A large thin-walled slewing bearing correction device

Abstract

The application discloses a large thin-wall rotary support bearing correction device and belongs to the technical field of correction devices. The device comprises a workbench, a rotary bearing and a support claw turntable fixing device. The workbench is a disc body, and a T-shaped sliding groove and a limiting sliding groove are arranged on the top surface of the workbench. The T-shaped sliding groove and the limiting sliding groove are arranged in a circular array with the axis of the workbench as the center. A rotary bearing coaxial with the workbench is arranged on the top surface of the workbench. A turntable fixing device is arranged on the outer side of the rotary bearing and is located on the T-shaped sliding groove to fix the rotary bearing on the workbench. A support claw for correcting a workpiece is arranged on the inner side of the rotary bearing and is located on the limiting sliding groove. The bearing to be corrected is placed on the inner bearing of the rotary bearing. The rotary bearing is the same as the bearing type to be corrected. The bearing to be corrected is rotated and deformed by the rotary bearing, and the bearing to be corrected is supported and corrected by the support claw.

Description

Technical Field

[0001] This invention relates to a large thin-walled slewing bearing correction device, belonging to the technical field of correction devices. Background Technology

[0002] The large slewing bearing for artillery has a diameter of about 3 meters and includes a ball bearing and raceway structure. During operation, it mainly relies on the balls and raceways to bear the weight of the upper part of the machine and provide support. At the same time, the balls and raceways move relative to each other to complete the rotation.

[0003] To ensure smooth rotation, prevent jamming, and extend raceway life, raceways undergo surface hardening. This surface hardening often involves medium-frequency induction hardening to increase the surface hardness of the raceway. However, after hardening, stress concentration during heat treatment can lead to significant bearing deformation, making bearing assembly difficult.

[0004] Since the tempering temperature of the raceway surface of such parts after quenching is 150-190℃, if it is corrected after heating, the heating temperature will exceed the tempering temperature, which will cause the hardness of the raceway to decrease. Therefore, cold correction can only be chosen.

[0005] However, these types of slewing bearings are large in size, making cold straightening methods such as spot pressing and hammering unsuitable. Furthermore, the parts are characterized by large size, thin wall thickness, high base strength, and high rigidity. Therefore, using the ordinary single-point support straightening method presents the following challenges: 1. The parts are large in size, with diameters exceeding 3m. During calibration, they must be placed on a special platform. The parts must be able to rotate, and the calibration support position must be adjusted. Multiple points of support are required simultaneously. 2. If the calibration time is insufficient, the parts will spring back after the support force is removed, and the calibration effect cannot be achieved. Therefore, it is necessary to ensure the stability of the clamping and support.

[0006] Therefore, how to solve the deformation problem that occurs after surface strengthening of raceways in large thin-walled slewing bearings has become a difficult problem that needs to be solved in the industry. Summary of the Invention

[0007] To address the shortcomings of the existing technology, this invention provides a large thin-walled slewing bearing correction device that performs quenching and subsequent support correction on parts, meeting the requirements for use, ensuring part quality, and reducing operational difficulty.

[0008] The technical solution adopted by this invention to solve its technical problem is: a large thin-walled rotary bearing correction device, including a worktable, a rotary bearing, and a support claw turntable fixing device. The worktable is a disc with a T-shaped slide groove and a limiting slide groove on its top surface. The T-shaped slide groove and the limiting slide groove are arranged in a ring around the axis of the worktable. A coaxial rotary bearing is provided on its top surface. A turntable fixing device is provided on the outside of the rotary bearing, located on the T-shaped slide groove, to fix it to the worktable. A support claw for correcting the workpiece is provided on the inside of the rotary bearing, located on the limiting slide groove. The bearing to be corrected is placed on the inner bearing of the rotary bearing. The rotary bearing is of the same model as the bearing to be corrected. The bearing to be corrected is rotated and deformed through the rotary bearing. The bearing to be corrected is supported and corrected at multiple points through the support claw.

[0009] The beneficial effects of this invention are: it solves the deformation problem that occurs after the raceway surface of such parts is strengthened, abandons the traditional thermal correction or single-direction support correction method, and adopts a multi-point simultaneous support design scheme. During the correction process, the parts can be rotated and adjusted on the correction device without re-lifting and changing the position. Moreover, this correction device is a universal device that can complete the correction process of similar parts with different diameters, heights and wall thicknesses.

[0010] This large thin-walled slewing bearing correction device not only meets the requirements of product parts and improves product quality, but also has low manufacturing difficulty, high operability, and can meet the production of parts of different sizes and specifications, making it highly versatile. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0012] Figure 1 This is a top view of the present invention.

[0013] Figure 2 This is a cross-sectional view of the present invention.

[0014] Figure 3 This is a top view of the support claw of the present invention.

[0015] Figure 4 This is a side sectional view of the support claw of the present invention.

[0016] Figure 5 This is a partial structural cross-sectional view of the internal bearing during the correction process of the present invention.

[0017] Figure 6 This is a partial structural cross-sectional view of the external bearing during the correction process of this invention.

[0018] Figure 7 This is a top view of the structure of the inner bearing correction baffle of the present invention.

[0019] Figure 8This is a top view of the structure of the outer bearing correction baffle of the present invention.

[0020] Numbering on the map: 1. Workbench, 2. Rotary bearing, 3. Support claw, 4. Support, 5. Pressure plate, 6. Locking bolt, 7. Inner bearing correction baffle, 8. Outer bearing correction baffle, 9. Pad, 31. Fixing plate, 32. Nut slider, 33. Lead screw, 34. Top plate, 71. Inner bearing contact pad, 81. Outer bearing contact pad. Detailed Implementation

[0021] like Figure 1-8 As shown, a large thin-walled rotary bearing correction device includes a worktable 1, a rotary bearing 2, a support claw 3, a support 4, a pressure plate 5, and a locking bolt 6.

[0022] The top surface of the workbench 1 is a disc with a diameter of 5 meters. A coaxial rotary bearing 2 is mounted on its top surface. A standard rotary bearing 2 of the same model is replaced according to the size and type of the bearing to be calibrated. Several T-shaped grooves are arranged at equal angles along the workbench 1's radius. These T-shaped grooves are used to install rotary bearings 2 of different models. A sliding locking bolt 6 is installed within each T-shaped groove. A pressure plate 5 is fitted onto the locking bolt 6 around the rotary bearing 2. A nut with a threaded screw into the locking bolt 6 is mounted on the pressure plate 5. One end of the pressure plate 5 presses against the top surface of the outer bearing of the rotary bearing 2, and the other end presses against the support 4. After tightening the nut, the rotary bearing 2 is fixed to the workbench 1 by the pressure plate. The support 4, pressure plate 5, and locking bolt 6 constitute the turntable fixing device. When replacing the rotary bearing 2, the nut on the locking bolt 6 is loosened, allowing it to slide within the T-shaped groove, thereby fixing the pressure plate 5 at the same position for rotary bearings 2 of different sizes.

[0023] Inside the rotary bearing 2, several support claws 3 are arranged in a ring around the axis of the worktable 1, allowing for multi-point correction and higher efficiency. The worktable 1 is designed to be relatively large; by replacing the rotary bearing 2, large thin-walled rotary support bearings with a maximum diameter of 4.7m can be corrected. For correcting even larger parts, the same structure can be used, employing a larger worktable 1 and matching rotary bearings 2 and support claws 3.

[0024] Each support claw 3 has a pair of limiting grooves parallel to the radius line of the worktable 1 below it. The limiting grooves are a pair of symmetrical T-shaped grooves with the radius line of the worktable 1 as the center line. Each T-shaped groove is equipped with a sliding locking bolt 6. The support claw 3 is engaged with the worktable 1 by screwing the nut of the locking bolt 6 into it. After loosening the nut, the support claw 3 can slide in the limiting groove through the locking bolt 6. The position of each support claw 3 from the center of the worktable 1 is adjusted according to the size of the bearing to be corrected.

[0025] The support claw 3 includes a fixed plate 31, a screw nut slider 32, a lead screw 33, and a top plate 34. The top surface of the fixed plate 31 has four sets of through holes through which locking bolts 6 can pass. Each pair of T-slots of the upper limit slide of the worktable 1 is provided with equally spaced limit slots. The bottom surface of the fixed plate 31 between the through holes is provided with a locking block that can cooperate with the limit slot. After the locking block at the bottom of the fixed plate 31 is inserted into the slot, the nut is screwed into the locking bolt 6 protruding from the top surface of the fixed plate 31 to fix it on the worktable 1. This method can accurately fix the distance between each support claw 3 and the axis of the worktable 1, improving the calibration efficiency and calibration accuracy. The center of the fixed plate 31 has a groove that coincides with the radius line of the worktable 1. A lead screw 33 is provided between the front and rear ends of the groove. A lead screw nut slider 32 is provided in the groove and is sleeved on the lead screw 33. The lead screw nut slider 32 is fixed to the fixed plate 31 by welding. A top plate 34 is inserted into the end of the lead screw 33. When the lead screw 33 is manually rotated, the lead screw 33 drives the top plate 34 to move along the radius line of the worktable 1, so as to realize multi-point support of the bearing to be corrected.

[0026] A stop is provided between the top plate 34 and the bearing to be calibrated. The stop is divided into an inner bearing calibration stop 7 and an outer bearing calibration stop 8. The inner bearing calibration stop 7 has an L-shaped cross section. The horizontal plate of the inner bearing calibration stop 7 supports the inner bearing to be calibrated. The bottom of the inner bearing to be calibrated is placed on the rotating bearing 2 through a pad 9. An inner bearing contact pad 71 is provided between the vertical wall of the inner bearing calibration stop 7 and the inner wall of the inner bearing to be calibrated. One end of the outer bearing calibration stop 8 rests on the top surface of the rotating bearing 2. The outer bearing to be calibrated is placed on the rotating bearing 2 through a pad 9. An outer bearing contact pad 81 is provided between the vertical wall of the outer bearing calibration stop 8 and the inner wall of the outer bearing to be calibrated. The contact pad is made of copper and is installed on the stop by screws. The contact pad has an arc-shaped structure with a radius dimension consistent with the contact surface dimension of the bearing to be calibrated. The only vulnerable parts of this device are the stop and the contact pad that contact the bearing to be calibrated. The other structures are stable, so the service life is very long.

[0027] The bearing to be calibrated is placed on the inner bearing of the rotary bearing 2. The bearing to be calibrated is rotated and deformed through the rotary bearing 2. The bearing to be calibrated is supported and calibrated at multiple points through the support claw 3.

[0028] How to use: 1. Place the pads 9 evenly on the upper surface of the rotating bearing 2, and then place the bearings to be corrected (inner bearing and outer bearing) on ​​the pads 9; 2. Use roundness measuring instruments to inspect the bearings (inner and outer bearings) to be corrected and find the point with the smallest diameter; 3. Rotate the point with the smallest diameter (the point that needs to be supported and corrected) to the position of support jaw 3; 4. Place a correction block and a contact pad between the bearing to be corrected (inner bearing and outer bearing) and the support claw 3 to protect the bearing to be corrected (inner bearing and outer bearing); 5. Rotate the lead screw 33 of the support jaw 3 to apply support force, which is transmitted to the bearing to be corrected (inner bearing, outer bearing) through the top plate 34. Adjust the locking degree according to the degree of deformation. 6. Let it sit for a period of time, usually about ten hours, then release the lead screw 33; 7. Rotate the bearing to be calibrated (inner bearing and outer bearing) for inspection. If it passes, disassemble the parts; if it fails, continue calibration until it passes.

Claims

1. A large thin-walled slewing bearing alignment device, characterized in that: The device includes a worktable (1), a rotary bearing (2), a support claw (3), and a turntable fixing device. The worktable (1) is a disc with a T-shaped groove and a limiting groove on its top surface. The T-shaped groove and the limiting groove are arranged in a ring around the axis of the worktable (1). A coaxial rotary bearing (2) is provided on its top surface. A turntable fixing device is provided on the outside of the rotary bearing (2) and located on the T-shaped groove to fix it to the worktable (1). A support claw (3) is provided on the inside of the rotary bearing (2) and located on the limiting groove to correct the workpiece. The bearing to be calibrated is placed on the inner bearing of the rotary bearing (2). The rotary bearing (2) is the same model as the bearing to be calibrated. The bearing to be calibrated is rotated and deformed through the rotary bearing (2). The bearing to be calibrated is calibrated by multi-point support through the support claw (3). The support claw (3) is located above the upper limit slide groove of the worktable (1). The upper limit slide groove is equipped with a sliding locking bolt (6). The support claw (3) is screwed into the nut of the locking bolt (6) and engaged on the worktable (1). After loosening the nut, The support claw (3) can slide in the limiting groove by locking bolt (6); the support claw (3) includes a fixed plate (31), a screw nut slider (32), a screw rod (33) and a top plate (34). The top surface of the fixed plate (31) has four sets of through holes through which the locking bolt (6) can pass. The limiting groove on the worktable (1) is a pair of symmetrical T-shaped grooves. The T-shaped grooves are provided with equally spaced limiting slots. The bottom surface of the fixed plate (31) between the through holes is provided with a locking block that can cooperate with the limiting slot. The locking block at the bottom of the fixed plate (31) is recessed. After the nut is screwed into the slot, the locking bolt (6) extending from the top surface of the fixing plate (31) is screwed into it to fix it on the workbench (1). The center of the fixing plate (31) is provided with a sliding groove that coincides with the radius line of the workbench (1). A lead screw (33) is provided between the front and rear end faces of the sliding groove. A lead screw nut slider (32) is provided in the sliding groove and is sleeved on the lead screw (33). The lead screw nut slider (32) is fixed on the fixing plate (31) by welding. A top plate (34) is inserted into the end of the lead screw (33). A stop is provided between the top plate (34) and the bearing to be corrected.

2. The large thin-walled slewing bearing alignment device according to claim 1, characterized in that: The turntable fixing device includes a support (4), a pressure plate (5) and a locking bolt (6). The T-shaped groove is equipped with a sliding locking bolt (6). The rotating bearing (2) is equipped with a pressure plate (5) that is fitted onto the locking bolt (6). The pressure plate (5) is equipped with a nut that is threaded into the locking bolt (6). One end of the pressure plate (5) presses on the top surface of the outer bearing of the rotating bearing (2), and the other end presses on the support (4). After tightening the nut, the rotating bearing (2) is fixed on the worktable (1) by the pressure plate. Select a rotating bearing (2) of the same model according to the size of the bearing to be corrected. Move the turntable fixing device in the T-shaped groove by the locking bolt (6) to re-fix the rotating bearing (2).

3. The large thin-walled slewing bearing alignment device according to claim 1, characterized in that: The baffle is divided into an inner bearing correction baffle (7) and an outer bearing correction baffle (8). The cross section of the inner bearing correction baffle (7) is L-shaped. The horizontal plate of the inner bearing correction baffle (7) supports the inner bearing to be corrected. The bottom of the inner bearing to be corrected is placed on the rotating bearing (2) through a pad (9). An inner bearing contact pad (71) is provided between the vertical wall of the inner bearing correction baffle (7) and the inner wall of the inner bearing to be corrected. One end of the outer bearing correction baffle (8) rests on the top surface of the rotating bearing (2). The outer bearing to be corrected is placed on the rotating bearing (2) through a pad (9). An outer bearing contact pad (81) is provided between the vertical wall of the outer bearing correction baffle (8) and the inner wall of the outer bearing to be corrected.

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