CN111811387B - Device for measuring resistance between inner ring and outer ring of bearing in rotating state - Google Patents
Device for measuring resistance between inner ring and outer ring of bearing in rotating state Download PDFInfo
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- CN111811387B CN111811387B CN202010614629.0A CN202010614629A CN111811387B CN 111811387 B CN111811387 B CN 111811387B CN 202010614629 A CN202010614629 A CN 202010614629A CN 111811387 B CN111811387 B CN 111811387B
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- bearing
- shaft sleeve
- driving shaft
- ring
- storage tank
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
- G01B7/144—Measuring play on bearings
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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
Abstract
The device for measuring the resistance between the inner ring and the outer ring of the bearing in the rotating state is based on the bearing, and further comprises a shell and a driving shaft, wherein the shell comprises an upper positioning shell and a lower liquid storage tank, and conductive liquid is arranged in the liquid storage tank; the driving shaft is coaxially fixed in the positioning shell; the bearing is fixed between the driving shaft and the side wall of the positioning shell by arranging the inner shaft sleeve I and the outer shaft sleeve I; the transition bearing is fixed at the lower part of the driving shaft and is immersed in the conductive liquid; the driving shaft synchronously rotates through the rotating motor; the positioning screw penetrates from the outside of the positioning shell to be connected into the first outer shaft sleeve; still include digital multimeter, digital multimeter one end is connected with set screw through testing lead wire, and digital multimeter's the other end is connected with the surface of reservoir. The invention can effectively eliminate the interference influence of the resistance between the inner ring and the outer ring of other bearings which are not the measuring object on the measured value by filling the gaps between the inner ring and the outer ring of other bearings in the measuring device with the conductive liquid.
Description
Technical Field
The invention relates to the technical field of bearing detection, in particular to a device for measuring resistance between an inner ring and an outer ring of a bearing in a rotating state.
Background
The bearing is an important part in modern mechanical equipment, has the main functions of supporting a mechanical rotating body, reducing the friction coefficient in the movement process of the mechanical rotating body and ensuring the rotation precision of the mechanical rotating body, and is widely applied to the field of machinery.
The common bearings are mostly made of metal materials and are composed of an inner ring, an outer ring and a transition part between the inner ring and the outer ring. In general, the angular velocity of the inner ring and the outer ring of the bearing in a rotating state is different, and there is relative motion, and at this time, there is a gap at the transition portion between the inner ring, the outer ring, and the inner ring and the outer ring to some extent. The stability of the gap can reflect the quality of the bearing to a certain extent. A good bearing will have this clearance more stable during rotation than a poor bearing.
The stability of the gap between the inner ring and the outer ring of the bearing in a rotating state can be indirectly reflected by measuring the resistance change rule between the inner ring and the outer ring of the bearing. The smaller the resistance fluctuation is, the better the gap stability is; conversely, the poorer the gap stability.
If the two ends of the wire directly using the measuring resistor are respectively connected with the inner ring and the outer ring of the bearing, the problem of wire winding can occur due to relative motion between the inner ring and the outer ring of the bearing, so that the sustainability of the measuring process is very short. Therefore, a measuring device is needed to be designed, so that both ends of the measuring resistor are connected with a static object, and the winding problem is avoided.
If the resistance between the inner ring and the outer ring of the bearing is to be measured by measuring a stationary object, it is necessary to rotate the other bearing in synchronization with the measured bearing and then measure the resistance between the outer rings of the two bearings. However, the inner ring and the outer ring of the other bearing also have a gap, so that the resistance between the inner ring and the outer ring thereof can have an interfering influence on the measurement result.
Disclosure of Invention
The invention provides a device for measuring the resistance between an inner ring and an outer ring of a bearing in a rotating state, which can solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a measuring device for resistance between an inner ring and an outer ring of a bearing in a rotating state is based on the bearing needing to measure the resistance between the inner ring and the outer ring, and further comprises a shell and a driving shaft, wherein the shell comprises an upper part and a lower part, the upper part is a positioning shell with an opening at the bottom, the lower part is a liquid storage tank with an opening at the top, the positioning shell is placed above the liquid storage tank, and the relative positions of the positioning shell and the liquid storage tank are fixed;
conductive liquid is arranged in the liquid storage tank;
the driving shaft is coaxially fixed in the positioning shell;
the bearing is fixed between the driving shaft and the side wall of the positioning shell by arranging the inner shaft sleeve I and the outer shaft sleeve I;
namely, the inner ring of the bearing is connected with the inner shaft sleeve and fixed on the driving shaft, and the outer ring of the bearing is connected with the outer shaft sleeve and fixed on the inner wall of the positioning shell;
a gap is reserved between the first inner shaft sleeve and the first outer shaft sleeve and is not in direct contact with the first inner shaft sleeve;
the lower half part of the driving shaft is provided with a transition bearing, and the transition bearing is coaxially fixed on the driving shaft;
meanwhile, the transition bearing is immersed in the conductive liquid, namely, an inner ring of the transition bearing is fixed on the driving shaft through the inner shaft sleeve II, and an outer ring of the transition bearing is fixed on the inner wall of the liquid storage tank through the outer shaft sleeve II;
the top of the positioning shell is provided with a rotating motor, and a driving shaft is sleeved on a shaft of the rotating motor and rotates synchronously with the rotating motor;
when the rotating motor rotates, the driving shaft, the first inner shaft sleeve, the second inner shaft sleeve, the inner ring of the bearing and the inner ring of the transition bearing are driven to synchronously rotate;
the positioning screw penetrates from the outside of the positioning shell and is connected into the first outer shaft sleeve;
the first outer shaft sleeve, the driving shaft, the first inner shaft sleeve, the liquid storage tank, the positioning screw transition bearing, the second inner shaft sleeve and the second outer shaft sleeve are all made of conductive metal, and the positioning shell is made of insulating material;
still include digital multimeter, digital multimeter one end is connected with set screw through testing lead wire, and digital multimeter's the other end is connected with the surface of reservoir.
Furthermore, the device also comprises a data acquisition signal line and data acquisition equipment;
the data acquisition equipment is connected with the digital multimeter through a data acquisition signal line.
Furthermore, the inner ring of the bearing, the inner shaft sleeve I and the driving shaft are in interference fit;
and the outer ring of the bearing and the first outer shaft sleeve are in interference fit.
Furthermore, the inner ring of the transition bearing, the inner shaft sleeve II and the driving shaft are in interference fit, and the outer ring of the transition bearing and the outer shaft sleeve II are in interference fit.
Furthermore, threaded holes are distributed in the outer surface of the first outer shaft sleeve.
Furthermore, the inner wall of the liquid storage tank is in interference fit or threaded connection with the outer shaft sleeve II.
According to the technical scheme, the resistance measuring device for the resistance between the inner ring and the outer ring of the bearing in the rotating state measures the resistance between the inner ring and the outer ring of the bearing in the rotating state in a mode that a static object is connected with a test lead of a test instrument, the problem of winding of a lead is avoided, and the interference influence of the resistance between the inner ring and the outer ring of other bearings which are not measured objects on a measured value can be effectively eliminated by filling gaps between the inner ring and the outer ring of other bearings in the measuring device with conductive liquid.
The invention can measure the resistance value between the inner ring and the outer ring of the bearing in a rotating state, particularly the change rule of the resistance value along with time, and avoids the problem of winding of a test lead, thereby having certain significance for researching the quality of the bearing.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, the device for measuring the resistance between the inner ring and the outer ring of the bearing in the rotating state according to the present embodiment further includes a housing and a driving shaft 4 based on the bearing 1 which needs to measure the resistance between the inner ring and the outer ring, wherein the housing includes an upper portion and a lower portion, the upper portion is a positioning housing 6 with an opening at the bottom, the lower portion is a liquid storage tank 11 with an opening at the top, the positioning housing 6 is placed above the liquid storage tank 11, and the two portions are fixed in relative position;
the driving shaft 4 is coaxially fixed in the positioning shell 6;
the bearing 1 is fixed between the driving shaft 4 and the side wall of the positioning shell 6 through arranging the inner shaft sleeve I2 and the outer shaft sleeve I3;
namely, the inner ring of the bearing 1 is connected with the inner shaft sleeve I2 and fixed on the driving shaft 4, and the outer ring of the bearing 1 is connected with the outer shaft sleeve I3 and fixed on the inner wall of the positioning shell 6;
a gap is reserved between the inner shaft sleeve I2 and the outer shaft sleeve I3 and is not in direct contact with the inner shaft sleeve I;
a transition bearing 8 is arranged at the lower half part of the driving shaft 4, and the transition bearing 8 is coaxially fixed on the driving shaft 4;
meanwhile, the transition bearing 8 is immersed in the conductive liquid 12, namely, the inner ring of the transition bearing 8 is fixed on the driving shaft 4 through the inner shaft sleeve II 9, and the outer ring of the transition bearing 8 is fixed on the inner wall of the liquid storage tank 11 through the outer shaft sleeve II 10;
the top of the positioning shell 6 is provided with a rotating motor 5, and a driving shaft 4 is sleeved on the shaft of the rotating motor 5 and rotates synchronously with the rotating motor 4;
when the rotating motor 5 rotates, the driving shaft 4, the first inner shaft sleeve 2, the second inner shaft sleeve 9, the inner ring of the bearing 1 and the inner ring of the transition bearing 8 are driven to synchronously rotate;
the positioning screw 7 penetrates from the outside of the positioning shell 6 and is connected into the outer shaft sleeve I3;
the first outer shaft sleeve 3, the driving shaft 4, the first inner shaft sleeve 2, the liquid storage tank 11, the positioning screw 7 transition bearing 8, the second inner shaft sleeve 9 and the second outer shaft sleeve 10 are all made of conductive metal, and the positioning shell 6 is made of insulating material;
the testing device further comprises a digital multimeter 14, one end of the digital multimeter 14 is connected with the positioning screw 7 through a testing lead 13, and the other end of the digital multimeter 14 is connected with the outer surface of the liquid storage tank 11.
Also comprises a data acquisition signal line 15 and a data acquisition device 16;
the data acquisition equipment 16 is connected with the digital multimeter 14 through a data acquisition signal line 15.
The following is a detailed description:
the inner shaft sleeve I2, the outer shaft sleeve I3 and the driving shaft 4 are all made of metal with good electric conductivity, and the inner ring of the bearing 1, the inner shaft sleeve I2 and the driving shaft 4 are in interference fit with each other to ensure that the relative positions of the inner shaft sleeve I2, the inner shaft sleeve I2 and the driving shaft 4 are fixed and form a good conductor. And the outer ring of the bearing 1 and the outer shaft sleeve I3 are in interference fit so as to ensure that the relative positions of the outer ring and the outer shaft sleeve I are fixed and form a good conductor. A gap is reserved between the inner shaft sleeve I2 and the outer shaft sleeve I3 and is not in direct contact with the inner shaft sleeve I.
The drive shaft 4 is fitted around the shaft of the rotating electric machine 5 and rotates in synchronism with the rotating electric machine 4.
A plurality of threaded holes are distributed on the outer surface of the outer shaft sleeve I3. The positioning housing 6 is made of an insulating material and is dimensioned such that its inner wall can enclose the outer sleeve 3. The positioning shell 6 is provided with a set of through threaded holes which can ensure that a plurality of positioning screws 7 can be fixed between the first outer shaft sleeve 3 and the positioning shell 6. The positioning screw 7 is made of metal with good conductivity.
The transition bearing 8, the inner shaft sleeve II 9 and the outer shaft sleeve II 10 are all made of metal with good electric conductivity, and the inner ring of the transition bearing 8, the inner shaft sleeve II 9 and the driving shaft 4 are in interference fit so as to ensure that the relative positions of the transition bearing 8, the inner shaft sleeve II 9 and the driving shaft 4 are fixed and form a good conductor. And the outer ring of the transition bearing 8 and the second outer shaft sleeve 10 are in interference fit so as to ensure that the relative positions of the transition bearing and the second outer shaft sleeve are fixed and form a good conductor.
The liquid storage tank 11 is an open container with a bottom surface, is made of metal materials with good electric conductivity, and has the size that the inner wall of the liquid storage tank can wrap the outer shaft sleeve II 10. The inner wall of the liquid storage tank 11 and the outer shaft sleeve 10 can be in direct contact by adopting interference fit, threaded connection and other modes, and a certain gap can also be formed.
The positioning housing 6 is placed over the reservoir 11 with the relative positions fixed.
The liquid storage tank 11 contains conductive liquid 12 with good conductivity. The liquid level of the conductive liquid 12 needs to be over the transition bearing 8, the inner shaft sleeve II 9 and the outer shaft sleeve II 10. But the conductive liquid 12 must not contact the outer sleeve 3 and the outer ring of the bearing 1 in order to avoid a short circuit between the inner ring and the outer ring of the bearing 1.
Two testing lead wires 13 connected with a high-precision digital multimeter 14 are good conducting wires, one testing lead wire is pressed by a positioning screw 7 to form a good conductor with the outer shaft sleeve I3, and the other testing lead wire is connected with the outer surface of the liquid storage tank 11. The high-precision digital multimeter 14 has high precision requirement, and can accurately and dynamically measure the resistance between the inner ring and the outer ring of the bearing 1 and the change rule of the resistance along with time. The high-precision digital multimeter 14 is connected to a data acquisition device 16 via a data acquisition signal line 15.
When the rotating motor 5 rotates, the driving shaft 4, the first inner shaft sleeve 2, the second inner shaft sleeve 9, the inner ring of the bearing 1 and the inner ring of the transition bearing 8 are driven to synchronously rotate. At this time, the outer ring of the bearing 1, the outer ring of the transition bearing 8, the first outer shaft sleeve 3, the second outer shaft sleeve 10, the positioning shell 6, the positioning screw 7, the liquid storage tank 11 and the test lead 13 are all in a static state, so that the problem of winding of a test lead is avoided.
As metal with good wire performance is selected as the material of related parts and the effect of the conductive liquid 12, the conductive liquid 12 is filled between the inner ring and the outer ring of the transition bearing 8, and the inner ring of the bearing 1, the inner shaft sleeve I2, the driving shaft 4, the transition bearing 8, the inner shaft sleeve II 9, the outer shaft sleeve II 10, the liquid storage tank 11 and the conductive liquid 12 form a good conductor together, so that the interference influence of the resistance between the inner ring and the outer ring of the transition bearing 8 on the measurement result can be effectively eliminated. Meanwhile, a good conductor is formed between the outer ring of the bearing 1 and the outer shaft sleeve 3. Because the inner shaft sleeve I2 and the outer shaft sleeve I3 are not in direct contact, the positioning shell 6 is made of an insulating material, and the conductive liquid 11 is not in contact with the outer ring of the bearing 1 and the outer shaft sleeve I3, the resistance between the two good conductors measured by the high-precision digital multimeter 14 can be regarded as the resistance between the inner ring and the outer ring of the bearing 1. The resistance value measured by the high-precision digital multimeter 14 can be acquired, processed and maintained by the data acquisition equipment 16 in real time through the data acquisition signal line 15, so that the resistance between the inner ring and the outer ring of the bearing 1 at a certain time point can be measured, and the change rule of the resistance between the inner ring and the outer ring of the bearing 1 along with time can be measured in a certain time period.
Specifically, the embodiment of the invention has the following outstanding characteristics:
1. the static object is connected with a test lead of a test instrument by combining a group of good-conductivity objects capable of rotating synchronously with the inner ring of the bearing with a group of good-conductivity objects fixed on the outer ring of the bearing, so that the problem of winding of the lead is avoided;
2. when measuring the resistance between the inner ring and the outer ring of the bearing, the conductive liquid is used to fill the gap between the inner ring and the outer ring of the other bearing which is not the object to be measured.
In summary, in the embodiment of the present invention, the resistance between the inner ring and the outer ring of the bearing in the rotating state is measured by connecting the stationary object with the test lead of the test instrument, so as to avoid the problem of winding the lead. By filling the gaps between the inner rings and the outer rings of other bearings in the measuring device with the conductive liquid, the interference influence of the resistance between the inner rings and the outer rings of other bearings which are not the measuring object on the measured value can be effectively eliminated.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a measuring device of resistance between outer lane in bearing under rotation state, based on bearing (1) that need measure resistance between outer lane in the interior, its characterized in that:
the device is characterized by further comprising a shell and a driving shaft (4), wherein the shell comprises an upper part and a lower part, the upper part is a positioning shell (6) with an opening in the bottom, the lower part is a liquid storage tank (11) with an opening in the top, the positioning shell (6) is placed above the liquid storage tank (11), and the relative positions of the positioning shell and the liquid storage tank are fixed;
conductive liquid (12) is arranged in the liquid storage tank (11);
the driving shaft (4) is coaxially fixed in the positioning shell (6);
the bearing (1) is fixed between the driving shaft (4) and the side wall of the positioning shell (6) through arranging the inner shaft sleeve I (2) and the outer shaft sleeve I (3);
namely, the inner ring of the bearing (1) is connected with the inner shaft sleeve I (2) and fixed on the driving shaft (4), and the outer ring of the bearing (1) is connected with the outer shaft sleeve I (3) and fixed on the inner wall of the positioning shell (6);
a gap is reserved between the inner shaft sleeve I (2) and the outer shaft sleeve I (3) and is not in direct contact with the inner shaft sleeve I;
a transition bearing (8) is arranged at the lower half part of the driving shaft (4), and the transition bearing (8) is coaxially fixed on the driving shaft (4);
meanwhile, the transition bearing (8) is immersed in the conductive liquid (12), namely the inner ring of the transition bearing (8) is fixed on the driving shaft (4) through the inner shaft sleeve II (9), and the outer ring of the transition bearing (8) is fixed on the inner wall of the liquid storage tank (11) through the outer shaft sleeve II (10);
a rotating motor (5) is arranged at the top of the positioning shell (6), and a driving shaft (4) is sleeved on a shaft of the rotating motor (5) and rotates synchronously with the rotating motor (4);
when the rotating motor (5) rotates, the driving shaft (4), the inner shaft sleeve I (2), the inner shaft sleeve II (9), the inner ring of the bearing (1) and the inner ring of the transition bearing (8) are driven to synchronously rotate;
the positioning device also comprises a positioning screw (7), and the positioning screw (7) penetrates from the outside of the positioning shell (6) and is connected into the first outer shaft sleeve (3);
the outer shaft sleeve I (3), the driving shaft (4), the inner shaft sleeve I (2), the liquid storage tank (11), the positioning screw (7), the transition bearing (8), the inner shaft sleeve II (9) and the outer shaft sleeve II (10) are all made of conductive metal, and the positioning shell (6) is made of insulating material;
the testing device further comprises a digital multimeter (14), one end of the digital multimeter (14) is connected with the positioning screw (7) through a testing lead (13), and the other end of the digital multimeter (14) is connected with the outer surface of the liquid storage tank (11).
2. The apparatus for measuring electric resistance between an inner race and an outer race of a bearing in a rotating state according to claim 1, wherein: the device also comprises a data acquisition signal line (15) and a data acquisition device (16);
the data acquisition equipment (16) is connected with the digital multimeter (14) through a data acquisition signal line (15).
3. The apparatus for measuring electric resistance between an inner race and an outer race of a bearing in a rotating state according to claim 1, wherein: the inner ring of the bearing (1), the inner shaft sleeve I (2) and the driving shaft (4) are in interference fit;
and the outer ring of the bearing (1) and the first outer shaft sleeve (3) are in interference fit.
4. The apparatus for measuring electric resistance between an inner race and an outer race of a bearing in a rotating state according to claim 1, wherein:
the inner ring of the transition bearing (8), the inner shaft sleeve II (9) and the driving shaft (4) are in interference fit, and the outer ring of the transition bearing (8) and the outer shaft sleeve II (10) are in interference fit.
5. The apparatus for measuring electric resistance between an inner race and an outer race of a bearing in a rotating state according to claim 1, wherein: threaded holes are distributed in the outer surface of the first outer shaft sleeve (3).
6. The apparatus for measuring electric resistance between an inner race and an outer race of a bearing in a rotating state according to claim 1, wherein:
the inner wall of the liquid storage tank (11) is in interference fit or threaded connection with the second outer shaft sleeve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010614629.0A CN111811387B (en) | 2020-06-30 | 2020-06-30 | Device for measuring resistance between inner ring and outer ring of bearing in rotating state |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010614629.0A CN111811387B (en) | 2020-06-30 | 2020-06-30 | Device for measuring resistance between inner ring and outer ring of bearing in rotating state |
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| CN111811387A CN111811387A (en) | 2020-10-23 |
| CN111811387B true CN111811387B (en) | 2021-11-26 |
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| CN202010614629.0A Active CN111811387B (en) | 2020-06-30 | 2020-06-30 | Device for measuring resistance between inner ring and outer ring of bearing in rotating state |
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Cited By (1)
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| TWI823340B (en) * | 2022-04-14 | 2023-11-21 | 威剛科技股份有限公司 | Test device for rotating objects |
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| CN115144682B (en) * | 2022-09-05 | 2022-11-18 | 深圳嘉利祥精工股份有限公司 | Bearing inner race electric conductivity accredited testing organization |
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| CN111811387A (en) | 2020-10-23 |
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