CN114965256B - Device and method for measuring friction coefficient of outer sleeve nut and spherical joint end surface of pipeline connector - Google Patents
Device and method for measuring friction coefficient of outer sleeve nut and spherical joint end surface of pipeline connector Download PDFInfo
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- CN114965256B CN114965256B CN202210686579.6A CN202210686579A CN114965256B CN 114965256 B CN114965256 B CN 114965256B CN 202210686579 A CN202210686579 A CN 202210686579A CN 114965256 B CN114965256 B CN 114965256B
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- spherical joint
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- torque sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a device and a method for measuring friction coefficients of a sleeve nut and a spherical joint end face of a pipeline connecting piece, and belongs to the technical field of pipeline connecting pieces. The device comprises a centering adjustment platform, a double-flange torque sensor, a welding filler neck, a spherical joint, a tension sensor, a jacket nut and an automatic tightening device. According to the invention, the automatic tightening device is arranged outside the coat nut, so that the automatic measurement and control of the input torque are realized, repeated tests are not required to be disassembled again, personal errors are avoided, and the working efficiency is improved; the contact state of the internal thread and the external thread of the coat nut is changed by adopting a centering adjusting platform, so that deviation and an end face included angle are generated between the pitch diameters of the internal thread and the external thread, and the torque-pretightening force mapping relation is changed; the torque and the axial pretightening force of the threaded contact surface of the pipeline connecting piece are obtained in real time through the double-flange torque sensor and the tension sensor, the relation between the input torque and the friction coefficient of the pipeline connecting piece is accurately measured, and the problem that the friction coefficient is difficult to measure is solved.
Description
Technical Field
The invention belongs to the technical field of pipeline connectors, and particularly relates to a device and a method for measuring friction coefficients of a sleeve nut and a spherical joint end face of a pipeline connector.
Background
The pipeline connecting piece is used as an important component of an aviation hydraulic pipeline system, and is widely applied to various pipeline systems of aircrafts and engines due to the compact structure, convenient disassembly and assembly, good sealing performance and easy maintenance. In engineering applications, the coefficient of friction of the pipe connection is an important influencing factor for the sealing performance of the pipe system, and also directly influences the reliability and safety of the whole aircraft system. However, the increase of the friction coefficient can reduce the axial pretightening force generated by the outer sleeve nut, and at the moment, the sealing surface width, the effective sealing area and the effective sealing specific pressure of the pipeline connecting piece can be reduced, so that the sealing performance of the pipeline is reduced, and leakage occurs. Therefore, it is necessary to measure the friction coefficient of the pipe connection to obtain the distribution range of the friction coefficient.
At present, most of researches on tightness of pipeline connectors are focused on measurement of pretightening force, and few friction coefficient measuring devices are used for pipeline connectors. The friction coefficient is obtained after the pipeline connecting piece is processed, the friction coefficient of the surface of the pipeline connecting piece is different due to different processes, the structure of the pipeline connecting piece is complex and compact, the friction coefficient is difficult to be measured by an external measuring sensor, the friction relationship between the structural form and the contact surface of the sensor can be changed, and additional measuring errors are introduced. It is difficult to accurately measure the friction coefficient of the pipe connection.
Disclosure of Invention
The invention provides a device and a method for measuring friction coefficients of a sleeve nut and a spherical joint end face of a pipeline connecting piece, which are used for accurately measuring the friction coefficients of the pipeline connecting piece.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The utility model provides a sleeve nut and ball joint terminal surface coefficient of friction measuring device of pipeline connecting piece, includes base 1, first centering adjustment platform 2, first support frame 3, second centering adjustment platform 15, second support frame 14, two flange formula torque sensor 4, welding filler neck 6, ball joint 11, tension sensor 13, sleeve nut 10 and automatic screwing device.
The first centering adjustment platform 2 and the second centering adjustment platform 15 are mounted on the base 1; the first support frame 3 and the second support frame 14 are respectively fixed on the first centering adjustment platform 2 and the second centering adjustment platform 15, the double flange type torque sensor 4 is arranged on the inner side of the first support frame 3, and the tension sensor 13 is arranged on the inner side of the second support frame 14. The double-flange torque sensor 4 is connected with a first adapter piece 5, and the first adapter piece 5 is welded with a welding filler neck 6 through a guide pipe; the tension sensor 13 is connected with the second adapter 12, and the second adapter 12 is welded with the spherical joint 11 through a conduit. The jacknut 10 is screwed onto the weld neck 6 and the ball joint 11 by a threaded connection.
The automatic tightening device comprises a motor 7, an open spanner 9 and a dynamic torque sensor 8. Wherein, the open spanner 9 is of an open structure, after the shaft end of the open spanner is connected with the rotating shaft of the dynamic torque sensor 8, the open spanner 9 is rotated to enable the opening of the outer layer A and the inner layer B of the open end to be consistent, and the open spanner is arranged on the coat nut 10 along the direction of the guide pipe of the spherical joint 11; the motor 7 is connected to a dynamic torque sensor 8 for inputting a starting torque.
The first centering adjustment platform 2 and the second centering adjustment platform 15 can realize accurate movement in three directions of XYZ, so that the contact state of the internal and external threads of the outer sleeve nut 10 is adjusted and changed, the pitch diameters of the internal and external threads generate deviation and an end face included angle, the size of an equivalent friction radius is changed, the torque-pretightening force mapping relation is changed, and the measurement test of the friction coefficient of the pipeline connecting piece is realized.
The welding filler neck 6 is fixed on the first support frame 3 through the first adapter piece 5 and the double-flange torque sensor 4, the spherical joint 11 is fixed on the second support frame 14 through the second adapter piece 12 and the tension sensor 13, and the separation of the conical surface of the welding filler neck and the contact surface of the spherical joint is realized through the displacement adjustment of the first centering adjustment platform 2 and the second centering adjustment platform 15.
The dynamic torque sensor 8 can measure the input torque T of the jacknut, the double-flange torque sensor 4 can measure the torque T 1 of the threaded contact surface, the tension sensor 13 can measure the axial pretightening force F 0, and the friction torque T 2 of the contact surface of the jacknut 10 and the end surface of the spherical joint 11 is obtained by the following formula:
T＝T1+T2
Further, the friction coefficient mu of the contact surface between the sleeve nut and the end surface of the spherical joint is obtained by the following formula.
Wherein: beta is welding filler neck taper angle of the outer end surface of the taper hole; d is the equivalent diameter of the contact surface of the sleeve nut and the end surface of the spherical joint.
The beneficial effects of the invention are as follows: the measuring device has a simple overall structure and is convenient to detach. According to the invention, the automatic tightening device is arranged outside the coat nut, so that the automatic measurement and control of the input torque can be realized, repeated tests are not required to be disassembled again, personal errors are avoided, and the working efficiency is improved. The centering adjusting platform is adopted to change the contact state of the internal thread and the external thread of the coat nut, so that the pitch diameters of the internal thread and the external thread generate deviation and an end face included angle, the size of the equivalent friction radius is changed, and the torque-pretightening force mapping relation is changed. According to the invention, the detection device composed of the double-flange torque sensor and the tension sensor is used for obtaining the screw thread contact surface torque and the axial pretightening force of the pipeline connecting piece in real time, so that the relation between the input torque and the friction coefficient of the pipeline connecting piece is accurately measured, a technical means is provided for the actual production and assembly of the pipeline connecting piece, and the problem that the friction coefficient is difficult to measure in the prior art is solved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a friction coefficient measuring device for a pipeline connecting piece.
Fig. 2 is an enlarged view of a portion of the piping connection piece a.
Fig. 3 is a moment analysis diagram of a pipe connection.
Fig. 4 is a schematic view of a first adapter.
Fig. 5 is a schematic view of an open ended wrench.
Fig. 6 is a dual flange torque sensor.
FIG. 7 is a schematic view of a centering adjustment platform.
In the figure: 1, a base; 2a first centering adjustment platform; 3, a first supporting frame; 4 double flange torque sensor; 5a first adapter; welding the filler neck; 7, a motor; 8, a dynamic torque sensor; 9, an open-ended wrench; 10, sleeving a nut; 11 ball-type joints; a second adapter; 13a tension sensor; 14a second support frame; 15a second centering adjustment platform; an outer layer A; and B, lining layer.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Referring to fig. 1 to 6, a device for measuring friction coefficient between a cap nut and a spherical joint end face of a pipeline connecting piece comprises a base 1, a first centering adjustment platform 2, a first supporting frame 3, a second centering adjustment platform 15, a second supporting frame 14, a double-flange torque sensor 4, a welding filler neck 6, a spherical joint 11, a tension sensor 13, a cap nut 10 and an automatic tightening device.
The first centering adjustment platform 2 and the second centering adjustment platform 15 are mounted on the base 1; the first support frame 3 and the second support frame 14 are respectively fixed on the first centering adjustment platform 2 and the second centering adjustment platform 15, the double flange type torque sensor 4 is arranged on the inner side of the first support frame 3, and the tension sensor 13 is arranged on the inner side of the second support frame 14. The double-flange torque sensor 4 is connected with a first adapter piece 5, and the first adapter piece 5 is welded with a welding filler neck 6 through a guide pipe; the tension sensor 13 is connected with the second adapter 12, and the second adapter 12 is welded with the spherical joint 11 through a conduit. The jacknut 10 is screwed onto the weld neck 6 and the ball joint 11 by a threaded connection.
The automatic tightening device comprises a motor 7, an open spanner 9 and a dynamic torque sensor 8. Wherein, the open spanner 9 is of an open structure, after the shaft end of the open spanner is connected with the rotating shaft of the dynamic torque sensor 8, the open spanner 9 is rotated to enable the opening of the outer layer A and the inner layer B of the open end to be consistent, and the open spanner is arranged on the coat nut 10 along the direction of the guide pipe of the spherical joint 11; the motor 7 is connected to a dynamic torque sensor 8 for inputting a starting torque.
The first centering adjustment platform 2 and the second centering adjustment platform 15 can realize accurate movement in three directions of XYZ, and further can adjust and change the contact state of the internal and external threads of the jacknut 10, so that the pitch diameters of the internal and external threads are deviated and an end face included angle is generated, the equivalent friction radius is changed, the torque-pretightening force mapping relation is changed, and the measurement test of the friction coefficient of the pipeline connecting piece is realized.
The welding filler neck 6 is fixed in through first adaptor 5 with two flange formula torque sensor 4 first support frame 3, spherical joint is fixed in through second adaptor 12 with tension sensor 13 second support frame 14, through the displacement adjustment of first centering adjustment platform 2 and second centering adjustment platform 15, realize that the welding filler neck conical surface separates with spherical joint contact surface.
The method for measuring the friction coefficient of the end face of the sleeve nut and the spherical joint of the pipeline connecting piece by adopting the device comprises the following steps:
Step 1: determining the specification of a pipeline connecting piece, reading the taper angle of the outer end surface of a taper hole of a welding filler neck 6, and measuring the equivalent diameter of the end surface contact surface of a sleeve nut 10 and a spherical joint 11;
step 2: the first adapter piece 5 is welded with the welding filler neck 6 in a conduit way, and the second adapter piece 12 is welded with the spherical joint 11 in a conduit way;
Step 3: the first adapter piece 5 and the second adapter piece 12 are respectively connected and fixed with the double-flange torque sensor 4 and the tension sensor 13 through bolts;
Step 4: the double-flange torque sensor 4 and the tension sensor 13 are respectively installed and fixed on the first supporting frame 3 and the second supporting frame 14;
Step 5: the first centering adjustment platform 2 and the second centering adjustment platform 15 are respectively installed and fixed with corresponding bolts of the first support frame 3 and the second support frame 14, displacement adjustment handles of the first centering adjustment platform 2 and the second centering adjustment platform 15 are rotated to separate the conical surface of the welding neck from the contact surface of the spherical joint 11, and a knob is locked;
step 6: the automatic tightening device is assembled and sleeved into the outer sleeve nut 10 through a spherical joint 11;
step 7: the double-flange torque sensor 4, the dynamic torque sensor 8 and the tension sensor 13 are connected with a data acquisition device and are connected with a power supply;
Step 8: the test device was opened and the test was started.
Step 9: and reading the readings of the double-flange torque sensor 4, the dynamic torque sensor 8 and the tension sensor 13, and calculating the friction coefficient mu of the contact surface of the end face of the external sleeve nut 10 and the spherical joint 11, thereby obtaining the relation between the input torque and the friction coefficient of the pipeline connecting piece.
The above examples merely illustrate embodiments of the present invention to facilitate the understanding of the present patent by those skilled in the art, but the present patent is not limited to the specific implementation scope, and it is within the scope of the present invention to make several changes to those skilled in the art without departing from the inventive concept.
Claims (3)
1. The device for measuring the friction coefficient of the end surfaces of the jacketing nut and the spherical joint of the pipeline connecting piece is characterized by comprising a base (1), a first centering adjustment platform (2), a first supporting frame (3), a second centering adjustment platform (15), a second supporting frame (14), a double-flange torque sensor (4), a welding filler neck (6), a spherical joint (11), a tension sensor (13), a jacketing nut (10) and an automatic screwing device;
The first centering adjustment platform (2) and the second centering adjustment platform (15) are arranged on the base (1); the first support frame (3) and the second support frame (14) are respectively fixed on the first centering adjustment platform (2) and the second centering adjustment platform (15), a double-flange torque sensor (4) is arranged on the inner side of the first support frame (3), and a tension sensor (13) is arranged on the inner side of the second support frame (14); the double-flange torque sensor (4) is connected with the first adapter (5), and the first adapter (5) is welded with the welding filler neck (6) through a guide pipe; the tension sensor (13) is connected with the second adapter piece (12), and the second adapter piece (12) is welded with the guide pipe of the spherical joint (11); the outer sleeve nut (10) is screwed into the welding filler neck (6) and the spherical joint (11) through threaded connection;
The automatic tightening device comprises a motor (7), a dynamic torque sensor (8) and an open spanner (9); the open spanner (9) is of an open structure, and after the shaft end of the open spanner is connected with the rotating shaft of the dynamic torque sensor (8), the open spanner (9) is rotated to enable the outer layer and the inner layer of the open end to be consistent, and the open spanner is arranged on the coat nut (10) along the direction of the guide pipe of the spherical joint (11); the motor (7) is connected to a dynamic torque sensor (8) for inputting a starting torque.
2. The device for measuring the friction coefficient of the end face of the external sleeve nut and the spherical joint of the pipeline connecting piece according to claim 1, wherein the first centering adjusting platform (2) and the second centering adjusting platform (15) can realize accurate movement in three directions of XYZ, so that the contact state of the internal thread of the external sleeve nut (10) is adjusted and changed, the internal thread pitch diameter generates deviation and an end face included angle, the size of an equivalent friction radius is changed, the torque-pretightening force mapping relation is changed, and the measurement test of the friction coefficient of the pipeline connecting piece is realized.
3. A method of measuring a coefficient of friction measuring device according to claim 1 or 2, characterized in that the method comprises the steps of:
step 1: determining the specification of a pipeline connecting piece, reading the taper angle of the outer end surface of a taper hole of a welding filler neck (6), and measuring the equivalent diameter of the contact surface of an outer sleeve nut (10) and the end surface of a spherical joint (11);
Step 2: welding the first adapter (5) with the welding filler neck (6) through a guide pipe, and welding the second adapter (12) with the spherical joint (11) through a guide pipe;
step 3: the first adapter piece (5) and the second adapter piece (12) are respectively connected and fixed with the double-flange torque sensor (4) and the tension sensor (13) through bolts;
step 4: the double-flange torque sensor (4) and the tension sensor (13) are respectively arranged and fixed on the first supporting frame (3) and the second supporting frame (14);
Step 5: the first centering adjustment platform (2) and the second centering adjustment platform (15) are respectively fixedly installed with the first support frame (3) and the second support frame (14), displacement adjustment handles of the first centering adjustment platform (2) and the second centering adjustment platform (15) are rotated to realize separation of the conical surface of the welding filler neck and the contact surface of the spherical joint, and the knob is locked;
step 6: the automatic tightening device is assembled and installed and sleeved on the coat nut (10);
Step 7: the double-flange torque sensor (4), the dynamic torque sensor (8) and the tension sensor (13) are connected with a data acquisition device and are connected with a power supply;
step 8: opening the test device to start a test;
Step 9: reading the readings of a double-flange type torque sensor (4), a dynamic torque sensor (8) and a tension sensor (13), wherein the dynamic torque sensor (8) measures the input torque T of the jacknut, the double-flange type torque sensor (4) measures the torque T 1 of a threaded contact surface, the tension sensor (13) measures the axial pretightening force F 0, and the friction torque T 2 of the end surface contact surface of the jacknut (10) and the spherical joint (11) is obtained by subtracting the torque T 1 of the threaded contact surface from the input torque T of the jacknut; and calculating to obtain the friction coefficient mu of the end face contact surface of the sleeve nut and the spherical joint through the mapping relation between the axial pretightening force F 0 and the friction torque T 2 of the end face contact surface of the sleeve nut (10) and the spherical joint (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210686579.6A CN114965256B (en) | 2022-06-17 | 2022-06-17 | Device and method for measuring friction coefficient of outer sleeve nut and spherical joint end surface of pipeline connector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210686579.6A CN114965256B (en) | 2022-06-17 | 2022-06-17 | Device and method for measuring friction coefficient of outer sleeve nut and spherical joint end surface of pipeline connector |
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| Publication Number | Publication Date |
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| CN114965256A CN114965256A (en) | 2022-08-30 |
| CN114965256B true CN114965256B (en) | 2024-11-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106248572A (en) * | 2016-08-04 | 2016-12-21 | 安徽江淮汽车股份有限公司 | A kind of bolt friction coefficient measuring apparatus |
| CN106439332A (en) * | 2016-12-21 | 2017-02-22 | 中国南方航空工业(集团)有限公司 | Rotating pipe joint |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2347723B (en) * | 1996-01-31 | 2000-11-22 | Luk Getriebe Systeme Gmbh | Actuator for use in a motor vehicle power train |
| JP4087667B2 (en) * | 2002-09-05 | 2008-05-21 | 中央精機株式会社 | Method for detecting the tightening force of bolts and nuts |
| JP5096551B2 (en) * | 2010-12-20 | 2012-12-12 | Ｔｈｋ株式会社 | Screw motion mechanism and damping device using the same |
| DE102017119676A1 (en) * | 2017-08-28 | 2019-02-28 | Frank Hohmann | Method for documented tightening or retightening of a screw connection |
| CN111458123A (en) * | 2020-04-12 | 2020-07-28 | 北京工业大学 | A measuring device for friction coefficient and torque coefficient of threaded fasteners |
| CN111721697A (en) * | 2020-06-24 | 2020-09-29 | 北京工业大学 | A universal measuring device for key friction coefficients of bolts suitable for torque method and rotation angle method |
| CN111855181B (en) * | 2020-07-27 | 2021-09-14 | 西南交通大学 | Testing arrangement of pipe joint tightening torque and angle displacement relation |
| CN114215979A (en) * | 2021-11-29 | 2022-03-22 | 中国航发沈阳发动机研究所 | A pipeline connection pressing device |
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- 2022-06-17 CN CN202210686579.6A patent/CN114965256B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248572A (en) * | 2016-08-04 | 2016-12-21 | 安徽江淮汽车股份有限公司 | A kind of bolt friction coefficient measuring apparatus |
| CN106439332A (en) * | 2016-12-21 | 2017-02-22 | 中国南方航空工业(集团)有限公司 | Rotating pipe joint |
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