WO2022268169A1 - Slewing bearing structure, turntable and operation machine - Google Patents

Abstract

A slewing bearing structure, comprising a shell (1), a rotary shaft assembly (2), radial bearings (3) and axial bearings (4), wherein the rotary shaft assembly (2) is arranged in the shell (1) in the vertical direction of the shell (1); the radial bearings (3) are arranged in the shell (1), and the radial bearings (3) are coaxially sleeved outside a spindle (21) of the rotary shaft assembly (2), and apply a radial first acting force to the spindle (21), such that the rotary shaft assembly (2) and the radial bearing (3) have the same axis; the axial bearings (4) are arranged in the shell (1), and the axial bearings (4) are coaxially sleeved outside the spindle (21) and are axially arranged opposite a thrust disc (22) of the rotary shaft assembly (2); and the axial bearings (4) apply an axial and upward second acting force to the thrust disc (22), such that the rotary shaft assembly (2) is kept in a suspended state in the axial direction. Also disclosed are a turntable and an operation machine. Contact friction between movable and static components of the slewing bearing structure is avoided, and the frictional resistance torque is reduced, such that the power consumption and slewing noise of the slewing bearing structure are reduced, the service life of the slewing bearing structure is prolonged, and the maintenance-free performance of the slewing bearing structure is improved.

Description

Slewing bearing structure, slewing table and working machinery technical field

The present application relates to the technical field of working machinery, and in particular to a slewing bearing structure, a turntable and working machinery.

Background technique

For the working machine that needs to rotate, the working machine is provided with a turntable and a jib, the turntable is arranged on the body of the working machine, and the head end of the jib is connected to the turntable. When the turntable starts to turn, it can drive the end of the boom to reach different working positions.

The slewing ring is an important part of the turntable. The existing slewing bearing usually includes an inner ring, an outer ring and a rolling body. A raceway is formed between the opposite end surfaces of the inner ring and the outer ring, and the rolling body is arranged in the raceway. Here, the rotary drive mechanism applies a circumferential turning moment to the inner ring or the outer ring, and under the rolling support of the rolling elements, relative rotation occurs between the inner ring and the outer ring, thereby realizing the slewing function of the slewing bearing.

However, in actual operation, especially when the working machine is operating under heavy-duty slewing conditions, there is a large contact friction force between the rolling elements and the raceways of the slewing bearing, which leads to inevitable occurrence of friction between the rolling elements and the raceways. Abrasion, deformation or even cracking, and greater noise during rotation. Due to the hard contact between the rolling body and the raceway of the slewing bearing, it is necessary to overcome a large frictional resistance moment during the rotation of the slewing bearing, and it is also necessary to perform regular lubrication and maintenance on the slewing bearing, otherwise, the operating conditions of the slewing bearing will be sharp Deterioration, the service life is seriously affected.

Contents of the invention

The present application provides a slewing bearing structure, a slewing platform and a working machine, which are used to solve the problems of large slewing power consumption, high slewing noise, easy damage and difficult maintenance in the existing slewing bearings.

The application provides a slewing support structure, including: a housing, a rotary shaft assembly, radial bearings and axial bearings; the rotary shaft assembly is arranged in the housing along the vertical direction of the housing; the rotary shaft assembly includes a main shaft and a thrust plate , the thrust disc is coaxially arranged on the main shaft; the radial bearing is arranged in the housing, and the radial bearing is coaxially sleeved outside the main shaft; the radial bearing is used to apply a first force in the radial direction to the main shaft to The rotary shaft assembly and the radial bearing have the same axial center; the axial bearing is arranged in the casing, and the axial bearing is coaxially sleeved outside the main shaft, and is arranged axially opposite to the thrust plate; the axial bearing is used for The thrust plate exerts a second acting force in the axial direction, so that the rotary shaft assembly maintains a suspended state in the axial direction.

A slewing support structure provided according to the present application further includes: a first displacement sensor, a second displacement sensor and a control device; the detection end of the first displacement sensor is used to extend radially toward the side of the main shaft, to Used to detect the radial offset generated by the rotary shaft assembly; the first displacement sensor is connected in communication with the control device, and the control device is connected in communication with the radial bearing; the second displacement sensor The detection end is used to extend toward the thrust plate in the axial direction, so as to detect the axial offset generated by the rotary shaft assembly; the second displacement sensor is connected in communication with the control device, and the control device is connected with the control device The axial bearing is connected in communication.

According to a slewing support structure provided by the present application, at least one of the radial bearing and the axial bearing is an electromagnetic bearing; when the radial bearing is an electromagnetic bearing, the radial bearing uses for applying a first radially outwardly directed force to the spindle.

According to a slewing support structure provided by the present application, when the radial bearing is an electromagnetic bearing, a magnetic conduction ring is formed on the side of the main shaft; the outer surface of the magnetic conduction ring is in contact with the radial bearing The inner surfaces are arranged radially opposite to each other.

According to a slewing support structure provided by the present application, it further includes: a radial protection sleeve; the radial protection sleeve is coaxially sleeved on the main shaft; the radial protection sleeve is connected to the housing A first radial gap is formed between the inner surface of the radial protection bushing and the outer surface of the main shaft; a second radial gap is formed between the inner surface of the radial bearing and the outer surface of the magnetic permeable ring To the gap; the width of the second radial gap is greater than the width of the first radial gap.

According to a slewing bearing structure provided by the present application, there are two radial bearings, and the two radial bearings are respectively arranged at positions close to the upper port and the lower port of the housing; the radial protection There are two shaft sleeves, one of which is the radial protection shaft sleeved on the upper port of the housing, and the other radial protection shaft is sleeved on the lower port of the housing.

According to a slewing support structure provided in the present application, there are two axial bearings; the thrust plate is arranged between the two axial bearings.

According to a slewing support structure provided by the present application, it further includes: an axial protection sleeve; the axial protection sleeve is coaxially sleeved on the outside of the main shaft; the axial protection sleeve and the housing The lower port is connected; the side of the main shaft is formed with a stop step, and a first axial gap is formed between the stop step and the opposite end surface of the axial protection sleeve; the axial bearing and the thrust A second axial gap is formed between the opposite end faces of the disk, and the width of the second axial gap is greater than the width of the first axial gap.

The present application also provides a turntable, including: a turntable, a turntable drive mechanism and the above-mentioned turntable support structure; the upper end of the turnshaft assembly is connected to the turntable; the lower end of the turnshaft assembly is connected to the turntable Slewing drive mechanism connection.

The present application also provides an operating machine, comprising the above-mentioned slewing support structure, or the above-mentioned slewing platform.

The application provides a slewing bearing structure, a slewing table, and an operating machine. By setting a housing, a rotary shaft assembly, a radial bearing, and an axial bearing, the radial bearing sleeve exerts the first force on the main shaft of the rotary shaft assembly in the radial direction. The first force and the second force exerted by the axial bearing on the thrust plate of the rotary shaft assembly in the axial direction, under the combined action of the first force and the second force, the rotary shaft assembly can be suspended in the housing , and it is in a non-contact state with the stator parts of the slewing support structure during slewing, which can not only avoid contact friction between the moving and static parts of the slewing support structure, reduce frictional resistance torque, reduce power consumption and slewing noise of the slewing support structure, The service life of the slewing support structure is improved, and the slewing support structure does not need to use lubricating grease during operation, which improves the maintenance-free performance.

Description of drawings

In order to more clearly illustrate the technical solutions in this application or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present For some embodiments of the application, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the installation structure of the slewing bearing structure provided by the present application on the working machine;

Fig. 2 is a schematic diagram of the installation structure of the radial bearing provided by the application on the rotary shaft assembly;

Fig. 3 is a top view structural schematic diagram of Fig. 1 provided by the present application;

Fig. 4 is a schematic structural view of the rotary shaft assembly provided by the present application.

Explanation of reference signs:

1. Shell; 2. Rotary shaft assembly; 3. Radial bearing; 4. Axial bearing; 5. Radial protection bushing; 6. Axial protection bushing; 7. Frame; 8. Rotary drive mechanism; 9. Swivel seat; 10. Accommodating chamber; 21. Main shaft; 22. Thrust plate; 23. Magnetic ring; 31. Bearing sleeve; 32. Winding coil; 310. Protrusion; 11. First displacement sensor; 12. Second 2. displacement sensor; 13. control device; 81. rotary motor; 82. gear transmission mechanism.

detailed description

In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are part of the embodiments of this application , but not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

A slewing bearing structure, a slewing platform and an operating machine of the present application are described below with reference to FIGS. 1-4 .

As shown in Figures 1 to 4, this embodiment provides a slewing support structure, including a housing 1, a rotary shaft assembly 2, a radial bearing 3 and an axial bearing 4; The vertical direction is set in the housing 1; the rotary shaft assembly 2 includes the main shaft 21 and the thrust disc 22, and the thrust disc 22 is coaxially sleeved on the main shaft 21; the radial bearing 3 is located in the housing 1, and the radial bearing 3 is the same as The shaft is sleeved on the outside of the main shaft 21; the radial bearing 3 is used to apply a first force in the radial direction to the main shaft 21, so that the rotary shaft assembly 2 and the radial bearing 3 have the same axis; the axial bearing 4 Located in the housing 1, the axial bearing 4 is coaxially sleeved on the outside of the main shaft 21, and is arranged axially opposite to the thrust plate 22; the axial bearing 4 is used to apply a second axial force to the thrust plate 22. A force is applied to keep the rotary shaft assembly 2 in a suspended state in the axial direction.

Specifically, in this embodiment, by setting the housing 1, the rotary shaft assembly 2, the radial bearing 3 and the axial bearing 4, based on the first force exerted by the radial bearing 3 on the main shaft 21 of the rotary shaft assembly 2 in the radial direction and the The second force exerted by the axial bearing 4 on the thrust plate 22 of the rotary shaft assembly 2 in the axial direction can make the rotary shaft assembly 2 in the casing 1 under the combined action of the first force and the second force. Suspended state, and in a non-contact state with the stator parts of the slewing support structure during slewing, which can not only avoid contact friction between the moving and static parts of the slewing support structure, reduce frictional resistance torque, and reduce the power consumption and slewing of the slewing support structure. Noise increases the life of the slewing bearing structure, and the slewing bearing structure does not need to use lubricating grease during operation, which improves maintenance-free performance.

It should be pointed out here that the housing 1 shown in this embodiment can be designed as a cylinder, an upper port is formed at the upper end of the housing 1, and a lower port is formed at the lower end of the housing 1, and the housing 1 is connected with the The radial bearing 3 and the axial bearing 4 are arranged coaxially. Among them, the shape of the housing 1 is preferably cylindrical.

At the same time, the radial bearing 3 and the axial bearing 4 shown in this embodiment can be either electromagnetic bearings or pneumatic bushings, and one of the radial bearing 3 and the axial bearing 4 can also be set as For the electromagnetic bearing, the other one of the radial bearing 3 and the axial bearing 4 is used as an aerodynamic bushing, which is not specifically limited here.

Wherein, in the case that the radial bearing 3 and the axial bearing 4 are electromagnetic bearings, the radial bearing 3 is used to apply a first force directed outward in the radial direction to the main shaft 21 in the case of electrification, and the axial bearing 4 is the same as It is used to apply a second acting force in the axial direction to the thrust plate 22 when the power is turned on. Here, both the first acting force and the second acting force are electromagnetic attraction forces.

Correspondingly, in the case where the radial bearing 3 and the axial bearing 4 are pneumatic bushings, the radial bearing 3 is used to apply a first radially inwardly directed force to the main shaft 21 under the condition of ventilation, and the axial bearing 4 is the same as in the case of ventilation, and is used to apply the second axial force to the thrust plate 22. Here, both the first acting force and the second acting force are aerodynamic thrusts.

Due to the simple structure and convenient control of the electromagnetic bearing, the radial bearing 3 and the axial bearing 4 shown in this embodiment are preferably electromagnetic bearings. The following schemes of this embodiment all take the electromagnetic bearing as an example to describe the slewing support structure in detail.

In the case where the radial bearing 3 is an electromagnetic bearing, since the radial bearing 3 is sleeved on the outside of the main shaft 21, the first acting force exerted by the radial bearing 3 on the main shaft 21 includes a plurality of first acting forces along the The circumferential direction of the main shaft 21 is distributed in a circle, and each first acting force is distributed along the radial direction of the main shaft 21 . As shown in Figure 2, the radial bearing 3 shown in this embodiment includes a bearing sleeve 31 and a winding coil 32. A plurality of protrusions 310 are arranged on the inner surface of the bearing sleeve 31 along the circumferential direction, and each protrusion 310 is provided with Winding coil 32 . Since the rotary shaft assembly 2 is usually a steel shaft, the rotary shaft assembly 2 will be magnetized under the action of the magnetic field generated by the radial bearing 3, so that the first force is specifically distributed from the main shaft 21 to the radial bearing 3 in the radial direction electromagnetic attraction.

Therefore, when the slewing support structure shown in this embodiment is applied to a working machine, by adjusting the current of each winding coil on the radial bearing 3, the magnitude of each first acting force distributed along the circumferential direction can be adjusted respectively. control to balance the overturning moment generated by the turntable, boom and heavy objects on the working machine, so as to ensure that the rotary shaft assembly 2 and the housing 1 are coaxially distributed.

Since the structure of the axial bearing 4 is similar to that of the radial bearing 3 , the specific structure of the axial bearing 4 will not be repeated here. Apparently, the axial bearing 4 shown in this embodiment is used to balance the gravity generated by the slewing table, arm frame and heavy objects on the working machine. Thus, under the comprehensive action of the first force generated by the radial bearing 3 on the rotary shaft assembly 2 and the second force generated by the axial bearing 4 on the rotary shaft assembly 2, the rotary shaft assembly 2 can be placed in the housing 1 The inner part is in a suspended state, and is in a non-contact state with the stator part of the slewing support structure when it is turning.

It should be pointed out here that, in order to further ensure the stability of the suspension of the rotary shaft assembly 2 in the housing 1 , the rotary support structure shown in this embodiment can be provided with multiple radial bearings 3 and axial bearings 4 at the same time.

Further, in order to accurately control the levitation state of the rotary shaft assembly 2, this embodiment is also provided with a first displacement sensor 11, a second displacement sensor 12 and a control device 13; the detection end of the first displacement sensor 11 is used for Extending radially to the side of the main shaft 21, it is used to detect the radial offset generated by the rotary shaft assembly 2; Electrically connected; the detection end of the second displacement sensor 12 is used to extend axially to the thrust plate 22 for detecting the axial offset generated by the rotary shaft assembly 2; the second displacement sensor 12 is connected to the control device 13 in communication , the control device 13 is electrically connected to each winding coil on the axial bearing 4 .

Specifically, in this embodiment, when the radial displacement of the rotary shaft assembly 2 is detected by the first displacement sensor 11, the radial offset generated by the rotary shaft assembly 2 can be fed back to the control device 13 in real time, and the control device 13 can pass By analyzing and processing the information fed back by the first displacement sensor 11, the power supply signal (voltage or current) of each winding coil in the radial bearing 3 can be adjusted, thereby changing the magnetic field distribution in the radial bearing 3, and then changing the spindle 21, to balance the overturning moment that the rotary shaft assembly 2 is subjected to when it turns.

Correspondingly, in this embodiment, when the axial displacement of the rotary shaft assembly 2 is detected by the second displacement sensor 12, the axial offset generated by the rotary shaft assembly 2 can be fed back to the control device 13 in real time, and the control device 13 can pass By analyzing and processing the information fed back by the second displacement sensor 12, the power supply signal (voltage or current) of each winding coil in the axial bearing 4 can be adjusted, thereby changing the magnetic field distribution in the axial bearing 4, and then changing the thrust The magnitude and direction of the force on the disk 22 is to balance the gravity generated by the turntable, the arm frame and the heavy objects when the rotary shaft assembly 2 is rotating.

It should be pointed out that, in order to realize the precise control of the suspension state of the rotary shaft assembly 2, the first displacement sensor 11 and the second displacement sensor 12 shown in this embodiment are equipped with a plurality of first displacement sensors. 11 and a plurality of second displacement sensors 12 are distributed in a circle relative to the rotary shaft assembly 2 .

At the same time, the control device 13 shown in this embodiment is provided with a control module, which may be an integrated circuit chip and has signal processing capabilities. The above-mentioned control module can be a general-purpose processor, including a central processing unit (Central Processing Unit, referred to as CPU), a network processor (Network Processor, referred to as NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit ( ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The control module can also be any conventional processor, etc., which is not specifically limited here.

In addition, when the radial bearing 3 and the axial bearing 4 are pneumatic bushings, the control device 13 shown in this embodiment can control the radial The ventilation state of the bearing 3 and the axial bearing 4 is controlled, so that the rotary shaft assembly 2 maintains a suspended state in the axial direction in the housing 1 .

As shown in Figures 1 and 4, when the radial bearing 3 is an electromagnetic bearing, in order to facilitate the radial force applied by the radial bearing 3 to the main shaft 21 in the radial direction, the side surface of the main shaft 21 shown in this embodiment is formed There is a magnetic conduction ring 23 ; the outer surface of the magnetic conduction ring 23 is radially opposite to the inner surface of the radial bearing 3 . Wherein, the magnetically permeable ring 23 shown in this embodiment can be made of a material with good magnetic permeability, preferably an iron ring or a steel ring.

Further, this embodiment is also provided with a radial protection sleeve 5; the radial protection sleeve 5 is coaxially sleeved on the main shaft 21; the radial protection sleeve 5 is connected to the housing 1; the radial protection sleeve 5 A first radial gap is formed between the inner surface and the outer surface of the main shaft 21; a second radial gap is formed between the inner surface of the radial bearing 3 and the outer surface of the magnetic permeable ring 23; the width of the second radial gap is greater than that of the first The width of a radial gap.

Specifically, due to the effect of the overturning moment, the rotary shaft assembly 2 shown in this embodiment will inevitably produce a radial offset during the rotation process. This embodiment provides a second radial gap, which means that the rotary shaft The radial offset of the assembly 2 provides an activity margin, and can also provide better protection for the radial bearing 3 .

At the same time, in this embodiment, by setting the width of the second radial gap to be greater than the width of the first radial gap, the radial direction of the rotary shaft assembly 2 can be limited by the radial protection sleeve 5 when the rotary support structure is not working. offset.

As shown in Figure 1, in order to better control the radial offset of the rotary shaft assembly 2 and ensure the stability of the overall structure of the slewing support structure, two radial bearings 3 shown in this embodiment are provided. The radial bearing 3 is located in the housing 1 and is located close to the upper port and the lower port of the housing 1; two radial protection sleeves 5 are provided, and one radial protection sleeve 5 is located at the bottom of the housing 1. On the upper port, another radial protection sleeve 5 is arranged on the lower port of the housing 1 .

As shown in FIG. 1 , in order to better control the axial offset of the rotary shaft assembly 2 , there are two axial bearings 4 shown in this embodiment; the thrust disc 22 is arranged between the two axial bearings 4 .

Specifically, in actual work, this embodiment can apply a vertical upward electromagnetic attraction to the thrust plate 22 through the axial bearing 4 arranged on the upper side of the thrust plate 22, and through the axial bearing 4 arranged on the lower side of the thrust plate 22 The bearing 4 applies a vertically downward electromagnetic attraction force to the thrust plate 22, and the thrust plate 22 can be under the action of the electromagnetic attraction force applied by the two axial bearings 4, the gravity of the thrust plate 22 and the external load force on the thrust plate 22. reach a state of equilibrium. Wherein, the vector sum of the multiple electromagnetic attraction forces shown in this embodiment forms the second acting force shown in the above embodiments.

As shown in Figure 1, this embodiment is also provided with an axial protection sleeve 6; the axial protection sleeve 6 is coaxially sleeved on the main shaft 21; the axial protection sleeve 6 is connected to the lower port of the housing 1; the main shaft A stop step is formed on the side of 21, a first axial gap is formed between the stop step and the opposite end surface of the axial protection sleeve 6; a second axial gap is formed between the axial bearing 4 and the opposite end surface of the thrust disc 22 , the width of the second axial gap is greater than the width of the first axial gap.

Specifically, due to the action of external load force, the rotary shaft assembly 2 shown in this embodiment will inevitably produce an axial offset during the rotation process. This embodiment provides a second axial clearance, which is for the The axial offset of the rotary shaft assembly 2 provides an activity margin and better protection for the axial bearing 4 .

At the same time, in this embodiment, by setting the width of the second axial gap to be greater than the width of the first axial gap, the axial direction of the rotary shaft assembly 2 can be limited by the axial protection sleeve 6 when the rotary support structure is not working. offset.

In addition, in this embodiment, by connecting the axial protection sleeve 6 to the lower port of the housing 1 , the axial protection sleeve 6 shown in this embodiment can also function as an adapter seat. In practical applications, in this embodiment, the diameter of the axial protection sleeve 6 can be set to be larger than that of the casing 1, and the axial protection sleeve 6 can be connected with the working machine.

As shown in Figure 1, the upper end of the rotary shaft assembly 2 shown in this embodiment protrudes from the upper port of the casing 1, and is used to connect with the rotary seat 9; the casing 1 is used to be arranged on the working machine; the rotary shaft assembly The lower end of 2 protrudes from the lower port of housing 1 and is used to connect with rotary drive mechanism 8 .

Specifically, in this embodiment, the upper end of the rotary shaft assembly 2 can be coaxially connected with the transition plate, and the transition plate can be connected with the rotary seat 9 . In this embodiment, the lower port of the casing 1 can be connected with the axial protection bushing 6, and the axial protection bushing 6 can be connected with the frame 7 of the working machine.

At the same time, in this embodiment, an accommodating chamber 10 can also be provided on the vehicle frame 7 of the working machine, and the slewing drive mechanism 8 can be arranged in the accommodating chamber 10 . Wherein, the rotary drive mechanism 8 shown in this embodiment includes a rotary motor 81 and a gear transmission mechanism 82, the gear transmission mechanism 82 includes a first gear and a second gear that mesh, and the output shaft of the rotary motor 81 is coaxial with the first gear. Connected, the second gear is coaxially connected with the lower end of the rotary shaft assembly 2.

Preferably, this embodiment also provides a turntable, including: a turntable 9, a turntable drive mechanism 8 and the above-mentioned turntable support structure; the upper end of the turnshaft assembly 2 is connected to the turntable 9; the lower end of the turnshaft assembly 2 Connect with the rotary drive mechanism 8.

Specifically, since the turntable shown in this embodiment includes the slewing support structure shown in the above-mentioned embodiment, the specific structure of the slewing support structure can refer to the above-mentioned embodiment, and the turntable shown in this embodiment adopts all the above-mentioned technologies Therefore, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be described here one by one.

Preferably, this embodiment also provides a work machine, including the above-mentioned slewing support structure, or the above-mentioned slewing table.

Specifically, the working machine shown in this embodiment further includes a boom, and one end of the boom is connected to the turntable. The work machines shown in this embodiment may be cranes, pump trucks, fire trucks, etc. known in the art, and are not specifically limited here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims (10)

A slewing bearing structure, characterized in that it comprises: shell (1); A rotary shaft assembly (2), the rotary shaft assembly (2) is arranged in the housing (1) along the vertical direction of the housing (1); the rotary shaft assembly (2) includes a main shaft ( 21) With the thrust plate (22), the thrust plate (22) is coaxially arranged on the main shaft (21); A radial bearing (3), the radial bearing (3) is arranged in the housing (1), and the radial bearing (3) is coaxially sleeved outside the main shaft (21); The radial bearing (3) is used to apply a first force in the radial direction to the main shaft (21), so that the rotary shaft assembly (2) and the radial bearing (3) have the same axial center ; An axial bearing (4), the axial bearing (4) is arranged in the housing (1), the axial bearing (4) is coaxially sleeved on the outside of the main shaft (21), and The thrust discs (22) are axially oppositely arranged; the axial bearings (4) are used to apply a second force in the axial direction to the thrust discs (22), so that the rotary shaft assembly ( 2) Maintain a suspended state along the axial direction. The slewing bearing structure according to claim 1, characterized in that, Also includes: a first displacement sensor (11), a second displacement sensor (12) and a control device (13); The detection end of the first displacement sensor (11) is used to radially extend to the side of the main shaft (21) to detect the radial offset generated by the rotary shaft assembly (2); the first The displacement sensor (11) is connected in communication with the control device (13), and the control device (13) is connected in communication with the radial bearing (3); The detection end of the second displacement sensor (12) is used to extend axially toward the thrust plate (22) to detect the axial offset generated by the rotary shaft assembly (2); the second displacement The sensor (12) is in communication connection with the control device (13), and the control device (13) is in communication connection with the axial bearing (4). The slewing bearing structure according to claim 1, characterized in that, At least one of the radial bearing (3) and the axial bearing (4) is an electromagnetic bearing; when the radial bearing (3) is an electromagnetic bearing, the radial bearing (3) For applying a first radially outwardly directed force to said main shaft (21). The slewing bearing structure according to claim 3, characterized in that, When the radial bearing (3) is an electromagnetic bearing, a magnetic conduction ring (23) is formed on the side of the main shaft (21); the outer surface of the magnetic conduction ring (23) is connected to the radial bearing The inner surfaces of (3) are arranged radially opposite to each other. The slewing bearing structure according to claim 4, characterized in that, Also includes: radial protection shaft sleeve (5); The radial protection sleeve (5) is coaxially sleeved on the outside of the main shaft (21); the radial protection sleeve (5) is connected to the housing (1); the radial protection shaft A first radial gap is formed between the inner surface of the sleeve (5) and the outer surface of the main shaft (21); A second radial gap is formed between the inner surface of the radial bearing (3) and the outer surface of the magnetic permeable ring (23); the width of the second radial gap is greater than that of the first radial gap width. The slewing bearing structure according to claim 5, characterized in that, Two radial bearings (3) are provided, and the two radial bearings (3) are respectively located near the upper port and the lower port of the housing (1); The radial protection bushing (5) is provided with two, one of the radial protection bushings (5) is arranged on the upper port of the housing (1), and the other radial protection bushing ( 5) Set at the lower port of the casing (1). The slewing bearing structure according to claim 1, characterized in that, There are two axial bearings (4); the thrust disc (22) is arranged between the two axial bearings (4). The slewing support structure according to claim 7, characterized in that, Also includes: axial protection shaft sleeve (6); The axial protection sleeve (6) is coaxially sleeved on the outside of the main shaft (21); the axial protection sleeve (6) is connected to the lower port of the housing (1); the main shaft A stop step is formed on the side of (21), and a first axial gap is formed between the stop step and the opposite end surface of the axial protection sleeve (6); A second axial gap is formed between the axial bearing (4) and the opposite end surface of the thrust disc (22), and the width of the second axial gap is greater than the width of the first axial gap. A rotary table, comprising: a rotary seat (9) and a rotary drive mechanism (8), characterized in that it also includes a rotary support structure according to any one of claims 1 to 8; the rotary shaft assembly (2) The upper end is connected with the rotary base (9); the lower end of the rotary shaft assembly (2) is connected with the rotary drive mechanism (8). An operating machine, characterized by comprising the slewing support structure according to any one of claims 1 to 8, or the slewing table according to claim 9.

Images