Cam-loaded tapered roller bearing testing machine

Abstract

The present invention discloses a cam-loaded tapered roller bearing testing machine, which includes a KRL adapter, a main machine, and a constant temperature water bath; the main machine includes a servo motor and a load-bearing main shaft, a touch screen is installed on the side of the main machine, the servo motor is fixed to the load-bearing main shaft through a coupling, and a tapered roller bearing for ensuring the high-pressure load-bearing capacity and high-speed rotation of the load-bearing main shaft is arranged in the load-bearing main shaft; the KRL adapter includes an adapter body, and a tapered roller bearing for realizing the shearing of the lubricating oil to be tested is arranged in the adapter body. The present invention provides a special tapered roller bearing testing machine, which solves the problems of cumbersome installation, complex operation, poor control force accuracy, etc. brought by the modification of the previous four-ball machine, improves the reliability and repeatability of test data, provides the recording of test parameters, and ensures the traceability of data.

Description

Technical Field

[0001] The present invention relates to the technical field of testing instruments, and particularly to a cam-loaded tapered roller bearing testing machine. Background Art

[0002] By using a tapered roller bearing testing machine, under test conditions similar to those of a gearbox, the lubricating oil is subjected to mechanical shear stress, resulting in permanent viscosity loss, and the viscosity shear stability of the lubricating oil is represented by the decrease rate of the kinematic viscosity of the test lubricating oil before and after the test.

[0003] For existing tapered roller bearing testing machines, they are all based on the main body of an existing four-ball machine and used in conjunction with a special KRL adapter, which causes a series of difficulties in operation and use, such as the large difficulty in installing and aligning the KRL adapter, high running noise, poor stability, etc. The most direct result is the poor consistency of test results and excessive viscosity loss; in addition, most of the tapered roller bearing testing machines modified from four-ball machines use the method of weight lever loading. During operation, the vibration of the whole machine is extremely likely to cause the lever to swing, resulting in unstable force and affecting the test results; the total length of the entire test time is more than 20 hours. Most of the tapered roller bearing testing machines modified from four-ball machines do not have targeted temperature control and bearing capacity control settings and records, do not have the function of unattended monitoring, have great potential safety hazards in the test, and poor traceability of data. Summary of the Invention

[0004] The purpose of this patent is to provide a cam-loaded tapered roller bearing testing machine. The present invention solves the precise control of the load borne by the KRL adapter in the test, enhances the stability of the instrument operation, improves the operability of the instrument, and ensures the repeatability and accuracy of the instrument test results.

[0005] A cam-loaded tapered roller bearing testing machine according to an embodiment of the present invention includes a KRL adapter, a main body, and a constant temperature water bath;

[0006] The main body includes a servo motor and a load-bearing main shaft. A touch screen is installed on the side of the main body. The servo motor is fixed to the load-bearing main shaft through a coupling. A tapered roller bearing for ensuring the high-pressure load-bearing capacity and high-speed rotation of the load-bearing main shaft is provided inside the load-bearing main shaft;

[0007] The KRL adapter includes an adapter main body. A tapered roller bearing for realizing the shear of the lubricating oil to be tested is provided inside the adapter main body. A circulating water channel is provided inside the adapter main body. Two circulating water joints are provided at the inlet and outlet ends of the circulating water channel. The constant temperature water bath is connected to the circulating water joints to realize water circulation.

[0008] Preferably, the KRL adapter further includes a rotating main shaft, an oil temperature sensor, a sealing ring, a lower gasket, a lower fixed circular hole assembly, and an upper tightening cover;

[0009] The upper tightening cover is provided on the side of the rotating main shaft, and the upper tightening cover is snap-fitted and installed on the adapter body. The upper tightening cover is provided with a ferrule sealing device. The rotating main shaft is press-fitted and sleeved on the inner ring of the tapered roller bearing. The oil temperature sensor is fixed to the upper tightening cover through the ferrule sealing device.

[0010] Preferably, a cam loading device for providing a stable bearing load for the KRL adapter is provided in the main machine.

[0011] Preferably, a refrigeration compressor, an electric heating tube, and a water temperature sensor are provided in the constant temperature water bath. A circulating water pump for circulating water into the circulating water channel is also provided in the constant temperature water bath.

[0012] Preferably, the cam loading device includes a zero-point positioning sensor, a push rod support, a pressure sensor, a cam, an angular contact bearing, and a linear guide rod mechanism;

[0013] A lower fixed circular hole is provided on the side of the adapter body away from the constant temperature water bath. A cam is provided in the linear guide rod mechanism. The cam is connected to a planetary gear reduction stepping motor through a coupling. A zero-point positioning sensor is provided on the side of the linear guide rod mechanism. The starting position of the cam is controlled by the zero-point positioning sensor;

[0014] Preferably, the surface of the cam is connected to the jacking body through an angular contact bearing. The jacking body is installed on the linear guide rod mechanism and realizes linear lifting through the linear guide rod.

[0015] Preferably, one side of the jacking body away from the angular contact bearing is connected to the pressure sensor. The pressure sensor is connected to the lower fixed circular hole through the push rod support for measuring the force on the tapered roller bearing in the KRL adapter.

[0016] Preferably, a power switch is provided on the side of the main machine.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a cam-loaded tapered roller bearing testing machine. The lubricating oil to be tested is loaded into the KRL adapter, which is internally provided with a tapered roller bearing. The main machine applies a constant rotational speed and a stable load pressure to the tapered roller bearing. At the same time, a constant temperature water bath provides a constant temperature water flow for the KRL adapter to ensure the constant temperature of the lubricating oil to be tested, thereby realizing the shearing of the lubricating oil to be tested and causing a permanent annual loss of the lubricating oil. The shearing stability of the lubricating oil is characterized by the annual loss of the lubricating grease to be tested before and after the experiment. The present invention uses a cam loading device to apply a load pressure to the KRL adapter, with more precise pressure adjustment, realizing dynamic pressure precise compensation, ensuring the accuracy and repeatability of the load pressure. At the same time, the cam mechanism greatly reduces the static friction, has small movement wear, longer service life and better stability of the whole machine; the control of the main machine integrates the temperature control of the constant temperature water bath, directly controls the temperature of the lubricating oil to be tested, realizes unmanned monitoring of the test temperature. At the same time, the system integrates the recording of temperature and pressure, realizing the traceability of key parameters. The whole machine provides accurate analysis data for the test results, increases the accuracy and repeatability of the test results, simplifies the manual operation process, and avoids the errors of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0020] Figure 1 is a schematic diagram of the overall structure of the cam-loaded tapered roller bearing testing machine proposed by the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the KRL adapter of the cam-loaded tapered roller bearing testing machine proposed by the present invention;

[0022] Figure 3 is a cross-sectional view of the KRL adapter of the cam-loaded tapered roller bearing testing machine proposed by the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the cam loading device of the cam-loaded tapered roller bearing testing machine proposed by the present invention;

[0024] Figure 5 is a cross-sectional view of the cam loading device of the cam-loaded tapered roller bearing testing machine proposed by the present invention.

[0025] In the figure: 1. Touch screen; 2. Upper bearing spindle device; 3. Power switch; 4. Servo motor; 5. Bearing spindle; 6. KRL adapter; 7. Cam loading device; 8. Rotating spindle; 9. Oil temperature sensor; 10. Ferrule sealing device; 11. Circulating water joint; 12. Tapered roller bearing; 13. Sealing ring; 14. Adapter body; 15. Lower gasket; 16. Lower fixing round hole; 17. Upper tightening cover; 18. Planetary gear reduction stepping motor; 19. Coupling; 20. Zero point positioning sensor; 21. Ejector rod support; 22. Pressure sensor; 23. Jacking body; 24. Angular contact bearing; 25. Linear guide bar mechanism; 26. Cam; 27. Constant temperature water bath. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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 should not be construed as a limitation to the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Referring to Figures 1-5 As shown, a cam 26 - loaded tapered roller bearing testing machine includes a KRL adapter 6, a main machine, and a constant - temperature water bath 27;

[0032] The main machine includes a servo motor 4 and a load - bearing main shaft 5. A touch screen 1 is installed on the side of the main machine. The servo motor 4 is fixed to the load - bearing main shaft 5 through a coupling 19. A tapered roller bearing 12 for ensuring the high - pressure load - bearing capacity and high - speed rotation of the load - bearing main shaft 5 is provided inside the load - bearing main shaft 5;

[0033] The KRL adapter 6 includes an adapter body 14. A tapered roller bearing 12 for realizing the shearing of the lubricating oil to be tested is provided inside the adapter body 14. A circulating water channel is provided inside the adapter body 14. Two circulating water joints 11 are provided at the inlet and outlet ends of the circulating water channel. The constant - temperature water bath 27 is connected to the circulating water joints 11 to realize water circulation.

[0034] The KRL adapter 6 further includes a rotating main shaft 8, an oil - temperature sensor 9, a sealing ring 13, a lower gasket 15, a lower fixed round - hole 16 assembly, and an upper tightening cover 17;

[0035] The rotating main shaft 8 is provided with an upper tightening cover 17 on its side, and the upper tightening cover 17 is snap - fitted and installed on the adapter body 14. A ferrule sealing device 10 is provided on the upper tightening cover 17. The rotating main shaft 8 is press - fitted and sleeved on the inner ring of the tapered roller bearing 12. The oil - temperature sensor 9 is fixed to the upper tightening cover 17 through the ferrule sealing device 10.

[0036] A cam loading device 7 for providing a stable load - bearing capacity for the KRL adapter 6 is provided inside the main machine.

[0037] The constant - temperature water bath 27 is provided with a refrigeration compressor, an electric heating tube, and a water - temperature sensor. A circulating water pump for flowing the water circulation into the circulating water channel is also provided inside the constant - temperature water bath 27.

[0038] The cam loading device 7 includes a zero - point positioning sensor 20, a push - rod support 21, a pressure sensor 22, a cam 26, an angular contact bearing 24, and a linear guide - rod mechanism 25;

[0039] A servo motor 4 is installed on the upper part of the KRL adapter 6. Concentric installation and positioning are achieved by rotating the pin shaft and the round table structure at the upper end of the main shaft 8 and the notch and round hole structures of the bearing main shaft 5 of the host. A cam loading device 7 is installed on the lower part of the KRL adapter 6. Concentric installation and positioning are achieved by the round table structure of the round hole installed at the bottom and the ejector rod support 21 at the upper end of the cam loading device 7 of the host.

[0040] On the side of the adapter body 14 away from the constant temperature water bath 27, a lower fixed round hole 16 is provided. A cam 26 is arranged inside the linear guide rod mechanism 25. The cam 26 is connected to the planetary gear reduction stepping motor through a coupling 19. A zero point positioning sensor 20 is arranged on the side of the linear guide rod mechanism 25. The starting position of the cam 26 is controlled by the zero point positioning sensor 20.

[0041] The surface of the cam 26 is connected to the jacking body 23 through an angular contact bearing 24. The jacking body 23 is installed on the linear guide rod mechanism 25 and realizes linear lifting through the linear guide rod.

[0042] One side of the jacking body 23 away from the angular contact bearing 24 is connected to a pressure sensor 22. The pressure sensor 22 is connected to the lower fixed round hole 16 through the ejector rod support 21 for measuring the force on the tapered roller bearing 12 in the KRL adapter 6.

[0043] A power switch 3 is arranged on the side of the host. The power switch 3 is used to control the start and stop of the entire device.

[0044] Embodiment:

[0045] The KRL adapter 6, the host, and the constant temperature water bath 27; The KRL adapter 6 is internally provided with a tapered roller bearing 12. The lubricating oil to be tested is loaded at the inner ring position of the tapered roller bearing 12 and infiltrates the bearing. The upper tightening cover 17 is used to press the sealing ring 13 and the outer ring of the tapered roller bearing 12, ensuring that the lubricating oil to be tested is fully sealed without leakage. At the same time, when the tapered roller bearing 12 rotates, the fixed part of the bearing outer ring does not slide, ensuring sufficient shearing of the lubricating oil to be tested; A through hole is provided at the flat end of the rotating main shaft 8, ensuring that when the tapered roller bearing 12 rotates to shear the lubricating oil to be tested, the lubricating oil to be tested can pass through the through hole to achieve full internal circulation, ensuring that all the lubricating oil to be tested is fully sheared.

[0046] The servo motor 4 is connected to the upper part of the KRL adapter 6 through the upper bearing main shaft 5 device 2, providing a constant rotational speed for the tapered roller bearing 12. The upper part of the rotating main shaft 8 has a pin shaft and a round table structure, which are correspondingly installed with the notch and round hole structures at the lower end of the bearing main shaft 5, ensuring the relative position fixation and concentric positioning of the upper structure of the KRL adapter 6. A diversion structure is provided in the middle of the rotating main shaft 8 to ensure that when rotating, the lubricating oil to be tested returns to the inside of the KRL adapter 6 along the set path, avoiding the loss of the lubricating oil to be tested caused by splashing. The KRL adapter 6 is correspondingly installed with the round table structure at the upper part of the jacking support rod through the lower installation round hole, ensuring concentric positioning.

[0047] The constant temperature water bath 27 is used to provide circulating water flow for the KRL adapter 6. It flows into the adapter body 14 through the circulating water joint 11. The adapter body 14 is internally provided with a circulating pipeline, and the circulating pipeline adopts a continuous "S" - shaped design to extend the flowing - through time of the circulating water flow, taking away the excess heat generated by shearing to the maximum extent. The main machine measures the temperature of the lubricating grease to be tested in real - time through the oil temperature sensor 9 and controls the temperature rise and fall of the constant temperature water bath according to this temperature, thereby ensuring the constant temperature of the lubricating oil to be tested. The oil temperature sensor 9 is fixed to the upper tightening cover 17 through a ferrule - sealed grease filling, while ensuring the sealing of the oil temperature sensor 9.

[0048] The cam loading device 7 is connected to the KRL adapter 6 through a jacking rod to provide a stable load-bearing capacity for the KRL adapter 6. The cam 26 is connected to the planetary gear reduction stepper motor 18 through a coupling 19. The main machine controls the rotation of the planetary gear reduction stepper motor 18 through a stepper motor driver, and controls the rotation angle of the planetary gear reduction stepper motor 18 according to the pressure situation measured by the pressure sensor 22 in real time, driving the cam 26 to rotate, so as to control the load-bearing capacity of the tapered roller bearing 12. The cam 26 can be divided into a rapid jacking stage, a slow jacking stage, a rapid falling stage and a far rest stage according to the length of the distance from the surface point to the center of motion. Among them, the rapid jacking stage realizes the rapid lifting of the KRL adapter 6 and quickly increases the force on the tapered roller bearing 12. The slow jacking stage realizes the slow lifting of the KRL adapter 6 and precisely adjusts the force on the tapered roller bearing 12 to the set pressure. The rapid falling stage and the far rest stage are for the design requirements of the cam 26 and do not participate in the motion control here. The motion of the cam 26 is controlled by the planetary gear reduction stepper motor 18, and the rotation angle of the cam 26 is controlled by a control circuit. The control circuit automatically controls the rotation speed of the planetary gear reduction stepper motor 18 according to the size of the set value. The closer it is to the set value, the slower the rotation speed of the planetary gear reduction stepper motor 18, and the higher the adjustment accuracy of the load-bearing capacity. The load-bearing capacity limit range of the whole machine can be adjusted by adjusting the reduction ratio of the planetary gear reduction stepper motor 18. The starting position of the cam 26 is controlled by a zero-position sensor 20. When the zero-position sensor 20 is triggered, the planetary gear reduction stepper motor 18 is forced to stop, and the position of the cam 26 returns to the zero position. The surface of the cam 26 is connected to the jacking main body 23 through an angular contact bearing 24. The angular contact bearing 24 reduces the static friction between the surface of the cam 26 and reduces wear. The jacking main body 23 realizes linear lifting through a linear guide rod mechanism 25.

[0049] The present invention provides a cam 26 - loaded tapered roller bearing 12 testing machine. The lubricating oil to be tested is loaded into the KRL adapter 6. The KRL adapter 6 internally houses the tapered roller bearing 12. The main machine applies a constant rotational speed and a stable load pressure to the tapered roller bearing 12. At the same time, the constant temperature water bath 27 provides a constant temperature water flow for the KRL adapter 6 to ensure the constant temperature of the lubricating oil to be tested, thereby realizing the shearing of the lubricating oil to be tested and causing a permanent annual loss of the lubricating oil. The shearing stability of the lubricating oil is characterized by the annual loss of the lubricating grease to be tested before and after the experiment. The present invention uses a cam loading device 7 to apply a load pressure to the KRL adapter 6, with more precise pressure regulation, realizing dynamic pressure precise compensation, ensuring the accuracy and repeatability of the load pressure. At the same time, the cam 26 mechanism greatly reduces the static friction, has small motion wear, and the whole machine has a longer service life and better stability. The main machine control integrates the temperature control of the constant temperature water bath 27, directly controls the temperature of the lubricating oil to be tested, realizes unmanned monitoring of the test temperature. At the same time, the system integrates the recording of temperature and pressure, realizing the traceability of key parameters. The whole machine provides accurate analysis data for the test results, increases the accuracy and repeatability of the test results, simplifies the manual operation process, and avoids the errors of manual operation.

[0050] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. Cam-loaded tapered roller bearing testing machine, Characterized in that: It includes a KRL adapter, a main machine, and a constant temperature water bath; The main machine includes a servo motor and a load-bearing main shaft. A touch screen is installed on the side of the main machine. The servo motor is fixed to the load-bearing main shaft through a coupling. A tapered roller bearing for ensuring the high-pressure load-bearing capacity and high-speed rotation of the load-bearing main shaft is provided inside the load-bearing main shaft; The KRL adapter includes an adapter body. A tapered roller bearing for realizing the shearing of the lubricating oil to be tested is provided inside the adapter body. A circulating water channel is arranged inside the adapter body. Two circulating water joints are provided at the inlet and outlet ends of the circulating water channel. The constant temperature water bath is connected to the circulating water joints to realize water circulation; The KRL adapter further includes a rotating main shaft, an oil temperature sensor, a sealing ring, a lower gasket, a lower fixed round hole assembly, and an upper tightening cover; The upper tightening cover is arranged on the side of the rotating main shaft and is snap-fitted on the adapter body. A ferrule sealing device is provided on the upper tightening cover. The rotating main shaft is press-fitted and sleeved on the inner ring of the tapered roller bearing. The oil temperature sensor is fixed to the upper tightening cover through the ferrule sealing device; The lubricating oil to be tested is loaded at the position of the inner ring of the tapered roller bearing and wets the bearing. The upper tightening cover presses the sealing ring and the outer ring of the tapered roller bearing to ensure that the lubricating oil to be tested is fully sealed without leakage. At the same time, when the tapered roller bearing rotates, the fixed part of the outer ring of the bearing does not slide, ensuring the full shearing of the lubricating oil to be tested; a through hole is opened at the flat end of the rotating main shaft to ensure that when the tapered roller bearing rotates to realize the shearing of the lubricating oil to be tested, the lubricating oil to be tested can pass through the through hole to realize internal full circulation, ensuring that all the lubricating oil to be tested is completely sheared; The servo motor is connected to the upper part of the KRL adapter through an upper load-bearing main shaft device to provide a constant speed for the tapered roller bearing. The upper part of the rotating main shaft has a pin shaft and a round platform structure, which are correspondingly installed with the notch and round hole structure at the lower end of the load-bearing main shaft to ensure the fixed relative position and concentric positioning of the upper structure installation of the KRL adapter. A diversion structure is provided in the middle of the rotating main shaft to ensure that when rotating, the lubricating oil to be tested returns to the inside of the KRL adapter according to the set path, avoiding the splashing loss of the lubricating oil to be tested; the KRL adapter is correspondingly installed with the round platform structure at the upper part of the jacking rod through the lower installation round hole to ensure concentric positioning.

2. The cam-loaded tapered roller bearing testing machine according to claim 1, Characterized in that: A cam loading device for providing a stable load-bearing capacity for the KRL adapter is provided inside the main machine.

3. The cam-loaded tapered roller bearing testing machine according to claim 1, Characterized in that: A refrigeration compressor, an electric heating tube, and a water temperature sensor are provided inside the constant temperature water bath. A circulating water pump for flowing the water circulation into the circulating water channel is also provided inside the constant temperature water bath.

4. The cam-loaded tapered roller bearing testing machine according to claim 2, Characterized in that: The cam loading device includes a zero-positioning sensor, a push rod support, a pressure sensor, a cam, an angular contact bearing, and a linear guide rod mechanism; On the side of the adapter body away from the constant temperature water bath, there is a lower fixed round hole. Inside the linear guide rod mechanism, there is a cam, which is connected to the planetary gear reduction stepper motor through a coupling. On the side of the linear guide rod mechanism, there is a zero point positioning sensor, and the starting position of the cam is controlled by the zero point positioning sensor.

5. The cam-loaded tapered roller bearing testing machine according to claim 4, characterized in that: The surface of the cam is connected to the jacking body through an angular contact bearing. The jacking body is installed on the linear guide rod mechanism and realizes linear lifting through the linear guide rod.

6. The cam-loaded tapered roller bearing testing machine according to claim 5, characterized in that: One side of the jacking body away from the angular contact bearing is connected to a pressure sensor. The pressure sensor is connected to the lower fixed round hole through a jacking strut for measuring the force on the tapered roller bearing in the KRL adapter.

7. The cam-loaded tapered roller bearing testing machine according to claim 1, characterized in that: There is a power switch on the side of the main machine.

Images