Machining device suitable for turning and grinding spherical surface structure of tilting pad radial bearing of large-size steam turbine

Abstract

The utility model relates to the field of grinding machines, in particular to a machining device suitable for turning and grinding a spherical structure of a tilting pad radial bearing of a large-size steam turbine. The milling machine comprises a main beam, an adapter, a milling head, a rotary table plate, a motor and a belt, the main beam is adjustably mounted on the rotary table plate, the milling head is rotatably mounted on the adapter, the adapter is slidably arranged at one end of the main beam, the motor is fixed at the other end of the main beam, and the belt is connected with the motor and the milling head; the rotary table plate and the main beam are respectively provided with at least one positioning hole, positioning pins are arranged corresponding to the positioning holes, and the positioning pins are linearly inserted into the positioning holes in the rotary table plate and the main beam in a penetrating mode. A thread feeding mechanism is installed on the main beam, and the output end of the thread feeding mechanism is connected with the adapter. The whole device is fixed to a workbench of a numerical control machine tool, and movement of the X axis, the Y axis and the Z axis can be achieved through the workbench; in alignment, sparks generated during friction between the grinding wheel and a workpiece are observed through naked eyes, and feeding of the grinding wheel is more convenient to control through the independently-arranged thread feeding mechanism.

Description

Technical Field

[0001] This utility model relates to the field of grinding machines, specifically to a grinding device suitable for machining spherical structures of large-size turbine tilting pad radial bearings. Background Technology

[0002] Tilting pad radial bearings are a type of bearing used to support rotating shafts. They mainly consist of pads, bearing housings, and related connecting components. There are typically 3-6 pads arranged circumferentially around the rotating shaft. Each pad can swing freely within a certain range, much like a small seesaw. This tilting characteristic allows the pads to automatically adjust their position according to the force applied to the rotating shaft, thereby forming an optimal oil film and ensuring the stability of the rotating shaft during operation. The spherical structure is mainly located between the pads and the bearing housing. The back of the pad is spherical, which mates with a corresponding spherical surface on the bearing housing. This spherical structure allows the pads to swing flexibly. During manufacturing, turning and grinding are key processes for precisely manufacturing this spherical surface. Turning initially forms the approximate shape of the spherical surface, removing most of the excess material; grinding further improves the precision of the spherical surface and reduces surface roughness.

[0003] Current grinding machines for spherical surfaces generally consist of a bed, a worktable, a motor, a grinding wheel, and a feed system. The bed is the foundation of the entire machine, providing stable support. The worktable is used to mount the workpiece. The motor is the key component providing the power for grinding, driving the grinding wheel to rotate at high speed. The grinding wheel is the primary grinding tool, and the feed system controls the feed of the grinding head. A current drawback of this type of grinding machine is that when the grinding wheel cannot be adjusted for alignment, the feed is done through the worktable, which is inconvenient to operate. Utility Model Content

[0004] In view of the above, the purpose of this utility model is to address the problems of the prior art by providing a machining device and method for the spherical structure of large-size tilting pad radial bearings for steam turbines.

[0005] The machining device for large-size tilting radial bearings of steam turbines, comprising a main beam, an adapter, a milling head, a turntable, a motor, and a belt, includes a main beam, an adapter joint, a milling head, a turntable, a motor, and a belt. The main beam is adjustablely mounted on the turntable, and the milling head is rotatably mounted on the adapter joint, which is slidably located at one end of the main beam. The motor is fixed at the other end of the main beam, and the belt connects the motor and the milling head. At least one positioning hole is provided on both the turntable and the main beam, and a positioning pin is provided corresponding to each positioning hole, with the positioning pins inserted linearly into the positioning holes on the turntable and the main beam. A threaded feed mechanism is installed on the main beam, and the output end of the threaded feed mechanism is connected to the adapter joint.

[0006] Furthermore, the turntable plate is provided with at least one arc-shaped groove, and the main beam is provided with at least one bolt, which passes through the arc-shaped groove on the turntable plate into the main beam and is threadedly connected to the main beam.

[0007] Furthermore, the adapter is provided with a bearing seat, and the milling head is rotatably connected to the bearing seat. A connecting plate is provided on the side of the bearing seat, and a rotating shaft is provided on the adapter. A cylindrical pin is provided between the connecting plate and the rotating shaft to fix the connecting plate and the rotating shaft. Two hexagon socket screws are also provided on the connecting plate and located on both sides of the rotating shaft. The hexagon socket screws pass through the connecting plate and are screwed together.

[0008] Furthermore, a cup-shaped grinding wheel or a circular flat grinding wheel is mounted on the milling head.

[0009] Beneficial effects: The entire device of this application is fixed on the worktable of a CNC machine tool, and can move along the X, Y, and Z axes through the worktable itself; alignment is achieved by visually observing the sparks when the grinding wheel rubs against the workpiece; and the separately designed thread feed mechanism makes it easier to control the grinding wheel feed. Attached Figure Description

[0010] Figure 1 This is a front view illustration of this application;

[0011] Figure 2 This is a top view of the present application;

[0012] Figure 3 For along Figure 2 Cross-sectional view of line AA in the middle;

[0013] Figure 4 This is a schematic diagram showing the state of an asymmetric outer sphere during grinding.

[0014] Figure 5 This is a schematic diagram of the state when grinding the inner ball.

[0015] Reference numerals: 1. Main beam; 2. Adapter; 3. Milling head; 4. Turntable plate; 5. Motor; 6. Belt; 7. Arc groove; 8. Bolt; 9. Positioning hole; 10. Positioning pin; 11. Threaded feed mechanism; 12. Shaft seat; 13. Seesaw; 14. Rotating shaft; 15. Cylindrical pin; 16. Socket head screw; 17. Bowl-shaped grinding wheel; 18. Circular flat grinding wheel; 19. Workpiece. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figures 1 to 5 The apparatus shown is suitable for machining the spherical structure of large-size tilting pad radial bearings for steam turbines. It includes a main beam 1, an adapter 2, a milling head 3, a turntable 4, a motor 5, and a belt 6. The main beam 1 is adjustablely mounted on the turntable 4, allowing for the grinding of both asymmetrical and symmetrical outer spheres, thus making the apparatus more versatile. The milling head 3 is rotatably mounted on the adapter 2, which is slidably positioned at one end of the main beam 1, enabling the milling head 3 to be fed independently for easy alignment. The motor 5 is fixed at the other end of the main beam 1, and the belt 6 connects the motor 5 and the milling head 3, providing stable power output through the motor 5.

[0018] In this embodiment, the turntable plate 4 is provided with at least one arc-shaped groove 7, and the main beam 1 is provided with at least one bolt 8. The bolt 8 passes through the arc-shaped groove 7 on the turntable plate 4 into the main beam 1 and is threadedly connected to the main beam 1. The main function of the arc-shaped groove 7 is to limit the rotation range of the main beam 1 and provide it with precise position control. When the main beam 1 rotates, the bolt 8 can fix the main beam 1, thereby avoiding unnecessary shaking or displacement of the main beam 1 during the processing, and improving the accuracy and precision of the processing.

[0019] In this embodiment, the turntable plate 4 and the main beam 1 are each provided with at least one positioning hole 9, and a positioning pin 10 is provided corresponding to the positioning hole 9. The positioning pin 10 is inserted in a straight line through the positioning hole 9 on the turntable plate 4 and the main beam 1. The positioning hole 9 is mainly used for grinding symmetrical outer balls, playing a role in fixing the straight line and improving positioning accuracy. However, when grinding asymmetrical outer balls, the positioning hole 9 does not need to play a role because it is misaligned.

[0020] In this embodiment, a threaded feed mechanism 11 is installed on the main beam 1, and the output end of the threaded feed mechanism 11 is connected to the adapter 2. The threaded feed mechanism 11 is used to drive the adapter 2 for feeding, facilitating alignment. It should be noted that the entire device is fixed on the worktable of the CNC machine tool, and the device itself can move along the X, Y, and Z axes via the worktable. Alignment is achieved by visually observing the sparks generated when the grinding wheel and workpiece 19 rub against each other; therefore, a separate threaded feed mechanism 11 is more convenient to operate. Based on this, as a preferred embodiment, the threaded feed mechanism 11 is mainly powered by a handwheel. A handwheel is a manually controllable rotary tool, used to switch the rotation direction and control the speed. This method can improve the operator's operating comfort and accuracy, thereby ensuring the grinding accuracy.

[0021] In this embodiment, the adapter 2 is provided with a bearing seat 12, and the milling head 3 is rotatably connected to the bearing seat 12. The side of the bearing seat 12 is provided with a connecting plate 13, and the adapter 2 is provided with a rotating shaft 14. A cylindrical pin 15 is provided between the connecting plate 13 and the rotating shaft 14 to fix the connecting plate 13 and the rotating shaft 14. The connecting plate 13 is also provided with two hexagonal screws 16 on both sides of the rotating shaft 14. The hexagonal screws 16 pass through the connecting plate 13 and are screwed together. Tightening and loosening the two hexagonal screws 16 can adjust the vertical tilt of the cup-shaped grinding wheel.

[0022] In this embodiment, a cup-shaped grinding wheel 17 or a circular flat grinding wheel 18 is installed on the milling head 3. The cup-shaped grinding wheel 17 is installed on the milling head 3 when grinding asymmetrical and symmetrical outer spheres, and the circular flat grinding wheel 18 is used when grinding inner spheres.

[0023] The method for machining large-sized spherical structures in tilting pad radial bearings, as described in this embodiment, includes the following steps:

[0024] Step 1: Fix the rotary table 4 onto the worktable of the CNC lathe;

[0025] Step 2: When grinding the symmetrical outer sphere, use cylindrical pin 15 to tighten the positioning pin 10 of the main beam 1 and the turntable plate 4 to fix the straight line, and then use bolt 8 to lock it.

[0026] Step 3: Move the CNC lathe to control the milling head 3 to contact the workpiece 19, and find the correct position by observing the sparks;

[0027] Step 4: Grinding is performed by controlling the linear feed of the adapter 2 through the threaded feed mechanism 11.

[0028] Specifically, in step two, when grinding the asymmetrical outer ball, the positioning pin 10 is not used, the turntable plate 4 is fixed, the main beam 1 is rotated, the required angle is adjusted, and then the bolt 8 is used to lock it.

[0029] Specifically, in step two, when grinding asymmetrical and symmetrical outer spheres, a cup-shaped grinding wheel 17 is installed on the milling head 3, and when grinding the inner sphere, it is replaced with a circular flat grinding wheel 18.

[0030] Specifically, in step three, the alignment method is as follows: connect the seesaw 13 and the milling head 3 together through the cylindrical pin 15, tighten and loosen the two internal hex screws 16, and adjust the vertical tilt of the cup-shaped grinding wheel until the sparks are uniform.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for processing the structure of a large-sized steam turbine tilting-pad radial bearing raceway surface, characterized in that, The utility model relates to a milling machine, including main beam (1), adapter (2), milling head (3), rotary table plate (4), motor (5) and belt (6), the main beam (1) adjustable installation is in rotary table plate (4), the milling head (3) rotatable installation is in adapter (2), and the adapter (2) is slidably arranged in the one end of main beam (1), and the motor (5) is fixed in the other end of main beam (1), and the belt (6) is connected motor (5) with milling head (3), the rotary table plate (4) and main beam (1) each are equipped with at least one positioning hole (9), and the positioning pin (10) is set up to corresponding positioning hole (9), and the positioning pin (10) linearly inserts in the positioning hole (9) on rotary table plate (4) and main beam (1), the main beam (1) is installed with screw feed mechanism (11), and the output of screw feed mechanism (11) is connected with the adapter (2).

2. The apparatus as claimed in claim 1, wherein, The rotary table plate (4) is provided with at least one arc slot (7), and the main beam (1) is provided with at least one bolt (8), and the bolt (8) is inserted into the main beam (1) from the arc slot (7) on the rotary table plate (4) and is screw connected with the main beam (1).

3. The apparatus as claimed in claim 1, wherein, The adapter (2) is provided with an axle seat (12), and the milling head (3) is rotatably connected to the axle seat (12), the axle seat (12) is provided with a seesaw (13) on the side surface, the adapter (2) is provided with a rotating shaft (14), and the seesaw (13) and the rotating shaft (14) are fixed by a cylindrical pin (15) between the seesaw (13) and the rotating shaft (14), the seesaw (13) is further provided with two inner hexagonal screws (16) arranged on both sides of the rotating shaft (14), and the inner hexagonal screws (16) are screwed after penetrating the seesaw (13).

4. The apparatus as claimed in claim 1, wherein, The milling head (3) is provided with a bowl-shaped grinding wheel (17) or a circular flat grinding wheel (18).

Images