Turntable

Abstract

The present invention relates to a turntable, wherein a through hole is provided at the center of the rotating table surface of the turntable as a seat hole, and a base is connected to the rotating table surface through a main shaft and a bearing group arranged in the seat hole, and the main shaft is assembled in the center hole of the base, and a secondary plane thrust bearing is arranged on the base outside the main shaft, and one end face of the end faces at both ends of the rotating table surface is a working plane, and the other end face is supported by the secondary plane thrust bearing, and a first outer cylindrical step is also arranged between the end faces at both ends of the rotating table surface, and a main support body is arranged on the base at the periphery of the secondary plane thrust bearing, and a main plane thrust bearing is assembled between the main support body and the first outer cylindrical step, and three or more deceleration grooves arranged in a central symmetrical manner are opened on the large end ring surface of the first outer cylindrical step. The double slewing support system of the turntable has a strong load capacity, a simple structure, and is easy to manufacture, process, transport and install, and is particularly suitable for application under large diameter and heavy load conditions.

Description

Technical Field

[0001] The invention relates to the technical field of turntables, and in particular to a turntable suitable for use under heavy load conditions. Background Art

[0002] At present, some large parts of power generation equipment are mostly adjusted by lifting equipment during assembly and maintenance. This method has certain safety risks. At the same time, the product parts need to be loosened and tightened before and after each adjustment of the installation posture, so the efficiency is relatively low. For some scenarios that require automated assembly or automated quality inspection by manipulators after intelligent upgrades, it is difficult to achieve precise positioning by adjusting the installation posture of parts by lifting equipment. This application scenario is suitable for the use of servo turntable devices.

[0003] At present, turntables are widely used in the industrial field, but there are some defects and problems. For example, in the invention patent with application number 201811224769.6 "A test turntable", heavy parts have large inertia and overturning moments during rotation. The turntable is supported by a single cylindrical roller bearing, which has insufficient load-bearing capacity and the risk of overturning, and cannot adapt to parts of different sizes. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a turntable suitable for heavy-load applications, the carrying capacity of which can reach more than tens of tons.

[0005] The technical scheme adopted by the present invention is: a turntable, comprising a base and a rotating table supported on the base, the rotating table connected to a rotary drive system, the body of the rotating table is a rotating body, the center of which is provided with a through hole as a seat hole, the base is connected to the rotating table through a spindle and a bearing group arranged in the seat hole, the spindle is assembled in the center hole of the base, a secondary plane thrust bearing is arranged on the base outside the spindle, one end face of the end faces at both ends of the rotating table is a working plane, and the other end face is supported by the secondary plane thrust bearing, and a first outer circle step is also arranged between the end faces at both ends of the rotating table, a main support body is arranged on the base at the periphery of the secondary plane thrust bearing, and a main plane thrust bearing is assembled between the main support body and the first outer circle step. The outer and inner double rotary supports composed of the main and secondary plane thrust bearings, and the outer ring support height is higher than the inner ring support height, reduce the center of gravity of the rotating table, have better stability, can be used for large-diameter heavy workpieces, significantly enhance the load capacity, and reduce the rotation resistance of the turntable.

[0006] The bearing group includes an axial preload bearing, a radial support bearing 1 and a radial support bearing 2. The radial support bearing 2 is arranged between the shoulder of the main shaft and the step of the seat hole, and the radial support bearing 1 is arranged between the step and the axial preload bearing. The axial preload bearing is fixed on the main shaft through the bearing end cover. Since the rotating table is supported by the secondary and main plane thrust bearings arranged on the inner and outer rings, and the position of the secondary plane thrust bearing is lower than that of the main plane thrust bearing, the main shaft needs to bear a large radial load. Therefore, two radial support bearings are designed to be arranged on both sides of the step of the seat hole respectively to reduce the overturning moment during the rotation of the turntable, so as to improve the radial load bearing capacity of the turntable. The axial load caused by the rotation is borne by the axial preload bearing. The diameter of the turntable with the above structure can be about 10 meters, which can be used for large workpieces.

[0007] The main support body is located inside the base, and the main plane thrust bearing will also be located inside the base, so that the base has the protective function of preventing dust and preventing foreign objects from getting stuck in the bearing. According to the above-mentioned force analysis, the axial preload bearing should be selected as an angular contact bearing, and the radial support bearing 1 and radial support bearing 2 are both radial thrust bearings.

[0008] A cover plate is provided on the seat hole of the rotating table to prevent foreign matter from falling into the seat hole. The upper surface of the cover plate is flush with the working plane to form a flat working table surface, which facilitates the movement of the workpiece on the table surface.

[0009] A second outer circular step is also provided between the end surfaces at both ends of the rotating table, the diameter of the second outer circular step is smaller than the diameter of the first outer circular step, a large gear ring is fixedly connected to the second outer circular step, the large gear ring is meshed with two small gears, and the two small gears are connected to the same servo motor through the main shaft of the reducer. That is, the driving system of the turntable adopts a double gear transmission, which can further improve the transmission efficiency and reduce the wear of the gears.

[0010] The working plane is provided with more than three trapezoidal grooves arranged in a central symmetric manner, each of which is opened along the radial direction of the rotating table, and a part support seat that can slide and fix in the trapezoidal groove is installed in each trapezoidal groove. During the rotation process, if the center of gravity of the workpiece deviates from the axis of the turntable, the centrifugal force during the rotation process will cause a large eccentric load. Since the shapes of the workpieces vary greatly, in order to avoid eccentric loads as much as possible, it is necessary to use a fixing device to fix the workpiece on the table for operation. In order to facilitate this operation, multiple trapezoidal grooves are designed to adjust the fixed position of the part support seat in different directions.

[0011] Under heavy load conditions, the inertia is large, and smooth and rapid deceleration is a requirement for the performance of the turntable. To this end, three or more deceleration grooves arranged in a central symmetrical manner are opened on the large end ring surface of the first outer cylindrical step, and the deceleration device is assembled and connected to the deceleration groove. The deceleration device includes a hydraulic cylinder, a brake piston, a piston shaft and a brake seat connected in sequence. The end face of the brake seat and the deceleration groove are separated or contacted due to the expansion and contraction of the brake piston. The end face of the brake seat is perpendicular to the center line of the brake piston, and the center line of the brake piston is parallel to the axis of the seat hole. The deceleration device is arranged under the table. When the brake piston contracts, the end face of the brake seat contacts the deceleration groove. Under the action of the gravity of the workpiece and the rotating table, a large friction force is generated on the end face of the brake seat, so it can decelerate smoothly and quickly, which is also beneficial to improve the positioning accuracy of the turntable.

[0012] In order to facilitate the control of each deceleration device, the hydraulic cylinder of each deceleration device is equipped with an electromagnetic reversing valve, and each electromagnetic reversing valve is controlled by the same PLC.

[0013] In order to avoid unbalanced loading as much as possible, the rotating table needs to be leveled. Therefore, a circle of adjustment shims arranged around the center hole of the base is arranged under the base for adjustment.

[0014] In order to improve the load-bearing capacity, the rolling elements of the main plane thrust bearing and the secondary plane thrust bearing are composed of at least two rows of rollers arranged side by side.

[0015] The beneficial effects of the present invention are as follows: the support system of the turntable adopts double slewing supports of primary and secondary plane thrust bearings, which can be used for large-diameter heavy workpieces, the load capacity is significantly enhanced, and the slewing resistance of the turntable is reduced; the double-gear transmission mechanism can improve the transmission efficiency, eliminate the transmission clearance, and extend the gear life; the bearing group can withstand the axial and radial loads during the rotation process, reduce the overturning moment during the rotation of the turntable, and eliminate the risk of the turntable overturning; multiple groups of reduction devices can improve the deceleration capacity and positioning accuracy of the system, have a simple structure, are easy to manufacture, process, transport and install, and are particularly suitable for application under large-size and heavy-load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the turntable of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the turntable of the present invention.

[0018] Figure 3 It is the front view of the turntable of the present invention.

[0019] Markings in the figure are: 1-part support seat, 2-main plane thrust bearing, 3-rotating table, 4-large gear ring, 5-cover plate, 6-bearing end cover, 7-axial preload bearing, 8-radial support bearing one, 9-main shaft, 10-radial support bearing two, 11-secondary plane thrust bearing, 12-first outer cylindrical step, 13-main support body, 14-base, 15-brake seat, 16-piston shaft, 17-brake piston, 18-hydraulic cylinder, 19-adjusting shim, 20-reducer, 21-pinion, 22-second outer cylindrical step, 23-servo motor, 24-reducer main shaft, 25-reduction groove, 26-lifting ring. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Example:

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, the turntable of the present invention is mainly composed of a slewing support system, a driving system, a leveling system, and a deceleration locking system. The slewing support system includes a base 14 and a rotating table 3 supported on the base 14. The body of the rotating table 3 is a rotating body, and a through hole is arranged in the center as a seat hole. A cover plate 5 is arranged at the upper end of the seat hole. The base 14 is connected to the rotating table 3 through a spindle 9 and a bearing group arranged in the seat hole. The spindle 9 is assembled in the center hole of the base 14. A secondary plane thrust bearing 11 is arranged on the base 14 outside the spindle 9. Among the end faces at both ends of the rotating table 3, the end face of one end is a working plane. The upper surface of the cover plate 5 is flush with the working plane, and the working plane is centered. There are more than three trapezoidal grooves symmetrically arranged on the center, and the trapezoidal grooves are opened along the radial direction of the rotating table 3. A part support seat 1 that can be slid and fixed in the trapezoidal groove is installed in each trapezoidal groove. The position of the part support seat 1 can be adjusted through the trapezoidal groove of the table. The end face of the other end is supported by the secondary plane thrust bearing 11. A first outer circle step 12 is also provided between the end faces at both ends of the rotating table 3. A main support body 13 is arranged on the base 14 at the periphery of the secondary plane thrust bearing 11, and a main plane thrust bearing 2 is assembled between the main support body 13 and the first outer circle step 12.

[0023] The main plane thrust bearing 2 is responsible for the load-bearing and rotation of the outer ring of the rotating table 3, and the secondary plane thrust bearing 11 is responsible for the load-bearing and rotation of the inner ring of the rotating table 3. Both the main plane thrust bearing 2 and the secondary plane thrust bearing 11 use overweight plane bearings, and both use three or more rows of ball rollers arranged side by side. This method increases the load-bearing area of ​​the thrust bearing, so that the bearing has a greater load-bearing capacity and the ability to adapt to heavy equipment of different sizes. This embodiment adopts a double rotary thrust bearing arrangement, which on the one hand increases the load-bearing capacity of the entire turntable, and on the other hand reduces the rotation resistance of the entire turntable. Figure 3 As shown, there is a gap between the rotating table 3 and the upper end surface of the base 1. During the rotation of the rotating table 3, due to the deadweight of the rotating table 3 and the load it carries, under the action of friction, the main plane thrust bearing 2 and the secondary plane thrust bearing 11 are responsible for the bearing of the outer ring and the inner ring of the rotating table 3 respectively.

[0024] The bearing group includes an axial preload bearing 7, a radial support bearing 1 8 and a radial support bearing 2 10. The radial support bearing 2 10 is arranged between the shoulder of the main shaft 9 and the step of the seat hole. The radial support bearing 1 8 is arranged between the step and the axial preload bearing 7. The axial preload bearing 7 is fixed on the main shaft 9 through the bearing end cover 6. The bearing is pressed and sealed by the bearing end cover 6. The main support body 13 is located inside the base 14. The axial preload bearing 7 is an angular contact bearing. The radial support bearing 1 8 and the radial support bearing 2 10 are both radial thrust bearings. The bearing group is mainly responsible for bearing the radial and axial loads formed during the rotation of the turntable. The radial support bearing can reduce the overturning moment during the rotation of the turntable and eliminate the risk of the turntable overturning. The rotating table 3 adopts an integrated casting method, which not only has the function of bearing the turntable, but also takes into account the functions of the gear bracket and the bearing seat. On the one hand, it reduces the center of gravity of the entire turntable, and on the other hand, it simplifies the connection method of the entire device.

[0025] The rotary drive system includes a servo motor 23, a reducer 20, two parallel arranged pinions 21, and a large ring gear 4. The servo motor 23 is fixed on the outside of the base 14. The reducer 20 is arranged on a boss inside the base 1 between the main support body 13 and the rotating table 3. The servo motor 23 is connected to the reducer 20 through a transmission shaft. The reducer 20 has a dual output shaft, namely a reducer main shaft 24. The pinion 21 is installed on the reducer main shaft 24. A second outer cylindrical step 22 is provided between the end faces at both ends of the rotating table 3. The diameter of the second outer cylindrical step 22 is smaller than the diameter of the first outer cylindrical step 12. The large ring gear 4 is fixedly connected to the second outer cylindrical step 22. An outer cylindrical step is also provided between the second outer cylindrical step 22 and the first outer cylindrical step 12 for meshing and giving way of the large ring gear 4. The large ring gear 4 meshes with the two pinions 21.

[0026] The servo motor 23 transmits the torque to the reducer 20 through the transmission shaft. Through the speed ratio conversion, the amplified torque is transmitted to the pinion 21 through the reducer main shaft 24. The pinion 21 transmits the torque to the large ring gear 4 through the gear matching with the large ring gear 4. The large ring gear 4 synchronously drives the rotating table 3 to rotate during the rotation process, thereby transmitting the power of the servo motor 23 to the turntable and driving the turntable to rotate. Under the instructions of the servo motor 23, the transmission device, and the control system, the servo turntable completes the accurate rotation and positioning of the load components on the turntable to achieve the installation or quality inspection of the load components.

[0027] The base 14 is supported by a circle of adjustment washers 19 arranged around the center hole thereof. The circle of adjustment washers 19 is in the shape of wedge-shaped leveling blocks and is evenly arranged at the bottom of the base 1 to form a leveling system.

[0028] The deceleration system is evenly arranged around the base 1, including four deceleration grooves 26 opened on the large end ring surface of the first outer circular step 12 and arranged in a central symmetrical manner. Four sets of deceleration devices are assembled and connected with the deceleration grooves 25 one by one to form a deceleration locking mechanism. Each set of deceleration devices includes a hydraulic cylinder 18, a brake piston 17, a piston shaft 16 and a brake seat 15 connected in sequence. The end face of the brake seat 15 and the deceleration groove 25 are separated or contacted due to the expansion and contraction of the brake piston 17. The center line of the brake piston 17 is parallel to the axis of the seat hole. The hydraulic cylinder 18 of each deceleration device is equipped with an electromagnetic reversing valve, and each electromagnetic reversing valve is controlled by the same PLC. During the deceleration process, the brake piston 17 of the deceleration system is tightened, and the torque is transmitted to the brake seat 15 through the piston shaft 16. The brake seat 15 squeezes the deceleration groove 25 of the rotating table 3. The brake seat 15 and the rotating table 3 reduce the rotation speed of the turntable and lock the current position of the table through the action of friction. When the turntable needs to run again, the brake piston 17 lifts the brake seat 15, and the brake seat 15 is separated from the deceleration groove 25 of the rotating platform 3. Because the turntable has a large inertia during the operation under heavy load, the four groups of deceleration and locking mechanisms act simultaneously, which can improve the deceleration capacity of the system and also improve the positioning accuracy of the system, but there is no strict synchronization requirement for each group of deceleration and locking mechanisms.

[0029] In the above description of this embodiment, the "upper", "upper end" or "upper surface" indicating the orientation means that when the base 1 is installed on the foundation through the leveling system, the "upper and lower" positional relationship between the remaining components is "upper" in the direction of gravity.

[0030] In addition, hanging rings 26 are arranged around the base 1 to facilitate the adjustment of the position of the shim 19 according to leveling needs and the overall transportation of the turntable.

Claims

1. A turntable, comprising a base (14) and a rotating table (3) supported on the base (14), wherein the rotating table (3) is connected to a rotating drive system, and wherein: The main body of the rotating table (3) is a rotating body, the center of which is provided with a through hole as a seat hole, the base (14) is connected to the rotating table (3) via a main shaft (9) and a bearing assembly arranged in the seat hole, the main shaft (9) is assembled in the center hole of the base (14), and a secondary plane thrust bearing (11) is arranged on the base (14) outside the main shaft (9); The bearing group comprises an axial preload bearing (7), a radial support bearing 1 (8) and a radial support bearing 2 (10); the radial support bearing 2 (10) is arranged between the shaft shoulder of the main shaft (9) and the step of the seat hole; the radial support bearing 1 (8) is arranged between the step and the axial preload bearing (7); the axial preload bearing (7) is fixed to the main shaft (9) through a bearing end cover (6); the axial preload bearing (7) is an angular contact bearing; the radial support bearing 1 (8) and the radial support bearing 2 (10) are both radial thrust bearings; Of the end surfaces at both ends of the rotating table (3), the end surface at one end is a working plane, and the end surface at the other end is supported by the secondary plane thrust bearing (11); a first outer cylindrical step (12) is also provided between the end surfaces at both ends of the rotating table (3); a main support body (13) is arranged on the base (14) at the periphery of the secondary plane thrust bearing (11); the main support body (13) is located inside the base (14); a main plane thrust bearing (2) is mounted between the main support body (13) and the first outer cylindrical step (12); the rolling elements of the main plane thrust bearing (2) and the secondary plane thrust bearing (11) are both composed of at least two rows of rollers arranged side by side; A second outer circular step (22) is also provided between the end surfaces at both ends of the rotating table (3); the diameter of the second outer circular step (22) is smaller than the diameter of the first outer circular step (12); a large gear ring (4) is fixedly connected to the second outer circular step (22); the large gear ring (4) is meshed with two small gears (21); and each small gear (21) is connected to the same servo motor (23) via a reducer main shaft (24).

2. The turntable according to claim 1, characterized in that: A cover plate (5) is provided on the seat hole of the rotating table (3), and the upper surface of the cover plate (5) is flush with the working plane.

3. The turntable according to claim 1, characterized in that: More than three trapezoidal grooves are arranged in a centrally symmetrical manner on the working plane, each trapezoidal groove is opened along the radial direction of the rotating table (3), and a part support seat (1) that can be slidably fixed in the trapezoidal groove is installed in each trapezoidal groove.

4. The turntable according to claim 1, characterized in that: The large end annular surface of the first outer cylindrical step (12) is provided with more than three deceleration grooves (25) arranged in a central symmetrical manner. The deceleration device is assembled and connected to the deceleration grooves (25). The deceleration device comprises a hydraulic cylinder (18), a brake piston (17), a piston shaft (16) and a brake seat (15) which are connected in sequence. The end surface of the brake seat (15) and the deceleration groove (25) are separated or contacted due to the expansion and contraction of the brake piston (17). The end surface of the brake seat (15) is perpendicular to the center line of the brake piston (17), and the center line of the brake piston (17) is parallel to the axis of the seat hole.

5. The turntable according to claim 4, characterized in that: The hydraulic cylinder (18) of each deceleration device is equipped with an electromagnetic reversing valve, and each electromagnetic reversing valve is controlled by the same PLC.

6. The turntable according to claim 1, characterized in that: The base (14) is supported by a circle of adjustment shims (19) arranged around its central hole.

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