CN110726503A - Micro-torque real-time automatic testing device - Google Patents
Micro-torque real-time automatic testing device Download PDFInfo
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- CN110726503A CN110726503A CN201911148086.1A CN201911148086A CN110726503A CN 110726503 A CN110726503 A CN 110726503A CN 201911148086 A CN201911148086 A CN 201911148086A CN 110726503 A CN110726503 A CN 110726503A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0009—Force sensors associated with a bearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to a real-time automatic testing device for micro torque, which comprises a rack, a bearing clamp, a torque sensor, a lifting assembly and a clamping assembly, wherein the lifting assembly and the clamping assembly are respectively and fixedly connected to the rack through a backup plate, and are respectively positioned at the upper part and the lower part of the backup plate; the lifting assembly is fixedly connected with a servo motor and a speed reducer through a lifting support, the speed reducer is connected with the torque sensor in series through a flexible coupling, an upper pressing plate of the bearing clamp is installed on the clamping assembly, a lower pressing plate of the bearing clamp is fixed on the rack, and a load sensor is installed at the bottom of the lower pressing plate. Aiming at the complex requirement of the bearing no-load starting torque automatic test, the invention introduces the technologies of a high-precision torque sensor, a load sensor, a torque servo driver, a bearing clamping fixture and the like, determines quantitative parameters in the test process, establishes a test automatic control system and meets the requirements of quantitative control and automatic control in the test process.
Description
Technical Field
The invention relates to a micro-torque testing technology, in particular to a joint bearing no-load starting torque real-time automatic testing device.
Background
The starting torque value of the oscillating bearing is small, generally between 0.01Nm and 0.2Nm, and at present, common methods for measuring the no-load starting friction torque of the self-lubricating oscillating bearing in actual production mainly comprise a weight method and a measuring method based on a torque sensor.
The measuring principle of the weight method is shown in figure 1, the measuring device of the weight method is simple and low in precision, radial load is applied to the bearing while the weight is loaded, and the no-load state of the bearing is changed. In addition, the order of loading weights, the stability during placement and the last loading amount all have great influence on the test result, and the random error is too large.
The schematic diagram of the tester based on the torque sensor is shown in fig. 2, and the additional radial load and the human influence factor of an operator caused by the test can be avoided by using the torque sensor for measurement. The outer ring of the bearing to be measured is fixed by a clamping device, and the inner ring of the bearing is connected with the motor through a torque sensor. The torque sensor can detect the torque in the starting process of the motor, so that the unloaded starting torque of the detected bearing is measured.
Because the outer ring of the bearing is thin and easy to deform, the pre-tightening state of the bearing is inevitably changed when the outer ring is fixed, and then the no-load starting torque of the bearing is changed.
The 'rolling bearing no-load starting torque measuring device' applied by the forest crystal and the like adopts a vertical structure of a torque sensor, so that the two defects are effectively avoided, the fixation between the inner ring and the mandrel is realized through the interference fit between the tapered mandrel and the inner ring, the problem of introducing axial force in the measuring process is avoided, and the damage to the inner ring of the bearing caused by the screwing of the nut is avoided. Different from a rolling bearing, the clamping of the end face of the joint bearing has higher requirement on the axial clamping force, the axial force cannot be quantitatively controlled, and no-load starting cannot be ensured.
Disclosure of Invention
The invention aims to provide a real-time automatic testing device for micro torque, which introduces technologies such as a high-precision torque sensor, a load sensor, a torque servo driver, a bearing clamping fixture and the like aiming at the complex requirement of the automatic test of the no-load starting torque of a bearing, determines quantitative parameters in the test process, establishes an automatic test control system and meets the requirements of quantitative control and automatic control in the test process.
In order to achieve the purpose, the technical scheme of the invention is as follows: a real-time automatic testing device for micro torque comprises a rack, a bearing clamp, a torque sensor, a lifting assembly and a clamping assembly, wherein the lifting assembly and the clamping assembly are respectively and fixedly connected to the rack through a backup plate, and are respectively positioned at the upper part and the lower part of the backup plate; the lifting assembly is fixedly connected with a servo motor and a speed reducer through a lifting support, the speed reducer is connected with the torque sensor in series through a flexible coupling, an upper pressing plate of the bearing clamp is installed on the clamping assembly, a lower pressing plate of the bearing clamp is fixed on the rack, and a load sensor is installed at the bottom of the lower pressing plate.
Furthermore, the contact surfaces of the upper pressing plate and the lower pressing plate and the tested knuckle bearing adopt arc contact surfaces, and the center of the tested knuckle bearing can be automatically aligned through the arc contact surfaces, so that the influence caused by the coaxiality of the upper pressing plate and the lower pressing plate can be greatly reduced.
Furthermore, the lifting assembly and the clamping assembly are both composed of a driving motor, a ball screw, a screw nut and a guide rail pair, the driving motor is connected with the screw nut through the ball screw, the screw nut is connected with a lifting support or an upper pressing plate, and the lifting support or the upper pressing plate is connected with the guide rail pair.
Furthermore, the clamping assembly adopts a driving motor, a ball screw and a screw nut to drive an upper pressing plate of the bearing clamp to move up and down, axial clamping of the tested joint bearing is realized through the upper pressing plate and the lower pressing plate with arc contact surfaces, a load sensor is further arranged at the bottom of the lower pressing plate, the size of the clamping force is displayed in real time through the load sensor, and the size of the clamping force can be adjusted according to the type of the tested joint bearing, so that the real 'no-load' starting is ensured.
Furthermore, the torque sensor is connected with the tested knuckle bearing in a vertical connection mode, so that the connection direction of the torque sensor is the same as the gravity direction and is perpendicular to the horizontal plane, and extra bending moment influence cannot be generated.
Further, the bottom of frame is fixed on the marble bottom plate, be equipped with the protection casing above the frame for reduce the influence of external environment to the test.
Furthermore, the control precision of the driving angles of the servo motor and the speed reducer is +/-0.01 degrees, and the precision of the torque sensor is +/-0.05% FS.
Furthermore, the real-time automatic testing device for the micro-torque is connected with a control system, the control system realizes automatic control, and a torque-time curve in the test process is output in real time.
The invention has the beneficial effects that:
1. the micro-torque real-time automatic testing device has the advantages that the torque sensor can be calibrated, the testing precision is high, and the device is accurate and reliable;
2. the real-time automatic testing device for the tiny torque can be calibrated on site, is convenient to use, is driven by a servo motor and a speed reducer, has the angle control precision of +/-0.01 degrees, is stable in torque loading, and has the torque sensor precision of +/-0.05 percent FS;
3. the micro-torque real-time automatic testing device has the advantages that the outer ring is axially clamped, the clamping load can be quantitatively controlled, the control software can realize automatic control according to the specification, and the torque-time curve can be output in real time in the test process.
Drawings
FIG. 1 is a schematic diagram of a weight method measurement;
FIG. 2 is a schematic view of a torque sensor based tester;
FIG. 3 is a schematic structural diagram of a real-time automatic testing device for micro-torque according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 3, the automatic real-time testing device for micro torque of the present invention comprises a marble bottom plate 1, a frame 2, a servo motor 3, a speed reducer 4, a load sensor 5, a bearing clamp 6, a torque sensor 7, a flexible coupling 8, a lifting assembly 9, a clamping assembly 10, a protective cover 11, etc.
The basic working principle of the testing device is that a high-precision torque sensor is connected with a joint bearing in series, a servo driver is used for loading, the output data of the high-precision torque sensor is used as the starting torque of the joint bearing, the device adopts a design mode that the high-precision torque sensor is vertically connected with the joint bearing to be tested, the connecting direction of a torque sensor connecting system is the same as the gravity direction and is perpendicular to the horizontal plane, and the connecting mode cannot generate extra bending moment influence.
The frame 2 is installed on the marble bottom plate 1, and the lifting component 9 and the clamping component 10 are fixed by a backup plate, and the lifting component 9 and the clamping component 10 are respectively positioned at the upper part and the lower part of the backup plate. The lifting assembly 9 is fixedly connected with the servo motor 3 and the speed reducer 4 through a lifting support, the speed reducer 4 and the torque sensor 5 are connected in series through a flexible coupling 8, an upper pressing plate 6-1 of the bearing clamp 6 is installed on the clamping assembly 10, a lower pressing plate 6-2 of the bearing clamp 6 is fixed on the rack 2, the load sensor 5 is installed at the bottom of the lower pressing plate 6-2, and the upper pressing plate 6-1 and the lower pressing plate 6-2 are in fillet contact, so that the center can be automatically aligned, and the influence caused by coaxiality is greatly reduced. The lifting assembly 9 and the clamping assembly 10 are composed of a driving motor, a ball screw, a screw nut and a guide rail pair, the driving motor is connected with the screw nut through the ball screw, the screw nut is connected with a lifting support or an upper pressing plate 6-1, and the lifting support or the upper pressing plate 6-1 is connected with the guide rail pair.
Before the test is started, a driving motor of the lifting assembly 9 is started to lift a lifting support in the lifting assembly 9, the servo motor 3, the speed reducer 4 and the flexible coupling 8 are driven to lift together, the knuckle bearing is placed between an upper pressing plate 6-1 and a lower pressing plate 6-2 of the bearing clamp 6, the driving motor of the clamping assembly 10 is started to move the upper pressing plate 6-1 of the clamping assembly 10 downwards to load the knuckle bearing, the knuckle bearing is clamped according to the test requirement of the knuckle bearing after the installation is finished, then the lifting support of the lifting assembly 9 descends, the flexible coupling 8 is connected with the torque sensor 5, and the servo motor 3 is started to rotate.
The clamping component 10 of the invention adopts a driving motor, a ball screw and a screw nut to drive an upper pressing plate 6-1 of a bearing clamp 6 to move up and down, the upper pressing plate 6-1 and a lower pressing plate 6-2 with R fillets are used for axially clamping a tested joint bearing, a load sensor is arranged at the bottom of the lower pressing plate 6-2 to display the clamping force in real time, and the clamping force can be adjusted according to the type of the tested joint bearing, thereby ensuring the 'no-load' starting.
The invention adopts the marble bottom plate fixed at the bottom, the frame is fixed on the marble bottom plate, the lifting component is arranged on the frame, convenience is provided for replacing different joint bearings, the torque loading is realized by the servo motor and the speed reducer, the torque sensor is connected by the flexible coupling, the axial load is applied to the joint bearing by the clamping component to realize quantitative clamping, and the influence of the external environment on the test is reduced by the protective cover.
Claims (8)
1. The utility model provides a real-time automatic testing arrangement of little moment of torsion, includes frame, bearing anchor clamps, torque sensor, lifting unit, clamping components, its characterized in that: the lifting assembly and the clamping assembly are respectively fixedly connected to the rack through a backup plate and are respectively positioned at the upper part and the lower part of the backup plate; the lifting assembly is fixedly connected with a servo motor and a speed reducer through a lifting support, the speed reducer is connected with the torque sensor in series through a flexible coupling, an upper pressing plate of the bearing clamp is installed on the clamping assembly, a lower pressing plate of the bearing clamp is fixed on the rack, and a load sensor is installed at the bottom of the lower pressing plate.
2. The device for real-time automatic testing of minute torque according to claim 1, wherein: the contact surfaces of the upper pressing plate and the lower pressing plate and the tested knuckle bearing adopt arc contact surfaces, and the center of the tested knuckle bearing can be automatically aligned through the arc contact surfaces, so that the influence caused by the coaxiality of the upper pressing plate and the lower pressing plate can be greatly reduced.
3. The device for real-time automatic testing of minute torque according to claim 1, wherein: the lifting assembly and the clamping assembly are composed of a driving motor, a ball screw, a screw nut and a guide rail pair, the driving motor is connected with the screw nut through the ball screw, the screw nut is connected with a lifting support or an upper pressing plate, and the lifting support or the upper pressing plate is connected with the guide rail pair.
4. The device for real-time automatic testing of minute torque according to claim 3, wherein: the clamping assembly drives an upper pressing plate of the bearing clamp to move up and down by adopting a driving motor, a ball screw and a screw nut, axial clamping of the tested joint bearing is realized through the upper pressing plate and the lower pressing plate with arc contact surfaces, a load sensor is further arranged at the bottom of the lower pressing plate, the clamping force is displayed in real time through the load sensor, the clamping force can be adjusted according to the type of the tested joint bearing, and the 'no-load' starting is ensured.
5. The device for real-time automatic testing of minute torque according to claim 1, wherein: the torque sensor is connected with the tested joint bearing in a vertical connection mode, so that the connection direction of the torque sensor is the same as the gravity direction and is perpendicular to the horizontal plane, and additional bending moment influence cannot be generated.
6. The device for real-time automatic testing of minute torque according to claim 1, wherein: the bottom of frame is fixed on the marble bottom plate, be equipped with the protection casing above the frame for reduce the influence of external environment to the test.
7. The device for real-time automatic testing of minute torque according to claim 1, wherein: the control precision of the driving angles of the servo motor and the speed reducer is +/-0.01 degrees, and the precision of the torque sensor is +/-0.05% FS.
8. The minute torque real-time automatic test device according to any one of claims 1 to 7, characterized in that: the real-time automatic testing device for the micro torque is connected with the control system, the control system realizes automatic control, and a torque-time curve in the test process is output in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911148086.1A CN110726503A (en) | 2019-11-21 | 2019-11-21 | Micro-torque real-time automatic testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911148086.1A CN110726503A (en) | 2019-11-21 | 2019-11-21 | Micro-torque real-time automatic testing device |
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| Publication Number | Publication Date |
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| CN110726503A true CN110726503A (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911148086.1A Pending CN110726503A (en) | 2019-11-21 | 2019-11-21 | Micro-torque real-time automatic testing device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855206A (en) * | 2020-08-15 | 2020-10-30 | 温岭市微米自动化设备有限公司 | Bearing fatigue detection equipment and detection method thereof |
| CN113202862A (en) * | 2021-05-08 | 2021-08-03 | 清华大学 | Joint bearing |
| CN114310700A (en) * | 2021-12-08 | 2022-04-12 | 中航西安飞机工业集团股份有限公司 | Clamping device for measuring joint bearing no-load starting torque and using method |
-
2019
- 2019-11-21 CN CN201911148086.1A patent/CN110726503A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855206A (en) * | 2020-08-15 | 2020-10-30 | 温岭市微米自动化设备有限公司 | Bearing fatigue detection equipment and detection method thereof |
| CN113202862A (en) * | 2021-05-08 | 2021-08-03 | 清华大学 | Joint bearing |
| CN113202862B (en) * | 2021-05-08 | 2022-08-02 | 清华大学 | Joint bearing |
| CN114310700A (en) * | 2021-12-08 | 2022-04-12 | 中航西安飞机工业集团股份有限公司 | Clamping device for measuring joint bearing no-load starting torque and using method |
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