, and a left-right adjusting screw arranged in the limiting groove.

[0010] As a preferred technical scheme of the present application, the rotary slide comprises a third supporting ring axially sleeved on the main shaft, a Z-direction feeding mechanism arranged on the third supporting ring for driving the third supporting ring to axially move along the main shaft, and an X-direction feeding mechanism arranged on the third supporting ring and radially opposite to the Z-direction feeding mechanism, the X-direction feeding mechanism being used for driving the tool to radially move along the main shaft.

[0011] As a preferred technical scheme of the present application, the Z-direction feeding mechanism comprises a walking gear rotatably connected with the third supporting ring, the walking gear being meshingly connected with a first gear rack axially arranged on the outer wall of the main shaft, and the length of the first gear rack being the same as the length of the main shaft; the walking gear is circumferentially rotated by the second driving mechanism arranged on the third supporting ring.

[0012] The second driving mechanism includes a second servo motor, the power output end of the second servo motor is axially connected to a second reducer, the second reducer is tangentially fixedly connected to the outer wall of the third support ring, the power output end of the second reducer is axially connected to a second gear, and the second gear is meshed with the traveling gear.

[0013] As a preferred technical solution of the present invention, the X-direction feeding mechanism includes a slide plate that is slidably connected to a slide rail corresponding to one side of the outer wall of the third support ring, and the tool is installed on one end of the slide plate through a tool rod axially connected to it. The bottom surface of the slide plate is provided with a second rack along its long side direction, and the second rack is transmission-connected to a transmission assembly arranged at one end of the bottom surface of the slide rail, and the transmission assembly is driven by a third drive mechanism arranged on one side thereof to rotate circumferentially.

[0014] As a preferred technical solution of the present invention, the transmission assembly includes a second housing, the second housing is arranged at the end of the bottom surface of the slide rail facing the tool side, the inner wall of the second housing is vertically provided with a transmission shaft, one end of the transmission shaft is rotatably connected to a third bearing correspondingly embedded in the inner wall of the second housing, and the other end is connected to the third driving mechanism; an anti-backlash gear is axially sleeved on the transmission shaft, and the anti-backlash gear is meshed with the second rack;

[0015] The third driving mechanism includes a third servo motor, the power output end of the third servo motor is axially connected to a third reducer, the power output end of the third reducer is axially connected to a steering gear, and the power output end of the steering gear is axially connected to the transmission shaft; the third servo motor faces away from the tool.

[0016] As a preferred technical solution of the present invention, the conductive slip ring includes a dynamic ring axially fixedly connected to the end face of the corresponding main shaft, the outer end of the dynamic ring is axially rotatably sleeved with a static ring, and the static ring is electrically connected to the CNC system via a first lead wire;

[0017] The drag chain assembly includes an electrical drag chain axially arranged in the main shaft, one end of the electrical drag chain is connected to the dynamic ring of the conductive slip ring, and the other end is connected to a ring cable; a straight groove is axially penetrated through the outer wall of the main shaft, and the ends of the straight groove are respectively connected to torsion rollers through pin shafts, and the two torsion rollers are sleeved with the ring cables, and the ring cables do not contact the inner wall of the third support ring; the ring cable is electrically connected to the Z-direction feed mechanism and the X-direction feed mechanism of the rotating slide through a second lead wire.

[0018] The present invention also provides a method for a steam turbine numerically controlled boring machine, which is used to bore the tips of the baffle teeth in the steam turbine cylinder in a fully solid cylinder state, and comprises the following steps:

[0019] Step S1: When the turbine cylinder is in a half-cylinder state, the CNC gear boring machine is hoisted in, and the support mechanisms at both ends are adjusted to support the corresponding turbine bearing box;

[0020] Step S2, aligning the CNC boring machine according to the dimple values ​​at both ends of the part to be processed of the steam turbine;

[0021] Step S3: Install the tool and set the tool tip rotation diameter through the rotating slide;

[0022] Step S4: sequentially install the upper half cylinders of the steam turbine so that they are in a fully filled cylinder state;

[0023] Step S5: The tool is driven by the active housing and the rotary slide to bore the tooth tips of the steam baffles in sequence.

[0024] The beneficial effects of the present invention are:

[0025] The present invention comprises a rotary unit composed of a main shaft, an active housing seat and a driven housing seat. The rotation center of the rotary unit coincides with the axis of the turbine rotor. A rotary slide is provided on the main shaft. The rotary slide is used to drive the tool to move along the main shaft in both axial and radial directions to realize the feeding of the tool, thereby boring the tooth tip of the steam baffle in a fully solid cylinder state. The rotary slide is electrically connected to the external CNC system through the drag chain assembly and the conductive slip ring in the main shaft, which does not affect the rotation and displacement of the rotary slide on the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shows a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 Shows a structural cross-sectional view of the active housing seat in the present invention;

[0028] Figure 3 Shows a schematic diagram of the three-dimensional structure of the active housing seat in the present invention;

[0029] Figure 4 The figure shows the front view of the structure of the rotary slide and the tool assembly in the present invention;

[0030] Figure 5 A schematic diagram of the three-dimensional structure of the rotary slide in the present invention is shown;

[0031] Figure 6 A partial structural cross-sectional view of the rotary slide in the present invention is shown (I);

[0032] Figure 7 A partial structural cross-sectional view of the rotary slide in the present invention is shown (II);

[0033] Figure 8A structural cross-sectional view of the main shaft in the present invention is shown.

[0034] As shown in the figure: 1. Main shaft; 11. First rack; 12. Straight groove; 2. Active housing seat; 21. First support ring; 22. First bearing; 23. Ring gear; 24. First driving mechanism; 241. First servo motor; 242. First reducer; 243. First gear; 244. First housing; 3. Driven housing seat; 31. Second support ring; 32. Second bearing; 4. Support mechanism; 41. Support leg plate; 42. Up and down adjustment screw; 43. Left and right adjustment screw; 431. Limiting groove; 5. Rotating slide; 51. Third support ring; 511. Slide rail; 52. Z-direction feed mechanism; 521. Travel gear; 522. Second driving mechanism; 5221. Second Servo motor; 5222, second reducer; 5223, second gear; 53, X-axis feed mechanism; 531, slide plate; 5311, second rack; 532, transmission assembly; 5321, second housing; 5322, transmission shaft; 5323, third bearing; 5324, anti-backlash gear; 533, third drive mechanism; 5331, third servo motor; 5332, third reducer; 5333, steering gear; 6, tool; 61, tool rod; 7, conductive slip ring; 71, dynamic ring; 72, static ring; 721, first lead wire; 8, CNC system; 9, drag chain assembly; 91, electrical drag chain; 92, ring cable; 921, second lead wire; 93, torque roller. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Example 1

[0037] To solve the technical problems in the background technology, a steam turbine CNC boring machine and method are provided as follows:

[0038] Combine Figure 1 and 8As shown, a CNC boring machine for a steam turbine comprises a main shaft 1 of a cylindrical structure, an active housing seat 2 being axially sleeved on one end of the main shaft 1, and a driven housing seat 3 being axially sleeved on the other end thereof, the active housing seat 2 being used to drive the main shaft 1 to rotate around its central axis; support mechanisms 4 are radially symmetrically arranged on the active housing seat 2 and the driven housing seat 3 respectively; a rotating slide 5 which rotates synchronously with the main shaft 1 is axially sleeved on the main shaft 1, and the rotating slide 5 is located between the active housing seat 2 and the driven housing seat 3; a tool 6 is radially arranged on the rotating slide 5, and the rotating slide 5 is used to drive the tool 6 to move along the main shaft 1 in both axial and radial directions; a conductive slip ring 7 is axially arranged on the end face of the main shaft 1 facing the active housing seat 2, the outer end of the conductive slip ring 7 is connected to a CNC system 8 through an electric wire, and the inner end thereof is electrically connected to the rotating slide 5 through a drag chain assembly 9 arranged in the main shaft 1.

[0039] By adopting the above technical solution, the CNC boring machine is composed of a rotary unit consisting of a main shaft 1, an active housing seat 2, and a driven housing seat 3. The rotation center of the rotary unit coincides with the axis of the turbine rotor. A rotating slide 5 is provided on the main shaft 1. The rotating slide 5 is used to drive the tool 6 to move along the main shaft 1 in both axial and radial directions to realize the feeding of the tool 6, thereby boring the tooth tip of the steam baffle in a fully solid cylinder state; wherein, the rotating slide 5 is electrically connected to the external CNC system 8 through the drag chain assembly 9 and the conductive slip ring 7 in the main shaft 1, which does not affect the rotation and displacement of the rotating slide 5 on the main shaft 1; the CNC system 8 is a 3-axis bus closed-loop CNC, which can bore ellipses and polygons.

[0040] Example 2

[0041] like Figure 2 and 3 As shown, based on the above embodiment, this embodiment further provides the following content:

[0042] In this embodiment, the active housing seat 2 includes a first support ring 21 axially sleeved on the end portion corresponding to the main shaft 1. The first support ring 21 is rotatably connected to the main shaft 1 via a first bearing 22 symmetrically arranged on its end surface. A ring gear 23 is axially arranged in the middle portion of the first support ring 21 so as not to contact the inner wall thereof. The ring gear 23 is axially fixedly connected to the end portion corresponding to the main shaft 1. The ring gear 23 is driven to rotate circumferentially by a first driving mechanism 24 arranged on the top of the first support ring 21.

[0043] The driven housing seat 3 includes a second support ring 31 axially sleeved on the end portion corresponding to the main shaft 1 . The second support ring 31 is rotatably connected to the main shaft 1 via a second bearing 32 symmetrically arranged on its end surface.

[0044] By adopting the above technical solution, the main shaft 1 rotates circumferentially in the first support ring 21 and the second support ring 31 through the first bearing 22 and the second bearing 32. The first support ring 21 and the second support ring 31 are connected to the main shaft 1 in a detachable manner so that the two can slide axially on the main shaft 1, thereby facilitating adjustment of the distance between the two.

[0045] like Figure 2 and 3 As shown, the first driving mechanism 24 includes a first servo motor 241 arranged horizontally, and the power output end of the first servo motor 241 is axially connected to the first reducer 242, and the power output end of the first reducer 242 is axially connected to the first gear 243, and the first gear 243 is meshed with the annular gear 23. The outside of the first gear 243 is provided with a first shell 244 adapted thereto, and the bottom surface of the first shell 244 is fixedly connected and docked with the top surface of the first support ring 21, and the first reducer 242 is axially fixedly connected to the end face corresponding to the first shell 244.

[0046] By adopting the above technical solution, the first servo motor 241 drives the first reducer 242 to rotate, the first reducer 242 drives the first gear 243 to rotate, the first gear 243 drives the annular gear 23 to rotate, and the annular gear 23 drives the main shaft 1 to rotate around the first bearing 22 and the second bearing 32, thereby realizing the rotation function of the rotating slide 5.

[0047] like Figure 1 As shown, the support mechanism 4 includes a leg plate 41 radially and perpendicularly connected to the first support ring 21 or the second support ring 31, and the bottom surface of the outer end of the leg plate 41 is vertically screwed with upper and lower adjustment screws 42. A limiting groove 431 is provided on the leg plate 41 along its long side direction, and left and right adjustment screws 43 are arranged in the limiting groove 431.

[0048] By adopting the above technical solution, the position of the main shaft 1 is adjusted by the up and down adjusting screws 42 and the left and right adjusting screws 43, so that the main shaft 1 coincides with the axis of the turbine rotor; wherein, the up and down adjusting screws 42 can realize the up and down adjustment function by rotating upward or downward; the left and right adjusting screws 43 can realize the left and right adjustment function by moving horizontally along the limit groove 431.

[0049] Example 3

[0050] like Figure 4 As shown, based on the above embodiment, this embodiment further provides the following content:

[0051] In the embodiment, the rotating slide 5 comprises a third supporting ring 51 axially sleeved on the main shaft 1, the third supporting ring 51 is provided with a Z-direction feeding mechanism 52 for driving the third supporting ring 51 to move axially along the main shaft 1, the third supporting ring 51 is further provided with an X-direction feeding mechanism 53, and the X-direction feeding mechanism 53 is arranged in a radial direction opposite to the Z-direction feeding mechanism 52, and the X-direction feeding mechanism 53 is used for driving the cutter 6 to move radially along the main shaft 1.

[0052] By adopting the above technical scheme, the third supporting ring 51 in the rotating slide 5 can rotate circumferentially along with the main shaft 1, so as to drive the cutter 6 to move circumferentially during boring; the Z-direction feeding mechanism 52 can drive the third supporting ring 51 to move axially along the main shaft 1, so as to displace and bore the plurality of steam blade tooth tips in the steam turbine cylinder; the X-direction feeding mechanism 53 can drive the cutter 6 on the third supporting ring 51 to move radially along the main shaft 1, so as to reasonably displace the steam blade tooth tips according to the radial depth; in this way, the rotating slide 5 can continuously complete the boring of the diameters of the steam blade tooth tips in the full solid cylinder state.

[0053] As shown in Figure 5 and 6 , the Z-direction feeding mechanism 52 comprises a walking gear 521 rotatably connected to the third supporting ring 51, the walking gear 521 is in meshing connection with a first rack 11 axially arranged on the outer wall of the main shaft 1, and the length of the first rack 11 is the same as the length of the main shaft 1; the walking gear 521 is driven to rotate circumferentially by a second driving mechanism 522 arranged on the third supporting ring 51.

[0054] The second driving mechanism 522 comprises a second servo motor 5221, the power output end of the second servo motor 5221 is axially connected with a second speed reducer 5222, the second speed reducer 5222 is tangentially fixedly connected with the outer wall of the third supporting ring 51, the power output end of the second speed reducer 5222 is axially connected with a second gear 5223, and the second gear 5223 is in meshing connection with the walking gear 521.

[0055] By adopting the above technical scheme, the second servo motor 5221 drives the second speed reducer 5222 to rotate, the second speed reducer 5222 drives the second gear 5223 to rotate, and the second gear 5223 drives the walking gear 521 to move axially along the first rack 11 on the main shaft 1, so as to realize the function of the Z-direction feeding mechanism 52 driving the cutter 6 to move axially.

[0056] As shown in Figure 5 and 6As shown, the X-direction feeding mechanism 53 includes a slide 531 that is slidably connected to a slide rail 511 corresponding to one side of the outer wall of the third support ring 51, and the tool 6 is installed on one end of the slide 531 through a tool rod 61 axially docked with it. The bottom surface of the slide 531 is provided with a second rack 5311 along its long side direction, and the second rack 5311 is transmission-connected to a transmission assembly 532 arranged at one end of the bottom surface of the slide rail 511. The transmission assembly 532 is driven by a third driving mechanism 533 arranged on one side thereof to rotate circumferentially.

[0057] By adopting the above technical solution, the third drive mechanism 533 drives the transmission assembly 532 to operate, and the transmission assembly 532 drives the slide 531 to move along the slide rail 511 via the second rack 5311, thereby realizing the function of the X-direction feed mechanism 53 to drive the radial feed of the tool 6. The tool rod 61 and the slide 531, as well as the tool rod 61 and the tool 6, can be connected by bolts to facilitate subsequent disassembly and replacement.

[0058] like Figure 6 and 7 As shown, the transmission assembly 532 includes a second housing 5321, which is arranged at the end of the bottom surface of the slide rail 511 facing the tool 6. A transmission shaft 5322 is vertically provided on the inner wall of the second housing 5321. One end of the transmission shaft 5322 is rotatably connected to a third bearing 5323 correspondingly embedded in the inner wall of the second housing 5321, and the other end is connected to the third driving mechanism 533; an anti-backlash gear 5324 is axially sleeved on the transmission shaft 5322, and the anti-backlash gear 5324 is meshed with the second rack 5311;

[0059] The third driving mechanism 533 includes a third servo motor 5331, the power output end of the third servo motor 5331 is axially connected to the third reducer 5332, the power output end of the third reducer 5332 is axially connected to the steering gear 5333, and the power output end of the steering gear 5333 is axially connected to the transmission shaft 5322; the third servo motor 5331 is directed toward the side away from the tool 6.

[0060] By adopting the above technical solution, the third servo motor 5331 drives the third reducer 5332 to rotate, which in turn drives the steering gear 5333 to rotate. The steering gear 5333 can perform a 90-degree turn, thereby driving the transmission shaft 5322 to rotate. The transmission shaft 5322 cooperates with the third bearing 5323 to drive the anti-backlash gear 5324 to rotate. The anti-backlash gear 5324 then synchronously drives the slide 531 along the slide rail 511 via the second rack 5311. The use of the steering gear 5333 for steering allows the third servo motor 5331 to be spatially parallel to the second servo motor 5221, facilitating balanced displacement and rotation of the entire rotating slide 5 within the turbine cylinder.

[0061] Example 4

[0062] like Figure 1 and 8 As shown, based on the above embodiment, this embodiment further provides the following content:

[0063] In this embodiment, the conductive slip ring 7 includes a dynamic ring 71 axially fixedly connected to the end face of the corresponding spindle 1, and the outer end of the dynamic ring 71 is axially rotatably sleeved with a static ring 72, and the static ring 72 is electrically connected to the CNC system 8 via a first lead wire 721;

[0064] The drag chain assembly 9 includes an electrical drag chain 91 axially arranged in the main shaft 1, one end of the electrical drag chain 91 is connected to the dynamic ring 71 of the conductive slip ring 7, and the other end is connected to a ring cable 92; a straight groove 12 is axially penetrated through the outer wall of the main shaft 1, and the ends of the straight groove 12 are respectively connected to the torsion rollers 93 through the pin shaft, and the two torsion rollers 93 are sleeved with the ring cables 92, and the ring cables 92 do not contact the inner wall of the third support ring 51; the ring cable 92 is electrically connected to the Z-direction feed mechanism 52 and the X-direction feed mechanism 53 of the rotating slide 5 through the second lead-out line 921.

[0065] By adopting the above technical solution, the conductive slip ring 7 uses a dynamic ring 71 and a static ring 72 to perform electrical connection of the rotating part; the electrical drag chain 91 in the built-in drag chain assembly 9 pulls the ring cable 92 to rotate along the torsion roller 93 as the rotating slide 5 moves axially. When the rotating slide 5 is reset, the torsion roller 93 drives the ring cable 92 to rotate and reset, thereby not affecting the power supply and data transmission of the rotating slide 5 during the boring process.

[0066] In accordance with the above-mentioned embodiments 1 to 4, a method for boring a steam turbine gear using a numerically controlled boring machine is adopted. The method is used to bore the tips of the baffle teeth in the steam turbine cylinder under a fully solid cylinder state, and the method comprises the following steps:

[0067] Step S1, in the half-cylinder state of the steam turbine cylinder, hoist the numerical control gear hobbing machine, and adjust the support mechanism 4 at both ends to support the corresponding bearing box of the steam turbine;

[0068] Step S2, according to the dimple value of the both ends of the steam turbine to be processed, align the numerical control gear hobbing machine;

[0069] Step S3, install the cutter 6, and set the cutter tip rotation diameter through the rotating slide 5;

[0070] Step S4, install the upper half-cylinder of the steam turbine cylinder in sequence, so that it is in the full-cylinder state;

[0071] Step S5, through the driving of the main box seat 2 and the rotating slide 5, the cutter 6 bores the steam turbine blade tip in sequence.

[0072] By adopting the above technical scheme, the numerical control gear hobbing machine is erected on the cylinder of the steam turbine, and the support mechanism is supported on the appropriate position (such as the shaft seal sleeve or the balance ring sleeve) of the bearing box, taking the dimple center value in the full-cylinder state as the reference; when installing the upper half-cylinder, the bolt is fastened according to the full-cylinder standard, so as to ensure that there is no gap in the joint surface and the bolt has sufficient tightness; after the boring is completed, the upper half-cylinder of the steam turbine is removed in sequence, and then the numerical control gear hobbing machine is hoisted out; by adopting the numerical control technology and the servo feeding mechanism, a wireless camera can also be added, without the need for personnel to enter the cylinder of the steam turbine, so as to observe the processing condition and real-time feeding; the servo feeding mechanism is closed-loop controlled, without the need for repeated size measurement; the precision of the method for boring the steam turbine blade tip can reach within 0.1 mm; the amount of debris bored by the numerical control gear hobbing machine is small, and the single-side discharge is within 1 mm, without worrying about the influence of the debris on the boring.

[0073] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A steam turbine CNC boring machine, characterized in that: The invention comprises a main shaft (1) of cylindrical structure, wherein one end of the main shaft (1) is axially sleeved with an active housing seat (2), and the other end thereof is axially sleeved with a driven housing seat (3), wherein the active housing seat (2) is used to drive the main shaft (1) to rotate around its central axis; the active housing seat (2) and the driven housing seat (3) are respectively provided with support mechanisms (4) in radial symmetry; the main shaft (1) is axially sleeved with a rotating slide seat (5) which rotates synchronously with the main shaft, and the rotating slide seat (5) is located between the active housing seat (2) and the driven housing seat (3); The active housing seat (3) is provided with a tool (6) in the radial direction on the rotating slide (5), and the rotating slide (5) is used to drive the tool (6) to move along the main shaft (1) in both axial and radial directions; the main shaft (1) is provided with a conductive slip ring (7) in the axial direction on the end face facing the active housing seat (2), the outer end of the conductive slip ring (7) is connected to a numerical control system (8) through an electric wire, and the inner end thereof is electrically connected to the rotating slide (5) through a drag chain assembly (9) provided in the main shaft (1); The rotating slide (5) includes a third support ring (51) axially sleeved on the main shaft (1), the third support ring (51) is provided with a Z-direction feed mechanism (52) for driving the third support ring (51) to move axially along the main shaft (1), and the third support ring (51) is also provided with an X-direction feed mechanism (53), and the X-direction feed mechanism (53) is radially opposite to the Z-direction feed mechanism (52), and the X-direction feed mechanism (53) is used to drive the tool (6) to move radially along the main shaft (1); The Z-direction feeding mechanism (52) comprises a traveling gear (521) embedded and rotatably connected to the third supporting ring (51), the traveling gear (521) being meshed and connected with a first rack (11) axially arranged on the outer wall of the main shaft (1), and the length of the first rack (11) is the same as the length of the main shaft (1); the traveling gear (521) is driven by a second driving mechanism (522) arranged on the third supporting ring (51) to rotate circumferentially; The second driving mechanism (522) includes a second servo motor (5221), a power output end of the second servo motor (5221) is axially connected to a second reducer (5222), the second reducer (5222) is tangentially fixedly connected to the outer wall of the third support ring (51), the power output end of the second reducer (5222) is axially connected to a second gear (5223), and the second gear (5223) is meshed with the travel gear (521); The conductive slip ring (7) comprises a dynamic ring (71) axially fixedly connected to the end face of the corresponding main shaft (1); the outer end of the dynamic ring (71) is axially rotatably sleeved with a static ring (72); the static ring (72) is electrically connected to the numerical control system (8) via a first lead wire (721); The drag chain assembly (9) includes an electrical drag chain (91) axially arranged in the main shaft (1), one end of the electrical drag chain (91) is connected to the movable ring (71) of the conductive slip ring (7), and the other end thereof is connected to a ring cable (92); a straight groove (12) is axially penetrated through the outer wall of the main shaft (1), and the ends of the straight groove (12) are respectively connected to torsion rollers (93) through pin shafts, and the two torsion rollers (93) are sleeved with the ring cables (92), and the ring cables (92) do not contact the inner wall of the third support ring (51); the ring cable (92) is electrically connected to the Z-direction feeding mechanism (52) and the X-direction feeding mechanism (53) of the rotating slide (5) through a second lead wire (921).

2. The steam turbine CNC boring machine according to claim 1, characterized in that: The active housing seat (2) comprises a first support ring (21) axially sleeved on the end portion corresponding to the main shaft (1); the first support ring (21) is rotatably connected to the main shaft (1) via a first bearing (22) symmetrically arranged on its end face; a ring gear (23) is axially arranged in the middle portion of the first support ring (21) and does not contact the inner wall thereof; the ring gear (23) is axially fixedly connected to the end portion corresponding to the main shaft (1); the ring gear (23) is driven by a first driving mechanism (24) arranged on the top of the first support ring (21) to rotate circumferentially; The driven housing seat (3) comprises a second support ring (31) axially sleeved on the end portion corresponding to the main shaft (1); the second support ring (31) is rotationally connected to the main shaft (1) via a second bearing (32) symmetrically arranged on its end face.

3. The steam turbine CNC boring machine according to claim 2, characterized in that: The first driving mechanism (24) includes a first servo motor (241) arranged transversely, a power output end of the first servo motor (241) is axially connected to a first reducer (242), a power output end of the first reducer (242) is axially connected to a first gear (243), the first gear (243) is meshed with the annular gear (23), the first gear (243) is externally sleeved with a first shell (244) adapted thereto, the bottom surface of the first shell (244) is fixedly connected and docked with the top surface of the first support ring (21), and the first reducer (242) is axially fixedly connected to the end surface corresponding to the first shell (244).

4. The steam turbine CNC boring machine according to claim 2, characterized in that: The support mechanism (4) comprises a leg plate (41) connected radially and perpendicularly to the first support ring (21) or the second support ring (31); an upper and lower adjusting screw (42) is vertically screwed to the bottom surface of the outer end of the leg plate (41); a limiting groove (431) is provided on the leg plate (41) along its long side direction, and a left and right adjusting screw (43) is provided in the limiting groove (431).

5. The steam turbine CNC boring machine according to claim 1, characterized in that: The X-direction feeding mechanism (53) includes a slide plate (531) that is slidably connected to a slide rail (511) corresponding to one side of the outer wall of the third support ring (51), and one end of the slide plate (531) is installed with the tool (6) through a tool rod (61) axially connected thereto. The bottom surface of the slide plate (531) is provided with a second rack (5311) along its long side direction, and the second rack (5311) is transmission-connected to a transmission assembly (532) arranged at one end of the bottom surface of the slide rail (511). The transmission assembly (532) is driven by a third driving mechanism (533) arranged on one side thereof to rotate circumferentially.

6. The steam turbine CNC boring machine according to claim 5, characterized in that: The transmission assembly (532) includes a second housing (5321), the second housing (5321) is arranged on the end of the bottom surface of the slide rail (511) facing the tool (6), and a transmission shaft (5322) is vertically arranged on the inner wall of the second housing (5321), one end of the transmission shaft (5322) is rotatably connected to a third bearing (5323) correspondingly embedded in the inner wall of the second housing (5321), and the other end is connected to the third driving mechanism (533); an anti-backlash gear (5324) is axially sleeved on the transmission shaft (5322), and the anti-backlash gear (5324) is meshed with the second rack (5311); The third driving mechanism (533) includes a third servo motor (5331), the power output end of the third servo motor (5331) is axially connected to a third reducer (5332), the power output end of the third reducer (5332) is axially connected to a steering gear (5333), and the power output end of the steering gear (5333) is axially connected to the transmission shaft (5322); the third servo motor (5331) is oriented toward the side away from the tool (6).

7. A method for a steam turbine CNC boring machine according to any one of claims 1 to 6, characterized in that: The method is used to bore the tooth tips of the steam baffles in the turbine cylinder in a fully solid cylinder state, and comprises the following steps: Step S1: When the turbine cylinder is in a half-cylinder state, the CNC boring machine is hoisted in, and the support mechanisms (4) at both ends are adjusted and supported on the corresponding bearing box of the turbine; Step S2, aligning the CNC boring machine according to the dimple values ​​at both ends of the part to be processed of the steam turbine; Step S3, installing the tool (6) and setting the tool tip rotation diameter through the rotating slide (5); Step S4, sequentially install the upper half of the steam turbine cylinder body so that it is in a fully filled cylinder state; Step S5: The tool (6) is driven by the active housing (2) and the rotary slide (5) to bore the tooth tips of the steam-blocking plate in sequence.

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