Bearing protrusion measurement device and method

Abstract

A bearing protrusion measurement device. A bearing is driven by an air cylinder to vertically move for loading; an inner ring of the bearing is driven by an electric motor to rotate; by means of slotted structures on an adjustment disc (4) and a top plate (3), when a handle is manually operated, the distance between a plurality of pressing blocks (5) can be changed by means of the rotation of the adjustment disc (4), such that the plurality of pressing blocks (5) can simultaneously press against an outer ring or the inner ring of the bearing; moreover, the load acting on the bearing can be conveniently controlled by means of the reading of a pressure sensor (13); finally, the reading of a displacement sensor (6) relative to a mandrel (8) when the pressing blocks (5) press the outer ring of the bearing, and the reading of the displacement sensor (6) relative to the mandrel (8) when the pressing blocks (5) press the inner ring of the bearing are obtained; the difference between the two readings is the height difference between end faces of the inner ring and the outer ring of the bearing (7) to be measured, i.e., the measurement result of the bearing protrusion. Zero alignment is not required by means of standard parts. When the model of the bearing (7) to be measured needs to be replaced, only the mandrel (8) needs to be replaced to realize model-replacement measurement, without other adjustments, such that the operation is more convenient. Further disclosed is a measurement method based on the bearing protrusion measurement device.

Description

A measuring device and method for measuring bearing protrusion. Technical Field

[0001] This invention relates to the field of bearing measurement, and more particularly to a measuring device and method for measuring bearing protrusion. Background Technology

[0002] Currently, mechatronics-integrated protrusion measuring instruments are commonly used to measure bearing protrusion, such as the T6912 protrusion measuring instrument produced by Luoyang Bearing Research Institute. This type of protrusion measuring instrument includes a mechanical system, an electrical system, and measurement and control software. The mechanical part mainly includes the main body, air spindle, measuring fixture, loading device, and drive device. The electrical system mainly includes an electrical control box, control air circuit, sensor, and computer. The measurement and control software is installed on the computer and can be used for operation control, parameter setting, display, and storage of measurement results. The measurement process is as follows: first, the sensor is calibrated to zero using a standard part, and then the bearing under test is used to replace the standard part for measurement. At this time, the displacement sensor reading under the measuring load is the protrusion value of the bearing under test.

[0003] However, since this type of protrusion measuring instrument needs to be zeroed through a standard part, the error of the standard part itself will affect the measurement results. In addition, the error will accumulate after multiple movements, and it is also necessary to determine the frequency of zeroing the standard part. Furthermore, when changing models, the stroke of the drive device needs to be adjusted, and the adjustment steps need to be strictly followed, which affects the measurement efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a measuring device and method for measuring bearing protrusion, which is simple to change, convenient to adjust, and does not require zeroing with standard parts.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is: a measuring device and method for measuring bearing protrusion, comprising a frame, a housing for accommodating the bearing to be measured on the frame, a top plate on the top side of the housing, a cylinder vertically mounted on the bottom side of the housing, the upper end of the cylinder body penetrating the bottom surface of the housing, and air inlet and outlet ports respectively opened on the upper and lower sides of the cylinder body to facilitate driving the cylinder piston to move in the vertical direction. A drive shaft is coaxially mounted in the vertical center hole of the cylinder piston, the top end of the drive shaft extending into the housing and connecting to the bottom end of a mandrel. The top of the device has an outer arc surface for fitting the inner ring of the bearing under test. The axis of the outer arc surface coincides with the axis of the drive shaft. The bottom side of the outer arc surface is a stepped surface for supporting the lower end face of the inner ring of the bearing under test. The bottom end of the drive shaft extends to the bottom of the cylinder body and is connected to the motor so that the motor can drive the drive shaft, the spindle and the inner ring of the bearing under test to rotate synchronously. Pressure sensors are provided at the air inlet and outlet ports on the upper and lower sides of the cylinder body to control the load acting on the bearing under test when the cylinder piston drives the motor, the drive shaft, the spindle and the bearing under test to move up and down synchronously.

[0006] The top surface of the top plate is provided with a central shaft, the axis of which coincides with the axis of the transmission shaft. An adjustment plate is coaxially sleeved on the outside of the central shaft. The bottom surface of the adjustment plate slides on the top surface of the top plate. The adjustment plate is connected to a handle for rotating around the axis of the central shaft. Multiple radial grooves are provided on the top plate. The radial grooves penetrate the top plate vertically. One end of the radial groove along the length direction faces the central shaft, and the other end of the radial groove along the length direction extends radially along the central shaft. The multiple radial grooves are spaced apart along the circumference of the central shaft. Multiple arc-shaped grooves are provided on the adjustment plate. The arc-shaped grooves penetrate the adjustment plate vertically. Each of the multiple radial grooves has its own guide shaft. The bottom end of each of the multiple guide shafts extends into the housing and is connected to its own pressure block. The top end of each of the multiple guide shafts is inserted into the multiple arc-shaped grooves and extends to the top of the adjustment plate. Nuts are screwed onto the top end of the guide shafts to prevent the guide shafts from disengaging from the radial grooves and arc-shaped grooves.

[0007] When the adjusting disc rotates, it drives multiple guide shafts to move along multiple arc-shaped grooves, and causes the multiple guide shafts to move away from or towards the central shaft simultaneously along multiple radial grooves. This allows multiple pressure blocks to move to a position where they simultaneously press down on the upper end face of the inner ring of the bearing under test, or to a position where they simultaneously press down on the upper end face of the outer ring of the bearing under test. A displacement sensor is installed in the inner hole of the central shaft. The bottom end of the displacement sensor passes through the adjusting disc and the top plate and extends to the housing. When the cylinder piston drives the motor, transmission shaft, spindle, and bearing under test to rise synchronously, and causes multiple pressure blocks to simultaneously press down on the upper end face of the bearing under test, the bottom end of the displacement sensor can contact the top end of the spindle and perform measurement.

[0008] Preferably, the bottom end of the mandrel is detachably connected to the top end of the drive shaft via a stepped surface.

[0009] A method for measuring the bearing protrusion according to the above-mentioned measuring device includes the following steps:

[0010] Step 1: Place the bearing to be tested onto the outer arc surface of the top of the mandrel, and press the lower end face of the inner ring of the bearing to be tested onto the stepped surface of the top of the mandrel. Then, rotate the adjusting disc by the handle to move multiple pressure blocks to a position where they can simultaneously press down and contact the upper end face of the inner ring of the bearing to be tested.

[0011] Step 2: Air is introduced through the inlet and outlet ports on the lower side of the cylinder body and exhausted through the inlet and outlet ports on the upper side, thereby driving the cylinder piston to rise until the upper end face of the inner ring of the bearing under test is in contact with multiple pressure blocks. The pressure value of the cylinder is controlled by the measured value of the pressure sensor, thereby controlling the bearing under test to be loaded to the measured load. The measured value X1 of the displacement sensor is read. Then, the air is exhausted through the inlet and outlet ports on the lower side of the cylinder body and air is introduced through the inlet and outlet ports on the upper side, driving the cylinder piston to descend to the initial position.

[0012] Step 3: Rotate the adjustment disc with the handle to move multiple pressure blocks to a position where they can simultaneously press down and contact the upper end face of the outer ring of the bearing under test. Then, raise the cylinder piston again until the upper end face of the outer ring of the bearing under test contacts all the pressure blocks. Control the pressure value of the cylinder by the measurement value of the pressure sensor, thereby controlling the bearing under test to be loaded to the measurement load. Then, start the motor to drive the drive shaft, spindle and inner ring of the bearing under test to rotate. Read the measurement value X2 of the displacement sensor. Calculate X1-X2 to obtain the protrusion of the bearing under test.

[0013] Preferably, in step 2, when reading the measured value X1 of the displacement sensor, X1 is set to 0, and in step 3, the measured value X2 of the displacement sensor is the protrusion of the bearing to be measured.

[0014] According to the above technical solution, the beneficial effects of the present invention are:

[0015] This invention uses a cylinder to drive the vertical movement of the bearing for loading, and a motor to drive the inner ring of the bearing to rotate. The slotted structure on the adjusting plate and top plate allows manual operation of the handle to change the distance between multiple pressure blocks by rotating the adjusting plate. This allows multiple pressure blocks to simultaneously press on the outer or inner ring of the bearing. The load applied to the bearing can be easily controlled by readings from pressure sensors. The final result is the readings of the displacement sensor relative to the spindle when the pressure blocks press against the outer ring of the bearing, and the readings of the displacement sensor relative to the spindle when the pressure blocks press against the inner ring of the bearing. The difference between these two readings is the height difference between the inner and outer ring end faces of the bearing being measured, i.e., the measurement result of the bearing protrusion. Therefore, this invention does not require zeroing with standard parts, avoiding the influence of errors inherent in the standard parts themselves and the cumulative errors from multiple standard part replacements on the measurement results. This not only makes the measurement more accurate but also eliminates the need to consider the frequency of zeroing with standard parts, simplifying the operation process. Because the positions of multiple pressure blocks are adjustable, the structure of the pressure blocks and adjusting plate can measure various types of bearings. When it is necessary to change the type of bearing being measured, only the spindle needs to be replaced to achieve type change measurement, without other adjustments, making the operation more convenient. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the present invention;

[0017] Figure 2 is a schematic diagram of the bottom surface of the top plate;

[0018] Figure 3 is a schematic diagram of the top plate and the upper side of the adjustment plate.

[0019] The markings in the diagram are: 1. Frame, 2. Housing, 3. Top plate, 4. Adjustment plate, 5. Pressure block, 6. Displacement sensor, 7. Bearing to be tested, 8. Mandrel, 9. Drive shaft, 10. Cylinder body, 11. Cylinder piston, 12. Air inlet / outlet, 13. Pressure sensor, 14. Motor, 15. Radial groove, 16. Handle, 17. Central shaft, 18. Arc groove, 19. Guide shaft, 20. Nut. Detailed Implementation

[0020] Referring to the attached diagram, the specific implementation method is as follows:

[0021] As shown in Figure 1, a measuring device and method for measuring bearing protrusion includes a frame 1, a housing 2 for accommodating the bearing 7 to be measured on the frame 1, a top plate 3 on the top side of the housing 2, a cylinder vertically mounted on the bottom side of the housing 2, the upper end of the cylinder body 10 penetrating the bottom surface of the housing 2, and air inlet and outlet ports 12 respectively opened on the upper and lower sides of the cylinder body 10 to facilitate driving the cylinder piston 11 to move in the vertical direction, and a drive shaft 9 coaxially mounted in the vertical center hole of the cylinder piston 11.

[0022] As shown in Figure 1, the top end of the drive shaft 9 extends into the housing 2 and is detachably connected to the bottom stepped surface of the spindle 8. The top end of the spindle 8 is provided with an outer arc surface for fitting the inner ring of the bearing 7 to be tested. The axis of the outer arc surface coincides with the axis of the drive shaft 9. The bottom side of the outer arc surface is a stepped surface for supporting the lower end face of the inner ring of the bearing 7 to be tested. The bottom end of the drive shaft 9 extends to the bottom of the cylinder body 10 and is connected to the motor 14. The motor 14 can drive the drive shaft 9, the spindle 8 and the inner ring of the bearing 7 to be tested to rotate synchronously.

[0023] As shown in Figure 1, pressure sensors 13 are respectively installed at the air inlet and outlet ports 12 on the upper and lower sides of the cylinder body 10 (the upper pressure sensor 13 is partially obscured in the figure). The reading of the pressure sensor 13 represents the air pressure entering and leaving the cylinder, which can control the cylinder pressure in real time. This allows for convenient control of the load acting on the bearing 7 under test when the cylinder piston 11 drives the motor 14, transmission shaft 9, spindle 8 and bearing 7 under test to move up and down synchronously.

[0024] As shown in Figure 3, a central shaft 17 is provided on the upper surface of the top plate 3. The axis of the central shaft 17 coincides with the axis of the transmission shaft 9. An adjusting disc 4 is coaxially sleeved on the outer side of the central shaft 17. The bottom surface of the adjusting disc 4 is slidably placed on the upper surface of the top plate 3. The adjusting disc 4 is connected to a handle 16 for rotating around the axis of the central shaft 17. As shown in Figure 2, three radial grooves 15 are provided on the top plate 3. The radial grooves 15 penetrate the top plate 3 vertically. One end of the radial groove 15 faces the central shaft 17 along its length, and the other end of the radial groove 15 extends radially along the central shaft 17. The three radial grooves 15 are spaced apart along the circumference of the central shaft 17.

[0025] As shown in Figure 3, the adjustment plate 4 has three arc-shaped grooves 18 that extend vertically through the adjustment plate 4. Each of the three radial grooves 15 has a guide shaft 19 inserted into it. The bottom ends of the three guide shafts 19 extend into the housing 2 and are connected to their respective pressure blocks 5. The top ends of the three guide shafts 19 are inserted into the three arc-shaped grooves 18 and extend to the top of the adjustment plate 4. Nuts 20 are screwed onto the top ends of the guide shafts 19 to prevent them from disengaging from the radial grooves 15 and the arc-shaped grooves 18.

[0026] When the adjusting plate 4 rotates, it can drive the three guide shafts 19 to move along the three arc grooves 18 respectively, and make the three guide shafts 19 move away from or towards the central shaft 17 simultaneously along the three radial grooves 15, so that the three pressure blocks 5 can move to the position where they simultaneously press down on the upper end face of the inner ring of the bearing 7 under test, or make the three pressure blocks 5 move to the position where they simultaneously press down on the upper end face of the outer ring of the bearing 7 under test.

[0027] As shown in Figures 1 and 3, a displacement sensor 6 is installed in the inner hole of the central shaft 17. The bottom end of the displacement sensor 6 passes through the adjustment plate 4 and the top plate 3 and extends to the housing 2. When the cylinder piston 11 drives the motor 14, the transmission shaft 9, the spindle 8 and the bearing to be tested 7 to rise synchronously, and the three pressure blocks 5 simultaneously press down and contact the upper end face of the bearing to be tested 7, the bottom end of the displacement sensor 6 can contact the top end of the spindle 8 and perform measurement.

[0028] A method for measuring the bearing protrusion according to the above-mentioned measuring device includes the following steps:

[0029] Step 1: Place the bearing 7 to be tested onto the outer arc surface of the top of the mandrel 8, and press the lower end face of the inner ring of the bearing 7 to be tested onto the stepped surface of the top of the mandrel 8. Then, rotate the adjusting plate 4 through the handle 16 to move the three pressure blocks 5 to a position where they can simultaneously press down and contact the upper end face of the inner ring of the bearing 7 to be tested.

[0030] Step 2: Air is introduced through the lower air inlet / outlet 12 of the cylinder body 10 and vented through the upper air inlet / outlet 12, thereby driving the cylinder piston 11 to rise until the upper end face of the inner ring of the bearing under test 7 is in contact with all three pressure blocks 5. The pressure value of the cylinder is controlled by the measured value of the pressure sensor 13, thereby controlling the bearing under test 7 to be loaded to the measured load. The measured value X1 of the displacement sensor 6 is read. Then, the lower air inlet / outlet 12 of the cylinder body 10 is vented and the upper air inlet / outlet 12 is introduced, driving the cylinder piston 11 to descend to the initial position.

[0031] Step 3: Rotate the adjustment disc 4 using handle 16 to move the three pressure blocks 5 to a position where they can simultaneously press down and contact the upper end face of the outer ring of the bearing under test 7. Then, raise the cylinder piston 11 again until the upper end face of the outer ring of the bearing under test 7 contacts all three pressure blocks 5. Control the pressure value of the cylinder using the measured value of pressure sensor 13, thereby controlling the bearing under test 7 to be loaded to the measurement load. Then, start the motor 14 to drive the transmission shaft 9, spindle 8 and the inner ring of the bearing under test 7 to rotate. Read the measured value X2 of displacement sensor 6 and calculate X1-X2 to obtain the protrusion of the bearing under test 7.

[0032] To make the measurement process faster, in step 2, when reading the measured value X1 of displacement sensor 6, X1 is set to 0. In step 3, the measured value X2 of displacement sensor 6 is the protrusion of the bearing 7 to be measured.

[0033] This embodiment has the following advantages and positive effects:

[0034] 1. In this embodiment, the protrusion measurement result is obtained by directly measuring the height difference between the inner and outer ring end faces of the bearing under test, without the need for zeroing through a standard part.

[0035] 2. In this embodiment, the transmission shaft is installed in a hollow cylinder, which ensures the stability of the load and enables automatic rotational dynamic measurement.

[0036] 3. In this embodiment, the positions of the three pressure blocks are adjusted by adjusting the dial. When changing the model of the bearing being tested, only the mandrel needs to be replaced to achieve the model change measurement. No other adjustments are required, making the operation more convenient.

[0037] 4. Based on this measuring device and method, a fully automatic bearing protrusion measuring instrument can be developed for measuring the protrusion of batch bearings after assembly.

Claims

A device and method for measuring bearing protrusion, characterized in that: The device includes a frame (1), on which a housing (2) is provided for accommodating the bearing (7) to be tested. The top side of the housing (2) is covered with a top plate (3). A cylinder is vertically mounted on the bottom side of the housing (2). The upper end of the cylinder body (10) penetrates the bottom surface of the housing (2). The upper and lower sides of the cylinder body (10) are respectively provided with air inlet and outlet ports (12) to facilitate driving the cylinder piston (11) to move in the vertical direction. A drive shaft (9) is coaxially mounted in the vertical center hole of the cylinder piston (11). The top end of the drive shaft (9) extends into the housing (2) and is connected to the bottom end of the mandrel (8). The top end of the mandrel (8) is provided with an outer arc surface for fitting the inner ring of the bearing (7) to be tested. The axis of the outer arc surface coincides with the axis of the transmission shaft (9). The bottom side of the outer arc surface is a stepped surface used to support the lower end face of the inner ring of the bearing under test (7). The bottom end of the transmission shaft (9) extends to the bottom of the cylinder body (10) and is connected to the motor (14) so ​​that the motor (14) can drive the transmission shaft (9), the spindle (8) and the inner ring of the bearing under test (7) to rotate synchronously. The air inlet and outlet ports (12) on the upper and lower sides of the cylinder body (10) are respectively equipped with pressure sensors (13) so as to control the load acting on the bearing under test (7) when the cylinder piston (11) drives the motor (14), the transmission shaft (9), the spindle (8) and the bearing under test (7) to move up and down synchronously. A central shaft (17) is provided on the upper surface of the top plate (3). The axis of the central shaft (17) coincides with the axis of the transmission shaft (9). An adjusting plate (4) is coaxially sleeved on the outer side of the central shaft (17). The bottom surface of the adjusting plate (4) is slidably placed on the upper surface of the top plate (3). The adjusting plate (4) is connected to a handle (16) for driving it to rotate around the axis of the central shaft (17). Multiple radial grooves (15) are provided on the top plate (3). The radial grooves (15) penetrate the top plate (3) vertically. One end of the radial groove (15) along the length direction faces the central shaft (17), and the other end of the radial groove (15) along the length direction extends radially along the central shaft (17). Radial grooves (15) are spaced apart along the circumferential direction of the central axis (17). Multiple arc grooves (18) are provided on the adjustment plate (4). The arc grooves (18) penetrate the adjustment plate (4) vertically. Each of the multiple radial grooves (15) is provided with its own guide shaft (19). The bottom ends of the multiple guide shafts (19) extend into the housing (2) and are connected to their respective pressure blocks (5). The top ends of the multiple guide shafts (19) are inserted into the multiple arc grooves (18) and extend to the top of the adjustment plate (4). Nuts (20) are screwed onto the top ends of the guide shafts (19) to restrict the guide shafts (19) from disengaging from the radial grooves (15) and the arc grooves (18). When the adjustment plate (4) rotates, it can drive multiple guide shafts (19) to move along multiple arc grooves (18) respectively, and make multiple guide shafts (19) move away from or close to the central shaft (17) simultaneously along multiple radial grooves (15), so that multiple pressure blocks (5) can move to the position where they simultaneously press down on the upper end face of the inner ring of the bearing to be tested (7), or make multiple pressure blocks (5) move to the position where they simultaneously press down on the upper end face of the outer ring of the bearing to be tested (7); a displacement sensor (6) is installed in the inner hole of the central shaft (17). The bottom end of the displacement sensor (6) passes through the adjustment plate (4) and the top plate (3) and extends to the housing (2). When the cylinder piston (11) drives the motor (14), transmission shaft (9), spindle (8) and bearing to be tested (7) to rise synchronously, and makes multiple pressure blocks (5) simultaneously press down on the upper end face of the bearing to be tested (7), the bottom end of the displacement sensor (6) can contact the top end of the spindle (8) and perform measurement. The bearing protrusion measuring device according to claim 1 is characterized in that: The bottom end of the spindle (8) is detachably connected to the top end of the drive shaft (9) via a stepped surface. A method for measuring the bearing protrusion amount according to the measuring device of claim 1, characterized in that, Includes the following steps: Step 1: Place the bearing to be tested (7) onto the outer arc surface of the top of the mandrel (8), and press the lower end face of the inner ring of the bearing to be tested (7) onto the stepped surface of the top of the mandrel (8). Then, rotate the adjusting disc (4) through the handle (16) to move multiple pressure blocks (5) to a position where they can simultaneously press down and contact the upper end face of the inner ring of the bearing to be tested (7). Step 2: Air is introduced through the air inlet and outlet port (12) on the lower side of the cylinder body (10) and exhausted through the air inlet and outlet port (12) on the upper side, thereby driving the cylinder piston (11) to rise until the upper end face of the inner ring of the bearing under test (7) is in contact with multiple pressure blocks (5). The pressure value of the cylinder is controlled by the measured value of the pressure sensor (13), thereby controlling the bearing under test (7) to be loaded to the measured load. The measured value X1 of the displacement sensor (6) is read. Then, the air inlet and outlet port (12) on the lower side of the cylinder body (10) is exhausted and the air inlet and outlet port (12) on the upper side is introduced, driving the cylinder piston (11) to descend to the initial position. Step 3: Rotate the adjustment disc (4) by the handle (16) to move multiple pressure blocks (5) to a position where they can simultaneously press down on the upper end face of the outer ring of the bearing to be tested (7). Then, raise the cylinder piston (11) again until the upper end face of the outer ring of the bearing to be tested (7) is in contact with multiple pressure blocks (5). Control the pressure value of the cylinder by the measurement value of the pressure sensor (13) to control the bearing to be tested (7) to be loaded to the measurement load. Then start the motor (14) to drive the transmission shaft (9), spindle (8) and inner ring of the bearing to be tested (7) to rotate. Read the measurement value X2 of the displacement sensor (6) and calculate X1-X2 to obtain the protrusion of the bearing to be tested (7). A method for measuring bearing protrusion according to claim 3, characterized in that: In step 2, when reading the measured value X1 of the displacement sensor (6), X1 is set to 0. In step 3, the measured value X2 of the displacement sensor (6) is the protrusion of the bearing (7) to be tested.

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