Intelligent bearing device for pads of radial tilting-pad sliding bearing and online gap regulation and control method

Abstract

The invention relates to an intelligent tile supporting device of a radial tilting-pad sliding bearing and an online gap regulation and control method, and relates to the technical field of sliding bearing rotor dynamics. Comprising a stepping motor, a horizontal vibration displacement sensor, a vertical vibration displacement sensor, a control processor and two intelligent fulcrum devices which are symmetrically installed in the vertical direction and are of the same structure. The horizontal vibration displacement sensor and the vertical vibration displacement sensor are installed in the horizontal direction and the vertical direction of the rotor respectively and connected with the input end of the control processor, the output end of the control processor is connected with the input end of the stepping motor, and an output shaft of the stepping motor is connected with the intelligent fulcrum device. According to the invention, working parameters such as the bearing clearance and the preload can be timely adjusted on line according to the operation working conditions of the bearing and the rotor under the condition of no shutdown or disassembly, so that the rotor system has better vibration resistance and stability, and meanwhile, the sliding bearing keeps a reliable lubrication characteristic.

Description

Technical Field

[0001] The present invention relates to the technical field of sliding bearing rotor dynamics, and in particular to a tile intelligent support device for a radially tilting pad journal bearing and an online clearance regulation method thereof. Background Art

[0002] Radial journal bearings have been widely used in rotating machinery systems due to their good load-carrying performance and stability. Among them, radially tilting pad journal bearings have become important support components in high-speed rotor systems due to their superior stability and vibration resistance characteristics, such as steam turbines, generators, compressors, turbines, high-speed spindles, and wind power spindles. Bearing preload is an important core parameter for bearing stiffness damping design and achieving good stability of the rotor system. Specifically, the bearing preload is closely related to the geometric clearance formed by the installation position of the bearing pad fulcrum. Generally, tilting pad journal bearings are designed for specific working conditions, and the position of the bearing pad fulcrum and the theoretical clearance are fixed. During actual operation, due to installation errors or the evolution of the vibration characteristics of the rotor system, the bearing performance cannot always maintain the optimal operating state. Especially for large-sized tilting pad bearings, since the installed clearance parameters cannot enable the bearing to achieve the designed operating performance, it is necessary to stop the machine and consume a large amount of work for disassembling and adjusting the position of the bearing pad fulcrum. For light-load high-speed rotor systems, in the face of excessive vibration, it is impossible to suppress the excessive vibration under non-stop conditions, which may lead to safety problems such as excessive rotor vibration and bearing damage. Therefore, it is very necessary to design a tile intelligent support device for a radially tilting pad journal bearing and an online clearance regulation method thereof. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a tile intelligent support device for a radially tilting pad journal bearing and an online clearance regulation method thereof. Without stopping the machine or disassembling the machine, the working parameters such as the bearing clearance and preload can be adjusted online and in a timely manner according to the operating conditions of the bearing and the rotor, so that the rotor system has better vibration resistance and stability, and at the same time, the sliding bearing maintains reliable lubrication characteristics.

[0004] To achieve the above object, the present invention provides a tile intelligent support device for a radially tilting pad journal bearing, including: a stepping motor, a horizontal vibration displacement sensor, a vertical vibration displacement sensor, a control processor, and two identically structured intelligent fulcrum devices symmetrically installed along the vertical direction; the horizontal vibration displacement sensor and the vertical vibration displacement sensor are respectively installed in the horizontal and vertical directions of the rotor and are connected to the input end of the control processor, the output end of the control processor is connected to the input end of the stepping motor, and the output shaft of the stepping motor is connected to the intelligent fulcrum device.

[0005] Further, the intelligent fulcrum device includes a motor shaft sleeve, a fulcrum adjustment component, a bearing bush mounting component, an elastic limit component, and a bearing bush support component; the motor shaft sleeve is connected to the fulcrum adjustment component, one end of the motor shaft sleeve is connected to the output shaft of the stepping motor, and the other end is connected to the fulcrum adjustment component; the bearing bush mounting component penetrates through the fulcrum adjustment component and is connected to the bearing bush; the elastic limit component is slidably disposed in a groove formed by the motor shaft sleeve and the fulcrum adjustment component; the bearing bush support component is slidably disposed in a cavity formed by the fulcrum adjustment component and the bearing housing, and rigidly supports the bearing bush.

[0006] Further, the fulcrum adjustment component includes a transmission screw and a transmission nut. The transmission nut is fixedly connected to the bearing housing through a connecting bolt. The motor shaft sleeve is connected to a transmission connection groove at the upper end of the transmission screw through a key. The transmission screw meshes with the transmission nut through threads and realizes the change of the meshing length.

[0007] Further, the bearing bush mounting component includes a mounting connecting rod and antifriction steel balls II. The antifriction steel balls II are placed in a groove in the inner cavity of the transmission screw. The mounting connecting rod passes through the inner hole of the transmission screw and is connected to the bearing bush through threads.

[0008] Further, the elastic limit component includes a fulcrum end cover, a preloading spring, a spring support plate, and antifriction steel balls I; the antifriction steel balls I are placed in a spherical groove on the upper end face of the outer circle of the transmission screw. The spring support plate is placed on the antifriction steel balls I. The preloading spring is arranged in a groove on the upper surface of the spring support plate. The fulcrum end cover is fixed to the bearing housing through a preloading bolt, and the inner surface of the upper end of the fulcrum end cover abuts against the preloading spring.

[0009] Further, the bearing bush support component includes a bearing bush support seat and a disc spring preloading component; the mounting connecting rod penetrates through the bearing bush support seat. The outer end of the bearing bush support seat is clamped with the bearing bush, and the inner end abuts against the disc spring preloading component.

[0010] Further, the disc spring preloading component includes a disc spring group, a disc spring pressing plate, a thrust ball bearing, and a preloading nut; the disc spring group is placed in a groove at the lower end of the bearing housing. The preloading nut preloads the disc spring group through meshing with the transmission screw. A thrust ball bearing and a disc spring pressing plate are sequentially arranged between the preloading nut and the disc spring group.

[0011] An online clearance regulation method for the intelligent support device of the tilting pad of a radial tilting pad journal bearing. First, the real-time values of the horizontal radial displacement and vertical radial displacement of the rotor during operation are monitored by a horizontal vibration displacement sensor and a vertical vibration displacement sensor, and then transmitted to the control processor. The control processor compares the received rotor vibration displacement data with the vibration critical value in real time. When the rotor vibration displacement data exceeds the set critical value and lasts for at least 1 - 2 s, the control processor sends a signal to make the rotor drive motor reduce the speed and avoid the alarm speed by at least 20% and maintain it, and judges the vibration signal to propose a clearance adjustment plan. The control processor converts the displacement value to be adjusted into an angular signal and outputs the angular electrical signal to the stepping motor. The stepping motor drives the transmission screw to rotate a target angle through the motor sleeve, realizes the change of the bearing pad fulcrum displacement, and further achieves the goal of adjusting the clearance between the bearing pad and the rotor surface.

[0012] The beneficial effects of the present invention are as follows:

[0013] The clearance of the tilting pad journal bearing is an important structural parameter for regulating the bearing stiffness and damping, and the bearing stiffness and damping are closely related to the vibration characteristics of the rotor system. In the prior art, the bearing pad clearance after the sliding bearing is installed is fixed and cannot be adjusted. In the case of unreasonable bearing installation or excessive rotor vibration, only by stopping the machine and disassembling the machine can the bearing parameters be adjusted, which is extremely laborious. The intelligent support device of the bearing pad proposed by the present invention realizes the change of the bearing pad fulcrum position by driving the transmission screw to feed by the stepping motor, and further realizes the regulation of the bearing pad clearance. This structure does not require stopping the machine or even disassembling the machine. Only by reducing the speed and realizing the online regulation of the bearing pad clearance at low speed, the regulation of the stiffness and damping within a wide clearance parameter range can be realized, and the reliability and stability of the bearing rotor system operation can be improved. At the same time, by the intelligent fulcrum device, the fixed parameter bearing is transformed into a variable structure parameter bearing, realizing the adaptive adaptation of the bearing structure and function, and expanding the working parameter range and stability control range of the tilting pad journal bearing. The disc spring preloading assembly can adjust the bearing pad fulcrum stiffness by the number of disc spring groups, the combination mode and the preloading distance. At the same time, when the bearing pad clearance is adjusted at the micron level, the millimeter-level preloading size of the disc spring preloading assembly can ensure that the bearing pad fulcrum stiffness remains almost unchanged when the bearing pad clearance is adjusted at the micron level. Through the design of the meshing pitch of the transmission screw and the transmission nut, the control of the bearing pad clearance adjustment accuracy can be realized, that is, the feed displacement when the transmission screw rotates 360°.

[0014] The rotor vibration monitoring and on-line regulation method of the clearance of the tilting pad bearing blocks proposed by the present invention ensures the realization of the clearance regulation of the intelligent bearing block device. When the vibration of the rotor system exceeds the alarm value and lasts for a certain period of time, the control processor controls the rotor drive motor to reduce the speed to the safe speed, judges the vibration signal, proposes a clearance adjustment scheme according to the bearing clearance-stiffness damping-vibration displacement database, and the control processor sends a signal to control the stepping motor to adjust the position of the bearing pad fulcrum and the bearing pad clearance, regulates the stiffness damping characteristics of the bearing and improves the anti-vibration performance of the rotor at the alarm speed, so that the rotor system has excellent vibration characteristics and stability. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the intelligent bearing block device of the present invention;

[0016] Figure 2 It is a sectional view of the intelligent fulcrum device of the present invention.

[0017] Wherein, in the figure: 1 - fulcrum end cover; 2 - pre-tightening bolt; 3 - antifriction steel ball I; 4 - pre-tightening spring; 5 - connecting key; 6 - driving screw; 7 - antifriction steel ball II; 8 - installation connecting rod; 9 - motor shaft sleeve; 10 - spring support plate; 11 - driving nut; 12 - connecting bolt; 13 - bearing seat; 14 - disc spring group; 15 - disc spring pressing plate; 16 - thrust ball bearing; 17 - pre-tightening nut; 18 - bearing pad support seat; 19 - bearing pad; 20 - rotor; 21 - horizontal vibration displacement sensor; 22 - vertical vibration displacement sensor; 23 - control processor; 24 - stepping motor; 25 - rotor drive motor. Detailed Embodiment

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0021] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0022] In addition, the terms "mount", "set", "provided with", "connect", "connected", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] The present invention provides a tile intelligent support device and an online clearance regulation method for a radially tilting pad journal bearing, which can realize the online regulation of the vibration of the rotor system, and further expand the working parameter range and stability control range of the tilting pad journal bearing. When the vibration of the rotor system is too large, the vibration signal collected by the displacement sensor is sent to the control processor. By judging the characteristics of the vibration signal, the control processor issues a signal to control the stepper motor and change the position of the bearing pad fulcrum, adjust the clearance between the bearing pad and the rotor surface, improve the stiffness damping characteristics of the bearing, suppress the amplitude of the rotor, and improve the reliability and stability of the operation of the bearing rotor system.

[0024] Such as Figure 1-2As shown in the figure, the present invention provides an intelligent support device for the pads of a radially tilting pad journal bearing, including: a stepper motor 24, a horizontal vibration displacement sensor 21, a vertical vibration displacement sensor 22, a control processor 23, and two intelligent support devices with the same structure symmetrically installed along the vertical direction; the horizontal vibration displacement sensor 21 and the vertical vibration displacement sensor 22 are respectively installed in the horizontal and vertical directions of the rotor 20 and are connected to the input end of the control processor 23, the output end of the control processor 23 is connected to the input end of the stepper motor 24, and the output shaft of the stepper motor 24 is connected to the intelligent support device. The vibration displacement sensors input the collected rotor vibration data into the control processor. When the rotor vibration data exceeds the critical value and remains for more than 1 - 2 seconds, the control processor reduces the rotor speed to the safe speed, gives the gap adjustment value, and controls the stepper motor to drive the intelligent support device to adjust the gap between the bearing bush and the rotor, improve the stiffness and damping of the bearing, and ensure that the rotor system has good anti-vibration characteristics and operating stability.

[0025] The intelligent support device includes a motor sleeve 9, a fulcrum adjustment component, a bearing bush installation component, an elastic limit component, and a bearing bush support component; the motor sleeve 9 is connected to the fulcrum adjustment component, one end of the motor sleeve 9 is connected to the output shaft of the stepper motor 24, and the other end is connected to the fulcrum adjustment component; the bearing bush installation component penetrates through the fulcrum adjustment component and is connected to the bearing bush 19; the elastic limit component is slidably arranged in the groove formed by the motor sleeve 9 and the fulcrum adjustment component; the bearing bush support component is slidably arranged in the cavity formed by the fulcrum adjustment component and the bearing housing and rigidly supports the bearing bush 19.

[0026] The fulcrum adjustment component includes a transmission screw 6 and a transmission nut 11. The transmission nut 11 is fixedly connected to the bearing housing 13 through a connecting bolt 12. The motor sleeve 9 is connected to the transmission connection groove at the upper end of the transmission screw 6 through a connection key 5 and can drive the transmission screw to rotate. The transmission screw 6 meshes with the transmission nut 11 through a thread and realizes the change of the meshing length.

[0027] The bearing bush installation component includes an installation connecting rod 8 and a friction-reducing steel ball II 7. The friction-reducing steel ball II 7 is placed in the groove in the inner cavity of the transmission screw 6 to avoid direct contact between the installation connecting rod 8 and the transmission screw 6 and realize the low-torque rotation of the installation connecting rod 8. The installation connecting rod 8 passes through the inner hole of the transmission screw 6 and is connected to the bearing bush 19 through a thread.

[0028] The elastic limit component includes a fulcrum end cover 1, a pre-tightening spring 4, a spring support plate 10, and a friction-reducing steel ball 1-3. The friction-reducing steel ball 1-3 is placed in the spherical groove on the upper end face of the outer circle of the transmission screw 6. The spring support plate 10 is placed on the friction-reducing steel ball 1-3. The pre-tightening spring 4 is arranged in the groove on the upper surface of the spring support plate 10. The fulcrum end cover 1 is fixed to the bearing seat 13 by a pre-tightening bolt 2, and the inner surface of the fulcrum end cover 1 abuts against the pre-tightening spring 4.

[0029] The bearing bush support component includes a bearing bush support seat 18 and a disc spring pre-tightening component. The installation connecting rod 8 passes through the bearing bush support seat 18. The outer end of the bearing bush support seat 18 is clamped with the bearing bush 19, and the inner end abuts against the disc spring pre-tightening component. The installation connecting rod 8 passes through the inner hole of the transmission screw 6 and is connected to the bearing bush 19 by threads, jointly forming a support structure for the bearing bush 19. The spatial position of the bearing bush 19 is precisely adjusted by the transmission screw 6, so that a proper gap is maintained between the bearing bush 19 and the rotor 20. Then, the installation connecting rod 8 and the friction-reducing steel ball 2-7 are removed, and finally, the elastic limit component elastically limits the transmission screw 6.

[0030] The disc spring pre-tightening component includes a disc spring group 14, a disc spring pressure plate 15, a thrust ball bearing 16, and a pre-tightening nut 17. The disc spring group 14 is placed in the groove at the lower end of the bearing seat 13. The pre-tightening nut 17 pre-tightens the disc spring group 14 by meshing with the transmission screw 6. A thrust ball bearing 16 and a disc spring pressure plate 15 are sequentially arranged between the pre-tightening nut 17 and the disc spring group 14.

[0031] The present invention also provides an on-line clearance regulation method for the intelligent support device of the pad of a radially tilting pad journal bearing. First, the horizontal vibration displacement sensor 21 and the vertical vibration displacement sensor 22 are used to monitor the real-time values of the horizontal radial displacement and the vertical radial displacement of the rotor 20 in the working state, and then the data is transmitted to the control processor 23. The control processor 23 compares the received vibration displacement data with the vibration critical value in real time. When the rotor vibration displacement data exceeds the set critical value, an alarm will be issued, and the rotational speed at this time will be recorded. If the vibration displacement data still exceeds the critical value within at least 1 - 2 s, the control processor 23 will send a signal to make the rotor drive motor 25 reduce the rotational speed and avoid the alarm rotational speed by at least 20% and maintain it, and judge the vibration signal, and propose a clearance adjustment plan according to the bearing clearance - stiffness damping - vibration displacement database. This judgment work and adjustment plan can be realized by the operation of the staff or the algorithm built in the controller. After the clearance adjustment plan is determined, the control processor 23 converts the displacement value to be adjusted into an angle signal, and outputs the angle electrical signal to the stepping motor 24. The stepping motor 24 drives the transmission screw 6 to rotate by a target angle through the motor sleeve 9 to achieve displacement feeding. The pre-tightening nut 17 rotates together with the transmission screw 6 to make the disc spring assembly 14 expand and contract. The displacement of the disc spring assembly 14 is equal to the displacement of the transmission screw 6. The disc spring pressing plate 15 and the bearing support seat 18 change with the displacement of the disc spring assembly 14, so as to change the displacement of the bearing support point, and further achieve the goal of adjusting the clearance between the bearing bush 19 and the surface of the rotor 20. Further, the rotor drive motor 25 drives the rotor 20 to increase the speed and reach the target operating speed to ensure that the rotor system has good anti-vibration characteristics and operating stability.

[0032] The clearance of a tilting pad journal bearing is an important structural parameter for regulating the bearing stiffness and damping, and the bearing stiffness and damping are closely related to the vibration characteristics of the rotor system. Under the existing technology, the pad clearance after the sliding bearing is installed is fixed and cannot be adjusted. In the case of unreasonable bearing installation or excessive rotor vibration, only by stopping the machine and disassembling the bearing can the bearing parameters be adjusted, which is extremely laborious. The pad intelligent support device proposed by the present invention realizes the change of the pad fulcrum position through the driving of a stepping motor to drive a transmission screw to feed, and further realizes the regulation of the pad clearance. This structure does not require stopping the machine or even disassembling it. Only by reducing the speed and realizing the on-line regulation of the pad clearance at a low speed can the regulation of the stiffness and damping be achieved within a wide clearance parameter range, and the reliability and stability of the bearing-rotor system operation can be improved. At the same time, by using the intelligent fulcrum device, the fixed-parameter bearing is transformed into a variable-structure parameter bearing, realizing the adaptive adaptation of the bearing structure and function, and expanding the working parameter range and stability control range of the tilting pad journal bearing. The disc spring pre-tightening assembly can adjust the pad fulcrum stiffness by the number of disc spring groups, the combination mode and the size of the pre-tightening distance. At the same time, when the pad clearance is adjusted at the micron level, the millimeter-level pre-tightening size of the disc spring pre-tightening assembly can ensure that the pad fulcrum stiffness remains almost unchanged when the pad clearance is adjusted at the micron level. Through the design of the pitch of the meshing of the transmission screw and the transmission nut, the control of the pad clearance adjustment accuracy can be realized, that is, the feed displacement when the transmission screw rotates 360°.

[0033] The rotor vibration monitoring and on-line regulation method of the tilting pad bearing pad clearance proposed by the present invention ensures the realization of the clearance regulation of the pad intelligent support device. When the vibration of the rotor system exceeds the alarm value and lasts for a certain period of time, the control processor controls the rotor drive motor to reduce the speed to a safe speed, judges the vibration signal, proposes a clearance adjustment plan according to the bearing clearance-stiffness damping-vibration displacement database, and the control processor issues a signal to control the stepping motor to adjust the pad fulcrum position and the pad clearance, regulate the stiffness and damping characteristics of the bearing and improve the vibration resistance of the rotor at the alarm speed, so that the rotor system has excellent vibration characteristics and stability.

[0034] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An intelligent supporting device for the pad of a tilting pad journal bearing, characterized in that, Including: A stepper motor (24), a horizontal vibration displacement sensor (21), a vertical vibration displacement sensor (22), a control processor (23), and two intelligent fulcrum devices with the same structure symmetrically installed in the vertical direction; the horizontal vibration displacement sensor (21) and the vertical vibration displacement sensor (22) are respectively installed in the horizontal and vertical directions of the rotor (20) and are connected to the input end of the control processor (23), the output end of the control processor (23) is connected to the input end of the stepper motor (24), and the output shaft of the stepper motor (24) is connected to the intelligent fulcrum device.

2. The intelligent supporting device for the pad of a radially tilting pad journal bearing according to claim 1, wherein The intelligent fulcrum device includes a motor shaft sleeve (9), a fulcrum adjustment component, a bearing bush installation component, an elastic limit component, and a bearing bush support component; the motor shaft sleeve (9) is connected to the fulcrum adjustment component, one end of the motor shaft sleeve (9) is connected to the output shaft of the stepper motor (24), and the other end is connected to the fulcrum adjustment component; the bearing bush installation component penetrates through the fulcrum adjustment component and is connected to the bearing bush (19); the elastic limit component is slidably arranged in the groove formed by the motor shaft sleeve (9) and the fulcrum adjustment component; the bearing bush support component is slidably arranged in the cavity formed by the fulcrum adjustment component and the bearing seat and rigidly supports the bearing bush (19).

3. The intelligent supporting device for the pad of a radially tilting pad journal bearing according to claim 2, characterized in that, The fulcrum adjustment component includes a transmission screw (6) and a transmission nut (11), the transmission nut (11) is fixedly connected to the bearing seat (13) through a connecting bolt (12), the motor shaft sleeve (9) is connected to the transmission connection groove at the upper end of the transmission screw (6) through a connecting key (5), and the transmission screw (6) meshes with the transmission nut (11) through a thread and realizes the change of the meshing length.

4. The intelligent supporting device for the pad of a radially tilting pad journal bearing according to claim 3, wherein The bearing bush installation component includes an installation connecting rod (8) and an antifriction steel ball II (7), the antifriction steel ball II (7) is placed in the groove in the inner cavity of the transmission screw (6), and the installation connecting rod (8) passes through the inner hole of the transmission screw (6) and is connected to the bearing bush (19) through a thread.

5. The intelligent supporting device for the pad of a radially tilting pad journal bearing according to claim 2 or 4, characterized in that, The elastic limit component includes a fulcrum end cover (1), a pre-tightening spring (4), a spring support plate (10), and an antifriction steel ball I (3); the antifriction steel ball I (3) is placed in the spherical groove on the upper end face of the outer circle of the transmission screw (6), the spring support plate (10) is placed on the antifriction steel ball I (3), the pre-tightening spring (4) is arranged in the groove on the upper surface of the spring support plate (10), the fulcrum end cover (1) is fixed to the bearing seat (13) through a pre-tightening bolt (2), and the inner surface of the upper part of the fulcrum end cover (1) abuts against the pre-tightening spring (4).

6. The intelligent supporting device for the pad of a radially tilting pad journal bearing according to claim 4, characterized in that, The bearing bush support component includes a bearing bush support seat (18) and a disc spring pre-tightening component; the installation connecting rod (8) penetrates through the bearing bush support seat (18), the outer side end of the bearing bush support seat (18) is clamped with the bearing bush (19), and the inner side end abuts against the disc spring pre-tightening component.

7. The intelligent supporting device for the pad of a radially tilting pad journal bearing according to claim 6, characterized in that, The disc spring preloading assembly includes a disc spring group (14), a disc spring pressure plate (15), a thrust ball bearing (16) and a preloading nut (17); the disc spring group (14) is placed in a groove at the lower end of the bearing seat (13), the preloading nut (17) preloads the disc spring group (14) by meshing with the transmission screw (6), and a thrust ball bearing (16) and a disc spring pressure plate (15) are sequentially arranged between the preloading nut (17) and the disc spring group (14).

8. The on-line clearance regulation method of the intelligent support device of the pad of a radially tilting pad journal bearing according to any one of claims 1-7, characterized in that, First, the horizontal vibration displacement sensor (21) and the vertical vibration displacement sensor (22) are used to monitor the real-time values of the horizontal radial displacement and the vertical radial displacement of the rotor (20) in the working state, and then the data is transmitted to the control processor (23). The control processor (23) compares the received rotor vibration displacement data with the vibration critical value in real time. When the rotor vibration displacement data exceeds the set critical value and lasts for at least 1 - 2 s, the control processor (23) sends a signal to make the rotor drive motor (25) reduce the speed and avoid the alarm speed by at least 20% and maintain it, and judges the vibration signal to propose a gap adjustment plan. The control processor (23) converts the displacement value to be adjusted into an angle signal and outputs the angle electrical signal to the stepping motor (24). The stepping motor (24) drives the transmission screw (6) to rotate by a target angle through the motor bushing (9), realizes the change of the bearing pad fulcrum displacement, and further achieves the goal of adjusting the gap between the bearing pad (19) and the surface of the rotor (20).

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