A multi-condition turntable bearing testing machine

Abstract

A multi-condition turntable bearing testing machine, the multi-condition turntable bearing testing machine includes a frame, a rotating mechanism, a pressing block mechanism, and a downward pressing mechanism. The rotating assembly includes a test seat and a test seat cover plate. The turntable bearing is arranged in the test seat, and the test seat cover plate is arranged on the cover plate. The pressing block mechanism includes a fixing plate, a cross bar, a pressing block, a guide wheel, a rope, and a weight. The pressing block presses on the test seat cover plate. The downward pressing mechanism includes a lead screw moving device, a cylinder, a pressure sensor, and a pressing head. The output end of the cylinder passes through the top plate and the output direction is close to or away from the pressing block. The pressing head is pressed on different positions of the pressing block through the lead screw moving device and the cylinder. This increases the pressure at a point on the pressing block. When the pressure is transmitted to the turntable bearing, the wear resistance of the turntable bearing under different force positions can be detected.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing testing, and in particular to a multi-condition turntable bearing testing machine. Background Art

[0002] A turntable bearing is a large or extra-large bearing that can withstand combined loads and has a special structure. It is required to have the characteristics of compact structure, flexible rotation, convenient installation and maintenance, etc. It is widely used in the slewing devices of mechanical systems such as lifting, metallurgy, mining, construction, ports and wind power. The turntable bearing usually makes a rotary motion under heavy load conditions, and the calculation of its wear resistance and fatigue life is an important basis. Therefore, it is necessary to detect the turntable bearing. The testing devices in the prior art generally press the entire turntable bearing and then test the data of its load and wear resistance. For example, the turntable bearing rolling element load distribution testing system disclosed in the patent number CN201520474810.0. The turntable bearing drive and loading device drives the turntable bearing to rotate through a motor and a reducer, and applies radial, axial and overturning moment loads to the turntable bearing through an oil cylinder. It mainly consists of the following parts: motor 1, reducer 2, vertical plate 3, tested bearing 4, loading arm 5, axial loading oil cylinder 6 and radial loading oil cylinder 7. The loading arm 5 is conical, its large end is arranged on the tested bearing 4, and the other end is provided with an axial loading oil cylinder 6 and a radial loading oil cylinder 7. The axial loading oil cylinder 6 and the radial loading oil cylinder 7 apply loads to the tested bearing 4 through the loading arm 5. Pressing the entire turntable bearing to apply pressure makes the overall force average. Although the data of the overall load and wear resistance can be tested in this way, for different working conditions, the turntable bearing sometimes has a large local force, which leads to a large friction at one place of the turntable bearing and more serious wear. Moreover, the force application positions may be different under different working conditions, and it is difficult for the testing devices in the prior art to conduct tests. Summary of the Invention

[0003] In view of this, the present invention provides a multi-condition turntable bearing testing machine to solve the above technical problems.

[0004] A multi-condition turntable bearing testing machine, wherein the turntable bearing includes a limit disc, an annular groove provided on the limit disc, an outer ring rotatably provided on the annular groove, and a cover disc provided on the limit disc. A circle of first connection holes is arranged on the upper circumference of the outer ring. The multi-condition turntable bearing testing machine includes a frame, a rotating mechanism provided on the frame, a pressing block mechanism provided on the frame, and a downward pressing mechanism provided on the frame. The rotating assembly includes a rotatably provided test seat and a test seat cover plate provided on the turntable bearing. A circular installation groove and a circle of second connection holes arranged circumferentially are provided on the test seat. The turntable bearing is arranged in the installation groove, the second connection holes are coaxially arranged and connected with the first connection holes, and the test seat cover plate is arranged on the cover disc. The pressing block mechanism includes a fixing plate vertically arranged on the frame, a cross bar horizontally arranged on the fixing plate, a pressing block arranged at one end of the cross bar, a guide wheel arranged on one side of the frame, a rope arranged on the test seat cover plate, and a weight arranged on the rope. The pressing block presses on the test seat cover plate, one end of the rope is connected with the test seat cover plate, the other end is wound around the guide wheel and then connected with the weight, and the rope between the test seat cover plate and the guide wheel is horizontally arranged. The downward pressing mechanism includes a screw rod moving device arranged on the frame, a cylinder arranged on the screw rod moving device, a pressure sensor arranged on the output end of the cylinder, and a pressing head arranged on the pressure sensor. The output end of the cylinder passes through the top plate and the output direction is close to or away from the pressing block, and the pressing head is pressed on different positions of the pressing block through the screw rod moving device and the cylinder.

[0005] Further, the frame includes a bottom plate, a plurality of support columns provided on the bottom plate, a top plate provided on the support columns, and a mounting plate provided on the support columns. One end of the support column is connected with the bottom plate, the other is connected with the top plate, and the support column passes through the mounting plate, and the mounting plate is located between the top plate and the bottom plate.

[0006] Further, the rotating assembly further includes a servo motor disposed on the base plate, a first coupling disposed on the servo motor, a torque sensor disposed on the first coupling, a second coupling disposed on the torque sensor, a rotating shaft disposed on the second coupling, and a bearing fixing seat disposed on the mounting plate. The output shaft at one end of the torque sensor is connected to the output end of the servo motor through the first coupling, and the output shaft at the other end is connected to the rotating shaft through the second coupling. One end of the rotating shaft is connected to the second coupling, and the other end passes through the bearing fixing seat and is provided with the test seat. A bearing is disposed in the bearing fixing seat.

[0007] Further, the diameter of the mounting groove is larger than the diameter of the limiting disc.

[0008] Further, the rotating assembly further includes a mounting seat disposed on one side of the torque sensor and vertically on the frame, and a deep groove ball bearing seat sleeved on the rotating shaft. The deep groove ball bearing seat is connected to the mounting seat and is provided with a deep groove ball bearing. The deep groove ball bearing seat is located between the second coupling and the mounting plate.

[0009] Further, the fixing plate is provided with a through hole for passing the cross bar, and the diameter of the through hole is larger than the diameter of the cross bar.

[0010] Further, the size of the pressing block is the same as the size of the test seat cover plate.

[0011] Further, the end of the indenter facing the pressing block is provided with a rounded corner.

[0012] Compared with the prior art, a multi-condition turntable bearing testing machine provided by the present invention sets the turntable bearing on the test seat, and the test seat cover plate is set on the turntable bearing through fasteners. By the lead screw moving device and the cylinder, the indenter can press the points at different positions on the pressing block, so that the pressure at one point on the pressing block increases. When the pressure is transmitted to the turntable bearing, the wear resistance of the turntable bearing under different stress positions can be detected. One end of the rope is connected to the test seat cover plate, and the other end is wound around the guide wheel and then connected to the weight, so that the turntable bearing is subjected to a horizontal pulling force, and the pressure on the side surface of the turntable bearing increases, thereby the wear resistance of the turntable bearing under the condition of side force can be detected. In addition, the two can be used in combination to detect the wear resistance of the turntable bearing under the condition of oblique force, so as to realize the detection under multiple working conditions. Description of the Drawings

[0013] Figure 1A cross-sectional view of a multi-condition turntable bearing testing machine provided by the present invention.

[0014] Figure 2 For Figure 1 a cross-sectional view of the side of the multi-condition turntable bearing testing machine.

[0015] Figure 3 For Figure 1 a cross-sectional view of the rotating mechanism of the multi-condition turntable bearing testing machine.

[0016] Figure 4 For Figure 1 a cross-sectional view of the turntable bearing and the test seat of the multi-condition turntable bearing testing machine.

[0017] Figure 5 For Figure 1 a cross-sectional view of the pressing block mechanism and the downward pressing mechanism of the multi-condition turntable bearing testing machine. Detailed implementation manners

[0018] The following further elaborates on specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein does not limit the protection scope of the present invention.

[0019] As Figures 1 to 5 shown, it is a structural schematic diagram of a multi-condition turntable bearing testing machine provided by the present invention. The multi-condition turntable bearing testing machine includes a frame 10, a rotating mechanism 20 disposed on the frame 10, a pressing block mechanism 30 disposed on the frame 10, and a downward pressing mechanism 40 disposed on the frame 10. It can be conceived that the multi-condition turntable bearing testing machine further includes some other functional structures, such as connection components, driving devices, etc., which are well-known technologies to those skilled in the art and will not be elaborated herein.

[0020] First, it should be noted that the multi-condition turntable bearing testing machine is used to test a turntable bearing 100. The turntable bearing 100 includes a limit disk 110, an annular intermediate groove 120 disposed on the limit disk 11, an outer ring 130 rotatably disposed in the annular intermediate groove 120, and a cover disk 140 disposed on the limit disk 110. A circle of first connection holes 150 is arranged on the upper circumference of the outer ring 130. Its structure is similar to a wear-resistant turntable bearing disclosed in Patent No. CN201710450136.6, which should be prior art and will not be elaborated herein.

[0021] The frame 10 includes a bottom plate 11, a plurality of support columns 12 arranged on the bottom plate 11, a top plate 13 arranged on the support columns 12, and a mounting plate 14 arranged on the support columns 12. One end of the support column 12 is connected to the bottom plate 11, and the other end is connected to the top plate 13, and the support column 12 passes through the mounting plate 14, so that the mounting plate 14 is located between the top plate 13 and the bottom plate 11. The top plate 13 is used to arrange the downward pressing mechanism 40, and the bottom plate 11 and the mounting plate 14 are used to arrange the rotating mechanism 20. The frame 10 is used to carry the above-mentioned various functional modules. Therefore, the bed body is provided with a variety of functional structures, such as screws, bolts, jigs, etc. to complete the installation and assembly of the above-mentioned functional modules, which can be set according to actual needs and will not be elaborated in detail here.

[0022] The rotating assembly 20 includes a servo motor 21 arranged on the bottom plate 11, a first coupling 22 arranged on the servo motor 21, a torque sensor 23 arranged on the first coupling 22, a second coupling 24 arranged on the torque sensor 23, a rotating shaft 25 arranged on the second coupling 24, a bearing fixing seat 26 arranged on the mounting plate 14, a test seat 27 arranged at one end of the rotating shaft 25, and a test seat cover plate 28 for fixing the turntable bearing 100.

[0023] The output shaft at one end of the torque sensor 23 is connected to the output end of the servo motor 21 through the first coupling 22, and the output shaft at the other end is connected to the rotating shaft 25 through the second coupling 24, so that the servo motor 21 can drive the torque sensor 23 and the rotating shaft 25 to rotate. The torque sensor 23 can detect the torsional moment on the rotating shaft 25 and convert the physical change of the torsion force into an accurate electrical signal for transmission. The first and second couplings 22, 24 are used to connect two rotating parts and rotate together during the transmission of motion and power, that is, to connect the output end of the torque sensor 23 and the servo motor 21, connect the torque sensor 23 and the rotating shaft 25, and also play a role in overload protection.

[0024] One end of the rotating shaft 25 is connected to the second coupling 24, and the other end passes through the bearing fixing seat 26 and is provided with the test seat 27. A bearing is arranged in the bearing fixing seat 26 to support the rotating rotating shaft 25 passing through the mounting plate 14.

[0025] The test seat 27 is used to set the slewing bearing 100. A circular mounting groove 271 and a circle of second connection holes 272 arranged circumferentially are provided on the test seat 27. The mounting groove 271 is used to place the slewing bearing 100. The diameter of the mounting groove 271 is larger than the diameter of the limiting disc 110. The second connection holes 272 are coaxially arranged with the first connection holes 150 and are fixed to each other by inserting connecting pieces. Thus, when the test seat 27 rotates with the rotating shaft 25, the outer ring 130 can be driven to rotate.

[0026] The test seat cover plate 28 is arranged on the cover plate 140 through fasteners. The test seat cover plate 28 is pressed by the pressing block mechanism 30 and does not rotate, so that the cover plate 140 and the limiting disc 110 do not rotate, to simulate the working state of the slewing bearing 100.

[0027] In order to better fix the rotating assembly 20, the rotating assembly 20 is further provided with a mounting seat 29 which is arranged on one side of the torque sensor 23 and is vertically arranged on the frame 10, and a deep groove ball bearing seat 210 sleeved on the rotating shaft 25. The mounting seat 29 is connected to the side wall of the torque sensor 23 to fix the torque sensor 23, and its output shaft can still rotate. The deep groove ball bearing seat 210 is connected to the mounting seat 29 and is provided with a deep groove ball bearing. The deep groove ball bearing seat 210 is located between the second coupling 24 and the mounting plate 14. It can bear radial loads or combined loads of radial and axial loads acting simultaneously, and can also be used for machine parts bearing axial loads, to improve the stability of the rotating shaft 25 when the pressing mechanism 40 presses down.

[0028] The pressing block mechanism 30 includes a fixing plate 31 vertically arranged on one side of the mounting plate 13, a cross bar 32 horizontally arranged on the fixing plate 31, a pressing block 33 arranged at one end of the cross bar 32, a guide wheel 34 arranged on one side of the top plate 13, a rope 35 arranged on the test seat cover plate 28, and a weight 36 arranged on the rope 35.

[0029] The fixed plate 31 is located on the side of the mounting plate 13 close to the guide wheel 34. The fixed plate 31 is provided with a perforation 311 for passing through the cross bar 32, and the diameter of the perforation 311 is larger than the diameter of the cross bar 32, so that the cross bar 32 has a certain movement space. The pressing block 23 presses on the test seat cover plate 28, and the size of the pressing block 23 is the same as that of the test seat cover plate 28 to ensure even stress. One end of the rope 35 is connected to the test seat cover plate 28, and the other end is wound around the guide wheel 34 and then connected to the weight 36. The guide wheel 34 is at the same height as the test seat cover plate 28, so that the range from the test seat cover plate 28 to the guide wheel 34 is horizontally arranged. The pressing block mechanism 30 is used to cooperate with the downward pressing mechanism 40, and the specific description will be given below in combination with the downward pressing mechanism 40.

[0030] The downward pressing mechanism 40 includes a screw rod moving device 41 arranged on the top plate 14, a cylinder 42 arranged on the screw rod moving device 41, a pressure sensor 43 arranged on the output end of the cylinder 42, and a pressing head 44 arranged on the pressure sensor 43.

[0031] The screw rod moving device 41 is composed of a slide rail, a driving motor, a screw rod, and a screw rod slider, which can convert the rotary motion into a linear motion to drive the cylinder 42 to move. The composition and principle of the screw rod moving device 41 should be prior art and will not be elaborated here. The output end of the cylinder 42 passes through the top plate 14 and the output direction is close to or away from the pressing block 23. The end of the pressing head 44 facing the pressing block 23 is provided with a rounded corner. By means of the screw rod moving device 41 and the cylinder 42, the pressing head 44 can press different points on the pressing block 23, so that the pressure at one point on the pressing block 23 increases. When the pressure is transmitted to the turntable bearing 100, the wear resistance of the turntable bearing 100 under different force positions can be detected. Without using the downward pressing mechanism 40, only relying on the pressing block 23 can evenly press the turntable bearing 100, so that the wear resistance and load performance under average stress can be detected. Since one end of the rope 35 is connected with the weight 36 and the rope 35 is horizontally arranged in the range between the test seat cover plate 28 and the guide wheel 34, the test seat cover plate 28 will receive a horizontal pulling force. And since the test seat cover plate 28 is connected to the turntable bearing 100, the pressure on the side of the turntable bearing 100 increases, so that the wear resistance of the turntable bearing 100 under side force can be detected. In addition, the downward pressing mechanism 40, the rope 35, and the weight 36 can be used in combination to make the turntable bearing 100 receive an obliquely downward force, and the wear resistance of the turntable bearing 100 under oblique force can be detected to achieve detection under multiple working conditions.

[0032] Compared with the prior art, a multi-condition turntable bearing testing machine provided by the present invention sets the turntable bearing 100 on the test seat 27, and the test seat cover plate 28 is arranged on the turntable bearing 100 through fasteners. By means of the lead screw moving device 41 and the cylinder 42, the indenter 44 can press down on points at different positions on the pressure block 23, so that the pressure at one point on the pressure block 23 increases. When the pressure is transmitted to the turntable bearing 100, the wear resistance of the turntable bearing 100 under different stress positions can be detected. One end of the rope 35 is connected to the test seat cover plate 28, and the other end is wound around the guide pulley 34 and then connected to the weight 36, so that the turntable bearing 100 is subjected to a horizontal tensile force, and the pressure on the side surface of the turntable bearing 100 increases, thereby the wear resistance of the turntable bearing 100 under the condition of side surface stress can be detected. In addition, the two can be used in combination to detect the wear resistance of the turntable bearing 100 under the condition of oblique stress, so as to realize the detection under multiple working conditions.

[0033] By means of the lead screw moving device 41 and the cylinder 42, the indenter 44 can press down on points at different positions on the pressure block 23, so that the pressure at one point on the pressure block 23 increases. When the pressure is transmitted to the turntable bearing 100, the wear resistance of the turntable bearing 100 under different stress positions can be detected. At the same time, since one end of the rope 35 is connected with the weight 36 and the rope 35 is horizontally arranged within the range between the test seat cover plate 28 and the guide pulley 34, the test seat cover plate 28 will be subjected to a horizontal tensile force. And because the test seat cover plate 28 is connected with the turntable bearing 100, the pressure on the side surface of the turntable bearing 100 increases, thereby the wear resistance of the turntable bearing 100 under the condition of side surface stress can be detected. In addition, the pressing mechanism 40, the rope 35 and the weight 36 can be used in combination to make the turntable bearing 100 receive an obliquely downward force, and detect the wear resistance of the turntable bearing 100 under the condition of oblique stress, so as to realize the detection under multiple working conditions.

[0034] The above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement or improvement within the spirit of the present invention is covered by the scope of the claims of the present invention.

Claims

1. A multi-condition turntable bearing testing machine, wherein the turntable bearing includes a limit disc, an annular groove provided on the limit disc, an outer ring rotatably provided on the annular groove, and a cover disc provided on the limit disc. A circle of first connection holes is arranged on the upper circumference of the outer ring, and it is characterized in that: The multi-condition turntable bearing testing machine includes a frame, a rotating mechanism disposed on the frame, a pressing block mechanism disposed on the frame, and a downward pressing mechanism disposed on the frame. The rotating assembly includes a rotatably arranged test seat and a test seat cover plate disposed on the turntable bearing. A circular mounting groove and a circle of circumferentially arranged second connection holes are provided on the test seat. The turntable bearing is disposed in the mounting groove. The second connection holes are coaxially arranged with and connected to the first connection holes. The test seat cover plate is disposed on the cover plate. The pressing block mechanism includes a fixing plate vertically disposed on the frame, a cross bar horizontally disposed on the fixing plate, a pressing block disposed at one end of the cross bar, a guide wheel disposed on one side of the frame, a rope disposed on the test seat cover plate, and a weight disposed on the rope. The pressing block presses on the test seat cover plate. One end of the rope is connected to the test seat cover plate, and the other end is wound around the guide wheel and then connected to the weight. The rope between the test seat cover plate and the guide wheel is horizontally arranged. The downward pressing mechanism includes a screw rod moving device disposed on the frame, a cylinder disposed on the screw rod moving device, a pressure sensor disposed on the output end of the cylinder, and a pressing head disposed on the pressure sensor. The output end of the cylinder passes through the top plate and the output direction is close to or away from the pressing block. The pressing head is pressed on different positions of the pressing block by the screw rod moving device and the cylinder.

2. The multi-condition turntable bearing testing machine according to claim 1, characterized in that: The frame includes a bottom plate, a plurality of support columns disposed on the bottom plate, a top plate disposed on the support columns, and a mounting plate disposed on the support columns. One end of the support column is connected to the bottom plate, and the other is connected to the top plate. And the support column passes through the mounting plate. The mounting plate is located between the top plate and the bottom plate.

3. The multi-condition turntable bearing testing machine according to claim 2, characterized in that: The rotating assembly further includes a servo motor disposed on the bottom plate, a first coupling disposed on the servo motor, a torque sensor disposed on the first coupling, a second coupling disposed on the torque sensor, a rotating shaft disposed on the second coupling, and a bearing fixing seat disposed on the mounting plate. The output shaft at one end of the torque sensor is connected to the output end of the servo motor through the first coupling, and the output shaft at the other end is connected to the rotating shaft through the second coupling. One end of the rotating shaft is connected to the second coupling, and the other end passes through the bearing fixing seat and is provided with the test seat. A bearing is disposed in the bearing fixing seat.

4. The multi-condition turntable bearing testing machine according to claim 1, characterized in that: The diameter of the mounting groove is larger than the diameter of the limiting disc.

5. The multi-condition turntable bearing testing machine according to claim 3, characterized in that: The rotating assembly is further provided with a mounting seat located on one side of the torque sensor and vertically arranged on the frame, and a deep groove ball bearing seat sleeved on the rotating shaft. The deep groove ball bearing seat is connected to the mounting seat and is provided with a deep groove ball bearing. The deep groove ball bearing seat is located between the second coupling and the mounting plate.

6. The multi-condition turntable bearing testing machine according to claim 1, characterized in that: The fixing plate is provided with a perforation for passing through the cross bar, and the diameter of the perforation is larger than the diameter of the cross bar.

7. The multi-condition turntable bearing testing machine according to claim 1, characterized in that: The size of the pressing block is the same as that of the test seat cover plate.

8. The multi-condition turntable bearing testing machine according to claim 1, characterized in that: One end of the indenter facing the pressing block is provided with a rounded corner.

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