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

Abstract

The invention relates to the field of grinding machines, in particular to a machining device suitable for turning and grinding a spherical structure of a large-size tilting pad radial bearing. 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. According to the device, asymmetric outer balls and symmetric outer balls can be ground through the adjustable main beam, so that the device is more universal.

Description

Technical Field

[0001] The present invention relates to the field of grinding machines, and particularly to a turning and grinding spherical surface structure processing device and method applicable to large-sized tilting pad journal bearings. Background Art

[0002] A tilting pad journal bearing is a type of bearing used to support a rotating shaft. It mainly consists of pad blocks, a bearing housing, and related connecting components. The pad blocks are usually multiple, generally 3 - 6, and these pad blocks are circumferentially distributed around the rotating shaft. Each pad block can swing freely within a certain range, just like small seesaws. This tilting characteristic enables the pad blocks to automatically adjust their positions according to the force conditions of the rotating shaft, thereby forming an optimal oil film to ensure the stability of the rotating shaft during operation. The spherical surface structure is mainly located between the pad blocks and the bearing housing of the tilting pad journal bearing. The back surface of the pad block is a spherical shape, which mates with the corresponding spherical surface on the bearing housing. This spherical surface structure enables the pad blocks to swing flexibly. During the processing, the turning and grinding processes are the key means for precisely manufacturing this spherical surface. By turning, the general shape of the spherical surface can be initially formed, removing most of the surplus; grinding is to further improve the accuracy of the spherical surface and reduce the surface roughness.

[0003] The current turning and grinding spherical surface structure processing device generally includes a bed, a workbench, a motor, a grinding wheel, and a feed system; the bed of the grinding machine is the basic part of the entire device, which provides stable support, the workbench is used to mount the workpiece, the motor is the key part providing the grinding power, which drives the grinding wheel to rotate at high speed, the grinding wheel is the main tool for grinding, and the feed system is used to control the feed of the grinding head. The current drawback of this grinding machine is that the grinding wheel cannot be adjusted, and it can only process symmetric outer spheres, with poor applicability. Summary of the Invention

[0004] In view of the above, the purpose of the present invention is to provide a turning and grinding spherical surface structure processing device and method applicable to large-sized tilting pad journal bearings in view of the problems of the prior art.

[0005] The turning and grinding spherical surface structure processing device applicable to large-sized tilting pad journal bearings in this solution includes a main beam, a swivel joint, a milling head, a turntable plate, a motor, and a belt. The main beam is adjustably installed on the turntable plate, the milling head is rotatably installed on the swivel joint, the swivel joint 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 connects the motor and the milling head.

[0006] Furthermore, at least one arc-shaped groove is provided on the turntable plate, and at least one bolt is provided on the main beam. The bolt penetrates from the arc-shaped groove on the turntable plate into the main beam and is threadedly connected to the main beam.

[0007] Furthermore, at least one positioning hole is provided on each of the turntable plate and the main beam, and a positioning pin is provided corresponding to the positioning hole. The positioning pin is linearly inserted into the positioning holes on the turntable plate and the main beam.

[0008] Furthermore, a threaded feed mechanism is installed on the main beam, and the output end of the threaded feed mechanism is connected to the adapter.

[0009] Furthermore, a shaft seat is provided on the adapter, the milling head is rotatably connected to the shaft seat, a connecting plate is provided on the side of the shaft seat, a rotating shaft is provided on the adapter, and 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 head cap screws are also provided on the connecting plate on both sides of the rotating shaft, and the hexagon socket head cap screws penetrate the connecting plate and then are screwed.

[0010] Furthermore, a cup-shaped grinding wheel or a circular flat grinding wheel is installed on the milling head.

[0011] A machining method applicable to the turning and grinding of the spherical surface structure of a tilting pad journal bearing for large sizes, the machining method comprising the following steps: Step 1: Fix the turntable plate on the workbench of the CNC lathe; Step 2: When grinding the symmetric outer sphere, use a cylindrical pin to position and lock the main beam and the turntable plate to play a role in determining a straight line, and then lock it with bolts; Step 3: Control the milling head to contact the workpiece, and find the correct position by observing the sparks; Step 4: Control the linear feed of the adapter through the threaded feed mechanism for grinding.

[0012] Furthermore, in Step 2, when grinding the asymmetric outer sphere, the positioning pin is not used, the turntable plate is fixed, and the main beam rotates to adjust to the required angle, and then it is locked with bolts.

[0013] Furthermore, in Step 2, a cup-shaped grinding wheel is installed on the milling head when grinding the asymmetric outer sphere and the symmetric outer sphere, and it is replaced with a circular flat grinding wheel when grinding the inner sphere.

[0014] Furthermore, in Step 3, the alignment method is as follows: Connect the seesaw and the milling head together through a cylindrical pin, tighten and loosen the two hexagon socket head cap screws to adjust the inclination of the cup-shaped grinding wheel in the vertical direction until the sparks are uniform.

[0015] Beneficial effects: The present application can realize the grinding of asymmetric outer spheres and symmetric outer spheres through the adjustable main beam, which can make the device more universal. Description of the Drawings

[0016] Figure 1 is the front view schematic diagram of the present application; Figure 2 is the top view schematic diagram of the present application; Figure 3 is alongFigure 2 Cross-sectional view along line A-A; Figure 4 Schematic diagram of the state when grinding an asymmetric outer sphere; Figure 5 Schematic diagram of the state when grinding an inner sphere.

[0017] Reference numerals: main beam 1, adapter 2, milling head 3, turntable plate 4, motor 5, belt 6, arc groove 7, bolt 8, positioning hole 9, positioning pin 10, screw feed mechanism 11, shaft seat 12, seesaw 13, rotating shaft 14, cylindrical pin 15, hexagon socket head screw 16, cup-shaped grinding wheel 17, circular flat grinding wheel 18, workpiece 19. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Referring to Figures 1 to 5 The machining device for the spherical surface structure of a tilting pad journal bearing applicable to large sizes shown in the figure includes a main beam 1, an adapter 2, a milling head 3, a turntable plate 4, a motor 5 and a belt 6; the main beam 1 is adjustably installed on the turntable plate 4, and the main beam 1 can be adjusted as needed to realize the grinding of asymmetric outer spheres and symmetric outer spheres, so that the device can be made more general; the milling head 3 is rotatably installed on the adapter 2, and the adapter 2 is slidably arranged at one end of the main beam 1, which enables the milling head 3 to feed independently and is convenient for 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 to provide stable power output through the motor 5.

[0020] In this embodiment, at least one arc groove 7 is provided on the turntable plate 4, and at least one bolt 8 is provided on the main beam 1. The bolt 8 penetrates from the arc 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 groove 7 is to limit the rotation range of the main beam 1 and provide precise position control for it; when the main beam 1 rotates, the bolt 8 can fix the main beam 1, thereby avoiding unnecessary shaking or deviation of the main beam 1 during the machining process and improving the accuracy and precision of the machining.

[0021] In this embodiment, at least one positioning hole 9 is provided on each of the turntable plate 4 and the main beam 1, and a positioning pin 10 is provided corresponding to the positioning hole 9. The positioning pin 10 linearly penetrates into the positioning holes 9 on the turntable plate 4 and the main beam 1. The positioning hole 9 is mainly used for grinding the symmetric outer sphere, playing a role in determining a straight line and improving the positioning accuracy. When grinding the asymmetric outer sphere, since the positioning holes 9 are misaligned, it is not necessary to function.

[0022] 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 to feed, facilitating alignment. It should be noted here that the entire device is fixed on the workbench of the numerical control machine tool, and the device itself can realize the movement of the X, Y, and Z axes through the workbench. Alignment is achieved by visually observing the sparks when the grinding wheel and the workpiece 19 rub against each other. Therefore, setting a separate threaded feed mechanism 11 is more convenient for operation. Based on this, as a preferred implementation method, the threaded feed mechanism 11 is mainly powered by a handwheel. A handwheel is a manually controllable rotating tool, and the rotation direction and speed are controlled through the handwheel. This method can improve the operation comfort and accuracy of the operator, thereby ensuring the grinding accuracy.

[0023] In this embodiment, a shaft seat 12 is provided on the adapter 2, the milling head 3 is rotatably connected to the shaft seat 12, a connecting plate 13 is provided on the side of the shaft seat 12, a rotating shaft 14 is provided on the adapter 2, and 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. Two internal hexagonal screws 16 are also provided on the connecting plate 13 on both sides of the rotating shaft 14. After the internal hexagonal screws 16 penetrate the connecting plate 13, they are screwed. By tightening and loosening the two internal hexagonal screws 16, the inclination of the bowl-shaped grinding wheel in the vertical direction can be adjusted.

[0024] In this embodiment, a bowl-shaped grinding wheel 17 or a circular flat grinding wheel 18 is installed on the milling head 3. When grinding the asymmetric outer sphere and the symmetric outer sphere, the bowl-shaped grinding wheel 17 is installed on the milling head 3, and when grinding the inner sphere, it is replaced with the circular flat grinding wheel 18.

[0025] The applicable large-size machining method for the spherical surface structure of the tilting pad journal bearing in this embodiment includes the following steps: Step 1: Fix the turntable plate 4 on the workbench of the CNC lathe; Step 2: When grinding the symmetric outer sphere, use the cylindrical pin 15 to tighten the positioning pins 10 of the main beam 1 and the turntable plate 4 to play a role in determining a straight line, and then lock it with the bolt 8; Step 3: Control the milling head 3 to contact the workpiece 19 and find the correct position by observing the sparks; Step 4: Control the adapter 2 to linearly feed through the threaded feed mechanism 11 for grinding.

[0026] Specifically, in Step 2, when grinding the asymmetrical outer ball, the positioning pin 10 is not used, the turntable plate 4 is fixed, the main beam 1 rotates, the required angle is adjusted, and then it is locked with the bolt 8.

[0027] Specifically, in Step 2, when grinding the asymmetrical outer ball and the symmetrical outer ball, a bowl-shaped grinding wheel 17 is installed on the milling head 3, and when grinding the inner ball, it is replaced with a circular flat grinding wheel 18.

[0028] Specifically, in Step 3, 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 socket head cap screws 16 to adjust the inclination of the bowl-shaped grinding wheel in the vertical direction until the sparks are uniform.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Applicable to large-size tilting pad radial bearing grinding spherical surface structure processing device, characterized by: The invention comprises a main beam (1), an adapter (2), a milling head (3), a turntable plate (4), a motor (5) and a belt (6), wherein the main beam (1) is adjustably mounted on the turntable plate (4), the milling head (3) is rotatably mounted on the adapter (2), the adapter (2) is slidably arranged at one end of the main beam (1), 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).

2. The device for machining the spherical surface structure of a large-sized tilting pad radial bearing according to claim 1 is characterized in that: At least one arc-shaped groove (7) is provided on the turntable plate (4), and at least one bolt (8) is provided on the main beam (1). The bolt (8) is inserted from the arc-shaped groove (7) on the turntable plate (4) into the main beam (1) and is threadedly connected to the main beam (1).

3. The device for machining the spherical surface structure of a large-sized tilting pad radial bearing according to claim 2 is characterized in that: At least one positioning hole (9) is respectively provided on the turntable plate (4) and the main beam (1), and a positioning pin (10) is provided corresponding to the positioning hole (9), and the positioning pin (10) is linearly inserted into the positioning holes (9) on the turntable plate (4) and the main beam (1).

4. The device for machining the spherical surface structure of a large-sized tilting pad radial bearing according to claim 3 is characterized in that: The adapter (2) is provided with a shaft seat (12), the milling head (3) is rotatably connected to the shaft seat (12), a seesaw (13) is provided on the side of the shaft seat (12), a rotating shaft (14) is provided on the adapter (2), a cylindrical pin (15) is provided between the seesaw (13) and the rotating shaft (14) to fix the seesaw (13) and the rotating shaft (14), and the seesaw (13) is also provided with two hexagon socket screws (16) arranged on both sides of the rotating shaft (14), and the hexagon socket screws (16) are inserted into the seesaw (13) and then screwed.

5. The device for machining the spherical surface structure of a large-sized tilting pad radial bearing according to claim 4 is characterized in that: A bowl-shaped grinding wheel (17) or a circular flat grinding wheel (18) is mounted on the milling head (3).

6. A method for machining a large-size tilting pad radial bearing spherical surface structure, characterized in that: The processing is performed by using a large-size tilting pad radial bearing grinding spherical surface structure processing device as claimed in claim 5, and the processing method includes the following steps: Step 1: Fix the turntable plate (4) on the workbench of the CNC lathe; Step 2: When grinding the symmetrical outer ball, use a cylindrical pin (15) to tighten the main beam (1) and the turntable plate (4) positioning pin (10) to play a role in locating the straight line, and then lock it with a bolt (8); Step 3: Control the milling head (3) to contact the workpiece (19), and find the correct position by observing the sparks; Step 4: The thread feed mechanism (11) controls the linear feed of the adapter (2) for grinding.

7. The method for machining a large-size spherical surface structure suitable for tilting pad radial bearings according to claim 6 is characterized in that: In step 2, when grinding the asymmetric 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.

8. The method for machining a large-size spherical surface structure suitable for tilting pad radial bearings according to claim 6 is characterized in that: In step 2, a bowl-shaped grinding wheel (17) is installed on the milling head (3) when grinding the asymmetric outer ball and the symmetric outer ball, and a circular flat grinding wheel (18) is replaced when grinding the inner ball.

9. The method for machining a large-size spherical surface structure suitable for tilting pad radial bearings according to claim 6, characterized in that: In step 3, 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 hexagon socket screws (16), and adjust the vertical inclination of the bowl-shaped grinding wheel until the sparks are uniform.

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