CN111927874A

CN111927874A - Sliding thrust bearing for realizing load uniform distribution among tiles through cam linkage

Info

Publication number: CN111927874A
Application number: CN202010601397.5A
Authority: CN
Inventors: 安海阳; 李溶江; 赵卫军; 舒文号; 王丹琦
Original assignee: DEC Dongfang Turbine Co Ltd
Current assignee: DEC Dongfang Turbine Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-11-13
Anticipated expiration: 2040-06-29
Also published as: CN111927874B

Abstract

The invention discloses a sliding thrust bearing for realizing uniform load distribution among pads by cam linkage, and relates to the technical field of large-scale rotating mechanical bearings; the thrust bearing bush comprises a bearing bush sleeve and a thrust bearing bush component, wherein the thrust bearing bush component is arranged in the bearing bush sleeve through an installation groove; the thrust pad component comprises a holding ring, thrust pads and a cam linkage mechanism, wherein the cam linkage mechanism comprises cam blocks and linkage blocks which are arranged corresponding to the thrust pads, the cam blocks and the linkage blocks are arranged in a mutually staggered manner, the cam blocks can rotate between the inner walls of the holding ring, the linkage blocks can swing between the inner walls of the holding ring, and two swinging ends of the linkage blocks are respectively contacted with the adjacent cam blocks; through implementing this technical scheme, can effectively solve the technical problem of the unbalanced atress between each tile of current sliding thrust bearing to make each tile carry out self-adaptation adjustment to the atress through this cam link gear, when avoiding the sphere cooperation unfavorable factor, fine realization inter-tile load equipartition, finally reach the balanced characteristic of atress between the tile.

Description

Sliding thrust bearing for realizing load uniform distribution among tiles through cam linkage

Technical Field

The invention relates to the technical field of large-scale rotating machinery bearings, in particular to a sliding thrust bearing which realizes uniform load distribution among pads through cam linkage.

Background

At present, a sliding thrust bearing is widely applied to large-scale power generation equipment such as thermal power, nuclear power, gas turbines and the like due to the superior characteristics, the sliding thrust bearing is a key component for bearing the axial thrust of a rotor and limiting the axial displacement of the rotor to ensure the dynamic and static gaps in the steam turbine, in order to ensure that all thrust pads are uniformly stressed, a spherical surface matching structure is adopted between a bearing bush body and a bearing bush sleeve of the existing steam turbine thrust bearing to realize the self-aligning function of the thrust bearing, but the spherical surface structure has high processing precision requirement and high manufacturing difficulty, has strong dependence on the assembly level, and the self-aligning capability is reduced or fails due to spherical surface blocking in the actual operation, once the self-aligning capability fails, the thrust pads lose the mechanism along with the swinging of a thrust disc, the integral stress of the thrust bearing is nonuniform, and the local pads bear the metal temperature of heavy pads is too high, the problem of influencing the safe operation of the unit.

Disclosure of Invention

In order to solve the technical problem of unbalanced stress among the pads of the conventional sliding thrust bearing, the invention aims to provide the sliding thrust bearing for realizing uniform load distribution among the pads by cam linkage.

The technical scheme adopted by the invention is as follows:

a sliding thrust bearing with uniform load distribution among pads in cam linkage comprises

The bearing bush sleeve is of a hollow annular structure, and an installation groove is formed in the annular structure;

the thrust pad assembly is arranged in the bearing bush sleeve through the mounting groove; the thrust pad assembly comprises a holding ring and a plurality of thrust pads which are uniformly distributed in a circle along the annular end surface on one side of the holding ring, and

the cam linkage mechanism is positioned between the inner walls of the retaining rings on the back surfaces of the thrust pads and comprises a plurality of cam blocks and a plurality of linkage blocks, the cam blocks and the linkage blocks are arranged in a mutually staggered manner, the cam blocks are positioned on one sides of the linkage blocks, which are far away from the circle center of the retaining rings, the cam blocks are provided with cam rotating shafts which are axially vertical to the retaining rings so as to be capable of rotating between the inner walls of the retaining rings, one ends of the cam rotating shafts are contacted with the bottoms of the thrust pads, and the other ends of the cam rotating shafts are contacted with the linkage blocks; the linkage block is provided with a linkage rotating shaft which is perpendicular to the radial direction of the holding ring so that the linkage block can swing between the inner walls of the holding ring, two swinging ends of the linkage block are respectively contacted with the adjacent cam blocks, so that after one thrust pad receives axial thrust of the bearing, the cam block corresponding to the thrust pad rotates under the thrust of the thrust pad, the linkage block is synchronously linked to swing, and then the linkage block drives the adjacent cam block to rotate so that the adjacent thrust pad reversely feeds the thrust, and the linkage of the whole circle of thrust pad is realized.

Thrust tile subassembly theory of operation among this technical scheme: taking the case that the whole circle of thrust pads comprises a thrust pad A and a thrust pad B, the thrust pad A and the thrust pad B are arranged in a staggered manner; when one thrust pad A is subjected to axial thrust of the bearing, the thrust pad A can move towards the back to act on the cam block, and due to the characteristics of the cam structure, the thrust pad A rotates along the cam rotating shaft to drive the linkage block to swing, the linkage block and the linkage rotating shaft are matched to form a 'seesaw' structure, two swinging ends of the linkage block are respectively contacted with adjacent cam blocks, the force of the thrust pad A acting on the corresponding cam block can be transmitted to the adjacent cam blocks through the structure, the thrust pad A acts on the cam block matched with the thrust pad B, the thrust pad B is reversely fed to the thrust pad A, the acting force on the thrust pad A is balanced, and the cam linkage mechanism and the thrust pad are balanced until the acting force of the thrust pad A and the acting force of the thrust pad B are equal in the whole circle; among the above-mentioned technical scheme, during sliding thrust bearing work operation, because the cam piece at whole circle thrust tile piece back is in the same place through the linkage of linkage piece, each thrust tile piece can carry out self-adaptation adjustment to the atress through the cam link gear that cam piece and linkage piece constitute from this, when avoiding the sphere cooperation unfavorable factor, fine realization inter-tile load equipartition, finally reach the balanced characteristic of atress between the tile piece, this structural design is ingenious reasonable, has fine popularization and use value.

Preferably, the retainer ring includes a retainer ring inner ring and a retainer ring outer ring, and a fixing groove for mounting the thrust pad and a space between the retainer ring inner walls for mounting the cam link mechanism are formed between the retainer ring inner ring and the retainer ring outer ring. The effect of fixed slot lies in embracing the thrust tile, prevents that the tile from taking off from the axis body pine, plays the limiting displacement to the thrust tile.

Preferably, the thrust pad is of a fan-shaped structure and comprises a large end and a small end integrally connected with the large end, and the fixing groove is formed in the outer ring of the holding ring and used for limiting the thrust pad from moving along the circumferential direction.

Preferably, the linkage rotating shaft configured to the linkage block is a first pin shaft, the first pin shaft is radially perpendicular to the holding ring, and a pin seat extending radially outward along the first pin shaft is arranged on the side wall surface of the outer edge of the inner ring of the holding ring and used for mounting the first pin shaft, so that the linkage block can swing between the inner walls of the holding ring by taking the first pin shaft as a central axis. By adopting the structure, the linkage block is rotationally connected to the side wall surface of the outer edge of the inner ring of the holding ring through the first pin shaft, the first pin shaft is used as a central shaft, and the linkage block is in transmission connection with the cam blocks which are contacted with the two ends of the linkage block between the inner walls of the holding ring by adopting a lever principle.

Preferably, the two side extending ends of the linkage block are symmetrically arranged relative to the first pin shaft, and the end faces of the arc structures formed by the end parts of the two side extending ends are in contact with the cam block, so that the acting force is transmitted uniformly and stably.

Preferably, in the above technical solution, the cam rotating shaft of the cam block is a second pin shaft, the second pin shaft is axially perpendicular to the holding ring, and an inner groove for mounting the second pin shaft is formed on a side wall surface of an inner edge of the outer ring of the holding ring, so that the cam block can rotate between the inner walls of the holding ring by using the second pin shaft as a central axis. By adopting the structure, the structure design of the holding ring structure and the cam linkage mechanism is compact, each thrust pad is subjected to self-adaptive adjustment on stress through the cam linkage mechanism, stress transmission is uniform and stable, and finally the characteristic of balanced stress of each thrust pad is achieved.

Preferably, the cam block has an upper outer extension end and a lower outer extension end, which are centered on the second pin shaft, so that the thrust pad is in contact with the upper surface of the upper outer extension end of the cam block, and the linkage block is in contact with the upper surface of the lower outer extension end. By adopting the structural design of the cam block, the cam block is matched with the linkage block in an adaptive manner by utilizing the lever principle, the balance and the stability of the transmission acting force can be effectively kept, and the structural design is ingenious and reasonable.

Preferably, the thrust pad assemblies in the bearing bush sleeve comprise two thrust pad assemblies, the two thrust pad assemblies are arranged side by side, and the annular end surfaces of the two thrust pad assemblies on the side with the thrust pads are arranged oppositely. During the operation of the sliding thrust bearing, the thrust pad assembly on one side is the thrust pad assembly close to the motor side, and the thrust pad assembly on the other side is the thrust pad assembly close to the steam turbine side.

As the optimization of the technical scheme, each thrust pad component comprises 8-10 thrust pads, and during the working and running of the sliding thrust bearing, the thrust pads of each thrust pad component can achieve quick linkage stress adjustment so as to ensure stress balance, so that the whole stress of the sliding thrust bearing is uniform, and the safe running of a unit is ensured.

Preferably, the bearing bush sleeve comprises an upper half shaft bush sleeve and a lower half shaft bush sleeve, and the upper half shaft bush sleeve and the lower half shaft bush sleeve are connected through a bolt on a matching surface of the upper half shaft bush sleeve and the lower half shaft bush sleeve.

As described above, the present invention has at least the following advantages over the prior art:

1. the sliding thrust bearing adopts the cam linkage mechanism consisting of the cam blocks and the linkage blocks arranged between the inner walls of the retaining rings to be in matched linkage with each tile block, so that each tile block can be subjected to self-adaptive adjustment on stress through the cam linkage mechanism, the uniform distribution of load among the tile blocks is well realized while the adverse factors of spherical surface matching are avoided, and finally the characteristic of balanced stress among the tile blocks is achieved.

2. The sliding thrust bearing has compact structural design, the cam linkage mechanism consisting of the cam blocks and the linkage blocks is skillfully matched with each tile block, and the linkage blocks are matched with the pin shafts to form a seesaw type swinging structure, so that the linkage blocks are in transmission connection with the cam blocks contacted with two ends of the linkage blocks by adopting a lever principle between the inner walls of the supporting rings, and the uniform and stable transmission of acting force is ensured; the cam block is provided with an upper external extending end and a lower external extending end and is matched with the second pin shaft to form a rotating structure, so that the cam block can be effectively ensured to be in close contact with the corresponding thrust pad and the corresponding linkage block to interact, the cam block can be matched with the linkage block in an adaptive manner by utilizing the lever principle in the same way, the balance and the stability of the transmission acting force can be effectively kept, and the structural design is ingenious and reasonable.

3. The thrust pad component has simple structure and high assembly speed, can meet the requirements of high reliability and stability during the operation of equipment and high load of the thrust bearing of the existing steam turbine, is a novel sliding bearing structure for realizing the load uniform distribution among pads by cam linkage, has no abnormal condition of the sliding thrust bearing in the whole practical operation process, has normal temperature of the whole bearing pad, and actually verifies the reasonability and safety of the novel sliding bearing for realizing the load uniform distribution among pads by cam linkage, can greatly increase the maintenance period of power generation equipment, reduces the operation and maintenance cost, and has good application prospect.

Drawings

The invention will be described by way of specific embodiments and with reference to the accompanying drawings, in which

FIG. 1 is an assembly view of a sliding thrust bearing with cam linkage for achieving load sharing among pads in accordance with an exemplary embodiment of the present invention;

FIG. 2 is an assembly view of a thrust shoe assembly in an exemplary embodiment of the invention;

FIG. 3 is an assembly view from another perspective of the thrust shoe assembly in an exemplary embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a retaining ring in an exemplary embodiment of the invention;

FIG. 5 is a schematic diagram of a linkage block in an exemplary embodiment of the invention;

FIG. 6 is a schematic view of a cam block in an exemplary embodiment of the invention;

FIG. 7 is a schematic cross-sectional view of a cam block in accordance with an exemplary embodiment of the present invention;

fig. 8 is a schematic diagram of the cam linkage for uniform load distribution between pads according to the exemplary embodiment of the present invention.

Description of reference numerals: 1-bearing bush sleeve; 11-upper half axle bush; 12-lower half bush housing; 2-a thrust shoe assembly; 21-motor side thrust shoe assembly; 22-turbine side thrust shoe assembly; 23-a retaining ring; 231-inner ring of holding ring; 232-holding ring outer ring; 233-holding the space between the inner walls of the rings; 24-a thrust pad; 25-a fixed groove; 26-inner grooves; 3-a cam linkage mechanism; 31-a cam block; 311-upper outer extension; 312-a lower, outwardly extending end; 32-a linkage block; 321-two side extension ends; 322-arc structure end face; 33-pin shaft one; 34-a pin seat; and 35-a second pin shaft.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The embodiment is basically as shown in figure 1: the embodiment provides a sliding thrust bearing for realizing uniform load distribution among pads through cam linkage, which is applied to a steam turbine to bear the axial thrust of a rotor and limit the axial displacement of the rotor; the sliding thrust bearing comprises a bearing bush sleeve 1 and a thrust bush component 2, wherein the bearing bush sleeve 1 comprises an upper half bearing bush sleeve 11 and a lower half bearing bush sleeve 12, the upper half bearing bush sleeve 11 and the lower half bearing bush sleeve 12 are connected through a bolt on a matching surface of the upper half bearing bush sleeve and the lower half bearing bush sleeve 12, the bearing bush sleeve 1 is specifically in a hollow annular structure, and an installation groove for installing the thrust bush component 2 is formed in the annular structure; thrust tile subassembly 2 that this embodiment provided is including two, and be close to motor side thrust tile subassembly 21 and be close to steam turbine side thrust tile subassembly 22 respectively, and two thrust tile subassemblies 2 are and set up side by side and install in axle bush cover 1 through the mounting groove.

Please refer to fig. 2 and fig. 3, the thrust pad assembly 2 provided in this embodiment includes a holding ring 23, 8-10 thrust pads 24 uniformly distributed in a circle along an annular end surface of one side of the holding ring 23, and a cam linkage mechanism 3, the annular end surfaces of the two thrust pad assemblies 2 on the side of the thrust pads 24 are oppositely arranged, in this embodiment, 10 thrust pads 24 are provided on each thrust pad assembly 2, wherein fig. 2 and fig. 3 show an assembly diagram of the thrust pad assembly 2 in this embodiment after removing 3 thrust pads 24 right above, during the operation of the sliding thrust bearing, the thrust pads 24 of each thrust pad assembly 2 can be quickly linked and stressed by the cam linkage mechanism 3 to achieve quick linked stress adjustment, so as to ensure stress balance, and further make the whole thrust bearing uniformly stressed, so as to ensure the safe operation of the unit.

Specifically, as shown in fig. 4, the holding ring 23 provided in this embodiment includes a holding ring inner ring 231 and a holding ring outer ring 232, the holding ring inner ring 231 and the holding ring outer ring 232 are integrally connected, and the holding ring inner ring 231 and the holding ring outer ring 232 provided in this embodiment are directly machined on the same steel body; a fixing groove 25 for installing the thrust pad 24 and a holding ring inner wall 233 for assembling the cam linkage mechanism 3 are formed between the holding ring inner ring 231 and the holding ring outer ring 232, and the fixing groove 25 is used for preventing the thrust pad 24 from loosening from the shaft body and limiting the thrust pad 24; further, the thrust pad 24 is a fan-shaped structure, which includes a large end and a small end integrally connected with the large end, and the fixing groove 25 is opened on the holding ring outer ring 232 for fixing the large end of the thrust pad 24 and limiting the thrust pad 24 from moving along the circumferential direction.

The cam linkage mechanism 3 is positioned in the inner wall 233 of the holding ring on the back of the thrust pad 24 and comprises 10 cam blocks 31 and 10 linkage blocks 32 which are arranged corresponding to the thrust pad 24, the cam blocks 31 and the linkage blocks 32 are arranged in a mutually staggered manner, the cam blocks 31 are positioned on one side of the linkage blocks 32 away from the circle center of the holding ring 23, the cam blocks 31 are provided with cam rotating shafts which are axially vertical to the holding ring 23 so as to enable the cam blocks to rotate in the inner wall 233 of the holding ring, one end of each cam block is contacted with the bottom of the thrust pad 24, and the other end of each cam block is contacted with the linkage blocks 32; the linkage block 32 is provided with a linkage rotating shaft which is perpendicular to the radial direction of the holding ring 23, so that the linkage block can swing between the inner walls 233 of the holding ring, the two swinging ends of the linkage block 32 are respectively contacted with the adjacent cam blocks 31, after one thrust pad 24 is subjected to axial thrust of a bearing, the corresponding cam block 31 is subjected to thrust of the thrust pad 24 to rotate, the linkage block 32 is synchronously driven to swing, and then the linkage block 32 drives the adjacent cam block 31 to rotate so that the adjacent thrust pad 24 reversely feeds the thrust, and the linkage of the whole circle of thrust pad 24 is realized.

In order to realize that the linkage block 32 can swing between the inner walls 233 of the holding ring, as shown in fig. 3 and 5, the linkage rotating shaft of the linkage block 32 of the embodiment is a first pin shaft 33, the first pin shaft 33 is perpendicular to the holding ring 23 in the radial direction, a pin seat 34 extending outward in the radial direction is arranged on the outer edge side wall surface of the inner ring 231 of the holding ring and used for installing the first pin shaft 33, so that the linkage block 32 can swing between the inner walls 233 of the holding ring by taking the first pin shaft 33 as a central axis, by adopting the structure, the linkage block 32 is rotatably connected to the outer edge side wall surface of the inner ring 231 of the holding ring by taking the first pin shaft 33 as the central axis, and the linkage block 32 forms transmission connection with the cam blocks 31 of which the two ends are contacted by adopting the lever principle in the inner wall 233 of; furthermore, the two side extending ends 321 of the linkage block 32 are symmetrically arranged about the first pin shaft 33, and the arc-shaped end surfaces 322 formed at the end parts of the two side extending ends 321 are in contact with the cam block 31, so that the acting force is uniformly and stably transmitted.

To realize that the cam block 31 can rotate between the inner walls 233 of the retainer rings, please refer to fig. 3 and 6, the cam rotating shaft of the cam block 31 of this embodiment is a second pin shaft 35, the second pin shaft 35 is axially perpendicular to the retainer ring 23, and an inner groove 26 for mounting the second pin shaft 35 is formed on the inner side wall surface of the outer ring 232 of the retainer ring, so that the cam block 31 can rotate between the inner walls 233 of the retainer ring by using the second pin shaft 35 as a central axis; by adopting the structure, the structure of the holding ring 23 and the structure of the cam linkage mechanism 3 are designed compactly, each thrust pad 24 is subjected to self-adaptive adjustment on stress through the cam linkage mechanism 3, stress transmission is uniform and stable, and finally the characteristic of balanced stress of each thrust pad is achieved.

Specifically, please refer to fig. 6 and 7, the cam block 31 uses the second pin shaft 35 as a central axis and has an upper outer extension end 311 and a lower outer extension end 312, so that the thrust pad 24 contacts with the upper surface of the upper outer extension end 311 of the cam block 31, and the linkage block 32 contacts with the upper surface of the lower outer extension end 312.

The principle that the sliding thrust bearing realizes uniform load distribution among the tiles is as follows:

referring to fig. 8, taking the example that the entire circle of thrust pads 24 includes 5 thrust pads 24A and 5 thrust pads 24B, the thrust pads 24A and the thrust pads 24B are arranged in a staggered manner, when the thrust pad a directly above receives an axial thrust, it will move backward (i.e. it is forced to retreat in the direction of Y1) and act on the upper outer extension 311 of the corresponding cam block 31, due to the structural characteristics of the cam block 31, it will rotate counterclockwise (from left to right according to the cam block 31 directly above in fig. 8) around the pin shaft two 35, at the same time, the lower end 312 of the cam block 31 will make one end of the link block 32 swing downward, due to the structural characteristics of the link block 32, its other end will swing upward and act on the cam block 31 cooperating with the thrust pad B, so that the upper outer extension 311 of the cam block 31 rotates upward, and the thrust pad B is forced to feed forward (i.e. it is forced to move forward in the direction of Y2), the acting force on the thrust pad A is shared until the acting forces of the thrust pad A and the thrust pad B are equivalent, so that the cam linkage mechanism 3 consisting of the cam block 31 and the swinging block and the thrust pad 24 are stressed to be balanced respectively. Because the cam blocks 31 on the back of the whole circle of thrust pads 24 are connected together through the linkage blocks 32, during the working period of the sliding thrust bearing, each thrust pad 24 can adaptively adjust the stress through the cam linkage mechanism 3 consisting of the cam blocks 31 and the linkage blocks 32, the adverse factors of spherical surface matching are avoided, the uniform load distribution among the pads is well realized, and finally the characteristic of balanced stress among the pads is achieved.

In summary, in the sliding thrust bearing of the present embodiment, for the technical problem of unbalanced stress between the pads, the cam linkage mechanism 3 composed of the cam block 31 and the linkage block 32 arranged between the inner walls of the retaining rings 233 is adopted to cooperate and link with the pads, so that the pads are adaptively adjusted for stress through the cam linkage mechanism 3, while avoiding the adverse factors of spherical surface cooperation, the uniform load distribution between the pads can be well realized, and finally the characteristic of balanced stress between the pads is achieved, and the structural design is ingenious and reasonable; meanwhile, the thrust pad component 2 is simple in structure and manufacture, high in assembly speed, capable of meeting the requirements of high reliability and stability during the operation of equipment, and capable of meeting the requirement of high load of the thrust bearing of the existing steam turbine, is a novel sliding bearing structure for realizing load uniform distribution among pads through cam linkage, the sliding thrust bearing does not have abnormal conditions during the whole practical operation process, the temperature of the whole bearing pad is normal, the reasonability and the safety of the novel sliding bearing for realizing the load uniform distribution among pads through cam linkage are actually verified, the maintenance period of the power generation equipment can be greatly increased, the operation maintenance cost is reduced, the thrust pad component has a good application prospect, and the thrust pad component is good in popularization and use value in the technical fields of large rotating machinery such as thermal power, nuclear power, gas turbines and industrial turbines, and the like, and is suitable for.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a realize slip thrust bearing of load equipartition between tile with cam linkage which characterized in that: the bearing bush comprises a bearing bush sleeve, wherein the bearing bush sleeve is of a hollow annular structure, and an installation groove is formed in the annular structure;

2. The sliding thrust bearing for realizing load uniform distribution among pads through cam linkage according to claim 1, is characterized in that: the holding ring comprises a holding ring inner ring and a holding ring outer ring, and a fixing groove for mounting the thrust pad and a space between the inner walls of the holding ring for assembling the cam linkage mechanism are formed between the holding ring inner ring and the holding ring outer ring.

3. The sliding thrust bearing for realizing load uniform distribution among pads through cam linkage according to claim 2, is characterized in that: the thrust pad is fan-shaped structure, and it includes the main aspects and is the tip of an organic whole connection with the main aspects, the fixed slot is seted up and is being in on the ring outer lane holds for restrict the thrust pad and play along circumference.

4. The sliding thrust bearing for realizing load uniform distribution among pads through cam linkage according to claim 2, is characterized in that: the linkage rotating shaft configured on the linkage block is a first pin shaft, the first pin shaft is perpendicular to the radial direction of the holding ring, and a pin seat extending outwards along the radial direction of the first pin shaft is arranged on the side wall surface of the outer edge of the inner ring of the holding ring and used for installing the first pin shaft, so that the linkage block can swing between the inner walls of the holding ring by taking the first pin shaft as a central shaft.

5. The sliding thrust bearing for realizing load uniform distribution among pads through cam linkage according to claim 4, is characterized in that: the two side extending ends of the linkage block are symmetrically arranged relative to the first pin shaft, and arc-shaped end faces formed by the end portions of the two side extending ends are in contact with the cam block.

6. The sliding thrust bearing for realizing load uniform distribution among pads through cam linkage according to claim 2, is characterized in that: the cam rotating shaft configured on the cam block is a second pin shaft, the second pin shaft is axially vertical to the holding ring, and an inner groove for mounting the second pin shaft is formed in the side wall surface of the inner edge of the outer ring of the holding ring, so that the cam block can rotate between the inner wall of the holding ring by taking the second pin shaft as a central shaft.

7. The sliding thrust bearing for realizing load uniform distribution among pads through cam linkage according to claim 6, is characterized in that: the cam block takes the second pin shaft as a central shaft and is provided with an upper external extending end and a lower external extending end, so that the thrust pad is in contact with the upper surface of the upper external extending end of the cam block, and the linkage block is in contact with the upper surface of the lower external extending end.

8. The sliding thrust bearing for achieving load uniform distribution among pads through cam linkage according to any one of claims 1 to 7, wherein: the thrust tile subassembly in the axle bush cover is including two, and two thrust tile subassemblies are and set up side by side, and the annular end face that two thrust tile subassemblies have thrust tile piece one side is the setting in opposite directions.

9. The sliding thrust bearing for achieving load uniform distribution among pads through cam linkage according to claim 8, wherein: each thrust pad assembly includes 8-10 thrust pads.

10. The sliding thrust bearing for achieving load uniform distribution among pads through cam linkage according to claim 8, wherein: the bearing bush sleeve comprises an upper half shaft bush sleeve and a lower half shaft bush sleeve, and the upper half shaft bush sleeve and the lower half shaft bush sleeve are connected through a bolt on a matching surface of the upper half shaft bush sleeve and the lower half shaft bush sleeve.