CN114152382B - Axial loading-based ball screw pair friction moment measuring device and method - Google Patents
Axial loading-based ball screw pair friction moment measuring device and method Download PDFInfo
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- CN114152382B CN114152382B CN202111469960.9A CN202111469960A CN114152382B CN 114152382 B CN114152382 B CN 114152382B CN 202111469960 A CN202111469960 A CN 202111469960A CN 114152382 B CN114152382 B CN 114152382B
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- 238000005259 measurement Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 230000013011 mating Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
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Classifications
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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
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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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
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Abstract
The invention provides a device and a method for measuring friction torque of a ball screw pair based on axial loading, wherein the device comprises an experiment table, a first working table plate, a first matching structure, a second working table plate, a ball screw, a giant magnetostrictive actuator, a radial bearing, a second matching structure, a first pressure sensor, a second pressure sensor and a third pressure sensor; according to the invention, the giant magnetostrictive actuator is controlled to extend or shorten through current, different axial loads are applied, and the measurement of friction moment under the loading working condition of the ball screw pair and the measurement of friction moment under the different axial loading working conditions can be realized; the change of the pre-tightening force of the loaded ball screw pair can be reflected from the side surface, and the method has important significance in guiding the design and assembly of the ball screw pair and improving the transmission precision of the ball screw pair.
Description
Technical Field
The invention belongs to the technical field of ball screws, and particularly relates to a device and a method for measuring friction torque of a ball screw pair based on axial loading.
Background
The ball screw pair is used as an important precise transmission functional component in the industrial fields of mechanical equipment, intelligent numerical control machining centers, aerospace and the like, and the quality of the ball screw pair directly determines the quality of the intelligent equipment; the index for evaluating the quality of the ball screw pair is many, wherein the friction moment indirectly reflects the pretightening force of the ball screw pair and the ball fluency, and has important influence on the transmission stability of the ball screw pair.
The inventor finds that the ball screw pair friction torque measurement method is usually carried out in an idle state and cannot reflect the influence of load working conditions on the transmission stability of the ball screw pair friction torque measurement method; moreover, the conventional ball screw friction force measuring device cannot measure the friction moment under the axial load working condition.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for measuring the friction torque of a ball screw pair based on axial loading, which can realize the measurement of the friction torque of the ball screw pair under the loading working condition and the measurement of the friction torque under different axial loading working conditions; has important significance for guiding the design and assembly of the ball screw pair and improving the transmission precision of the ball screw pair.
In order to achieve the above object, in a first aspect, the present invention provides a ball screw pair friction torque measurement device based on axial loading, which adopts the following technical scheme:
The ball screw pair friction torque measuring device based on axial loading comprises an experiment table, a first working table plate, a first matching structure, a second working table plate, a ball screw, a giant magnetostrictive actuator, a radial bearing, a second matching structure, a first pressure sensor, a second pressure sensor and a third pressure sensor;
The first workbench plate and the first matching structure are arranged on the experiment table in a sliding manner through a guide rail pair; the first working table plate is connected with the ball screw through the first matching structure; the outer ring of the radial bearing is fixed with the second working table plate, and the inner ring of the radial bearing is fixed with the ball screw;
One end of the giant magnetostrictive actuator is fixed with the side surface of the first working table plate, and the other end of the giant magnetostrictive actuator is fixed with the outer ring of the radial bearing; the ball screw is also provided with a second matching structure, and the third pressure sensor is arranged between the second matching structure and the radial bearing;
The second cooperation structure is provided with first driving lever and second driving lever in circumference symmetry, on the second work platen with first driving lever with second driving lever corresponds the department is provided with first pressure sensor and second pressure sensor.
Further, one end of the ball screw, which is close to the first working table plate, is connected with a motor through a coupler.
Further, a torque measuring instrument is arranged between the coupler and the ball screw.
Further, the two ends of the ball screw are also provided with a first bearing and a second bearing.
Further, the first matching structure comprises a first working nut, a first pre-tightening gasket and a first pre-tightening nut;
the first working nut is fixedly connected with the first working table plate, and the first working nut, the first pre-tightening gasket and the first pre-tightening nut are sequentially connected through keys.
Further, the second mating structure is not connected to the second work deck;
The second matching structure comprises a second working nut, a second pre-tightening gasket and a second pre-tightening nut; the second working nut, the second pre-tightening gasket and the second pre-tightening nut are sequentially connected through keys.
Further, the giant magnetostrictive actuator is fixed on the side surface of the first working table plate through a connecting rod.
Further, the radial bearing is arranged as a bearing which can relatively move in the axial direction of the inner ring and the outer ring.
Furthermore, a grating ruler is further arranged on the experiment table, and the grating ruler is parallel to the ball screw.
In order to achieve the above purpose, in a second aspect, the present invention further provides a method for measuring a friction torque of a ball screw pair based on axial loading, which adopts the following technical scheme:
the axial loading-based ball screw pair friction torque measuring method adopts the axial loading-based ball screw pair friction torque measuring device according to the first aspect, and comprises the following steps:
Different axial loads are applied through the extension or shortening of the giant magnetostrictive transducer, the third pressure sensor detects the axial pressure, and the positioning accuracy of the different axial loads is measured through the grating ruler;
the second working nut, the second pre-tightening gasket and the second matching mechanism of the second pre-tightening nut rotate along with the ball screw, and the first deflector rod or the second rod extrudes the first pressure sensor or the second pressure sensor to obtain the friction moment of the second matching mechanism under different axial load working conditions.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, the giant magnetostrictive actuator is controlled to extend or shorten through current, different axial loads are applied, and the measurement of friction moment under the loading working condition of the ball screw pair and the measurement of friction moment under the different axial loading working conditions can be realized; the change of the pre-tightening force of the loaded ball screw pair can be reflected from the side surface, and the method has important significance in guiding the design and assembly of the ball screw pair and improving the transmission precision of the ball screw pair.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate and explain the embodiments and together with the description serve to explain the embodiments.
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic illustration of the positions of a lever and a pressure sensor according to embodiment 1 of the present invention;
The device comprises a motor 1, a motor 2, a coupler 3, a first bearing 4, a grating ruler 5, a first working nut 6, a first pre-tightening gasket 7, a first pre-tightening nut 8, a first working table plate 9, a connecting rod 10, a ball screw 11, a giant magnetostrictive device 12, a radial bearing 13, a bearing seat 14, a first deflector rod 15, a first pressure sensor 16, a second working table plate 17, a first guide rail pair 18, a second bearing 19, a second guide rail pair 20, a second working nut 21, a second pre-tightening gasket 22, a second pre-tightening nut 23, a second deflector rod 24, a second pressure sensor 25, a third pressure sensor 26 and a torque measuring instrument.
The specific embodiment is as follows:
the invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1:
as shown in fig. 1, the present embodiment provides a ball screw pair friction torque measuring device based on axial loading, which comprises an experiment table, a first working table plate 8, a first matching structure, a second working table plate 16, a ball screw 10, a giant magnetostrictive actuator 11, a radial bearing 12, a second matching structure, a first pressure sensor 15, a second pressure sensor 24 and a third pressure sensor 25;
The first workbench plate 8 and the first matching structure are arranged on the experiment table in a sliding way through a guide rail pair; the first working table 8 is connected with the ball screw 10 through the first matching structure; an outer ring of the radial bearing 12 is fixed to the second table 20, and an inner ring is fixed to the ball screw 10;
One end of the giant magnetostrictive actuator 11 is fixed with the side surface of the first working table plate 8, and the other end of the giant magnetostrictive actuator is fixed with the outer ring of the radial bearing 12; the ball screw 10 is further provided with a second matching structure, and the third pressure sensor 25 is arranged between the second matching structure and the radial bearing 12;
The second matching structure is provided with a first deflector rod 14 and a second deflector rod 23 symmetrically in the circumferential direction, and the second worktable 16 is provided with a first pressure sensor 15 and a second pressure sensor 24 at positions corresponding to the first deflector rod 14 and the second deflector rod 23;
Specifically, the setting of the experiment table is conventional; the guide rail pair may be configured to include two parallel first guide rail pair 17 and second guide rail pair 19, which may be implemented by conventional slide rails and slide grooves, and will not be described in detail herein;
The first working table plate 8 is connected with the ball screw 10 through a first matching structure, and it can be understood that the first matching structure is fixed on the first working table plate 8, and threads matched with the ball screw 10 are arranged on the first matching structure, so that the arrangement of the ball screw pair is realized.
The outer ring of the radial bearing 12 can be fixed on the second working table plate 20 through a bearing seat 13, and the inner ring can be fixedly connected with the ball screw 10 through interference connection or key connection; the two ends of the giant magnetostrictive device 11 are respectively connected with the first working table plate 8 and the outer ring of the radial bearing 12, and the axial load can be applied through the expansion and the contraction of the giant magnetostrictive device 11.
In this embodiment, the third pressure sensor 25 may be configured as a middle-penetrating pressure sensor, which may be understood to be a ring-shaped pressure sensor, and may be sleeved on the ball screw 10, and may measure an axial pressure between the bearing outer ring and the second mating structure; as shown in fig. 2, the first pressure sensor 15 and the second pressure sensor 24 may be configured as sensors that are subjected to vertical force detection; the arrangement of the sensors is conventional or prior art and will not be described in detail here.
In the embodiment, one end of the ball screw 10, which is close to the first working table plate 8, is connected with a motor 1 through a coupler 2; it will be appreciated that the motor 1 may be fixed to the laboratory bench, in particular in a conventional arrangement, which will not be described in detail here.
In the present embodiment, a torque meter 26 is provided between the coupling 2 and the ball screw 10; the torque meter 26 may be implemented by existing equipment, and the connection manner is a conventional connection manner; the torque meter 26 functions to detect torque.
In this embodiment, the two ends of the ball screw 10 are further provided with a first bearing 3 and a second bearing 18; the ball screw 10 can be reinforced by fixing the bearing inner ring and the ball screw 10 in a key connection or interference connection manner, and fixing the outer ring of the bearing on a laboratory table through a bearing seat and other manufactured settings.
In this embodiment, the first mating structure includes a first working nut 5, a first pre-tightening washer 6, and a first pre-tightening nut 7; the first working nut 5 is fixedly connected with the first working table plate 8, and the first working nut 5, the first pre-tightening gasket 6 and the first pre-tightening nut 7 are sequentially connected through keys;
The first working nut 5 may be fixed on the first working platen 8 by means of a steel plate or a bracket, etc., and the key connection may be implemented by providing key connection holes on the sides of the first working nut 5, the first pre-tightening washer 6 and the first pre-tightening nut 7.
In this embodiment, the second mating structure is not connected to the second work platen 16; the second working nut 20, the second pre-tightening gasket 21 and the second pre-tightening nut 22 form a mechanism which is not connected with the second working table plate 16 (a disconnection state);
The second matching structure comprises a second working nut 20, a second pre-tightening gasket 21 and a second pre-tightening nut 22; the second working nut 20, the second pre-tightening washer 21 and the second pre-tightening nut 22 are also sequentially keyed.
In the present embodiment, the giant magnetostrictive actuator 11 is fixed on the side surface of the first table plate 8 by a connecting rod 9; it will be appreciated that the connecting rod 9 may be provided in a rod shape or in a cylindrical shape and then be fixed to the side surface of the first table plate 8 after being sleeved on the ball screw 10, and when the connecting rod 9 is provided in a cylindrical shape, the inner wall is not in contact with the ball screw 10.
In this embodiment, the radial bearing 12 is configured as a bearing in which the inner ring and the outer ring are axially movable relative to each other, which is not described in detail here.
In this embodiment, the experiment table is further provided with a grating ruler 4, and the grating ruler 4 is parallel to the ball screw 10; the grating ruler 4 can be fixed on the experiment table by means of bolts or glue bonding.
The working principle or process of the embodiment is as follows:
The motor 1 is connected with the torque measuring instrument 26 through the coupler 2, the ball screw 10 rotates to drive the first working table plate 8 to reciprocate on the guide rail pair, and the first working table plate 8 and the first working nut 5 can be connected through a connecting steel plate (steel plate); wherein the first working nut 5, the first pre-tightening nut 7 and the first pre-tightening washer 6 are coupled by a key; also the second working nut 20, the second pre-tightening washer 21 and the second pre-tightening nut 22 are coupled by means of keys; the ball screw 10 is supported by the first bearing and the second bearing; the moving positioning precision of the working table plate can be measured by the grating ruler 4;
The left end of the connecting rod 9 is connected with the first working table plate 8 through a screw, the right end of the first connecting rod 9 is provided with the giant magnetostrictive device 11, the rear end of the giant magnetostrictive device 11 is used for fixing the outer ring of the radial bearing 12, and the outer ring of the radial bearing 12 is connected with the second working table plate 16 through a bearing seat 13 through a bolt; a third pressure sensor 25 is arranged between the bearing seat 13 or the outer ring of the radial bearing 12 and the second pre-tightening nut 20; the second worktable 16 is adhered with the first pressure sensor 15 and the second lower end pressure sensor 24; a second matching mechanism composed of the second working nut 20, the second pre-tightening gasket 21 and the second pre-tightening nut 22 is not connected with the second working table plate 16 (in a disconnection state);
The giant magnetostrictive transducer 11 is the existing equipment, can be controlled to extend or shorten by current, and applies different axial loads, the third pressure sensor 25 can detect the magnitude of the axial pressure, and the positioning accuracy of different axial loads is measured and compared by the grating ruler 4; the second working nut 20, the second pre-tightening gasket 21 and the second pre-tightening nut 22 form the second matching mechanism, which rotates forward or backward along with the ball screw 10, and the first upper deflector rod 14 or the second deflector rod 23 extrudes the first pressure sensor 15 or the second pressure sensor 24, so that the friction moment of the component mechanism under different axial load working conditions is obtained; the radial bearing 12 is not subjected to axial load, the friction moment is negligible, and the torque measuring instrument 26 monitors the change of the torque of the whole system under the load;
In addition, before the giant magnetostrictive actuator 11 is not loaded, the second working nut 20 and the second pre-tightening gasket 21 are in an idle state, and the idle friction moment can be measured; therefore, the embodiment can realize the measurement of the friction moment of the ball screw pair under loading and unloading.
When an axial force is applied, the giant magnetostrictive actuator 11 is controlled to extend or shorten by a controller (the controller is set and selected to be a conventional setting), the extension length is proportional to the electrified current, and the larger the output displacement of the giant magnetostrictive actuator 11 is, the larger the applied axial load is due to the fact that the distance between the first working table 8 and the second working table 16 is fixed during the relative movement; the left end of the giant magnetostrictive actuator 11 is connected with the right end of the connecting rod 9 through a bolt, and the applied load is transferred to the third pressure sensor 25 through a radial bearing and then transferred to a second matching mechanism consisting of the second working nut 20 and the second pre-tightening gasket 21.
As shown in fig. 2, when the screw belt 10 rotates the working nut forward, the second shift lever 23 presses the second pressure sensor 24; when the screw rod belt 10 drives the working nut to rotate reversely, the first deflector rod 14 presses the first pressure sensor 15, and the forward and reverse friction torque of the screw rod pair is obtained by multiplying the calculated force by the force arm.
Example 2:
the embodiment provides a method for measuring friction torque of a ball screw pair based on axial loading, which adopts the device for measuring friction torque of the ball screw pair based on axial loading according to the first aspect, and comprises the following steps:
Different axial loads are applied through the extension or shortening of the giant magnetostrictive transducer, the third pressure sensor detects the axial pressure, and the positioning accuracy of the different axial loads is measured through the grating ruler;
the second working nut, the second pre-tightening gasket and the second matching mechanism of the second pre-tightening nut rotate along with the ball screw, and the first deflector rod or the second rod extrudes the first pressure sensor or the second pressure sensor to obtain the friction moment of the second matching mechanism under different axial load working conditions.
The above description is only a preferred embodiment of the present embodiment, and is not intended to limit the present embodiment, and various modifications and variations can be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (7)
1. The device is characterized by comprising an experiment table, a first working table plate, a first matching structure, a second working table plate, a ball screw, a giant magnetostrictive device, a radial bearing, a second matching structure, a first pressure sensor, a second pressure sensor and a third pressure sensor;
The first workbench plate and the first matching structure are arranged on the experiment table in a sliding manner through a guide rail pair; the first working table plate is connected with the ball screw through the first matching structure; the radial bearing is a bearing with the inner ring and the outer ring capable of relatively moving in the axial direction; the outer ring of the radial bearing is fixed with the second working table plate, and the inner ring of the radial bearing is fixed with the ball screw;
One end of the giant magnetostrictive actuator is fixed with the side surface of the first working table plate, and the other end of the giant magnetostrictive actuator is fixed with the outer ring of the radial bearing; the ball screw is also provided with a second matching structure, and the third pressure sensor is arranged between the second matching structure and the radial bearing; the giant magnetostrictive transducer can be controlled to extend or shorten through current, different axial loads are applied, the third pressure sensor can detect the axial pressure, and the positioning accuracy of the different axial loads is measured and compared through the grating ruler; a first deflector rod and a second deflector rod are symmetrically arranged on the second matching structure in the circumferential direction, and a first pressure sensor and a second pressure sensor are arranged on the second working table plate at positions corresponding to the first deflector rod and the second deflector rod; the first deflector rod extrudes the first pressure sensor, and the second deflector rod extrudes the second pressure sensor, so that the friction moment of the composition mechanism under different axial load working conditions is obtained; the first matching structure comprises a first working nut, a first pre-tightening gasket and a first pre-tightening nut; the first working nut is fixedly connected with the first working table plate, and the first working nut, the first pre-tightening gasket and the first pre-tightening nut are sequentially connected through keys; the second matching structure comprises a second working nut, a second pre-tightening gasket and a second pre-tightening nut; the second working nut, the second pre-tightening gasket and the second pre-tightening nut are sequentially connected through keys;
Before the giant magnetostrictive actuator does not apply load, the second working nut and the second pre-tightening gasket forming mechanism are in an idle state, and can measure the idle friction moment.
2. The axial loading-based ball screw assembly friction torque measuring device according to claim 1, wherein one end of the ball screw, which is close to the first working table plate, is connected with a motor through a coupler.
3. The axial loading-based ball screw assembly friction torque measuring device according to claim 2, wherein a torque measuring instrument is arranged between the coupler and the ball screw.
4. The axial loading-based ball screw assembly friction torque measuring device according to claim 1, wherein the ball screw is further provided with a first bearing and a second bearing at both ends.
5. The axial loading-based ball screw assembly friction torque measuring device according to claim 1, wherein the giant magnetostrictive actuator is fixed on the side surface of the first table plate through a connecting rod.
6. The axial loading-based ball screw pair friction torque measuring device according to claim 1, wherein a grating scale is further arranged on the experiment table, and the grating scale is parallel to the ball screw.
7. The axial loading-based ball screw pair friction torque measuring method is characterized in that the axial loading-based ball screw pair friction torque measuring device according to any one of claims 1-6 is adopted, and the method comprises the following steps:
Different axial loads are applied through the extension or shortening of the giant magnetostrictive transducer, the third pressure sensor detects the axial pressure, and the positioning accuracy of the different axial loads is measured through the grating ruler;
the second working nut, the second pre-tightening gasket and the second matching mechanism of the second pre-tightening nut rotate along with the ball screw, and the first deflector rod or the second rod extrudes the first pressure sensor or the second pressure sensor to obtain the friction moment of the second matching mechanism under different axial load working conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469960.9A CN114152382B (en) | 2021-12-03 | 2021-12-03 | Axial loading-based ball screw pair friction moment measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111469960.9A CN114152382B (en) | 2021-12-03 | 2021-12-03 | Axial loading-based ball screw pair friction moment measuring device and method |
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| CN114152382A CN114152382A (en) | 2022-03-08 |
| CN114152382B true CN114152382B (en) | 2024-04-26 |
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| CN111521392A (en) * | 2020-05-25 | 2020-08-11 | 南京理工大学 | Ball and rolling linear guide rail reverser friction torque detection device |
| CN112649194A (en) * | 2021-01-11 | 2021-04-13 | 山东大学 | Ball screw pair loading test device and test method |
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2021
- 2021-12-03 CN CN202111469960.9A patent/CN114152382B/en active Active
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|---|---|---|---|---|
| CN201021709Y (en) * | 2006-11-29 | 2008-02-13 | 李敬宇 | Ball bearing bolt device and rolling spiral drive device |
| CN101769805A (en) * | 2010-03-02 | 2010-07-07 | 五邑大学 | Test bed for testing friction torque property of double ball screws |
| CN102095541A (en) * | 2010-12-06 | 2011-06-15 | 东南大学 | Experiment table for studying friction mechanism of precision ball screw pair |
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| CN114152382A (en) | 2022-03-08 |
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