Plane-moving thrust ball bearing type test device and method

Abstract

The invention relates to a thrust ball bearing type test device and method capable of moving in a plane, the thrust ball bearing type test device comprises a measuring table, an axial loading mechanism and two lower bearing assemblies of thrust ball bearings, the two lower bearing assemblies are stacked on the measuring table, and a heightening disc is arranged between the two lower bearing assemblies. A pressure sensor is arranged between the axial loading mechanism and the lower bearing assembly located at the upper end of the heightening disc. A displacement testing device and a radial loading device are arranged on the measuring table and located on the two sides of the heightening disc respectively, the displacement testing device comprises a fixing frame and a displacement sensor which is arranged on the fixing frame and abuts against the heightening disc, the radial loading device comprises a driving mechanism, and a thrust sensor facing the heightening disc is installed on the driving mechanism. The structure is simple, and the friction coefficient of the thrust ball bearing can be accurately measured.

Description

Technical Field

[0001] The invention relates to the technical field of bearing testing, and in particular to a type testing device and method for a thrust ball bearing capable of plane movement. Background Art

[0002] There is a kind of thrust ball bearing for plane movement, which is large in size, complex in structure, and has an asymmetric structure in appearance, such as Figure 1 As shown, the thrust ball bearing includes an upper bearing assembly and a lower bearing assembly, wherein the upper bearing assembly includes an upper seat assembly 1 and a transition plate protective cover assembly 2, and the lower bearing assembly includes an upper thrust plate 6, a positioning column 5, a steel ball retainer assembly 3, a lower thrust plate 7 and a base assembly 4, wherein the positioning column is assembled with the upper thrust plate, and the lower thrust plate is assembled with the base assembly. The bearing is applied to the steam-water separation reheater, which is a key equipment of the steam turbine of a nuclear power plant. The bearing is placed between the equipment saddle and the steel platform of the power plant. The upper seat assembly is connected to the equipment saddle, and the base assembly is connected to the steel platform of the power plant. The function is to bear the dead weight of the equipment and move the equipment a short distance in the horizontal direction, thereby absorbing the thermal displacement generated by the equipment and pipelines, thereby releasing part of the local stress generated by the thermal displacement and reducing the strength requirements of the equipment and pipelines. If the friction force of the bearing is too large when moving in a plane, it will cause serious damage to the host equipment. Therefore, type testing is required during the bearing manufacturing process.

[0003] Type tests need to simulate the actual working conditions of the bearings. The bearings need to move in a plane under the action of the rated gravity load, and the friction coefficient is measured by the test device. In existing tests, the above-mentioned thrust ball bearings are generally placed directly on the workbench, and the axially loaded oil cylinder is used to apply the axial rated gravity load to the bearings. Since the sliding friction between the oil cylinder pressure head and the contact surface of the upper seat assembly of the bearing is much greater than the rolling friction between the steel ball and the upper and lower thrust plate raceways, in order to push the bearing to move in a plane, the thrust must be greater than the sliding friction between the oil hydraulic press pressure head and the contact surface of the bearing upper seat assembly. This thrust is relatively large, and it is difficult for ordinary thrust devices to push the bearing to move. Even if it can be pushed, the measured thrust is not the friction of the bearing itself. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a thrust ball bearing type test device and method for plane movement.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a thrust ball bearing type test device for plane movement, comprising a measuring platform, an axial loading mechanism and two lower bearing assemblies of thrust ball bearings, the two lower bearing assemblies are stacked on the measuring platform, and the two upper thrust plates are arranged opposite to each other, a padding plate is arranged between the two lower bearing assemblies, the axial loading mechanism is used to apply axial load to the padding plate and the two lower bearing assemblies, and a pressure sensor is arranged between the axial loading mechanism and the lower bearing assembly located at the upper end of the padding plate; A displacement testing device and a radial loading device are respectively provided on both sides of the elevating disk on the measuring platform. The displacement testing device includes a fixing frame and a displacement sensor arranged on the fixing frame and in contact with the elevating disk. The radial loading device includes a driving mechanism on which a thrust sensor is installed toward the elevating disk. The driving mechanism is used to drive the thrust sensor to reciprocate radially along the elevating disk so as to apply a radial load to the elevating disk.

[0006] As a preferred solution, the axial loading mechanism includes an axial loading cylinder, which is located above the uppermost lower bearing assembly, and the pressure sensor is arranged at the end of the piston rod of the axial loading cylinder.

[0007] As a preferred solution, it also includes a pressure display instrument, a displacement display instrument and a thrust force measuring display instrument. The pressure display instrument is electrically connected to the pressure sensor, the displacement display instrument is electrically connected to the displacement sensor, and the thrust force measuring display instrument is electrically connected to the thrust sensor.

[0008] As a preferred solution, the driving mechanism includes a mounting frame and a thrust loading cylinder arranged on the mounting frame, a connecting seat is provided at the end of the piston rod of the thrust loading cylinder, and a thrust sensor is provided at the front end of the connecting seat.

[0009] As a preferred solution, floating support rods are hingedly provided on both sides of the connecting seat, and a spring is provided between the floating support rods and the outer wall of the connecting seat.

[0010] As a preferred solution, grooves cooperating with the positioning columns of the lower bearing assembly are respectively provided at the upper and lower ends of the elevation plate.

[0011] The present application also provides a test method using the above-mentioned thrust ball bearing type test device for plane movement, which is characterized by comprising the following steps: S1. Place the lower bearing assemblies of the two thrust ball shafts on the measuring table, and place the heightening plate between the two lower bearing assemblies so that the two grooves of the heightening plate are matched with the upper and lower positioning columns respectively; S2. Apply the rated gravity load to the pad plate and the two lower bearing assemblies through the axial loading mechanism, and obtain the rated gravity load Fa through the pressure display instrument; S3. Apply radial load to the pad plate through the driving mechanism until the lower bearing assembly is pushed to move in a plane, and record the value F of the thrust force display instrument when the displacement display instrument changes; S4. The friction coefficient μ of a single set of thrust ball bearings can be calculated using the formula μ=F / (2Fa).

[0012] The beneficial effects of the present application are as follows: 1. The present application places a raising plate between the two lower bearing assemblies so that the raising plate is located between the two steel ball retainer assemblies. Therefore, when the driving mechanism applies a radial load to the raising plate, the friction between the raising plate and the upper and lower lower bearing assemblies is rolling friction. Compared with the prior art, when pushing the thrust ball bearing, it is necessary to overcome the sliding friction between the upper end oil cylinder pressure head and the thrust ball bearing. In the present application, the upper and lower ends are rolling friction. The present application is easier to push the thrust ball bearing and the measurement is accurate, thereby avoiding the problem of large sliding friction between the oil cylinder pressure head and the contact surface of the thrust ball bearing when the thrust ball bearing moves in a plane after the thrust ball bearing is axially compressed, and solves the problem of the bearing being able to move in a plane after the existing thrust ball bearing is axially loaded and the accurate measurement of the bearing friction coefficient.

[0013] 2. The padding plate of the present application is provided with a groove that cooperates with the positioning column, so that when the padding plate is subjected to radial force, the upper thrust plates of the two lower bearing assemblies are driven to move simultaneously, thereby ensuring the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the thrust ball bearing structure Figure 2 It is a structural schematic diagram of the present invention; Figure 3 is a side view of the present invention; Figure 4 It is a schematic structural diagram of the thrust device of the present invention.

[0015] Markings in the figure: 1. Upper seat assembly, 2. Transition plate protective cover assembly, 3. Steel ball retainer assembly, 4. Base assembly, 5. Positioning column, 6. Upper thrust plate; 7. Lower thrust plate, 8. T-nut, 9. Bolt, 10. Displacement sensor, 11. Fixing bracket, 12. Displacement display instrument, 13. Pressure display instrument, 14. Axial loading cylinder, 15. Pressure sensor, 16. Heightening plate, 17. Thrust force measuring display instrument, 18. Spring, 19. Thrust sensor, 20. Thrust loading cylinder, 21. Mounting bracket, 22. Floating support rod. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] See also Figure 1-4 The embodiment of the present invention provides a thrust ball bearing type test device for planar movement, comprising a measuring platform, an axial loading mechanism and two lower bearing assemblies of thrust ball bearings, the two lower bearing assemblies are stacked on the measuring platform, and the two upper thrust plates 6 are arranged opposite to each other, a raised plate 16 is arranged between the two lower bearing assemblies, the axial loading mechanism is used to apply axial load to the raised plate 16 and the two lower bearing assemblies, and a pressure sensor 15 is arranged between the axial loading mechanism and the lower bearing assembly located at the upper end of the raised plate 16; a displacement test device and a radial loading device are respectively arranged on both sides of the raised plate 16 on the measuring platform, the displacement test device comprises a fixed frame 11 and a displacement sensor 10 arranged on the fixed frame 11 and in contact with the raised plate 16, the radial loading device comprises a driving mechanism, a thrust sensor 19 arranged toward the raised plate 16 is installed on the driving mechanism, and the driving mechanism is used to drive the thrust sensor 19 to move radially back and forth along the raised plate 16 to achieve the application of radial load to the raised plate 16.

[0018] Among them, combined Figure 1 As shown, the axial loading mechanism includes an axial loading cylinder 14 , which is located above the uppermost lower bearing assembly, and a pressure sensor 15 is arranged at the end of the piston rod of the axial loading cylinder 14 .

[0019] Further, combined with Figure 2 As shown, the present application further includes a pressure display instrument 13, a displacement display instrument 12 and a thrust force measuring display instrument 17. The pressure display instrument 13 is electrically connected to the pressure sensor 15, the displacement display instrument 12 is electrically connected to the displacement sensor 10, and the thrust force measuring display instrument 17 is electrically connected to the thrust sensor 19. The thrust force measuring display instrument 17 can also adopt an existing commonly used pressure display instrument, and the thrust sensor 19 can adopt an existing pressure sensor. It should be noted that the parts not described in detail in the present application are all prior art.

[0020] Among them, combined Figure 2-4 As shown, the driving mechanism includes a mounting frame 21 and a thrust loading cylinder 20 arranged on the mounting frame 21. A connecting seat is provided at the end of the piston rod of the thrust loading cylinder 20, and a thrust sensor 19 is provided at the front end of the connecting seat. Floating support rods 22 are hingedly provided on both sides of the connecting seat, and a spring 18 is provided between the floating support rod 22 and the outer wall of the connecting seat.

[0021] When in use, the inner side of the front end of the floating support rod 22 contacts the outer wall of the elevating plate 16. By providing the spring 18 and the floating support rod 22, it is convenient to align the outer diameter of the elevating plate 16 so that the thrust sensor 19 is located at the highest point of the outer diameter of the elevating plate 16, ensuring that the thrust direction is along the center of the elevating plate 16, thereby improving the accuracy of the measurement.

[0022] In addition, the fixing frame 11 and the mounting frame 21 of the present application are fixed to the measuring platform by T-nuts 8 and bolts 9, and the upper and lower ends of the pad plate 16 are respectively provided with grooves that cooperate with the positioning columns 5 of the lower bearing assembly.

[0023] The pad plate 16 of the present application is provided with a groove that cooperates with the positioning column 5, so that when the pad plate 16 is subjected to radial force, the upper thrust plates 6 of the two lower bearing assemblies are driven to move simultaneously, thereby ensuring the accuracy of the measurement. The pad plate 16 is provided to separate the two lower bearing assemblies to prevent interference between the two lower bearing assemblies during the test.

[0024] What needs to be emphasized in this application is that, when in use, this application selects the lower bearing assemblies of two sets of thrust ball bearings to participate in the test. The lower bearing assembly includes an upper thrust plate 6, a positioning column 5, a steel ball retainer assembly 3, a lower thrust plate 7 and a base assembly 4. The remaining components: an upper seat assembly 1 and a transition plate protective cover assembly 2, have no effect on the type test results of this application.

[0025] The present application also provides a test method using the above-mentioned thrust ball bearing type test device for plane movement, comprising the following steps: S1. Place the lower bearing assemblies of the two thrust ball shafts on a measuring table, and place the heightening plate 16 between the two lower bearing assemblies so that the two grooves of the heightening plate 16 are matched with the upper and lower positioning columns 5 respectively.

[0026] S2. Apply a rated gravity load to the heightening plate 16 and the two lower bearing assemblies through the axial loading mechanism, and obtain the rated gravity load Fa through the pressure display instrument 13.

[0027] S3. Apply radial load to the pad plate 16 through the driving mechanism until the lower bearing assembly is pushed to move in a plane, and record the value F of the thrust force display instrument 17 when the displacement display instrument 12 changes.

[0028] S4. The friction coefficient μ of a single set of thrust ball bearings can be calculated using the formula μ=F / (2Fa).

[0029] In step S1, add grease to each lower bearing assembly according to the test requirements, place the base assembly 4 of one set of the lower bearing assemblies upright, and then install the steel ball retainer assembly 3, the upper thrust plate 6, and the heightening plate 16 on the lower thrust plate 7 from bottom to top, and then place the other set of lower bearing assemblies on the heightening plate 16 in an inverted order; and adjust the steel ball retainer assembly 3 and the upper thrust plate 6 of each set of lower bearing assemblies to the center of their respective bearing raceways, and then place the two sets of lower bearing assemblies and the heightening plate 16 as a whole on the measuring table.

[0030] In step S3, a radial load is applied to the elevating plate 16 by the driving mechanism, and the floating support rod 22 acts on the outer wall of the elevating plate until the bearing is pushed to move in a plane. When the driving mechanism pushes the elevating plate 16, the elevating plate 16 drives the two upper thrust plates 6 to move together.

[0031] The test device of the present invention has a simple structure, flexible and convenient operation, and convenient installation and adjustment. In addition, the present application places a pad 16 between the two lower bearing assemblies so that the pad 16 is located between the two steel ball retainer assemblies 3, so that when the driving mechanism applies a radial load to the pad 16, the friction between the pad 16 and the upper and lower lower bearing assemblies is rolling friction. Compared with the prior art, when pushing the thrust ball bearing, it is necessary to overcome the sliding friction between the upper end oil cylinder pressure head and the thrust ball bearing. In the present application, the upper and lower ends are rolling friction. The present application is easier to push the thrust ball bearing and the measurement is accurate, thereby avoiding the problem of large sliding friction between the oil cylinder pressure head and the contact surface of the thrust ball bearing when the thrust ball bearing moves in a plane after the thrust ball bearing is axially compressed, and solves the problem that the existing thrust ball bearing can move in a plane after axial loading and the bearing friction coefficient can be accurately measured.

[0032] Of course, the present invention is not limited to the above-described embodiments. Several other embodiments based on the design concept of the present invention are also provided below.

[0033] For example, in other embodiments, different from the embodiments described above, the thrust loading cylinder 20 of the present application may also be an electric push rod or a servo electric cylinder.

[0034] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A thrust ball bearing type test device for plane movement, characterized in that: The apparatus comprises a measuring platform, an axial loading mechanism and two lower bearing assemblies of thrust ball bearings, wherein the two lower bearing assemblies are stacked on the measuring platform, and two upper thrust plates (6) are arranged opposite to each other, a padding plate (16) is provided between the two lower bearing assemblies, the axial loading mechanism is used to apply an axial load to the padding plate (16) and the two lower bearing assemblies, and a pressure sensor (15) is provided between the axial loading mechanism and the lower bearing assembly located at the upper end of the padding plate (16); A displacement test device and a radial loading device are respectively provided on both sides of the elevated disk (16) on the measuring platform. The displacement test device comprises a fixing frame (11) and a displacement sensor (10) arranged on the fixing frame (11) and in contact with the elevated disk (16). The radial loading device comprises a driving mechanism, on which a thrust sensor (19) is mounted and arranged toward the elevated disk (16). The driving mechanism is used to drive the thrust sensor (19) to reciprocate radially along the elevated disk (16) so as to apply a radial load to the elevated disk (16).

2. A thrust ball bearing type test device for plane movement according to claim 1, characterized in that: The axial loading mechanism comprises an axial loading cylinder (14), the axial loading cylinder (14) being located above the uppermost lower bearing assembly, and the pressure sensor (15) being arranged at the end of the piston rod of the axial loading cylinder (14).

3. A thrust ball bearing type test device for plane movement according to claim 1, characterized in that: It also includes a pressure display instrument (13), a displacement display instrument (12) and a thrust force measurement display instrument (17); the pressure display instrument (13) is electrically connected to the pressure sensor (15); the displacement display instrument (12) is electrically connected to the displacement sensor (10); and the thrust force measurement display instrument (17) is electrically connected to the thrust sensor (19).

4. A thrust ball bearing type test device for plane movement according to claim 3, characterized in that: The driving mechanism comprises a mounting frame (21) and a thrust loading cylinder (20) arranged on the mounting frame (21); a connecting seat is provided at the end of the piston rod of the thrust loading cylinder (20); and a thrust sensor (19) is provided at the front end of the connecting seat.

5. A thrust ball bearing type test device for plane movement according to claim 4, characterized in that: Floating support rods (22) are hingedly provided on both sides of the connection seat, and a spring (18) is provided between the floating support rods (22) and the outer wall of the connection seat.

6. A thrust ball bearing type test device for plane movement according to claim 5, characterized in that: The upper and lower ends of the heightening plate (16) are respectively provided with grooves that cooperate with the positioning columns (5) of the lower bearing assembly.

7. A test method using the thrust ball bearing type test device for plane movement as claimed in claim 6, characterized in that: The steps include: S1. Place the lower bearing assemblies of the two thrust ball shafts on a measuring table, and place a heightening plate (16) between the two lower bearing assemblies so that the two grooves of the heightening plate (16) are respectively matched with the upper and lower positioning columns (5); S2, applying a rated gravity load to the pad (16) and the two lower bearing assemblies through an axial loading mechanism, and obtaining the rated gravity load Fa through a pressure display instrument (13); S3, applying a radial load to the pad (16) through the driving mechanism until the lower bearing assembly is pushed to move in a plane, and recording the value F of the thrust force display instrument (17) when the displacement display instrument (12) changes; S4. The friction coefficient μ of a single set of thrust ball bearings can be calculated using the formula μ=F / (2Fa).

Images