An industrial steam turbine blade root pin hole processing device

Abstract

The utility model discloses an industrial steam turbine blade root pin hole processingequipment, including main shaft box, sliding seat and base, be equipped with rack on the sliding seat, be equipped with the second gear of meshing with rack on the main shaft box, the main shaft box can be along with first direction removal relative to the sliding seat, the sliding seat can be along with second direction removal relative to the base, one side of main shaft box is equipped with feed mechanism, the feed mechanism includes rotary shaft, sets up rotary sleeve outside rotary shaft and sets up the support sleeve of rotary shaft and can be removed relative to rotary sleeve, is equipped with matched transmission tooth on support sleeve and rotary sleeve, and one end of rotary shaft is equipped with first gear, and first gear is through idler wheel and the second gear on main shaft box interlock each other, and the purpose that reaches the switching manual feed mode and automatic feed mode through pulling out or pushing feed handle is realized through support sleeve and rotary sleeve interlock and disconnect, thereby will automatic feed and manual feed mechanism carry out integration, and simplify mechanism.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine processing technology, specifically to a device for processing root pin holes of industrial steam turbine blades. Background Technology

[0002] When the blade roots of the final stage blades and regulating stage blades of an industrial steam turbine are assembled using forked blade roots, the forked blade roots are inserted into the rim of the main shaft, and two blade root pin holes are machined using an industrial steam turbine blade root pin hole machining device. They are then connected by tapered pins with a taper of 1:100.

[0003] The existing equipment connects the spindle head and slide with a lead screw, and the slide and base are also connected by a lead screw. During machining, the spindle head is moved to the required position via the Z-axis automatic feed motor and the X-axis feed handle, and the tool is clamped on the spindle. After starting the spindle motor, drilling begins, and drilling is performed by rotating the feed handle. Rotating the feed handle allows the spindle to extend in and out of the spindle head, and the gear shift handle adjusts the spindle speed. The existing technology uses two independent mechanisms for automatic and manual feed, resulting in a complex and bulky structure. It cannot provide axial force to the spindle during machining via automatic feed; switching between automatic and manual feed modes is not possible on the equipment itself, requiring operation via a control panel; and automatic feed cannot be stopped immediately in emergency situations. Utility Model Content

[0004] To solve the above technical problems, this utility model provides an industrial steam turbine blade root pin hole processing device that integrates automatic and manual feeding mechanisms.

[0005] The present invention adopts the following technical solution:

[0006] An industrial steam turbine blade root pin hole machining device includes a main shaft box, a slide, and a base. The slide is equipped with a rack, and the main shaft box is equipped with a second gear that meshes with the rack. The main shaft box can move relative to the slide along a first direction, and the slide can move relative to the base along a second direction. Through the three-layer structure of the main shaft box, slide, and base, a composite movement of the main shaft box along the first direction (Z-axis direction) and the main shaft box and slide simultaneously along the second direction (X-axis direction) can be realized, expanding the machining range and adapting to complex hole requirements.

[0007] Preferably, a feed mechanism is provided on one side of the spindle box. The feed mechanism includes a rotating shaft, a rotating sleeve disposed outside the rotating shaft, and a support sleeve disposed on the rotating shaft and movable relative to the rotating sleeve. The support sleeve and the rotating sleeve are provided with matching transmission teeth. A first gear is provided at one end of the rotating shaft. The first gear meshes with a second gear on the spindle box through an idler gear. The switching between manual feed mode and automatic feed mode is realized by the movement of the support sleeve.

[0008] Preferably, the feeding mechanism further includes a feeding motor, a worm gear connected to the drive end of the feeding motor, and a worm wheel matched with the worm gear. The worm wheel is located at the end of the rotating sleeve. The worm wheel and worm gear transmission has self-locking properties to prevent displacement deviation caused by reverse force during processing and to ensure feeding accuracy.

[0009] Preferably, a rolling bearing is provided between the rotating shaft and the rotating sleeve. The rolling bearing reduces frictional loss between the rotating shaft and the rotating sleeve, thereby improving transmission efficiency and service life.

[0010] Preferably, the support sleeve is movable relative to the rotating sleeve, causing the processing device to have a first state and a second state. In the first state, the transmission teeth of the support sleeve and the rotating sleeve mesh with each other, and the rotation of the rotating sleeve drives the rotating shaft to rotate through the support sleeve, which is the automatic feed mode of the processing device.

[0011] Preferably, in the second state, the transmission teeth of the support sleeve and the rotating sleeve are disengaged, and the rotating sleeve and the support sleeve rotate independently, which is the manual feed mode of the processing device.

[0012] Preferably, a slider is provided below the spindle box, and a linear guide rail is provided on the slide block. The spindle box is slidably mounted on the slide block through the slider and the linear guide rail. The slider and the linear guide rail cooperate to provide high rigidity guidance, withstand the lateral component of the cutting force, and prevent the spindle box from wobbling.

[0013] Preferably, the spindle box is provided with an output spindle, a spindle motor, an input shaft connected to the spindle motor, and several transmission shafts. Adjacent transmission shafts are provided with meshing gears. The spindle speed range is expanded by multiple parallel transmission shafts and corresponding gear structures.

[0014] Preferably, the spindle box is equipped with a first drive shaft, a second drive shaft, a third drive shaft, a fourth drive shaft, and a fifth drive shaft. The output spindle is equipped with a first drive gear. The first drive shaft is equipped with a second drive gear that meshes with the first drive gear. The second drive shaft is equipped with a third drive gear that meshes with the second drive gear. The third drive shaft is equipped with a fourth drive gear, a fifth drive gear, a sixth drive gear, and a seventh drive gear. The fourth drive shaft is equipped with an eighth drive gear. The fifth drive shaft is equipped with a ninth drive gear that meshes with the eighth drive gear. This increases the spindle speed range to 6 gears, and the maximum spindle speed can reach 1900 r / min. Each speed range can be infinitely variable between 1 and 10 times the spindle speed through a servo controller, covering all speeds between 25 and 1900 r / min. This overcomes the predicament of existing technologies where the maximum speed is too low when there is high torque, making it impossible to simultaneously meet the requirements for drilling and reaming blade root pin holes of both large and small diameters. Thus, a single machine can cover the processing needs of blade root pin holes from small to large.

[0015] Preferably, a first sliding gear is slidably fitted on the second drive shaft. The first sliding gear has teeth that mesh with the sixth and seventh drive gears respectively, realizing a two-speed function and improving the speed variation range of the output spindle.

[0016] Preferably, a second sliding gear is slidably fitted on the fourth transmission shaft. The second sliding gear has tooth profiles that mesh with the fourth, fifth, and sixth transmission gears respectively, which improves the speed variation range of the output spindle and realizes the three-speed function, thus improving the speed variation range of the output spindle.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model achieves the purpose of switching between manual feed mode and automatic feed mode by pulling out or pushing the feed handle through the engagement and disengagement of the support sleeve and the rotating sleeve. This integrates the automatic feed and manual feed mechanisms, simplifies the mechanism, and allows the automatic feed of the spindle to be stopped immediately by pulling out the feed handle in case of emergency.

[0019] 2. Existing blade root pin hole machining devices cannot simultaneously handle high spindle speed and high torque: devices with high torque, capable of drilling and reaming large diameter blades, cannot provide high spindle speeds, thus making it impossible to machine the blade root pin holes of small-diameter regulating stage blades; conversely, devices with high speeds cannot machine the large-diameter final-stage blade blade root pin holes that require high torque. This invention, through redesigning the gear transmission ratio within the spindle box, changing the spindle motor to a servo motor, and directly connecting the spindle motor to the input shaft, increases the spindle output torque with minimal change in spindle box volume. This improves the diameter of the blade root pin holes that the machining device can drill and ream, thereby enhancing the machining capability of the blade root pin hole machining device.

[0020] 3. This utility model has both high torque and high speed on the spindle. By replacing the spindle motor with a servo motor and adding sliding gears, the spindle speed range is increased to 6 levels, with a maximum spindle speed of 1900 r / min. Each speed range can be infinitely variable between 1 and 10 times through the servo controller, covering all speeds between 25 and 1900 r / min. This overcomes the predicament of existing technology where the maximum speed is too low when having high torque, making it impossible to simultaneously meet the requirements for drilling and reaming blade root pin holes of both large and small diameters. Thus, a single machine can cover the processing needs of blade root pin holes from small to large. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the blade root pin hole machining device.

[0022] Figure 2 Side view of the spindle box.

[0023] Figure 3 This is the unfolded diagram of the spindle box.

[0024] Figure 4 This is a sectional view of the worm gear pair in the feed mechanism.

[0025] Figure 5 This is a sectional view of the feed mechanism.

[0026] Figure 6 This is a schematic diagram of the transmission part of the feed mechanism.

[0027] Figure 7 This is a schematic diagram of part of the transmission structure of the gear shift lever.

[0028] Figure 8 This is a schematic diagram of another part of the transmission structure of the gear shift lever.

[0029] In the diagram, the components are: 1. Shift lever; 2. Output spindle; 3. Spindle box; 4. Feed lever; 5. Slide; 6. Handle; 7. Base; 8. Spindle motor; 9. Feed motor; 10. Slider; 11. Linear guide; 12. Rack; 13. First transmission gear; 14. Second transmission gear; 15. First transmission shaft; 16. Third transmission gear; 17. Fourth transmission gear; 18. Fifth transmission gear; 19. Third transmission shaft; 20. Second sliding gear; 21. Eighth transmission gear; 22. Ninth transmission gear; 23. Input shaft; 24. First sliding gear; 25. Second transmission shaft; 26. Sixth transmission gear; 27. Seventh transmission gear; 27. Fourth transmission shaft; 28. Fifth transmission shaft; 29. ​​Worm; 30. Worm wheel; 31. Support sleeve; 32. Rotating sleeve; 33. Rotating shaft; 34. First gear; 35. Second gear; 36. Idler wheel; 37. First shift fork; 38. Second shift fork; 39. First positioning shaft; 40. Second positioning shaft; 41. Detailed Implementation

[0030] To facilitate understanding of the technical solution of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figure 1-2 As shown, an industrial steam turbine blade root pin hole machining device includes a main shaft box 3, a slide 5, and a base 7. The slide 5 is provided with a rack 12, and the main shaft box 3 is provided with a second gear 36 that meshes with the rack 12. The main shaft box 3 can move relative to the slide 5 along a first direction, and the slide 5 can move relative to the base 7 along a second direction. Through the three-layer structure of the main shaft box, the slide, and the base, the device realizes the compound movement of the main shaft box along the first direction (Z-axis direction) and the main shaft box and the slide simultaneously along the second direction (X-axis direction), thus expanding the machining range and adapting to complex hole requirements.

[0033] like Figure 4-6As shown, a feed mechanism is provided on one side of the spindle box 3. The feed mechanism includes a rotating shaft 34, a rotating sleeve 33 disposed outside the rotating shaft 34, and a support sleeve 32 disposed on the rotating shaft 34 and movable relative to the rotating sleeve 33. A rolling bearing is provided between the rotating shaft 34 and the rotating sleeve 33. The rolling bearing reduces frictional loss between the rotating shaft 34 and the rotating sleeve, improving transmission efficiency and service life. The support sleeve 32 and the rotating sleeve 33 are provided with matching transmission teeth. That is, the support sleeve 32 can move relative to the rotating sleeve 33, causing the transmission teeth of the support sleeve 32 and the rotating sleeve 33 to engage and disengage. A keyway and a key are provided between the support sleeve 32 and the rotating shaft 34. The length of the keyway is longer than the length of the key. That is, the rotation of the support sleeve 32 can drive the rotation of the rotating shaft 34, and the movement of the support sleeve 32 will not drive the rotation shaft 34 to move. One end of the rotating shaft 34 is provided with a first gear 35. The first gear 35 meshes with the second gear 36 on the main spindle box 3 through the idler wheel 37. The manual feed mode and the automatic feed mode are switched by the movement of the support sleeve 32.

[0034] Specifically, the feeding mechanism further includes a feed motor 9, a worm gear 30 connected to the drive end of the feed motor 9, and a worm wheel 31 matched with the worm gear 30. The worm wheel 31 is located at the end of the rotating sleeve 33. The worm gear transmission has self-locking properties to prevent displacement deviation caused by reverse force during processing and ensure feed accuracy. One end of the support sleeve 32 is provided with a feed handle 4. The support sleeve 32 can move relative to the rotating sleeve 33, causing the processing device to have a first state and a second state. In the first state, the transmission teeth of the support sleeve 32 and the rotating sleeve 33 mesh with each other, and the rotation of the rotating sleeve 33 drives the rotating shaft 34 to rotate through the support sleeve 32, which is the automatic feed mode of the processing device. In the second state, the transmission teeth of the support sleeve 32 and the rotating sleeve 33 disengage, and the rotating sleeve 33 and the support sleeve 32 rotate independently, which is the manual feed mode of the processing device.

[0035] When the output spindle needs automatic feeding, the feed handle 4 is pushed inward to the support sleeve 32. The feed motor 9 drives the worm gear pair to rotate. Since the worm gear 31 is rigidly connected to the rotating sleeve 33, the rotating sleeve 33 also rotates with the worm gear 31. As the support sleeve 32 is pushed inward, the transmission teeth on the outer side of the support sleeve 32 and the transmission teeth on the inner side of the rotating sleeve 33 mesh with each other. The rotating sleeve 33 drives the support sleeve 32 to rotate. At the same time, the rotating shaft 34 and the first gear 35 on the rotating shaft 34 also rotate with the support sleeve 32. The first gear 35 on the rotating shaft 34 drives the idler gear. 37 drives the gear and rack pair on the spindle box 3 and slide 5 to move the spindle box 3 and output spindle 2 in the Z direction; when the output spindle needs to be manually fed, the feed handle 4 is pulled out of the support sleeve 32, and the transmission teeth on the outside of the support sleeve 32 and the transmission teeth on the inside of the rotating sleeve 33 are disengaged. At this time, the rotating shaft 34, the support sleeve 32 and the rotating sleeve 33, the worm gear pair, etc. are disconnected. The feed handle 4 is manually rotated, and the first gear 35 on the rotating shaft 34 drives the gear and rack pair on the spindle box 3 and slide 5 through the idler gear 37 to move the spindle box 3 and output spindle 2 in the Z direction.

[0036] The spindle box 3 is provided with a slider 10 below it and a linear guide rail 11 is provided on the slide block 5. The spindle box 3 is slidably connected to the slide block 5 through the slider 10 and the linear guide rail 11. The slider and the linear guide rail cooperate to provide high rigidity guidance, withstand the lateral component of the cutting force, and prevent the spindle box from swaying.

[0037] The spindle box 3 is equipped with an output spindle 2, a spindle motor 8, an input shaft 23 connected to the spindle motor 8, and several transmission shafts. Adjacent transmission shafts are equipped with meshing gears. The spindle speed range is expanded by multiple parallel transmission shafts and corresponding gear structures.

[0038] like Figure 3As shown, the spindle housing 3 is equipped with a first drive shaft 15, a second drive shaft 25, a third drive shaft 19, a fourth drive shaft 28, and a fifth drive shaft 29. The output spindle 2 is equipped with a first drive gear 13. The first drive shaft 15 is equipped with a second drive gear 14 that meshes with the first drive gear 13. The second drive shaft 25 is equipped with a third drive gear 16 that meshes with the second drive gear 14. The third drive shaft 19 is equipped with a fourth drive gear 17, a fifth drive gear 18, a sixth drive gear 26, and a seventh drive gear 27. The fourth drive shaft 28 is equipped with an eighth drive gear 21. The fifth drive shaft 29 is equipped with a ninth drive gear 22 that meshes with the eighth drive gear 21. The second drive shaft 25 is slidably fitted with a first sliding gear 24, which is equipped with gears that mesh with the sixth drive shaft 26 and the seventh drive gear 27. The tooth profiles of the moving gear 26 and the seventh transmission gear 27 meshing are provided. The fourth transmission shaft 28 is slidably fitted with a second sliding gear 20. The second sliding gear 20 is provided with tooth profiles that mesh with the fourth transmission gear 17, the fifth transmission gear 18 and the sixth transmission gear 26 respectively, so that the spindle speed gears are increased to 6 gears. The maximum spindle speed can reach 1900 r / min. In use, the specific transmission ratio can be adjusted by changing the position of the first sliding gear 24 and the second sliding gear 20. Each speed gear can be continuously variable between 1 and 10 times the spindle speed through the servo controller, covering all speeds between 25 and 1900 r / min. This changes the predicament of the existing technology where the maximum speed is too low when there is high torque, and it cannot meet the drilling and reaming of large and small diameter blade root pin holes at the same time. Thus, a single machine can cover the processing needs of blade root pin holes from small to large.

[0039] like Figure 7-8As shown, the spindle box 3 is equipped with a shift handle 1, which adjusts the positions of the first sliding gear 24 and the second sliding gear 20. The shift handle 1 has two rotatable parts, which respectively drive the first shift fork 38 to move axially on the first positioning shaft 40 and drive the second shift fork 39 to move axially on the second positioning shaft 41. The first shift fork 38 is inserted into the first sliding gear 24, and the two are fixed relative to each other. The second shift fork 39 is inserted into the second sliding gear 20, and the two are fixed relative to each other. The first shift fork 38 and the second shift fork 39 contain springs and ball bearings. The first positioning shaft 40 and the second positioning shaft 41 are machined with positioning grooves for positioning the corresponding shift forks. The first shift fork 38 drives the first sliding gear 24 to move to the corresponding groove on the first positioning shaft 40, where it engages with the sixth transmission gear 26 or the seventh transmission gear 27. The second shift fork 39 drives the second sliding gear 20 to move to the corresponding groove on the second positioning shaft 41, where it engages with the fourth transmission gear 17, the fifth transmission gear 18, or the sixth transmission gear 26. Adjusting the position of the sliding gear via the shift lever 1, the shift fork, and the drive shaft is existing technology, and its specific structure and implementation will not be described in detail.

[0040] The above are merely preferred embodiments of this utility model. The scope of protection of this utility model is defined by the scope of the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of this utility model should also be considered as protection within the scope of this utility model.

Claims

1. A device for machining pin holes at the root of an industrial steam turbine blade, characterized in that, The assembly includes a spindle box (3), a slide (5), and a base (7). The slide (5) is provided with a rack (12), and the spindle box (3) is provided with a second gear (36) that meshes with the rack (12). The spindle box (3) can move relative to the slide (5) in a first direction, and the slide (5) can move relative to the base (7) in a second direction. A feed mechanism is provided on one side of the spindle box (3). The feed mechanism includes a rotating shaft (34), a rotating sleeve (33) disposed outside the rotating shaft (34), and a support sleeve (32) disposed on the rotating shaft (34) and movable relative to the rotating sleeve (33). The support sleeve (32) and the rotating sleeve (33) are provided with matching transmission teeth. A first gear (35) is provided at one end of the rotating shaft (34). The first gear (35) meshes with the second gear (36) on the spindle box (3) through an idler gear (37).

2. The industrial steam turbine blade root pin hole processing device according to claim 1, characterized in that, The feeding mechanism also includes a feeding motor (9), a worm (30) connected to the drive end of the feeding motor (9), and a worm wheel (31) matched with the worm (30). The worm wheel (31) is located at the end of the rotating sleeve (33).

3. The industrial steam turbine blade root pin hole processing device according to claim 1, characterized in that, A rolling bearing is provided between the rotating shaft (34) and the rotating sleeve (33).

4. The industrial steam turbine blade root pin hole processing device according to claim 1, characterized in that, The support sleeve (32) can move relative to the rotating sleeve (33) to cause the processing device to have a first state and a second state. In the first state, the transmission teeth of the support sleeve (32) and the rotating sleeve (33) mesh with each other, and the rotating sleeve (33) rotates through the support sleeve (32) to drive the rotating shaft (34) to rotate.

5. The industrial steam turbine blade root pin hole processing device according to claim 4, characterized in that, In the second state, the transmission teeth of the support sleeve (32) and the rotating sleeve (33) are disengaged, and the rotating sleeve (33) and the support sleeve (32) rotate independently.

6. The industrial steam turbine blade root pin hole processing device according to claim 1, characterized in that, The spindle box (3) is provided with a slider (10) below it, and a linear guide rail (11) is provided on the slide block (5). The spindle box (3) is slidably engaged with the linear guide rail (11) on the slide block (5) through the slider (10).

7. The industrial steam turbine blade root pin hole processing device according to claim 1, characterized in that, The spindle box (3) is provided with an output spindle (2), a spindle motor (8), an input shaft (23) connected to the spindle motor (8), and several transmission shafts, with meshing gears on adjacent transmission shafts.

8. The industrial steam turbine blade root pin hole processing device according to claim 7, characterized in that, The main shaft box (3) is provided with a first drive shaft (15), a second drive shaft (25), a third drive shaft (19), a fourth drive shaft (28) and a fifth drive shaft (29). The output main shaft (2) is provided with a first drive gear (13). The first drive shaft (15) is provided with a second drive gear (14) that meshes with the first drive gear (13). The second drive shaft (25) is provided with a third drive gear (16) that meshes with the second drive gear (14). The third drive shaft (19) is provided with a fourth drive gear (17), a fifth drive gear (18), a sixth drive gear (26) and a seventh drive gear (27). The fourth drive shaft (28) is provided with an eighth drive gear (21). The fifth drive shaft (29) is provided with a ninth drive gear (22) that meshes with the eighth drive gear (21).

9. The industrial steam turbine blade root pin hole processing device according to claim 8, characterized in that, The second drive shaft (25) is slidably fitted with a first sliding gear (24), which has teeth that mesh with the sixth drive gear (26) and the seventh drive gear (27) respectively.

10. The industrial steam turbine blade root pin hole processing device according to claim 8, characterized in that, The fourth transmission shaft (28) is slidably fitted with a second sliding gear (20), which has teeth that mesh with the fourth transmission gear (17), the fifth transmission gear (18) and the sixth transmission gear (26) respectively.

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