A kind of milling equipment for low-pressure outer cylinder of large power steam turbine

Abstract

The application discloses a large-power steam turbine low-pressure outer cylinder body milling equipment and relates to the field of milling machines.The large-power steam turbine low-pressure outer cylinder body milling equipment realizes self-adaptive clamping of a workpiece through cooperation of a sliding table, a clamping groove plate and a clamping plate.The clamping plate adopts a center-concave inclined surface structure, can be accurately attached to the arc-shaped outer wall curved surface of the steam turbine low-pressure outer cylinder and is suitable for positioning requirements of cylinder workpieces of different specifications, thereby solving the problems of poor adaptability and inaccurate positioning of traditional clamps.Meanwhile, the surface of the clamping block is provided with rubber pads, which can effectively buffer the clamping pressure, avoid rigid clamping from damaging the surface of the workpiece and realize multi-point limiting and locking of the clamping columns on both sides, thereby avoiding shaking and deviation of the workpiece during milling.

Description

Technical Field

[0001] This invention specifically relates to a milling device for the low-pressure outer cylinder of a high-power steam turbine, and pertains to the field of milling machine tools. Background Technology

[0002] The low-pressure outer cylinder of a high-power steam turbine is a core large pressure-bearing shell component of a steam turbine generator set. Its machining accuracy, flatness, and structural smoothness directly determine the assembly sealing, operational stability, and power generation efficiency of the unit. It is a key and difficult precision machining component in the field of energy equipment. This type of cylinder has a large overall size, uneven shell wall thickness, complex curved surface and stepped structure, and is made of high-strength alloy steel. During the machining process, problems such as micro-deformation under stress, cutting vibration marks, and dimensional deviations are prone to occur. It places extremely high demands on the clamping stability, machining accuracy, and slag removal capacity of the milling equipment.

[0003] A milling machine for aluminum profiles, disclosed in CN115846736B, includes a milling table, a support column, a four-way sliding milling mechanism, and a stroke-resistant anti-deformation drag-reducing positioning mechanism. The support column is located on the bottom wall of the milling table, the four-way sliding milling mechanism is located on the upper wall of the milling table, and the stroke-resistant anti-deformation drag-reducing positioning mechanism is located on the bottom wall of the milling table. The stroke-resistant anti-deformation drag-reducing positioning mechanism includes a positioning drive mechanism, an expansion fixing mechanism, an anti-offset clamping mechanism, a symmetrical limiting mechanism, and a short-stroke positioning mechanism. This invention belongs to the technical field of milling equipment, specifically referring to a milling machine for aluminum profiles. This invention provides an aluminum profile milling machine that, through a rigid connection structure set on the short side of the aluminum profile, can prevent the clamping structure from deforming and losing its function during long-distance milling by the milling cutter. Furthermore, it can reduce the internal stress of the aluminum profile by utilizing the energy of the hot end.

[0004] In existing equipment, due to the use of a fixed rigid clamping structure, it is impossible to adapt to the arc-shaped outer wall of low-pressure outer cylinders of different specifications for fitting and positioning. During the clamping process, workpiece displacement and loosening under force are prone to occur, and rigid extrusion can also easily cause damage and deformation to the cylinder surface. Summary of the Invention

[0005] To address the aforementioned problems, a technical solution is proposed: a milling machine for the low-pressure outer cylinder block of a high-power steam turbine, comprising:

[0006] A fixed platform is provided, with slide rails fixedly installed on both sides of the fixed platform. A gantry frame is installed on the top of the fixed platform, and the gantry frame is slidably connected to the slide rails. A milling mechanism is installed at the bottom of the gantry frame.

[0007] The fixed platform includes a base plate, on the top of which a support bar is fixedly installed. The support bar is evenly installed axially along the top of the base plate, and a support plate is fixedly installed on the top of the support bar. The top of the support plate has symmetrical rectangular grooves, and a sliding platform is installed at each of these grooves. The bottom of the sliding platform has symmetrically arranged protrusions. The sliding platform slides and adapts to the rectangular grooves of the support plate via these protrusions. A slotted plate is fixedly installed on the top of the sliding platform. Each opposite surface of the slotted plate has a slot, and a clamping plate is fixedly installed at each slot. The opposite surface of the clamping plate is a sloping surface with a central depression, and fixing grooves are evenly distributed on the sloping surface of the clamping plate. A clamping block is fixedly installed in the fixed groove of the clamping plate. The workpiece is self-adaptive clamping is achieved through the cooperation of the sliding table, the slot plate and the clamping plate. The clamping plate adopts a centrally recessed inclined structure, which can accurately fit the curved outer wall surface of the low-pressure outer cylinder of the steam turbine, adapting to the positioning requirements of cylinder workpieces of different specifications, and solving the problems of poor adaptability and inaccurate positioning of traditional fixtures. At the same time, the surface of the clamping block is provided with a rubber pad to effectively buffer the clamping pressure and avoid rigid clamping from damaging the surface of the workpiece. The clamping columns on both sides can realize multi-point limit locking to prevent the workpiece from shaking and shifting during milling. A rubber pad is fixedly installed at the center position of the side of the clamping block away from the clamping plate, and clamping columns are fixedly installed on both sides of the side of the clamping block away from the clamping plate.

[0008] Preferably, the top of the support plate is uniformly provided with grooves, and both ends of the support plate are fixedly installed with slag guide plates. The end of the slag guide plate away from the support plate is inclined downward. The top of the bottom plate is fixedly installed with a hydraulic cylinder. The hydraulic cylinder is symmetrically installed along the center position of the axis of the bottom plate, and the output end of the hydraulic cylinder is fixedly connected to the protrusion of the sliding table. The opposite surfaces of the sliding table are fixedly installed with inclined shovels. The top of the inclined shovel is inclined, and the end away from the sliding table is inclined downward. The inclined surface of the inclined shovel is uniformly provided with arc-shaped protrusions, and the bottom of the inclined shovel is in contact with the top of the support plate.

[0009] Preferably, the gantry includes a slide rail trolley, which is slidably adapted to the slide rail. A connecting block is fixedly installed on the top of each slide rail trolley, a side support column is fixedly installed on the top of each connecting block, and a crossbeam is fixedly installed on the top of each side support column. A groove is formed at the center of the top of the crossbeam, and a first motor is fixedly installed at one end of the crossbeam. Shaft groove blocks are fixedly installed on both sides of the top of the crossbeam, and a lead screw is rotatably installed between the shaft groove blocks. The first motor drives the lead screw to rotate, causing the inner slider to slide precisely along the longitudinal direction of the crossbeam, achieving longitudinal fine-tuning of the processing point. This, combined with the vertical lifting mechanism driven by cylinders on both sides, facilitates vertical lifting. With the guide and adaptation of the inner sliding column and the column groove block, the vertical lifting of the milling head is guaranteed to be stable and without deviation. Through three-dimensional linkage adjustment in the horizontal, vertical and longitudinal directions, it can be aligned with any machining point of the cylinder body, adapting to the milling of complex curved surfaces and irregular structures of the cylinder body. One end of the lead screw is fixedly connected to the output end of the first motor. An inner slider is slidably installed in the sliding groove of the crossbeam. The inner wall of the inner slider is threadedly connected to the outer side of the lead screw. A column groove block is fixedly installed at the bottom of the inner slider. A column groove is opened at the bottom of the column groove block. Cylinders are fixedly installed on both sides of the column groove block. The output end of the cylinder passes through the column groove block and extends to its bottom.

[0010] Preferably, the milling mechanism includes a fixed frame, the two sides of the top of the fixed frame are fixedly connected to the output end of the cylinder, and an inner sliding column is fixedly installed at the center of the top of the fixed frame. The inner sliding column is slidably adapted to the groove of the column slot block. A connecting plate is fixedly installed at the bottom of the fixed frame, and a second motor is fixedly installed at the top of the connecting plate. The output end of the second motor passes through the connecting plate and extends to its bottom. A tool holder is fixedly installed at the output end of the second motor, and a tool shank is fixedly installed at the bottom of the tool holder.

[0011] Preferably, the cutter head is fixedly mounted at the bottom of the tool holder. The center of the bottom of the cutter head is a concave conical surface, and notches are evenly distributed along the edge of the bottom of the cutter head. Fixing grooves are evenly distributed along the outer edge of the cutter head. An inclined guide plate is fixedly mounted at the conical surface of the bottom of the cutter head. The evenly distributed inclined guide plates at the bottom of the cutter head can quickly guide the cutting waste to the outside, preventing waste from accumulating in the workpiece processing area and preventing waste from squeezing and scratching the workpiece and affecting the milling flatness. At the same time, an inclined scraper plate with an arc-shaped protrusion is provided on the side of the sliding table, which can automatically clean the waste in the groove on the top of the support plate as the sliding table moves. The inclined guide plate is located along the center of the cutter head. The cutter head is evenly installed, with its bottom lower than the bottom of the inclined guide plate. Hexagonal cutting blocks are bolted to the fixing slots of the cutter head, and limit blocks are fixedly installed in these slots. A slot is provided on the side of the limit block closest to the hexagonal cutting block. The hexagonal cutting block is detachably fixed to the cutter head fixing slot by bolts, and the slot of the limit block fits snugly to ensure the stability of the cutting block installation and prevent loosening during high-speed cutting. Compared to traditional integral cutters, this structure allows for individual replacement of worn hexagonal cutting blocks without replacing the entire cutter head. The slot of the limit block fits snugly against the outer side of the hexagonal cutting block, and the bottom of the hexagonal cutting block is lower than the bottom of the cutter head.

[0012] This invention provides a milling machine for the low-pressure outer cylinder of a high-power steam turbine, which has the following advantages:

[0013] (i) The workpiece is self-adaptive clamping is achieved by the cooperation of the sliding table, the slot plate and the clamping plate. The clamping plate adopts a central concave inclined structure, which can accurately fit the curved outer wall surface of the low-pressure outer cylinder of the steam turbine, adapt to the positioning requirements of cylinder workpieces of different specifications, and solve the problems of poor adaptability and inaccurate positioning of traditional fixtures. At the same time, the rubber pad on the surface of the clamping block can effectively buffer the clamping pressure and avoid the rigid clamping from damaging the surface of the workpiece. The clamping columns on both sides can realize multi-point limit locking to avoid workpiece shaking and displacement during milling.

[0014] (ii) The first motor drives the lead screw to rotate, which drives the inner slider to slide precisely along the longitudinal direction of the crossbeam, realizing longitudinal fine adjustment of the machining point. Combined with the vertical lifting and lowering of the milling mechanism driven by the cylinders on both sides, and the guide adaptation of the inner sliding column and the column groove block, it ensures that the vertical lifting and lowering of the milling head is stable and without deviation. Through the three-dimensional linkage adjustment of the horizontal, longitudinal and vertical directions, it can be aligned with any machining point of the cylinder body, adapting to the milling of complex curved surfaces and irregular structures of the cylinder body.

[0015] (III) The inclined guide plates evenly arranged at the bottom of the cutter head can quickly guide the cutting waste to the outside, avoid the waste from accumulating in the workpiece processing area, prevent the waste from squeezing and scratching the workpiece and affecting the milling flatness. At the same time, the inclined shovel plate with arc protrusion is set on the side of the sliding table, which can automatically clean the waste in the top groove of the support plate as the sliding table moves.

[0016] (iv) The hexagonal cutting block is detachably fixed in the cutting disc fixing groove by bolts, and is matched with the limit block slot to fit and limit, ensuring the stability of the cutting block installation and avoiding loosening during high-speed cutting. Compared with the traditional integral cutting tool, this structure allows for the replacement of a single worn hexagonal cutting block without replacing the entire cutting disc. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the gantry frame structure of the present invention;

[0019] Figure 3 This is a side view of the gantry structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the milling mechanism of the present invention;

[0021] Figure 5 This is a bottom view of the milling mechanism of the present invention;

[0022] Figure 6 This is a bottom view of a portion of the milling mechanism of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the fixing platform of the present invention;

[0024] Figure 8 This is a sectional view of the structure of the fixing platform of the present invention;

[0025] Figure 9 This is a partial structural schematic diagram of the fixing platform of the present invention;

[0026] Figure 10 This is a partial structural side view of the fixing platform of the present invention.

[0027] In the diagram: 1. Fixed platform; 2. Gantry frame; 3. Milling mechanism; 4. Slide rail; 11. Base plate; 12. Support plate; 13. Clamping plate; 14. Slag guide plate; 15. Support bar; 16. Hydraulic cylinder; 17. Sliding table; 18. Slot plate; 19. Inclined shovel plate; 110. Clamping block; 111. Rubber pad; 112. Clamping column; 21. Slide rail carriage; 22. Connecting block; 23. Side support column; 24. First motor; 25. Crossbeam; 26. Shaft groove block; 27. Lead screw; 28. Inner slider; 29. ​​Cylinder; 210. Column groove block; 31. Fixed frame; 32. Inner sliding column; 33. Second motor; 34. Connecting plate; 35. Tool holder; 36. Tool handle; 37. Tool disc; 38. Hexagonal tool block; 39. Limiting block; 310. Inclined guide plate. Detailed Implementation

[0028] Example 1, Reference Figure 1 and Figures 7 to 10 The present invention provides this technical solution:

[0029] A milling machine for the low-pressure outer cylinder of a high-power steam turbine, comprising:

[0030] A fixed platform 1 is provided, with slide rails 4 fixedly installed on both sides of the fixed platform 1. A gantry frame 2 is installed on the top of the fixed platform 1. The gantry frame 2 is slidably connected to the slide rails 4, and a milling mechanism 3 is installed at the bottom of the gantry frame 2.

[0031] The fixed platform 1 includes a base plate 11, on which a support bar 15 is fixedly installed. The support bars 15 are evenly installed axially on the top of the base plate 11, and a support plate 12 is fixedly installed on the top of the support bars 15. The top of the support plate 12 has symmetrical rectangular grooves, and a sliding table 17 is installed at the rectangular groove of the support plate 12. The bottom of the sliding table 17 has symmetrical protrusions. The sliding table 17 slides and adapts to the rectangular groove of the support plate 12 through the protrusions. A slotted plate 18 is fixedly installed on the top of the sliding table 17. The opposite surfaces of the slotted plate 18 have slots. The base plate 11 bears the overall load, and the support bars 15 evenly arranged axially on the top of the base plate 11 provide stable support for the support plate 12, forming a working bearing base. The operator places the low-pressure outer cylinder body of the steam turbine to be processed on the working area above the support plate 12 and between the two sets of clamping plates 13. The hydraulic cylinders 16 are activated, and the symmetrically arranged hydraulic cylinders 16 extend and retract synchronously, driving the sliding table 17 connected to their output ends. The sliding table 17 slides towards each other along the rectangular groove on the top of the support plate 12 via the bottom protrusion, thus adjusting the distance between the two sets of sliding tables 17. Clamping plates 13 are fixedly installed at the slots of the clamping plate 18. The opposite surfaces of the clamping plates 13 are concave slopes, and fixing grooves are evenly distributed on the slopes of the clamping plates 13. Clamping blocks 110 are fixedly installed at the fixing grooves of the clamping plates 13. A rubber pad 111 is fixedly installed at the center of the clamping block 110 on the side away from the clamping plate 13. The sliding... The platform 17 moves the top slot plate 18 and the inner clamping plate 13 synchronously. The inclined surface of the central recess of the clamping plate 13 is used to fit against the outer wall of the cylinder workpiece. At the same time, the clamping block 110 in the fixed groove of the clamping plate 13 fits against the workpiece. The rubber pad 111 on its surface plays a role in preventing slipping and scratching the workpiece. The clamping columns 112 on both sides further limit and fix it, completing the centering and clamping positioning of the cylinder workpiece to avoid shaking during processing. After the workpiece is clamped, the inclined shovel plate 19 at the bottom of the sliding platform 17 fits tightly against the top of the support plate 12. Its inclined structure and arc protrusion strip can pre-treat the residual debris in the groove of the support plate 12, laying the groundwork for subsequent slag removal. The clamping blocks 110 are fixedly installed on both sides away from the clamping plate 13.

[0032] The top of the support plate 12 is evenly grooved, and both ends of the support plate 12 are fixedly installed with slag guide plates 14. The end of the slag guide plate 14 away from the support plate 12 is inclined downward. The top of the bottom plate 11 is fixedly installed with a hydraulic cylinder 16. The hydraulic cylinder 16 is symmetrically installed along the center of the axis of the bottom plate 11, and the output end of the hydraulic cylinder 16 is fixedly connected to the protrusion of the sliding table 17. The opposite surfaces of the sliding table 17 are fixedly installed with inclined shovel plates 19. The top of the inclined shovel plate 19 is inclined, and the end away from the sliding table 17 is inclined downward. The inclined surface of the inclined shovel plate 19 is evenly provided with arc protrusions, and the bottom of the inclined shovel plate 19 is in contact with the top of the support plate 12.

[0033] Example 2, based on Example 1, with reference to Figures 2 to 3 The gantry 2 includes a slide rail 21, which slides and adapts to the slide rail 4. A connecting block 22 is fixedly installed on the top of each slide rail 21. A side support column 23 is fixedly installed on the top of each connecting block 22, and a crossbeam 25 is fixedly installed on the top of each side support column 23. A groove is formed at the center of the top of the crossbeam 25, and a first motor 24 is fixedly installed at one end of the crossbeam 25. In the gantry 2, the gantry 2 slides along the slide rails 4 on both sides of the fixed platform 1 via the bottom slide rail 21. With proper adaptation, the operator can drive the slide rail 21 to slide laterally along the slide rail 4, completing the overall lateral displacement of the gantry 2 and achieving initial alignment of the milling position. The connecting block 22 and side support column 23 on the top of the slide rail 21 stably support the top crossbeam 25, ensuring the stability of the crossbeam operation. The first motor 24 at one end of the crossbeam 25 is started, driving the lead screw 27 to rotate between the two side shaft groove blocks 26. During the rotation of the lead screw 27, the inner slider 28 is driven to slide longitudinally along the top groove of the crossbeam 25 through threaded transmission, adjusting the longitudinal processing position of the milling mechanism 3 at the bottom of the inner slider 28 to achieve alignment of the workpiece to be processed. Shaft groove blocks 26 are fixedly installed on both sides of the top of the crossbeam 25, and the lead screw 27 is rotatably installed between the shaft groove blocks 26. One end of the lead screw 27 is fixedly connected to the output end of the first motor 24. The inner slider 28 is slidably installed at the groove of the crossbeam 25. The inner wall of the inner slider 28 is threadedly connected to the outer side of the lead screw 27, and the bottom of the inner slider 28 is fixedly installed with a column groove block 21. 0. The bottom of the column groove block 210 is provided with a column groove. The cylinders 29 on both sides of the column groove block 210 extend and retract, driving the fixed frame 31 fixed at the bottom to rise and fall vertically. At the same time, the inner sliding column 32 at the top of the fixed frame 31 slides along the column groove of the column groove block 210 to adapt and play a guiding and limiting role, ensuring that the milling mechanism 3 rises and falls smoothly without deviation and controlling the milling depth. The cylinders 29 are fixedly installed on both sides of the column groove block 210, and the output end of the cylinder 29 passes through the column groove block 210 and extends to its bottom.

[0034] Example 3, based on Examples 1 and 2, with reference to Figures 4 to 6The milling mechanism 3 includes a fixed frame 31. The two sides of the top of the fixed frame 31 are fixedly connected to the output ends of the cylinder 29. An inner sliding column 32 is fixedly installed at the center of the top of the fixed frame 31. The inner sliding column 32 is slidably adapted to the groove of the column groove block 210. A connecting plate 34 is fixedly installed at the bottom of the fixed frame 31. When the second motor 33 is started, the second motor 33 is fixed to the top of the connecting plate 34. Its output end passes through the connecting plate 34 and drives the bottom tool holder 35 and tool shank 36 to rotate at high speed. The tool shank 36 drives the bottom tool holder 35 to rotate at high speed. The disc 37 rotates synchronously at high speed. The hexagonal cutting blocks 38, which are limited by the limit block 39 and fastened by bolts in the fixed groove of the cutter disc 37, rotate with the cutter disc. The hexagonal cutting blocks 38 protruding from the bottom of the cutter disc are used to perform milling cutting operations on the surface of the low-pressure outer cylinder of the steam turbine. The top of the connecting disc 34 is fixedly installed with a second motor 33. The output end of the second motor 33 passes through the connecting disc 34 and extends to its bottom. The output end of the second motor 33 is fixedly installed with a tool holder 35. The bottom of the tool holder 35 is fixedly installed with a tool shank 36.

[0035] A cutter head 37 is fixedly mounted on the bottom of the tool holder 36. The center of the bottom of the cutter head 37 is a concave conical surface, and notches are evenly distributed along the edge of the bottom of the cutter head 37. Fixing grooves are evenly distributed along the outer edge of the cutter head 37. An inclined guide plate 310 is fixedly mounted on the conical surface at the bottom of the cutter head 37. The inclined guide plates 310 are evenly distributed along the center of the cutter head 37. During milling, the inclined guide plates 310 evenly distributed on the conical surface at the bottom of the cutter head 37 guide the iron chips and slag generated during cutting, preventing slag from accumulating at the machining point and affecting the milling accuracy. The slag generated during milling is guided by the inclined guide plates 310. After being guided, the waste falls into the groove at the top of the support plate 12. At the same time, the inclined shovel plate 19 on the side of the sliding table 17 moves slightly with the adjustment of the sliding table, pushing the waste on the surface of the support plate 12 to the guide plates 14 at both ends. The bottom of the cutter head 37 is lower than the bottom of the inclined guide plate 310. Hexagonal cutter blocks 38 are fixedly installed in the fixing groove of the cutter head 37 by bolts. Limiting blocks 39 are fixedly installed in the fixing groove of the cutter head 37. A slot is provided on the side of the limiting block 39 near the hexagonal cutter block 38. The slot of the limiting block 39 fits against the outer side of the hexagonal cutter block 38. The bottom of the hexagonal cutter block 38 is lower than the bottom of the cutter head 37.

[0036] In the fixed platform 1, the base plate 11 bears the overall load, and the support bars 15 evenly distributed axially on the top of the base plate 11 provide stable support for the support plate 12, forming a working bearing base. The operator places the low-pressure outer cylinder body of the steam turbine to be processed in the working area above the support plate 12 and between the two sets of clamping plates 13. The hydraulic cylinder 16 is activated, and the symmetrically arranged hydraulic cylinders 16 extend and retract synchronously, driving the sliding table 17 connected to its output end. Through the bottom protrusion, the sliding table 17 slides towards each other along the rectangular groove on the top of the support plate 12, realizing the spacing adjustment of the two sets of sliding tables 17. The sliding table 17 drives the top slot plate 18 and the inner clamping plate 13 to move synchronously, using the inclined surface of the central recess of the clamping plate 13 to fit together. The outer wall of the cylinder workpiece is clamped, and the clamping block 110 in the fixing groove of the clamping plate 13 fits the workpiece. The rubber pad 111 on its surface plays the role of anti-slip and anti-scratching of the workpiece. The clamping columns 112 on both sides further limit and fix it, and complete the centering clamping and positioning of the cylinder workpiece to avoid processing shaking. After the workpiece is clamped, the inclined shovel plate 19 at the bottom of the sliding table 17 fits tightly against the top of the support plate 12. Its inclined structure and arc protrusion strip can pre-treat the residual debris in the groove of the support plate 12, and prepare for the subsequent slag removal.

[0037] In the gantry 2, the gantry 2 is slidably adapted to the slide rails 4 on both sides of the fixed platform 1 via the bottom slide rail 21. The operator can drive the slide rail 21 to slide laterally along the slide rail 4 to complete the lateral displacement of the entire gantry 2 and achieve the initial alignment of the milling position. The connecting block 22 and side support column 23 at the top of the slide rail 21 stably support the top crossbeam 25 to ensure the stability of the crossbeam operation. The first motor 24 at one end of the crossbeam 25 is started, driving the lead screw 27 to rotate between the two side shaft groove blocks 26. During operation, the inner slider 28 is driven to slide longitudinally along the top groove of the crossbeam 25 via threaded transmission, adjusting the longitudinal processing position of the milling mechanism 3 at the bottom of the inner slider 28 to achieve alignment of the workpiece to be processed. The cylinders 29 on both sides of the column slot block 210 extend and retract, driving the fixed frame 31 at the bottom to rise and fall vertically. At the same time, the inner sliding column 32 at the top of the fixed frame 31 slides along the column slot of the column slot block 210 to adapt and play a guiding and limiting role, ensuring that the milling mechanism 3 rises and falls smoothly without deviation and controlling the milling depth.

[0038] In the milling mechanism 3, the second motor 33 is started. The second motor 33 is fixed to the top of the connecting plate 34. Its output end passes through the connecting plate 34 and drives the bottom tool holder 35 and tool handle 36 to rotate at high speed. The tool handle 36 drives the bottom cutter head 37 to rotate at high speed synchronously. The hexagonal cutting block 38, which is limited by the limit block 39 and fastened by bolts in the fixed groove of the cutter head 37, rotates with the cutter head. The hexagonal cutting block 38 protruding from the bottom of the cutter head is used to perform milling cutting operations on the surface of the low-pressure outer cylinder of the steam turbine. During the milling process, the inclined guide plates 310 evenly arranged on the tapered surface at the bottom of the cutter head 37 guide the iron chips and slag generated by cutting to avoid the accumulation of slag at the processing point, which would affect the milling accuracy. After being guided by the inclined guide plates 310, the slag generated by the milling operation falls into the groove at the top of the support plate 12. At the same time, the inclined shovel plate 19 on the side of the sliding table 17 moves with the fine adjustment of the sliding table to push the slag on the surface of the support plate 12 to the slag guide plates 14 at both ends.

Claims

1. A milling machine for the low-pressure outer cylinder of a high-power steam turbine, characterized in that, include: A fixed platform (1) is provided with slide rails (4) fixedly installed on both sides of the fixed platform (1). A gantry frame (2) is installed on the top of the fixed platform (1). The gantry frame (2) is slidably connected to the slide rails (4), and a milling mechanism (3) is installed at the bottom of the gantry frame (2). The fixed platform (1) includes a base plate (11). A support strip (15) is fixedly installed on the top of the base plate (11). The support strip (15) is evenly installed axially on the top of the base plate (11). A support plate (12) is fixedly installed on the top of the support strip (15). A rectangular groove is symmetrically opened on the top of the support plate (12). A sliding table (17) is installed at the rectangular groove of the support plate (12). A protrusion is symmetrically arranged on the bottom of the sliding table (17). The sliding table (17) slides and adapts to the rectangular groove of the support plate (12) through the protrusion. A card is fixedly installed on the top of the sliding table (17). The slotted plate (18) has slots on its opposite sides, and clamping plates (13) are fixedly installed at the slots of the slotted plate (18). The opposite side of the clamping plate (13) is a sloping surface with a central recess, and a fixing groove is evenly provided on the sloping surface of the clamping plate (13). A clamping block (110) is fixedly installed at the fixing groove of the clamping plate (13). A rubber pad (111) is fixedly installed at the center of the side of the clamping block (110) away from the clamping plate (13), and clamping columns (112) are fixedly installed on both sides of the side of the clamping block (110) away from the clamping plate (13).

2. The milling equipment for the low-pressure outer cylinder of a high-power steam turbine according to claim 1, characterized in that: The top of the support plate (12) is uniformly provided with grooves, and both ends of the support plate (12) are fixedly installed with slag guide plates (14), with the end of the slag guide plate (14) away from the support plate (12) tilting downward. A hydraulic cylinder (16) is fixedly installed on the top of the base plate (11). The hydraulic cylinder (16) is symmetrically installed along the center of the axis of the base plate (11), and the output end of the hydraulic cylinder (16) is fixedly connected to the protrusion of the sliding table (17).

3. The milling equipment for the low-pressure outer cylinder of a high-power steam turbine according to claim 2, characterized in that: The opposite sides of the sliding table (17) are fixedly equipped with inclined shovels (19), the top of the inclined shovels (19) is inclined, and the end away from the sliding table (17) is inclined downward. The inclined shovel plate (19) is uniformly provided with arc-shaped protrusions on its inclined surface, and the bottom of the inclined shovel plate (19) is in contact with the top of the support plate (12).

4. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 3, characterized in that: The gantry (2) includes a slide rail (21), which is slidably adapted to the slide rail (4), and a connecting block (22) is fixedly installed on the top of the slide rail (21), a side support column (23) is fixedly installed on the top of the connecting block (22), and a crossbeam (25) is fixedly installed on the top of the side support column (23).

5. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 4, characterized in that: A sliding groove is provided at the center of the top of the crossbeam (25), and a first motor (24) is fixedly installed at one end of the crossbeam (25). Shaft groove blocks (26) are fixedly installed on both sides of the top of the crossbeam (25), and a lead screw (27) is rotatably installed between the shaft groove blocks (26). One end of the lead screw (27) is fixedly connected to the output end of the first motor (24).

6. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 5, characterized in that: An inner slider (28) is slidably installed in the groove of the crossbeam (25). The inner wall of the inner slider (28) is threadedly connected to the outer side of the lead screw (27). A column groove block (210) is fixedly installed at the bottom of the inner slider (28). A column groove is opened at the bottom of the column groove block (210). A cylinder (29) is fixedly installed on both sides of the column groove block (210). The output end of the cylinder (29) passes through the column groove block (210) and extends to its bottom.

7. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 6, characterized in that: The milling mechanism (3) includes a fixed frame (31), the two sides of the top of the fixed frame (31) are fixedly connected to the output end of the cylinder (29), and an inner sliding column (32) is fixedly installed at the center of the top of the fixed frame (31). The inner sliding column (32) is slidably adapted to the groove of the column slot block (210), and a connecting plate (34) is fixedly installed at the bottom of the fixed frame (31).

8. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 7, characterized in that: A second motor (33) is fixedly installed on the top of the connecting plate (34). The output end of the second motor (33) passes through the connecting plate (34) and extends to its bottom. A tool holder (35) is fixedly installed on the output end of the second motor (33). A tool handle (36) is fixedly installed on the bottom of the tool holder (35).

9. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 8, characterized in that: The bottom of the tool holder (36) is fixedly mounted with a tool disc (37). The center of the bottom of the tool disc (37) is a concave conical surface, and the edge of the bottom of the tool disc (37) is uniformly provided with notches. The outer edge of the tool disc (37) is uniformly provided with fixing grooves. An inclined guide plate (310) is fixedly mounted on the conical surface at the bottom of the tool disc (37). The inclined guide plate (310) is uniformly installed along the center of the tool disc (37). The bottom of the tool disc (37) is lower than the bottom of the inclined guide plate (310).

10. A milling machine for the low-pressure outer cylinder of a high-power steam turbine according to claim 9, characterized in that: Hexagonal blade blocks (38) are fixedly installed in the fixing slots of the cutter head (37) by bolts. Limiting blocks (39) are fixedly installed in the fixing slots of the cutter head (37). A slot is provided on the side of the limiting block (39) near the hexagonal blade block (38). The slot of the limiting block (39) fits against the outer side of the hexagonal blade block (38). The bottom of the hexagonal blade block (38) is lower than the bottom of the cutter head (37).

Images