Series thrust bearing rigidity detection method
By attaching strain gauge on key components of series thrust bearings, combining the load and strain gauge loading of presses and reading data, calculating the load and deformation amount of each bearing part, the problem of difficulty in detecting the axial stiffness of bearings in the prior art is solved, and accurate detection of the stiffness of each bearing part and load distribution analysis is achieved.
Patent Information
- Application Number
- CN202411624718.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-08-07
- Filing Date
- 2024-11-14
- Publication Date
- 2025-02-28
AI Technical Summary
The prior art is difficult to effectively detect the axial stiffness of multi-layer series thrust bearings, which affects the design and use of bearings.
A series thrust bearing stiffness detection method is adopted. By uniformly attaching strain gauge on the inner sleeve, outer sleeve, inner spacer, outer spacer and shaft ring, assembled into a bearing, and loading the load using a press, reading the strain value through the strain gauge, calculating the load and deformation of the parts, and then calculating the stiffness of each part.
The accurate detection of the whole series thrust bearing and the stiffness of each part is achieved, and it can be obtained whether the load distribution of each part of the bearing is reasonable, which is simple to operate and easy to calculate.
Smart Images
Figure CN119533934A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rolling bearing measurement methods, and in particular to a tandem thrust bearing stiffness detection method. Background Art
[0002] A tandem thrust bearing is a type of thrust bearing that can withstand large axial loads. Since the bearing adopts a multi-layer tandem structure, the control of the axial deformation of the bearing becomes very critical. In order to verify whether the axial stiffness of the bearing meets the design requirements, this detection method was invented. Summary of the invention
[0003] The present invention aims to overcome the above technical defects and provides a method for detecting the stiffness of a tandem thrust bearing, which can detect the axial stiffness of a multi-layer tandem thrust bearing.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a method for detecting the stiffness of a tandem thrust bearing, comprising an inner sleeve, an outer sleeve, a plurality of inner spacers, a plurality of outer spacers, a plurality of seat rings and a plurality of shaft rings, comprising the following steps: Step 1: Evenly attach three strain gauges on the inner diameter circumference of the inner sleeve, and evenly attach three strain gauges on the outer diameter circumference of the outer sleeve; Step 2: Evenly attach three strain gauges on the inner diameter circumference of each inner spacer ring; Step 3: Evenly attach three strain gauges on the outer diameter circumference of each outer spacer ring; Step 4: Assemble the inner sleeve, the outer sleeve, a plurality of inner spacers, a plurality of outer spacers, a plurality of seat rings, a plurality of shaft rings and other bearing parts into a bearing; Step 5: Place the assembled bearing vertically, and place a micrometer on the top of the shaft ring farthest from the ground; Step 6: Calculate the overall stiffness of the bearing; Step 7: Calculate the stiffness of each component.
[0005] Furthermore, in step six, a press is used to load the bearing vertically downward, and the value of the micrometer is read when the load reaches the maximum load, and the test is performed three times to obtain an average value.
[0006] Furthermore, the tandem thrust bearing has at least three layers.
[0007] Furthermore, the tandem thrust bearing has 8 layers.
[0008] Further, the inner sleeve includes a first inner sleeve and a second inner sleeve; The inner spacer includes a first inner spacer, a second inner spacer, a third inner spacer, a fourth inner spacer, a fifth inner spacer, a sixth inner spacer, a seventh inner spacer, and an eighth inner spacer; The outer spacer includes a first outer spacer, a second outer spacer, a third outer spacer, a fourth outer spacer, a fifth outer spacer, and a sixth outer spacer.
[0009] Further, in step seven, the bearing is divided into an upper half-string bearing and a lower half-string bearing, and the first inner sleeve, the first inner spacer, the second inner spacer, the third inner spacer, the fourth inner spacer, the first outer spacer, the second outer spacer, and the third outer spacer are located in the upper half-string bearing; the outer sleeve, the second inner sleeve, the fifth inner spacer, the sixth inner spacer, the seventh inner spacer, the eighth inner spacer, the fourth outer spacer, the fifth outer spacer, and the sixth outer spacer are located in the lower half-string bearing; The second inner sleeve is not subjected to force, the first inner sleeve and the lower half of the bearing are subjected to the same force; the outer sleeve and the upper half of the bearing are subjected to the same force.
[0010] Furthermore, in step seven, if a load of M kN is applied above the bearing, that is, the first inner sleeve and the lower half of the bearing are both subjected to a load of 1 / 2M kN, and the outer sleeve and the lower half of the bearing are both subjected to a load of 1 / 2M kN; The first inner spacer, the fifth inner spacer, the third outer spacer and the sixth outer spacer all bear a load of 3 / 8M kN; The second inner spacer, the sixth inner spacer, the second outer spacer, and the fifth outer spacer all bear a load of 1 / 4M kN; The third inner spacer, the seventh inner spacer, the first outer spacer and the fourth outer spacer all bear a load of 1 / 8M kN; the fourth inner spacer and the eighth inner spacer are not subjected to force.
[0011] Furthermore, in step seven, the strain values of the first inner sleeve, the outer sleeve, each inner spacer and each outer spacer are read by strain gauges, the deformation is calculated by the ratio relationship, and finally the part stiffness is calculated by the ratio of the load borne by the part to the deformation of the part.
[0012] Furthermore, in step seven, the loads of the parts of the upper half of the bearing and the lower half of the bearing are calculated respectively: Calculation method of the stiffness of each part of the upper half of the bearing: Assume that the strain gauge readings of the following parts are: the first inner spacer is a, the second inner spacer is b, the third inner spacer is c, the first outer spacer is d, the second outer spacer is e, the third outer spacer is f, and the first inner sleeve is g; Therefore, the deformation of the first inner spacer = Xa / (a+b+c+d+e+f+g); The deformation of the second inner spacer = Xb / (a+b+c+d+e+f+g); The deformation of the third inner spacer = Xc / (a+b+c+d+e+f+g); The deformation of the first outer spacer = Xd / (a+b+c+d+e+f+g); The deformation of the second outer spacer = Xe / (a+b+c+d+e+f+g); The deformation of the third outer spacer = Xf / (a+b+c+d+e+f+g); Then the stiffness of the first inner spacer is 3 / 8M kN / deformation of the first inner spacer; Then the stiffness of the second inner spacer is 1 / 4M kN / deformation of the second inner spacer; Then the stiffness of the third inner spacer is 1 / 8M kN / deformation of the third inner spacer; Then the stiffness of the first outer spacer is 1 / 8M kN / deformation of the first outer spacer; Then the stiffness of the second outer spacer is 1 / 4M kN / deformation of the second outer spacer; Then the stiffness of the third outer spacer is 3 / 8M kN / deformation of the third outer spacer; The calculation method for the stiffness of each part of the lower half bearing is the same as that for the upper half bearing.
[0013] Furthermore, the other bearing components include a cage cover, a cage seat, rollers and elastic cylindrical pins.
[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention can not only calculate the overall stiffness of the tandem thrust bearing through the strain gauge, but also calculate the stiffness of each component of the tandem thrust bearing through the strain gauge, so it can be obtained through calculation whether the load distribution of each component of the tandem thrust bearing is reasonable, the operation process is convenient, and the calculation is simple.
[0015] On the other hand, the present invention provides a tandem thrust bearing, which comprises an upper half bearing and a lower half bearing arranged in series; the upper half bearing comprises a first inner sleeve, a plurality of bearing assemblies arranged in series on the first inner sleeve, a first shaft ring arranged at one end of the first inner sleeve, and a sixth shaft ring arranged at the other end of the first inner sleeve; The lower half bearing includes a second inner sleeve, a plurality of bearing assemblies arranged in series on the second inner sleeve, an outer sleeve, a first race arranged at one end of the outer sleeve, and a sixth race arranged at the other end of the outer sleeve; Each bearing assembly includes a seat ring, a shaft ring sleeved on the first inner sleeve, and a roller disposed between the seat ring and the shaft ring; An outer spacer is provided between the seat rings of adjacent bearing assemblies in the upper half of the bearing series, and an inner spacer is provided between the shaft rings of adjacent bearing assemblies; An outer spacer is arranged between the seat rings of adjacent bearing assemblies in the lower half of the bearing series, and an inner spacer is arranged between the shaft rings of adjacent bearing assemblies. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] in: Figure 1 This is the structural diagram of the tandem thrust bearing; Figure 2 It is the structural diagram of two-stage tandem thrust cylindrical roller bearing; Figure 3 It is a schematic diagram of the appearance of a two-stage tandem thrust cylindrical roller bearing; Figure 4 It is a side view of a two-stage tandem thrust cylindrical roller bearing; Figure 5 for Figure 2 A partial enlarged view of part I; Figure 6 is a schematic structural diagram of the first inner spacer; In the figure: 09 is an elastic cylindrical pin; 16 is a first cage cover; 76 is a second cage cover; 06 is a first cage seat; 46 is a second cage seat; 04 is a first set of rollers; 24 is a second set of rollers; GH0 is the outer sleeve; WH is the first inner sleeve; WH0 is the second inner sleeve; GR1 is the first outer spacer; GR2 is the second outer spacer; GR3 is the third outer spacer; GR01 is the fourth outer spacer; GR02 is the fifth outer spacer; GR03 is the sixth outer spacer; WR1 is the first inner spacer; WR2 is the second inner spacer; WR3 is the third inner spacer; WR4 is the fourth inner spacer; WR01 is the fifth inner spacer; WR02 is the sixth inner spacer; WR03 is the seventh inner spacer; WR04 is the eighth inner spacer; GS is the first seat ring; GS1 is the second seat ring; GS2 is the third seat ring; GS3 is the fourth seat ring; GS4 is the fifth seat ring; GS0 is the sixth seat ring; GS01 is the seventh seat ring; GS02 is the eighth seat ring; GS03 is the ninth seat ring; GS04 is the tenth seat ring; WS is the first shaft ring; WS1 is the second shaft ring; WS2 is the third shaft ring; WS3 is the fourth shaft ring; WS4 is the fifth shaft ring; WS0 is the sixth shaft ring; WS01 is the seventh shaft ring; WS02 is the eighth shaft ring; WS03 is the ninth shaft ring; WS04 is the tenth shaft ring; WR1-01 is the first boss, and WR1-02 is the second boss. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0019] Tandem thrust cylindrical roller bearings are a new type of thrust bearing group with small radial dimensions and large axial load-bearing capacity. They are generally used in gearboxes of important chemical and light industrial extrusion granulation machines. With the development of society, the requirements of host manufacturers for equipment performance are getting higher and higher, so it is necessary to develop large-scale tandem thrust cylindrical roller bearing groups with higher load-bearing capacity and longer life. Due to the limited distance between the two shafts of the extruder, in order to increase the load on the bearing, it is necessary to increase the number of bearing strings. As the number of strings increases, the wall thickness of the inner and outer spacers responsible for load transmission and distribution will decrease exponentially, which will lead to a decrease in the strength of the inner and outer spacers, increase the difficulty of product processing, and even make it impossible to have process feasibility. It is necessary to develop bearings with new structures.
[0020] In order to distribute the axial load to each series of bearings in a certain proportion, an embodiment of the present invention provides a series thrust bearing, which can meet the installation and use requirements of the high-torque co-directional parallel twin-screw gearbox of a large extrusion granulator gearbox. The bearing group is composed of multiple shaft rings, seat rings, inner spacers, outer spacers, rollers, retainers, inner sleeves and outer sleeves. Its working principle is to distribute the axial load to each series of thrust cylindrical roller bearings through spacers and sleeves, thereby improving the load-bearing capacity of the entire set of bearings.
[0021] See also Figure 2-Figure 6 A tandem thrust bearing is composed of two-stage tandem thrust cylindrical roller bearing groups. Specifically, it includes an upper half-tandem bearing and a lower half-tandem bearing arranged in series; wherein the upper half-tandem bearing includes a first inner sleeve WH, a plurality of bearing assemblies arranged in series on the first inner sleeve WH, a first shaft ring WS arranged at one end of the first inner sleeve WH, and a sixth shaft ring WS0 arranged at the other end of the first inner sleeve WH; The lower half bearing includes a second inner sleeve WH0, a plurality of bearing assemblies arranged in series on the second inner sleeve WH0, an outer sleeve GH0, a first race GS arranged at one end of the outer sleeve GH0, and a sixth race GS0 arranged at the other end of the outer sleeve GH0; Each bearing assembly includes a seat ring, a shaft ring sleeved on the first inner sleeve, and a roller disposed between the seat ring and the shaft ring; An outer spacer is provided between the seat rings of adjacent bearing assemblies in the upper half of the bearing series, and an inner spacer is provided between the shaft rings of adjacent bearing assemblies; An outer spacer is arranged between the seat rings of adjacent bearing assemblies in the lower half of the bearing series, and an inner spacer is arranged between the shaft rings of adjacent bearing assemblies.
[0022] In this embodiment, the upper half of the bearing string includes four bearing assemblies, and the lower half of the bearing string includes four bearing assemblies.
[0023] Continue to see Figure 1 For the upper half of the bearing series, the sixth shaft ring WS0 is arranged at one end of the first inner shaft sleeve WH, the first shaft ring WS is arranged at the other end of the first inner shaft sleeve WH, and the fourth inner spacer ring WR4, the fourth shaft ring WS3, the third inner spacer ring WR3, the fourth shaft ring WS3, the second inner spacer ring WR2, the third shaft ring WS2, the first inner spacer ring WR1, and the first shaft ring WS are arranged on the outer side of the first inner shaft sleeve WH from bottom to top. The fifth seat ring GS4, the third outer spacer ring GR3, the fourth seat ring GS3, the second outer spacer ring GR2, the third seat ring GS2, the first outer spacer ring GR1 and the second seat ring GS1 are arranged above the first seat ring GS of the lower half of the bearing series from bottom to top; rollers are arranged between adjacent seat rings and shaft rings.
[0024] Specifically, see Figure 1 The first race GS is arranged at one end of the outer sleeve GH0, the sixth race GS0 is arranged at the other end of the outer sleeve GH0, and the tenth race GS04, the third outer spacer GR3, the ninth race GS03, the fifth outer spacer GR02, the eighth race GS02, the fourth outer spacer GR01 and the seventh race GS01 are arranged in sequence between the sixth race GS0 and the first race GS. The eighth inner spacer WR04, the tenth shaft ring WS04, the seventh inner spacer WR03, the ninth shaft ring WS03, the sixth inner spacer WR02, the eighth shaft ring WS02, the fifth inner spacer WR01 and the seventh shaft ring WS01 are arranged from bottom to top on the second inner sleeve WH0; rollers are arranged between adjacent races and shaft rings.
[0025] The above-mentioned tandem thrust bearing distributes the axial load to each series of thrust cylindrical roller bearings through the spacer and the sleeve, thereby improving the load-bearing capacity of the entire set of bearings. The inner diameter of the bearing matches the shaft, and the outer diameter of the bearing matches the housing. The axial load is applied to the shaft ring and is limited by the seat ring. The external axial load is distributed to the first and second series of thrust cylindrical roller bearing groups in a certain proportion through the stiffness matching of the first inner sleeve WH and the outer sleeve GH0 between the two-stage tandem thrust cylindrical roller bearing groups. Each stage of the tandem thrust cylindrical roller bearing group is composed of four series of thrust cylindrical roller bearings with the same load-bearing capacity. The external axial force is evenly distributed on each series of thrust cylindrical roller bearings through the stiffness matching of the inner spacers WR1~WR3, WR01~WR03 and the outer spacers GR1~GR3, GR01~GR03 between each series of thrust cylindrical roller bearings.
[0026] See also Figure 5 In one embodiment, a gap δ is provided between the eighth inner spacer ring WR04 and the sixth shaft ring WS0, and the gap δ is set to 1 mm to 2 mm. Such a setting can prevent the eighth inner spacer ring WR04 from bearing load and avoid affecting the force transmission route of the entire bearing.
[0027] See also Figure 6 In one embodiment, a first boss and a second boss are respectively provided on both sides of the outer diameter of the first inner spacer WR1, and the outer diameters of the first boss WR1-01 and the second boss WR1-02 are both used to cooperate with the external housing. In this way, stress can be transmitted to the external housing through the first boss WR1-01 and the second boss WR1-02 to disperse the stress, further improving the load-bearing capacity of the entire bearing.
[0028] Further, a first inclined surface is provided on one side of the first boss WR1-01 close to the second boss WR1-02, and a second inclined surface is provided on one side of the second boss close to the first boss WR1-01, and the angle between the first inclined surface and the second inclined surface is α. In the specific setting, in this embodiment, α is 60°.
[0029] Preferably, the first boss WR1-01 has a first inclined surface and the root of one side is set as an R-rounded corner, and the second boss WR1-02 has a second inclined surface and the root of one side is set as an R-rounded corner, which can effectively avoid stress concentration at the right-angle root.
[0030] Furthermore, in one embodiment, protrusions with a width of S are provided at both ends of the first inner spacer ring WR1 to facilitate grinding and adjustment of fine dimensions after the bearing test.
[0031] In some embodiments, the second inner spacer WR2, the third inner spacer WR3, the fourth inner spacer WR4, the fifth inner spacer WR01, the sixth inner spacer WR02, the seventh inner spacer WR03, and the eighth inner spacer WR04 have the same structure as the first inner spacer WR1.
[0032] like Figure 1 As shown, a method for detecting stiffness of a tandem thrust bearing comprises an inner sleeve, an outer sleeve GH0, a plurality of inner spacers, a plurality of outer spacers, a plurality of seat rings and a plurality of shaft rings, comprising the following steps: Step 1: Evenly attach three strain gauges on the inner diameter circumference of the inner sleeve, and evenly attach three strain gauges on the outer diameter circumference of the outer sleeve GH0; Step 2: Evenly attach three strain gauges on the inner diameter circumference of each inner spacer ring; Step 3: Evenly attach three strain gauges on the outer diameter circumference of each outer spacer ring; Step 4: Assemble the inner sleeve, the outer sleeve GH0, a plurality of inner spacers, a plurality of outer spacers, a plurality of seat rings, a plurality of shaft rings and other bearing parts into a bearing; Step 5: Place the assembled bearing vertically, and place a micrometer on the top of the shaft ring farthest from the ground; Step 6: Calculate the overall stiffness of the bearing; Step 7: Calculate the stiffness of each component.
[0033] Furthermore, in step six, a press is used to load the bearing vertically downward, and the value of the micrometer is read when the load reaches the maximum load, and the test is performed three times to obtain an average value.
[0034] Furthermore, the tandem thrust bearing has at least three layers.
[0035] Furthermore, the tandem thrust bearing has 8 layers.
[0036] Further, the inner sleeve comprises a first inner sleeve WH and a second inner sleeve WH0; The inner spacer rings include a first inner spacer ring WR1, a second inner spacer ring WR2, a third inner spacer ring WR3, a fourth inner spacer ring WR4, a fifth inner spacer ring WR01, a sixth inner spacer ring WR02, a seventh inner spacer ring WR03, and an eighth inner spacer ring WR04; The outer spacer rings include a first outer spacer ring GR1, a second outer spacer ring GR2, a third outer spacer ring GR3, a fourth outer spacer ring GR01, a fifth outer spacer ring GR02, and a sixth outer spacer ring GR03.
[0037] Further, in step seven, the bearing is divided into an upper half-string bearing and a lower half-string bearing, and the first inner sleeve WH, the first inner spacer WR1, the second inner spacer WR2, the third inner spacer WR3, the fourth inner spacer WR4, the first outer spacer GR1, the second outer spacer GR2, and the third outer spacer GR3 are located in the upper half-string bearing; the outer sleeve GH0, the second inner sleeve WH0, the fifth inner spacer WR01, the sixth inner spacer WR02, the seventh inner spacer WR03, the eighth inner spacer WR04, the fourth outer spacer GR01, the fifth outer spacer GR02, and the sixth outer spacer GR03 are located in the lower half-string bearing; The second inner sleeve WH0 is not subjected to force, the first inner sleeve WH and the lower half of the bearing are subjected to the same force; the outer sleeve GH0 and the upper half of the bearing are subjected to the same force.
[0038] Furthermore, in step seven, if a load of M kN is applied above the bearing, that is, the first inner sleeve WH and the lower half of the bearing are subjected to a load of 1 / 2M kN, and the outer sleeve WH0 and the lower half of the bearing are subjected to a load of 1 / 2M kN; The first inner spacer WR1, the fifth inner spacer WR01, the third outer spacer GR3, and the sixth outer spacer GR03 all bear a load of 3 / 8M kN; The second inner spacer WR2, the sixth inner spacer WR02, the second outer spacer GR2, and the fifth outer spacer GR02 all bear a load of 1 / 4M kN; The third inner spacer ring WR3, the seventh inner spacer ring WR03, the first outer spacer ring GR1 and the fourth outer spacer ring GR01 all bear a load of 1 / 8M kN; the fourth inner spacer ring WR4 and the eighth inner spacer ring WR04 are not subjected to force.
[0039] Furthermore, in step seven, the strain values of the first inner sleeve WH, the outer sleeve GH0, each inner spacer and each outer spacer are read by strain gauges, the deformation is calculated through the ratio relationship, and finally the part stiffness is calculated through the ratio of the load borne by the part to the deformation of the part.
[0040] Furthermore, in step seven, the loads of the parts of the upper half of the bearing and the lower half of the bearing are calculated respectively: Calculation method of the stiffness of each part of the upper half of the bearing: Assume that the strain gauge readings of the following parts are: first inner spacer WR1=a, second inner spacer WR2=b, third inner spacer WR3=c, first outer spacer GR1=d, second outer spacer GR2=e, third outer spacer GR3=f, first inner sleeve WH=g; Therefore, the deformation of the first inner spacer ring WR1 = Xa / (a+b+c+d+e+f+g); The deformation of the second inner spacer ring WR2 = Xb / (a+b+c+d+e+f+g); The deformation of the third inner spacer ring WR3 = Xc / (a+b+c+d+e+f+g); The deformation of the first outer spacer ring GR1 = Xd / (a+b+c+d+e+f+g); The deformation of the second outer spacer ring GR2 = Xe / (a+b+c+d+e+f+g); The deformation of the third outer spacer ring GR3 = Xf / (a+b+c+d+e+f+g); Then the stiffness of the first inner spacer ring WR1 is 3 / 8M kN / deformation of the first inner spacer ring WR1; Then the stiffness of the second inner spacer WR2 is 1 / 4M kN / deformation of the second inner spacer WR2; Then the stiffness of the third inner spacer ring WR3 is 1 / 8M kN / deformation of the third inner spacer ring WR3; Then the stiffness of the first outer spacer GR1 is 1 / 8M kN / deformation of the first outer spacer GR1; Then the stiffness of the second outer spacer GR2 is 1 / 4M kN / deformation of the second outer spacer GR2; Then the stiffness of the third outer spacer GR3 is 3 / 8M kN / deformation of the third outer spacer GR3; The calculation method for the stiffness of each part of the lower half bearing is the same as that for the upper half bearing.
[0041] Furthermore, the other bearing components include a cage cover, a cage seat, rollers and elastic cylindrical pins.
[0042] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0043] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0044] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.
Claims
1. A method for detecting stiffness of a tandem thrust bearing, comprising an inner sleeve, an outer sleeve, a plurality of inner spacers, a plurality of outer spacers, a plurality of seat rings and a plurality of shaft rings, characterized in that: The following steps are involved: Step 1: Evenly attach three strain gauges on the inner diameter circumference of the inner sleeve, and evenly attach three strain gauges on the outer diameter circumference of the outer sleeve; Step 2: Evenly attach three strain gauges on the inner diameter circumference of each inner spacer ring; Step 3: Evenly attach three strain gauges on the outer diameter circumference of each outer spacer ring; Step 4: Assemble the inner sleeve, the outer sleeve, a plurality of inner spacers, a plurality of outer spacers, a plurality of seat rings, a plurality of shaft rings and other bearing parts into a bearing; Step 5: Place the assembled bearing vertically, and place a micrometer on the top of the shaft ring farthest from the ground; Step 6: Calculate the overall stiffness of the bearing; Step 7: Calculate the stiffness of each component.
2. A method for detecting stiffness of a tandem thrust bearing according to claim 1, characterized in that: In step six, a press is used to load the bearing vertically downward, and the value of the micrometer is read when the load reaches the maximum load. The test is performed three times and the average value is taken.
3. A method for detecting stiffness of a tandem thrust bearing according to claim 1, characterized in that: The tandem thrust bearing has at least three layers.
4. A method for detecting stiffness of a tandem thrust bearing according to claim 1, characterized in that: The tandem thrust bearing has 8 layers.
5. A method for detecting stiffness of a tandem thrust bearing according to claim 4, characterized in that: The inner sleeve comprises a first inner sleeve and a second inner sleeve; The inner spacer includes a first inner spacer, a second inner spacer, a third inner spacer, a fourth inner spacer, a fifth inner spacer, a sixth inner spacer, a seventh inner spacer, and an eighth inner spacer; The outer spacer includes a first outer spacer, a second outer spacer, a third outer spacer, a fourth outer spacer, a fifth outer spacer, and a sixth outer spacer.
6. A method for detecting stiffness of a tandem thrust bearing according to claim 5, characterized in that: In the step 7, the bearing is divided into an upper half-string bearing and a lower half-string bearing, the first inner sleeve, the first inner spacer, the second inner spacer, the third inner spacer, the fourth inner spacer, the first outer spacer, the second outer spacer, and the third outer spacer are located in the upper half-string bearing; the outer sleeve, the second inner sleeve, the fifth inner spacer, the sixth inner spacer, the seventh inner spacer, the eighth inner spacer, the fourth outer spacer, the fifth outer spacer, and the sixth outer spacer are located in the lower half-string bearing; The second inner sleeve is not subjected to force, the first inner sleeve and the lower half of the bearing are subjected to the same force; the outer sleeve and the upper half of the bearing are subjected to the same force.
7. A method for detecting stiffness of a tandem thrust bearing according to claim 6, characterized in that: In the step 7, if a load of M kN is applied above the bearing, that is, the first inner sleeve and the lower half of the bearing are both subjected to a load of 1 / 2M kN, and the outer sleeve and the lower half of the bearing are both subjected to a load of 1 / 2M kN; The first inner spacer, the fifth inner spacer, the third outer spacer and the sixth outer spacer all bear a load of 3 / 8M kN; The second inner spacer, the sixth inner spacer, the second outer spacer, and the fifth outer spacer all bear a load of 1 / 4M kN; The third inner spacer, the seventh inner spacer, the first outer spacer and the fourth outer spacer all bear a load of 1 / 8M kN; the fourth inner spacer and the eighth inner spacer are not subjected to force.
8. A method for detecting stiffness of a tandem thrust bearing according to claim 7, characterized in that: In step seven, the strain values of the first inner sleeve, the outer sleeve, each inner spacer and each outer spacer are read by strain gauges, the deformation is calculated by the ratio relationship, and finally the part stiffness is calculated by the ratio of the load borne by the part to the deformation of the part.
9. A method for detecting stiffness of a tandem thrust bearing according to claim 1, characterized in that: The other bearing components include a cage cover, a cage seat, rollers and elastic cylindrical pins.
10. A tandem thrust bearing, characterized in that: include An upper half bearing and a lower half bearing are arranged in series; the upper half bearing comprises a first inner sleeve, a plurality of bearing assemblies arranged in series on the first inner sleeve, a first shaft ring arranged at one end of the first inner sleeve, and a sixth shaft ring arranged at the other end of the first inner sleeve; The lower half bearing includes a second inner sleeve, a plurality of bearing assemblies arranged in series on the second inner sleeve, an outer sleeve, a first race arranged at one end of the outer sleeve, and a sixth race arranged at the other end of the outer sleeve; Each bearing assembly includes a seat ring, a shaft ring sleeved on the first inner sleeve, and a roller disposed between the seat ring and the shaft ring; An outer spacer is arranged between the seat rings of adjacent bearing assemblies in the upper half of the bearing series, and an inner spacer is arranged between the shaft rings of adjacent bearing assemblies; an outer spacer is arranged between the seat rings of adjacent bearing assemblies in the lower half of the bearing series, and an inner spacer is arranged between the shaft rings of adjacent bearing assemblies.