CN115077764A - Bolt pretightening force testing device and bolt installation method - Google Patents
Bolt pretightening force testing device and bolt installation method Download PDFInfo
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- CN115077764A CN115077764A CN202210805269.1A CN202210805269A CN115077764A CN 115077764 A CN115077764 A CN 115077764A CN 202210805269 A CN202210805269 A CN 202210805269A CN 115077764 A CN115077764 A CN 115077764A
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- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009434 installation Methods 0.000 title claims description 23
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000036316 preload Effects 0.000 claims description 9
- 238000000418 atomic force spectrum Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 description 4
- 230000005483 Hooke's law Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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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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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application discloses a bolt pretightening force testing device and a bolt mounting method. This bolt pretightning force testing arrangement includes: the holding assembly is used for holding the sample assembly, and the sample assembly comprises an auxiliary workpiece and a bolt sample for connecting the auxiliary workpiece and the holding assembly together; the torsion assembly applies torque to the bolt sample to generate pretightening force between the auxiliary workpiece and the holding assembly; and the pressure sensor is arranged between the auxiliary workpiece and the holding component to detect the pretightening force. In the bolt pretightening force testing device, the pressure sensor is used for directly measuring pretightening force applied by the bolt sample at each twisted stage, so that the measured pretightening force of the bolt sample is more accurate.
Description
Technical Field
The application relates to the field of bolt mechanical property testing, in particular to a bolt pretightening force testing device. The application also relates to a bolt mounting method.
Background
A bolt is a common fastener commonly used to join two workpieces together. After the bolt is installed, the screw of the bolt is stretched to apply a pre-load force to the two workpieces toward each other, so that the two workpieces are stably connected together.
Under some conditions, the bolts used need to bear large acting force, which requires the installation method of the bolts to be designed in advance so as to enable the bolts to reach the preset pretightening force. In the prior art, the pretension of the bolt is usually tested using an ultrasonic method. Specifically, the length change of the bolt before and after the bolt is installed is measured by using ultrasonic waves, and the pretightening force of the bolt is calculated by utilizing the Hooke's law. However, hooke's law only applies to measuring pretension with the screw in the elastic range. In fact, when the bolt is designed, the screw may be designed to screw into the plastic deformation zone, in which case hooke's law does not apply, which makes the measured pretension of the bolt inaccurate.
Disclosure of Invention
To the technical problem, the first aspect of the present application provides a bolt pretightening force testing device. This bolt pretightning force testing arrangement includes: the holding assembly is used for holding the sample assembly, and the sample assembly comprises an auxiliary workpiece and a bolt sample for connecting the auxiliary workpiece and the holding assembly together; the torsion assembly applies torque to the bolt sample so as to generate pretightening force between the auxiliary workpiece and the holding assembly; and the pressure sensor is arranged between the auxiliary workpiece and the holding assembly to detect the pretightening force.
In one embodiment, the bolt pretightening force testing device further comprises an angle sensor, and the angle sensor detects the rotation angle of the torque assembly when the torque assembly applies torque to the bolt sample.
In one embodiment, the torque assembly is a servo gun, and the angle sensor is integrated into the servo gun.
In one embodiment, the pressure sensor has an axial through-hole through which the shank of the bolt sample extends.
In one embodiment, the holding assembly comprises a first stationary stage for carrying the sample assembly and the pressure sensor; the bolt sample is fixed on the first fixing table.
In one embodiment, the bolt pretension testing device further comprises a machine frame and a clamp connected with the machine frame through a movement-positioning mechanism, and the torsion assembly is clamped by the clamp.
In one embodiment, the bolt pretightening force testing device further comprises a second fixing table fixedly arranged corresponding to the first fixing table, and the torsion assembly is fixedly arranged on the second fixing table.
In one embodiment, a holding station for the sample assembly is configured at the first holding station; a fastening position of the torsion assembly is formed on the second fastening table, so that the torsion assembly is aligned with the bolt specimen.
In one embodiment, there is a gap between the first and second fixed stages.
A second aspect of the present application provides a bolt mounting method, including the steps of: the method comprises the following steps: obtaining an angle-torque curve and an angle-pretension force curve of a bolt sample by using the bolt pretension force testing device; obtaining the yield torque and the maximum torque of the bolt sample through an angle-torque curve; the yield torque corresponds to the yield angle and the maximum torque corresponds to the limit angle; the yield angle is less than the limit angle. Step two: determining the pre-installation torque of a bolt to be installed, and obtaining a first rotation angle corresponding to the pre-installation torque through an angle-torque curve; the pre-installation torque is less than the yield torque. Step three: summing the first rotation angle and a preset second rotation angle to obtain a third rotation angle; obtaining a third torque corresponding to the third rotation angle through the angle-torque curve and obtaining a pre-tightening force corresponding to the third rotation angle through the angle-pre-tightening force curve; when the pretightening force is in a preset pretightening force range, the third rotation angle is between the yield angle and the limit angle, and the third torque is smaller than the maximum torque, the preinstallation torque and the second rotation angle are judged to be suitable for installing the bolt to be installed; when the pretension force is outside the predetermined pretension force range and/or the third rotation angle is outside the yield angle and the limit angle and/or the third torque is greater than or equal to the maximum torque, the value of the pre-installation torque and/or the second rotation angle is adjusted such that the pretension force falls within the pretension force range, the third rotation angle is between the yield angle and the limit angle and the third torque is less than the maximum torque.
Compared with the prior art, the beneficial effects of this application are as follows: in the testing device according to the application, the pressure sensor is arranged between the auxiliary workpiece and the holding assembly, so that the bolt sample is applied with torque until the bolt sample is twisted and broken, and the pressure sensor can directly and uninterruptedly measure the pretightening force applied by the bolt sample between the auxiliary workpiece and the holding assembly. From this, the pretightning force that the testing arrangement of this application surveyed is more accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 schematically shows a bolt pretension testing device according to an embodiment of the present application.
Figure 2 schematically illustrates a first embodiment of the retention assembly in cooperation with the twist assembly.
Figure 3 schematically illustrates a second embodiment of the retention assembly in cooperation with the twist assembly.
Fig. 4 schematically shows an angle-torque curve of a bolt sample measured by the bolt pretension testing device according to the present application.
Fig. 5 schematically shows an angle-pretension force curve of a bolt sample measured by the bolt pretension testing device according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 schematically shows a bolt pretension testing device 1 (hereinafter simply referred to as testing device 1) according to an embodiment of the present application. As shown in fig. 1, the test apparatus 1 includes a holding assembly 10, a torsion assembly 20, and a pressure sensor 30. The holding assembly 10 is used to hold the sample assembly 40. Specifically, the sample assembly 40 includes an auxiliary workpiece 401 and a bolt sample 402 that connects the auxiliary workpiece 401 and the holding assembly 10 together. The torsion assembly 20 is used to apply torque to the bolt sample 402 to create a preload force between the auxiliary workpiece 401 and the retaining assembly 10. The pressure sensor 30 is provided between the auxiliary workpiece 401 and the holding member 10 to detect the preload.
According to the testing device 1 of the present application, when the preload of the bolt sample 402 is tested, the torsion assembly 20 is used to continuously apply torque to the bolt sample 402, and the bolt sample 402 is twisted until being twisted off. During the entire process, the pressure sensor 30 directly and uninterruptedly detects the pretension exerted by the bolt test piece 402 between the auxiliary workpiece 401 and the holding assembly 10. In short, the pressure sensor 30 directly measures the pre-load applied by the bolt specimen 402 at each stage of its twisting. Compared with the ultrasonic method in the prior art, the testing device 1 obviously has more accurate measured pretightening force.
Optionally, the testing device 1 further comprises an angle sensor 70. The angle sensor 70 is used to detect the rotation angle of the torque assembly 20 when the torque assembly 20 applies a torque to the bolt sample 402. The angle sensor 70 is conventional in the art and will not be described in detail herein.
Alternatively, the torque assembly 20 is a servo gun, and the angle sensor 70 is integrated into the servo gun. Thus, using the servo gun can not only conveniently apply torque to the bolt sample 402 but also conveniently acquire the torque and the rotation angle during the whole screwing process of the bolt sample 402. In addition, torque and rotation angle can be set for the servo gun to accurately control the screwing of the bolt. Servo guns and servo guns with angle sensors are conventional in the art and will not be described in detail herein.
It should be understood that the angle sensor 70 and the servo gun may also be provided separately, rather than integrating the angle sensor 70 into the servo gun.
Alternatively, the torque assembly 20 may also be a torque wrench capable of displaying torque and rotational angle. Torque wrenches are also conventional in the art and will not be described in detail herein.
As shown in fig. 2, the pressure sensor 30 has an axial through hole. The threaded shaft 404 of the bolt sample 402 extends through the through hole. In this way, the bolt sample 402 integrally connects the pressure sensor 30 and the auxiliary workpiece 401, and prevents the pressure sensor 30 from deviating from the auxiliary workpiece 401 during the test process, which may cause inaccurate data.
Optionally, the holding assembly 10 comprises a first stationary stage 101 for carrying the sample assembly 40 and the pressure sensor 30. The bolt sample 402 is fixed to the first fixing table 101.
Alternatively, in the embodiment shown in fig. 2, the first stationary stage 101 is a vise. The vise holds the nut 403 of the bolt sample 402. The pressure sensor 30 is provided on the vise. An auxiliary workpiece 401 is disposed on the pressure sensor 30, and a bolt hole is configured on the auxiliary workpiece 401. The bolt hole is aligned with the through hole of the pressure sensor 30 and the nut 403. Thus, the screw 404 of the bolt sample 402 can be passed through the auxiliary member 401 and the pressure sensor 30 and then engaged with the nut 403. Thus, the pressure sensor 30, the auxiliary workpiece 401, and the bolt sample 402 are integrally and stably provided on the bench clamp.
Alternatively, in other embodiments not shown, the first fixing table 101 may be a plate body, and bolt holes are configured on the plate body, and nuts are fixed to the plate body (for example, the first fixing table 101 is a metal plate, and the nuts are welded to the metal plate). In this way, the pressure sensor 30, the auxiliary workpiece 401, and the bolt specimen 402 can also be integrally and stably provided to the plate body.
As also shown in fig. 1 and 2, the testing apparatus 1 further includes a fixed frame 60 and a clamp 601 connected to the frame 60 by a movement-positioning mechanism 602, the torsion assembly 20 being held by the clamp 601. According to this structure, the torsion assembly 20 is stably held by the jig 601, and there is no need to manually operate and hold the torsion assembly 20 when screwing the bolt sample 402, which greatly simplifies the test work. In addition, the kinematic-positioning mechanism 602 may hold the clamp 601 in a desired position. Thus, during testing, the jig 601 can be displaced by the kinematic-positioning mechanism 602 to align and hold the torsion assembly 20 with the bolt specimen 402. After the test is completed, the clamp 601 may be displaced by the kinematic-positioning mechanism 602 to bias the torsion assembly 20 away from the specimen assembly 40 to facilitate the removal of the specimen assembly 40. In one embodiment, the motion-positioning mechanism 602 may be a positioning hinge, a hydraulically actuated arm, or the like, which will not be described in detail herein.
As also shown in fig. 1 and 2, the first fixing stage 101 is horizontally disposed so that the bolt sample 402 is in a vertical state. Accordingly, the torsion assembly 20 is aligned with the bolt specimen 402 from above, which can be accomplished by moving the torsion assembly 20 by the motion-positioning mechanism 602. This is particularly advantageous for bolt samples having a large length dimension.
Optionally, in the embodiment shown in fig. 3, the testing device 1 further comprises a second fixing stage 603 fixedly arranged corresponding to the first fixing stage 101. The torsion assembly 20 is fixedly disposed on the second fixing stage 603. In this structure, the movement-positioning mechanism 602 is not required, which simplifies the testing apparatus 1.
The first holding table 101 is configured with a holding position for the sample assembly 40. A fastening position of the torsion assembly 20 is formed on the second fastening table 603, so that the torsion assembly 20 remains aligned with the bolt specimen 402. In this way, since the positions of the first and second fixing stages 101 and 603 are fixed to each other, as long as the specimen assembly 40 and the torsion assembly 20 are mounted on the first and second fixing stages 101 and 603, respectively, the torsion assembly 20 is naturally aligned with the bolt specimen 402, which greatly simplifies the mounting process of the specimen assembly 40 and the torsion assembly 20.
As also shown in fig. 3, a gap 604 exists between the first stationary stage 101 and the second stationary stage 603. In this way, sample assembly 40 and torsion assembly 20 may be easily disassembled through gap 604.
Optionally, as shown in fig. 3, the first fixing table 101 and the second fixing member 603 are both vertically arranged plate bodies, so as to reduce the space occupied by the testing apparatus 1, and have a simple structure and a low manufacturing cost. In this case, since the first fixing table 101 and the second fixing member 603 are both vertically disposed, the bolt sample 402 is in a horizontal state, and accordingly, the torsion assembly 20 is also in a horizontal state.
Optionally, the testing device 1 further comprises a data processing component 50. The data processing assembly 50 communicates with the torsion assembly 20, the pressure sensor 30, and the angle sensor to obtain the value of the torque applied to the bolt sample 402, the value of the angle of rotation of the torque assembly 20 (e.g., a servo gun), and the value of the pretension, thereby generating an angle-torque curve (as shown in fig. 4) and an angle-pretension curve (as shown in fig. 5) of the bolt sample 402.
The application also provides a bolt mounting method. The method comprises the following steps:
the method comprises the following steps: an angle-torque curve (as shown in fig. 4) and an angle-pretension curve (as shown in fig. 5) of a bolt specimen were obtained using the test apparatus 1 according to the above. In the angle-torque curve, the abscissa is the angle and the ordinate is the torque. In the angle-pretension curve, the abscissa is the angle and the ordinate is the pretension.
The yield torque T2 and the maximum torque T0 of the bolt specimens were obtained by angle-torque curves. Yield torque T2 corresponds to yield angle β 2, maximum torque T0 corresponds to limit angle β 0; the yield angle β 2 is smaller than the limit angle β 0.
Step two: and determining the pre-installation torque T1 of the bolt to be installed, and obtaining a first rotation angle beta 1 corresponding to the pre-installation torque T1 through an angle-torque curve. The pre-installation torque T1 is less than the yield torque T2.
The preinstallation torque T1 may be determined by one skilled in the art based on the actual circumstances.
Step three: and summing the first rotation angle beta 1 and a preset second rotation angle to obtain a third rotation angle beta 3. A third torque T3 corresponding to the third rotation angle β 3 is obtained from the angle-torque curve and a preload F corresponding to the third rotation angle β 3 is obtained from the angle-preload curve. The second angle of rotation is determined and adjustable by a person skilled in the art according to the actual circumstances.
When the pretightening force F is in the preset pretightening force range, the third rotating angle beta 3 is between the yield angle beta 2 and the limit angle beta 0, and the third torque T3 is smaller than the maximum torque T0, the preinstallation torque T1 and the second rotating angle are judged to be suitable for installing the bolt to be installed; when the pretension force F is outside the predetermined pretension force range and/or the third torque T3 is greater than and/or the third angle of rotation β 3 is outside the yield angle β 2 and the limit angle β 0 and/or is equal to the maximum torque T0; the values of the pre-installation torque and/or the second rotation angle are adjusted, so that the pre-tightening force falls within the pre-tightening force range, the third rotation angle beta 3 is between the yield angle beta 2 and the limit angle beta 0, and the third torque T3 is smaller than the maximum torque T0.
For example, the preset pretension force of the bolt to be installed ranges from 60kN to 80 kN.
For example, as shown in fig. 4, from the angle-torque curve, the yield torque T2 for the bolt sample is about 220Nm, corresponding to a yield angle β 2 of about 450 degrees; the maximum torque T0 is about 250Nm, corresponding to a limit angle β 0 of about 550 degrees.
50% of the yield torque T2 (i.e., about 110Nm) was taken as the pre-installation torque T1 of the bolt to be installed. As can be seen from the angle-torque curve, the first rotation angle β 1 of the pre-installation torque T1 is about 300 degrees. The predetermined second rotation angle is 180 degrees, and thus the third rotation angle β 3 is about 480 degrees. As can be seen from the angle-torque curve, the third torque T3 corresponding to the third rotation angle β 3 is about 232 Nm; according to the angle-pretension force curve, the pretension force F corresponding to the third rotation angle β 3 is about 65 kN. It can be seen that the preload force F is within the range of the required preload force, the third rotation angle β 3 is between the yield angle β 2 and the limit angle β 0, and the third torque T3 is smaller than the maximum torque T0, and. It is therefore suitable to mount the bolt with a pre-mounting torque T1 of about 110Nm, a second turning angle of 180 degrees.
The installation process of the installation bolt is as follows: the target torque of the servo gun is set to the pre-installation torque T1, and the bolts are preliminarily installed. After the servo gun reaches the pre-installation torque T1, the rotation angle of the servo gun is set to the second rotation angle. And after the servo gun reaches the second rotation angle, the bolt is installed.
List of reference numerals:
bolt pretightning force testing arrangement: 1
A holding assembly: 10
A first fixed table: 101
A torsion assembly: 20
A pressure sensor: 30
A sample assembly: 40
Auxiliary workpiece: 401
Bolt sample: 402
Nut: 403
Screw rod: 404
A data processing component: 50
A frame: 60
A clamp: 601
Motion-positioning mechanism: 602
A second fixed table: 603
Clearance: 604
An angle sensor: 70
Maximum torque: t0
Pre-installation torque: t1
Yield torque: t2
Third torque: t3
Pre-tightening force: f
The limiting angle is as follows: beta 0
First rotation angle: beta 1
Yield angle: beta 2
The third rotation angle: beta 3
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. The utility model provides a bolt pretightning force testing arrangement which characterized in that includes:
a holding assembly for holding a sample assembly comprising an auxiliary workpiece and a bolt sample connecting the auxiliary workpiece and the holding assembly together;
a torsion assembly that applies a torque to the bolt specimen to generate a preload force between the auxiliary workpiece and the holding assembly; and
a pressure sensor disposed between the auxiliary workpiece and the holding assembly to detect the pretension.
2. The bolt pretension testing device of claim 1, further comprising an angle sensor that detects a rotation angle of the torque assembly when the torque assembly applies a torque to the bolt sample.
3. The bolt pretension testing device of claim 2, wherein the torque assembly is a servo gun, and the angle sensor is integrated into the servo gun.
4. The bolt pretension testing device of claim 1, wherein the pressure sensor has an axial through hole through which the screw of the bolt sample extends.
5. The bolt pretension testing device of claim 4, wherein the holding assembly comprises a first fixed table for carrying the sample assembly and the pressure sensor; the bolt sample is fixed on the first fixing table.
6. The bolt pretension testing device of claim 5, further comprising a frame and a clamp connected to the frame by a kinematic-positioning mechanism, the torsion assembly being clamped by the clamp.
7. The bolt pretension testing device of claim 5, further comprising a second fixing table fixedly arranged corresponding to the first fixing table, wherein the torsion assembly is fixedly arranged on the second fixing table.
8. The bolt pretension testing device of claim 7, wherein a fixing position of the sample assembly is configured on the first fixing table; a fastening position of the torsion assembly is configured on the second fastening stage such that the torsion assembly remains aligned with the bolt specimen.
9. The bolt pretension testing device of claim 8, wherein a gap exists between the first and second fixed tables.
10. A bolt installation method, comprising the steps of:
the method comprises the following steps: obtaining an angle-torque curve and an angle-pretension curve of a bolt sample using the bolt pretension testing device according to any one of claims 1 to 9; obtaining the yield torque and the maximum torque of the bolt sample through the angle-torque curve; the yield torque corresponds to a yield angle and the maximum torque corresponds to a limit angle; the yield angle is less than the limit angle;
step two: determining the pre-installation torque of the bolt to be installed, and obtaining a first rotation angle corresponding to the pre-installation torque through the angle-torque curve; the pre-installation torque is less than the yield torque;
step three: summing the first rotation angle and a preset second rotation angle to obtain a third rotation angle; obtaining a third torque corresponding to the third rotation angle through the angle-torque curve and obtaining a pre-tightening force corresponding to the third rotation angle through the angle-pre-tightening force curve; when the pre-tightening force is in a preset pre-tightening force range, the third rotation angle is between the yield angle and the limit angle, and the third torque is smaller than the maximum torque, the pre-installation torque and the second rotation angle are judged to be suitable for installing the bolt to be installed; when the pre-tightening force is out of the predetermined pre-tightening force range and/or the third rotation angle is out of the yield angle and the limit angle and/or the third torque is greater than or equal to the maximum torque, adjusting the value of the pre-installation torque and/or the second rotation angle so that the pre-tightening force falls within the pre-tightening force range, the third rotation angle is between the yield angle and the limit angle and the third torque is less than the maximum torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805269.1A CN115077764A (en) | 2022-07-08 | 2022-07-08 | Bolt pretightening force testing device and bolt installation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805269.1A CN115077764A (en) | 2022-07-08 | 2022-07-08 | Bolt pretightening force testing device and bolt installation method |
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| CN115077764A true CN115077764A (en) | 2022-09-20 |
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| CN202210805269.1A Pending CN115077764A (en) | 2022-07-08 | 2022-07-08 | Bolt pretightening force testing device and bolt installation method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203772475U (en) * | 2014-04-04 | 2014-08-13 | 中联重科股份有限公司 | Measuring device for pretightening force of connector |
| CN109029962A (en) * | 2018-08-30 | 2018-12-18 | 周子翘 | Determine the pilot system of fastening arrangement and method for construction |
| WO2020020297A1 (en) * | 2018-07-25 | 2020-01-30 | 北京理工大学 | Measurement device used for torque coefficient sampling and method for establishing torque coefficient model |
| CN111060248A (en) * | 2019-12-26 | 2020-04-24 | 珠海中航艾维检测技术有限公司 | Nut pretightning force and moment of torsion test equipment |
| CN111390547A (en) * | 2020-05-18 | 2020-07-10 | 南通大学 | Bolt pretightening force loading method |
-
2022
- 2022-07-08 CN CN202210805269.1A patent/CN115077764A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203772475U (en) * | 2014-04-04 | 2014-08-13 | 中联重科股份有限公司 | Measuring device for pretightening force of connector |
| WO2020020297A1 (en) * | 2018-07-25 | 2020-01-30 | 北京理工大学 | Measurement device used for torque coefficient sampling and method for establishing torque coefficient model |
| CN109029962A (en) * | 2018-08-30 | 2018-12-18 | 周子翘 | Determine the pilot system of fastening arrangement and method for construction |
| CN111060248A (en) * | 2019-12-26 | 2020-04-24 | 珠海中航艾维检测技术有限公司 | Nut pretightning force and moment of torsion test equipment |
| CN111390547A (en) * | 2020-05-18 | 2020-07-10 | 南通大学 | Bolt pretightening force loading method |
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