CN102928226B - Back-to-back paired installation angular contact ball bearing parameter combination measuring device - Google Patents

Abstract

The invention provides a back-to-back pair mounted angular contact ball bearing parameter combined measuring device to overcome the uncertainty and blindness of the existing manual calibration process. The device is composed of three parts: a pulling and sensing mechanism, a transmission and rotational friction torque measuring mechanism, and a bearing mounting base. The tensioning and sensing detection mechanism is connected by a column and installed on the rolling linear guide pair of the bearing installation base, and its position is determined by the positioning block, stroke limit block, and rear limit block; the transmission and rotation friction torque measurement mechanism is installed through the motor base On the base of the bearing installation base part, the pull sleeve and the inner ring of the bearing in the bearing installation base are driven to rotate through the coupling and the transmission rod to measure the rotational friction torque. The present invention can accurately determine the values of the pretightening force, relative displacement and rotational friction moment of the angular contact ball bearings installed in pairs under certain shafting accuracy and actual lubrication conditions.

Description

Combination measuring device for back-to-back installation of angular contact ball bearing parameters

technical field

The invention relates to a device for measuring parameters of angular contact ball bearings, in particular to a device for measuring pretightening force, relative displacement and rotational friction torque of angular contact ball bearings installed in pairs back to back.

Background technique

In the installation process of precision shafting, the installation of diagonal angular contact ball bearings is very important and is the main factor affecting the accuracy of the entire shafting. The classic installation methods of diagonal angular contact ball bearings can be divided into two categories: face-to-face pair installation and back-to-back pair installation.

The relationship between the preload and relative displacement of angular contact ball bearings installed in pairs is: the greater the bearing preload, the greater the relative displacement, and at this time the greater the rotational friction torque, and the higher the accuracy of the shafting, on the contrary The same is true. However, too much friction torque will bring difficulties to servo control, which in turn will affect the control accuracy of the entire shafting.

Therefore, in the process of adjusting the precision shafting, it is necessary to optimize the matching of the bearing preload, relative displacement and rotational friction torque according to the requirements of the shafting accuracy.

In the process of traditional precision shafting installation and adjustment, the relative displacement is only determined based on the experience of the operator, and then under this relative displacement, one of the bearing pretightening force, rotational friction torque, and shafting accuracy cannot meet the requirements, resulting in assembly and adjustment problems. The work is reworked many times, and in the end, it is easy to cause damage to the parts during the rework and disassembly process of the shafting, which will affect the accuracy of the shafting and greatly delay the assembly and adjustment period of the shafting.

Contents of the invention

The invention provides a back-to-back installation paired angular contact ball bearing parameter combination measurement device to overcome the uncertainty and blindness of the existing manual calibration process, in order to accurately measure the bearings under certain shafting accuracy and actual lubrication conditions Determine the values of pretightening force, relative displacement and rotational friction moment of angular contact ball bearings installed in pairs to meet the technical problems of high-precision shafting assembly and adjustment.

In order to achieve the above object of the invention, the present invention proposes the following solutions.

Install back-to-back pairs of angular contact ball bearing parameter combination measurement devices, which are composed of three parts: tensioning and sensing detection mechanism, transmission and rotation friction torque measurement mechanism, and bearing installation base;

The bearing installation base includes a base, a positioning seat arranged in sequence above the base, a split pressure plate, a bearing inner ring tensioning assembly, a split pulling plate and an upper bearing cup; the bearing inner ring tensioning assembly is vertically In the direction, the inner ring of the upper bearing and the inner ring of the lower bearing of the paired angular contact ball bearing to be tested are tightened and fixed; the outer ring of the lower bearing is fixedly installed on the base through the positioning seat, and the split type The pressure plate is pressed tightly; the upper bearing is installed in the upper bearing cup, and is tightened by the joint action of the upper bearing cup and the split pull plate located at the lower end of the upper bearing; a rolling linear guide pair is installed on the base outside the positioning seat , near the two ends of the rolling linear guide pair, the positioning block and the rear limit block are respectively fixed on the base, and the suitable travel limit block is sleeved on the rolling linear guide rail pair;

The pulling and sensing mechanism includes a hand wheel, a hand wheel mounting frame, a connecting plate, a disc-shaped tension and pressure sensor, a pull nail and a pull plate arranged sequentially from top to bottom. The bearing cup is fixedly connected; on one side of the handwheel mounting frame, there is fixedly provided a guide column that is slidably adapted to the connecting plate and is used for guiding in the vertical direction; The column fixedly connected to the guide column is provided with a grating ruler parallel to the guide column; the bottom of the column is fixedly connected to the rolling linear guide pair and the travel limit block;

The transmission and rotation friction torque measurement mechanism includes a frequency conversion motor, a bellows coupling, a non-contact torque sensor, a coupling and a transmission rod connected sequentially from bottom to top, wherein the frequency conversion motor and the non-contact torque sensor The motor seat is fixed to the base, both ends of the transmission rod are fixedly connected with the tension sleeve, and the upper part of the coupling is clamped and matched with the middle part of the transmission rod.

Based on the above-mentioned basic technical scheme, the present invention also has the following optimization limitations and improvements:

The above bearing inner ring tensioning assembly includes an inner spacer, a flange and a tension sleeve, the inner spacer is located between the upper and lower bearings, and the flange and the tension sleeve are vertically aligned with the upper bearing inner ring and the lower bearing. The ring is tight as a whole.

A transmission shaft and a locking cam for locking the column are arranged between the bottom of the column and the travel limit block.

Using the back-to-back paired installation angular contact ball bearings combined measuring device for pretightening force, relative displacement and rotational friction torque of the present invention can accurately determine the paired installation angular contact ball bearings under certain shafting precision and actual lubrication conditions The values of pretightening force, relative displacement and rotational friction torque provide accurate and quantitative calibration standards for the calibration of precision shafting, overcoming the uncertainty and blindness of the existing manual calibration process.

The measuring device is also applicable to the measurement of bearings of different specifications, and only needs to change the specifications of the upper bearing cup, positioning seat, pull sleeve, inner spacer and flange according to the specifications of the bearing.

Description of drawings

Fig. 1 is a structural representation of the present invention (external whole);

Fig. 2 is a schematic cross-sectional view of the left view of Fig. 1;

Fig. 3 is a cross-sectional view of the connection part between the column and the bearing mounting base in Fig. 1 along the direction A.

FIG. 4 is a cross-sectional view of FIG. 3 along direction B.

Explanation of reference numbers:

1. Base; 2. Rear limit block; 3. Rolling linear guide pair; 4. Positioning block; 5. Travel limit block; 6. Column; 7. Grating ruler; 8. Guide column; 9. Handwheel; 10 .Trapezoidal screw; 11. Connecting plate; 12. Disc tension and pressure sensor; 13. Pull nail; 14. Pull plate; 15. Upper bearing cup; 16. Split pull plate; 17. Split press plate; 18 .Positioning seat; 19. Coupling; 20. Non-contact torque sensor; 21. Bellows coupling; 22. Frequency conversion motor; 23. Motor seat; 24. Transmission rod; 25. Lower bearing; 26. Inner Spacer; 27. Upper bearing; 28. Pull sleeve; 29. Flange; 30. Lower thrust bearing; 31. Upper thrust bearing; 32. Trapezoidal nut; 33. Locking handle; 34. Transmission shaft; 35. Lock Tight cam; 36. Flat key.

Detailed ways

As shown in Fig. 1-Fig. 4, the combined measurement device for back-to-back angular contact ball bearings installed in pairs in accordance with the present invention consists of a pull and sensor detection mechanism, a bearing mounting base, The transmission and rotation friction torque measuring mechanism consists of three parts.

The pulling and sensing detection mechanism is connected and installed on the rolling linear guide rail pair 3 of the bearing installation base by the column 6, and can move along the rolling linear guide rail pair, and its position is determined by the positioning block 4, the travel limit block 5, and the rear limit block 2. Position, to adapt to the measurement of bearings of different specifications; the transmission and rotation friction torque measurement mechanism is installed on the base 1 in the bearing installation base part through the motor base 23, and the pull in the bearing installation base is driven by the coupling 19 and the transmission rod 24 The sleeve 28 and the inner ring of the bearing rotate to measure the rotational friction torque.

The main components of the pulling and sensing mechanism include: column 6, grating ruler 7, guide column 8, hand wheel 9, trapezoidal screw 10, trapezoidal nut 32, upper thrust bearing 31, connecting plate 11, lower thrust bearing 30. Disc-shaped tension and pressure sensor 12, pull stud 13, pull plate 14, locking handwheel 33, transmission shaft 34, locking cam 35.

The main components of the bearing installation base include: base 1, rolling linear guide pair 3, rear limit block 2, positioning block 4, stroke limit block 5, positioning seat 18, split pressure plate 17, inner spacer sleeve 26, Shi pull cover 28, flange 29, split type drawing plate 16, upper bearing cup 15.

The main components included in the transmission and rotation friction torque measuring mechanism are: motor base 23 , variable frequency motor 22 , bellows coupling 21 , non-contact torque sensor 20 , coupling 19 , and transmission rod 24 .

Working principle of the present invention:

When measuring, a pair of angular contact bearings are fixed by the tension sleeve 28, the inner spacer 26, and the flange 29; that is, the inner spacer 26 is located between the upper and lower bearings, and the flange 29 and the tension sleeve 28 In the vertical direction, the inner ring of the upper bearing and the inner ring of the lower bearing are integrally tightened. Install the outer ring of the lower bearing 25 on the positioning seat 18, and press it with the split pressure plate 17; install the upper bearing 27 in the upper bearing cup 15, and press it with the split pull plate 16; the positioning seat 18 is installed on the base 1 on.

Push the pulling and relative displacement measuring part along the rolling linear guide pair 3 to the position determined by the positioning block 4, turn the locking hand wheel 33, and the driving shaft 34 drives the locking cam 35 to fix the pulling and sensing detection mechanism on the Roll on the linear guide pair 3. The upper bearing cup 15 is connected with the pulling disc 14 in the pulling and sensing mechanism. Rotate the hand wheel 9 to drive the connecting plate 11 to move upwards along the guide column 8, pull the disc-shaped tension and pressure sensor 12, the pull nail 13, the pull plate 14 in turn, and then pull up the outer ring of the upper bearing 27, and then transmit it to the upper bearing 27 to the lower Bearing 25 inner rings, lower bearing 25 outer rings are fixed with base 1 by positioning seat 18. Then, under the pulling force of the hand wheel 9, the inner and outer rings of the bearing produce relative displacement. The pretightening force exerted by the hand wheel 9 on the back-to-back paired angular contact ball bearings can be read from the disc-shaped pull-pressure sensor 12, and the inner and outer sides of the back-to-back paired angular contact ball bearings can be read from the grating ruler 7. The relative displacement generated by the ring, so as to determine the relationship between the preload and the relative displacement, guide the precision shafting calibration.

Under certain pretightening force and bearing lubrication conditions, the variable frequency motor 22 installed on the motor base 23 drives the bellows type coupling 21, the non-contact torque sensor 20, the coupling 19, and the transmission rod 24, and the transmission rod 24. Turn the pull sleeve 28 and the flange 29 to drive the inner ring of the bearing to rotate. The variable-frequency motor rotates at a constant speed, and the non-contact torque sensor 20 can read the rotational friction torque of the back-to-back angular contact ball bearings installed in pairs under certain pretightening force and bearing lubrication conditions.

After the measurement, loosen the connection between the pulling plate 14 and the upper bearing cup 15, turn the locking handwheel 33 in the opposite direction, and the locking cam 35 is driven by the transmission shaft 34, and the pulling and sensing detection mechanism and the rolling linear guide rail pair 3 Loosen, push the pull and sensor detection mechanism along the rolling linear guide rail, and then disassemble each component in sequence.

Claims (3)

1. The angular contact ball bearing parameter combination measuring device is installed back to back in pairs, which is characterized in that it is composed of three parts: the pulling and sensing detection mechanism, the transmission and rotation friction torque measurement mechanism, and the bearing installation base; The bearing installation base includes a base (1), a positioning seat (18) arranged in sequence above the base, a split pressure plate (17), a bearing inner ring tensioning assembly, a split pull plate (16) and an upper bearing cup (15); the bearing inner ring tightening assembly tightens and fixes the upper bearing inner ring and the lower bearing inner ring of the paired angular contact ball bearing to be measured in the vertical direction; the lower bearing (25) outer ring passes through the The positioning seat (18) is fixedly installed on the base (1), and is pressed by the split pressure plate (17) located at the upper end of the lower bearing; the upper bearing (27) is installed in the upper bearing cup (15), and is pressed by the upper bearing cup (15). The cup (15) and the split pull plate (16) located at the lower end of the upper bearing work together to tighten; the outer side of the positioning seat (18) is equipped with a rolling linear guide pair (3) on the base (1), close to The two ends of the rolling linear guide pair (3) are respectively fixed with a positioning block (4) and a rear limit block (2) on the base, and an adapted travel limit block ( 5); The pulling and sensing detection mechanism includes a hand wheel (9), a hand wheel mounting frame, a connecting plate (11), a disc-shaped tension and pressure sensor (12), a pull nail (13) and a pull screw (13) arranged sequentially from top to bottom. disc (14), the pulling disc (14) is fixedly connected with the upper bearing cup (15) located at its lower end; on the side of the handwheel mounting frame, there is fixedly provided with a sliding fit with the connecting plate (11) for The guide column (8) that guides along the vertical direction; The column (6) that is fixedly connected with the handwheel mounting bracket and the guide column (8) is set on the outside of the guide column, and the column (6) is provided with the A grating ruler (7) parallel to the guide column (8); the bottom of the column (6) is fixedly connected with the rolling linear guide pair (3) and the stroke limit block (5); The transmission and rotation friction torque measurement mechanism includes a frequency conversion motor (22), a bellows coupling (21), a non-contact torque sensor (20), a shaft coupling (19) and a transmission connection from bottom to top. The transmission rod (24), wherein the variable frequency motor (22) and the non-contact torque sensor (20) are fixed to the base (1) through the motor seat (23), and the two ends of the transmission rod are fixedly connected with the pull sleeve (28), The upper part of the shaft coupling (19) is snap-engaged with the middle part of the drive rod (24). 2. The back-to-back paired installation angular contact ball bearing parameter combination measuring device according to claim 1, characterized in that: the bearing inner ring tensioning assembly includes an inner spacer (26), a flange (29) and a tensioning Cover (28), inner spacer sleeve (26) is positioned between upper and lower bearing, and flange (29) and tension sleeve (28) are tightened integrally to upper bearing inner ring and lower bearing inner ring in vertical direction. 3. The back-to-back paired installation angular contact ball bearing parameter combination measuring device according to claim 1, characterized in that: between the bottom of the column (6) and the travel limit block (5), there is a locking column Drive shaft (34) and locking cam (35).