CN108375444B - Self-locking nut locking torque measuring method - Google Patents
Self-locking nut locking torque measuring method Download PDFInfo
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- CN108375444B CN108375444B CN201611056440.4A CN201611056440A CN108375444B CN 108375444 B CN108375444 B CN 108375444B CN 201611056440 A CN201611056440 A CN 201611056440A CN 108375444 B CN108375444 B CN 108375444B
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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
Abstract
A self-locking nut locking torque measuring method uses a special torque measuring tool to measure the self-locking nut locking torque; the torque measurement tool comprises the following components: a group of process bolts (1), a group of bushes (2) with different lengths, a group of limiting bases (3) and a force limiting wrench; wherein: the process bolt (1) corresponds to various self-locking nut thread specifications; the bushing (2) is matched with different self-locking nuts and has selectable length; the process bolt (1) is fixed on the limiting base (3), the self-locking nut is screwed to the process bolt (1), and the locking torque of the self-locking nut is measured by using a force-limiting wrench. The invention is suitable for the field of use and maintenance of aero-engines and is used for detecting the locking and tightening torque of the self-locking nut of the engine. The device is simple and easy to install, convenient to detect, wide in application range, cost-saving, simple in structure and convenient to operate, and has expectable relatively great economic value and social value.
Description
Technical Field
The invention relates to the technical field of structural design and application of a torque detection tool for an aeroengine using and maintaining technology, and particularly provides a self-locking nut locking torque measurement method.
Background
The self-locking nut of the aero-engine mainly adopts a type with a neck closing-in, preset deformation is generated through the closing-in, friction force is generated between the nut and threads on the bolt after the nut is screwed down, the purposes of locking and loosening are achieved, the structure is favorable for reducing the weight of the engine and improving the thrust-weight ratio, and the self-locking nut is a high-efficiency locking form commonly adopted by modern aero-engines. The self-locking nut is mainly applied to fixing key parts such as rotor discs, shaft parts, combined surfaces of all main unit bodies and the like. Along with the increase of the working time of the engine, the preset deformation of the nut is gradually reduced under the action of vibration and heat exchange variable load, particularly the deformation of the self-locking nut of the hot-end part is difficult to recover, once the self-locking nut is not effectively detected in the periodic maintenance process, the loosening fault occurs after the self-locking nut is installed, and very serious consequences can be caused to the flight safety of the airplane.
In the maintenance process of the aircraft engine, the locking torque of the self-locking nut of more than two thousand pieces needs to be detected, and the complex process and the huge workload are realized. The main method for detecting the self-locking nut is locking torque detection, and two methods are adopted for detection at present, wherein firstly, assembly detection is carried out on a real object part in the assembly process, and secondly, a process bolt is fixed by a vice for detection. Assembly detection is carried out on a real object, repeated assembly and disassembly can damage threads of the real object parts, and meanwhile, the locking torque of the self-locking nut is checked to seriously influence the assembly period of the engine; the mode of fixing the bolts by using a vice can only fix 3-4 process bolts at a time, and the detection efficiency is low. People hope to obtain a self-locking nut locking torque measuring method with excellent technical effect.
Disclosure of Invention
The invention aims to provide a self-locking nut locking torque measuring method with excellent technical effect. Aiming at the problem of detecting the moment of a great number of nuts of an aircraft engine, the invention provides the detection device which is portable, quick, accurate, wide in application range, simple and convenient to operate, free of damage to engine parts and capable of shortening the repair period of the engine.
The invention provides a method for measuring a locking torque of a self-locking nut, which is characterized by comprising the following steps of: the self-locking nut locking torque measurement is carried out by using a special torque measurement tool; the special torque measurement tool comprises the following components: the bolt comprises a group of process bolts 1, a group of bushes 2 with different lengths, a group of limiting bases 3 and at least one limiting wrench; wherein: the technical bolt 1 corresponds to various specifications of self-locking nut threads, and the thread specification of the same self-locking nut corresponds to a technical bolt; the bush 2 is matched with different self-locking nuts and has at least two different lengths which can be selected; setting a plurality of process bolt heads according to the locking torque range; the same process bolt head is correspondingly provided with a limiting base;
in the implementation process of the self-locking nut locking torque measuring method, the process bolt 1 is fixed on the limiting base 3, the self-locking nut is screwed on the process bolt 1, and the locking torque of the self-locking nut is measured by using the force limiting wrench.
The method for measuring the locking torque of the self-locking nut is characterized in that: before the self-locking nut locking torque measuring method is implemented, the following work needs to be done:
measuring and counting the specification, thickness and outer diameter of the threads of the respective lock nuts in advance;
according to the detection requirement, each self-locking nut is screwed to the matched process bolt 1 by using a force-limiting wrench, the part extends out twice of the thread pitch, namely the part with 2 threads (including a chamfer), and then the length of the self-locking nut extending out of the process bolt 1 is counted; and the actual length of the bolt stud is measured.
The design of the process bolt 1 is carried out before the self-locking nut locking torque is measured, and the design of the process bolt 1 meets the following requirements:
designing the length of the process bolt 1 according to the actual length statistical data of the stud of the process bolt 1 with the same thread specification; determining the material of the process bolt 1 according to the actual self-locking nut material, wherein the material of the process bolt 1 is required to be consistent with the actual self-locking nut material;
the shape of the head of the process bolt 1 is designed according to the moment for screwing the self-locking nut, and the shape of the head of the process bolt is one of the following two types or the combination of the following two types: cross-shaped and square. The design that moment is big is the cross, and the design that moment is little is square.
Before the self-locking nut locking torque is measured, the design, the manufacture and the stock preparation of the bushing 2 are carried out, and the design of the bushing 2 meets the following requirements:
need design simulation material object's bush 2 to the nut of same kind of screw specification, requires to correspond to set up a bush:
the inner diameter of the bush 2 is designed according to the thread size; the outer diameter of the bush 2 is designed according to the maximum size in the outer diameters of the self-locking nuts; the length of the bush 2 is designed into different groups according to the length of the process bolt 1 extending out of the self-locking nut and the length of the process bolt 1.
Before the self-locking nut locking torque is measured, the design, manufacture and stock preparation of the limiting base 3 are carried out, and the design of the limiting base 3 meets the following requirements:
the limiting base 3 is a base for fixing the process bolt 1; a hole which is consistent with the shape and the size of the head of the process bolt 1 is arranged on the base; when in force limitation, the process bolt 1 can be fixed by directly placing the process bolt into a corresponding hole according to the shape and the size of the bolt head; for convenient use, the holes at the head of the process bolt 1 in the same shape are designed on a limiting base 3, and a plurality of holes corresponding to the head of the same process bolt 1 are designed and distributed on the base, so that the process bolts 1 can be used simultaneously;
the four corners of the limiting base 3 are provided with bolt through holes, and the limiting base can be fixed at a certain position of the workbench by bolts so as to be convenient to use.
And checking a tool comparison table for the nut needing to detect the locking torque, and selecting a process bolt and a bushing with corresponding thread specifications. And (3) finding the holes with the same shape and size on the limiting base according to the shape and size of the bolt head, placing the holes, and sleeving the bushings on the screw piles of the process bolt. The maximum and minimum locking torque can be detected by screwing the nut.
The following work is firstly carried out before the locking torque of the self-locking nut is measured:
designing a tooling comparison table: counting the self-locking nut part number, the tooling number of the process bolt 1, the tooling number of the bushing 2 and the tooling number of the limiting base 3 to be in one-to-one correspondence; so as to be convenient for inquiring and using during operation.
The self-locking nut locking torque measurement also meets the following requirements:
checking a tool comparison table for a nut needing to detect the locking torque, and selecting a process bolt 1 and a bush 2 with corresponding thread specifications; finding holes with the same shape and size on the limiting base 2 according to the shape and size of the head of the bolt 1, putting the holes into the holes, and sleeving the screw pile of the process bolt 1 with the bushing 2; the maximum and minimum locking torque can be detected by screwing the nut.
The invention is suitable for the field of use and maintenance of aero-engines and is used for detecting the locking and tightening torque of the self-locking nut of the engine. The moment detection tool is combined with a group of process bolts 1, a group of bushings 2 and a group of limiting bases 3, and can detect tightening moments of various nuts. The structure is simple, the operation is convenient, and the inspection period of a large number of nuts in the process of repairing the aviation engine is long.
The invention has simple installation: the limiting base 3 of the detection device is square with the length and the width of 200mm, through holes are formed in four corners of the limiting base, the occupied area is small, the limiting base can be used for punching and mounting on various plane workbenches, and due to the fact that the holes in the limiting base 3 are through holes, bolts with different thicknesses can be selected according to the strength born by the limiting base 3 to be fixed.
The invention has convenient detection: through this moment detection device, simple structure convenient operation can be fast, accurately carry out locking torque to self-locking nut and detect, saves time and laborsaving to a large amount of nuts detect the problem of cycle length in the aeroengine repair process has been solved.
The invention has wide application range: the invention can detect various nut locking torques. Meanwhile, the process bolt 1 can also be used for checking the screwing performance after the nut thread is repaired; for the special threaded nut, the corresponding process bolt 1 and the corresponding bush 2 can be manufactured and matched with the limiting base 3 for use; for other parts needing circumferential fixing for inspection, the parts can be manufactured and fixed by using the limiting base 3.
The invention saves the cost: the invention can be directly used without torque detection on a real object, thereby protecting engine parts, reducing the abrasion of the parts and shortening the repair period of the engine.
The torque detection tool assembly is simple in structure and convenient to operate, can be used for quickly and accurately detecting the tightening torque of the self-locking nut, is time-saving and labor-saving, and accordingly solves the problem that the inspection period of a large number of nuts is long in the repair process of an aircraft engine.
Different sizes can be respectively distributed for the process bolt and the limiting base in the combined tool, so that the flexibility is higher, and the application range is wide.
The invention can be directly used without torque detection on a real object casing, thereby protecting engine parts, reducing the abrasion of the parts, shortening the repair period of the engine and obviously saving the repair cost of the engine. The method has expectable huge economic value and social value.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic sketch front view of a cross-head process bolt 1;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is a schematic front view of the bushing 2;
FIG. 4 is one of schematic diagrams of the structure of the stopper base 3;
fig. 5 is a second schematic diagram of the structure of the stopper base 3.
Detailed Description
In fig. 3, the length L of the bush 2 is 11.5mm or 16 mm.
Example 1
A self-locking nut locking torque measuring method uses a special torque measuring tool to measure the self-locking nut locking torque; the special torque measurement tool comprises the following components: the bolt comprises a group of process bolts 1, a group of bushes 2 with different lengths, a group of limiting bases 3 and at least one limiting wrench; wherein: the technical bolt 1 corresponds to various specifications of self-locking nut threads, and the thread specification of the same self-locking nut corresponds to a technical bolt; the bush 2 is matched with different self-locking nuts and has at least two different lengths which can be selected; setting a plurality of process bolt heads according to the locking torque range; the same process bolt head is correspondingly provided with a limiting base;
in the implementation process of the self-locking nut locking torque measuring method, the process bolt 1 is fixed on the limiting base 3, the self-locking nut is screwed on the process bolt 1, and the locking torque of the self-locking nut is measured by using the force limiting wrench.
Before the self-locking nut locking torque measuring method is implemented, the following work needs to be done:
measuring and counting the specification, thickness and outer diameter of the threads of the respective lock nuts in advance;
according to the detection requirement, each self-locking nut is screwed to a bolt matched with the self-locking nut by using a force limiting wrench, the self-locking nut extends out twice of the thread pitch, namely 2 threads comprise chamfers, and then the length of the bolt extending out of the self-locking nut is counted; and the actual length of the bolt stud is measured.
The design of the process bolt 1 is carried out before the self-locking nut locking torque is measured, and the design of the process bolt 1 meets the following requirements:
designing the length of the process bolt 1 according to the actual length statistical data of the stud of the process bolt 1 with the same thread specification; determining the material of the process bolt 1 according to the actual self-locking nut material, wherein the material of the process bolt 1 is required to be consistent with the actual self-locking nut material;
the shape of the head of the process bolt 1 is designed according to the moment for screwing the self-locking nut, and the shape of the head of the process bolt is one of the following two types or the combination of the following two types: cross-shaped and square. The design that moment is big is the cross, and the design that moment is little is square.
Before the self-locking nut locking torque is measured, the design, the manufacture and the stock preparation of the bushing 2 are carried out, and the design of the bushing 2 meets the following requirements:
need design simulation material object's bush 2 to the nut of same kind of screw specification, requires to correspond to set up a bush:
the inner diameter of the bush 2 is designed according to the thread size; the outer diameter of the bush 2 is designed according to the maximum size in the outer diameters of the self-locking nuts; the length of the bush 2 is designed into different groups according to the length of the process bolt 1 extending out of the self-locking nut and the length of the process bolt 1.
Before the self-locking nut locking torque is measured, the design, manufacture and stock preparation of the limiting base 3 are carried out, and the design of the limiting base 3 meets the following requirements:
the limiting base 3 is a base for fixing the process bolt 1; a hole which is consistent with the shape and the size of the head of the process bolt 1 is arranged on the base; when in force limitation, the process bolt 1 can be fixed by directly placing the process bolt into a corresponding hole according to the shape and the size of the bolt head; for convenient use, the holes at the head of the process bolt 1 in the same shape are designed on a limiting base 3, and a plurality of holes corresponding to the head of the same process bolt 1 are designed and distributed on the base, so that the process bolts 1 can be used simultaneously;
the four corners of the limiting base 3 are provided with bolt through holes, and the limiting base can be fixed at a certain position of the workbench by bolts so as to be convenient to use.
And checking a tool comparison table for the nut needing to detect the locking torque, and selecting a process bolt and a bushing with corresponding thread specifications. And (3) finding the holes with the same shape and size on the limiting base according to the shape and size of the bolt head, placing the holes, and sleeving the bushings on the screw piles of the process bolt. The maximum and minimum locking torque can be detected by screwing the nut.
The following work is firstly carried out before the locking torque of the self-locking nut is measured: designing a tooling comparison table: counting the self-locking nut part number, the tooling number of the process bolt 1, the tooling number of the bushing 2 and the tooling number of the limiting base 3 to be in one-to-one correspondence; so as to be convenient for inquiring and using during operation.
The self-locking nut locking torque measurement also meets the following requirements:
checking a tool comparison table for a nut needing to detect the locking torque, and selecting a process bolt 1 and a bush 2 with corresponding thread specifications; finding holes with the same shape and size on the limiting base 2 according to the shape and size of the head of the bolt 1, putting the holes into the holes, and sleeving the screw pile of the process bolt 1 with the bushing 2; the maximum and minimum locking torque can be detected by screwing the nut.
The embodiment is suitable for the field of use and maintenance of aero-engines and used for detecting the locking and tightening torque of the self-locking nut of the engine. The moment detection tool is combined with a group of process bolts 1, a group of bushings 2 and a group of limiting bases 3, and can detect tightening moments of various nuts. The structure is simple, the operation is convenient, and the inspection period of a large number of nuts in the process of repairing the aviation engine is long.
The installation of this embodiment is simple and easy: the limiting base 3 of the detection device is square with the length and the width of 200mm, through holes are formed in four corners of the limiting base, the occupied area is small, the limiting base can be used for punching and mounting on various plane workbenches, and due to the fact that the holes in the limiting base 3 are through holes, bolts with different thicknesses can be selected according to the strength born by the limiting base 3 to be fixed.
The embodiment has the advantages that the detection is convenient: through this moment detection device, simple structure convenient operation can be fast, accurately carry out locking torque to self-locking nut and detect, saves time and laborsaving to a large amount of nuts detect the problem of cycle length in the aeroengine repair process has been solved.
The embodiment has wide application range: this embodiment can detect to all kinds of nut locking torque. Meanwhile, the process bolt 1 can also be used for checking the screwing performance after the nut thread is repaired; for the special threaded nut, the corresponding process bolt 1 and the corresponding bush 2 can be manufactured and matched with the limiting base 3 for use; for other parts needing circumferential fixing for inspection, the parts can be manufactured and fixed by using the limiting base 3.
This embodiment saves cost: the embodiment can be directly used, torque detection is not required to be carried out on a real object, engine parts are protected, abrasion of the parts is reduced, and the repair period of the engine is shortened.
The torque detection tool combination has the advantages of simple structure, convenience in operation, capability of quickly and accurately screwing the self-locking nut for torque detection, time and labor saving, and the problem of long check period of a large number of nuts in the repair process of an aircraft engine is solved.
Different sizes can be respectively distributed for the process bolt and the limiting base in the combined tool, so that the flexibility is higher, and the application range is wide.
The embodiment can be directly used without carrying out torque detection on the material object casing, thereby protecting engine parts, reducing the abrasion of the parts, shortening the repair period of the engine and obviously saving the repair cost of the engine; the method has expectable huge economic value and social value.
Example 2
1. Preparation work:
the test work was performed at room temperature. Before the detection work, after the installation torque is tightened and after the detection work is finished, the temperature of the nut cannot exceed 45 ℃ by measuring the chamfer angle of the nut body.
And (3) dipping 4050 lubricating oil by a brush to be smeared on the screw thread of the nut and the corresponding process bolt 1 for lubrication.
Checking a tooling comparison table, selecting a process bolt 1 with a corresponding thread specification, putting the process bolt 1 into a corresponding limiting base 3 according to the shape of the head of the process bolt 1, selecting a bushing 2 with a corresponding length according to the comparison table, and sleeving the bushing 2 on the process bolt 1 to be detected.
2. And (3) detecting the locking torque:
and screwing the self-locking nut to the position of the bolt extending twice the thread pitch, namely 2-thread threads (including chamfers) by using a force-limiting spanner.
And (3) continuously screwing the nut by using a force limiting wrench for specifying the maximum locking torque range of the nut to be detected until the nut is contacted with the end face of the bush 2, and measuring the maximum locking torque in the process.
And screwing the nut to the mounting torque by using a force limiting wrench for specifying the mounting torque range of the nut to be detected.
The nut is then unscrewed half a turn, the axial load is removed, and rotation is stopped.
And then, continuously screwing out the nut by using a force-limiting wrench with the minimum locking torque range specified by the nut to be detected until the nut is separated from the bolt (the distance from the tail part of the bolt to two times of the thread pitch (including chamfer)) to measure the minimum locking torque value.
3. Disassembling the nut: and (4) detaching the self-locking nut, taking down the lining 2 and taking out the process bolt 1.
Claims (5)
1. A self-locking nut locking torque measuring method is characterized in that: the method is a special detection method for the self-locking nut of the aero-engine;
the self-locking nut locking torque measurement is carried out by using a special torque measurement tool; the special torque measurement tool comprises the following components: the bolt comprises a group of process bolts (1), a group of bushes (2) with different lengths, a group of limiting bases (3) and at least one limiting wrench; wherein: the technical bolt (1) corresponds to various specifications of self-locking nut threads, and the thread specification of the same self-locking nut corresponds to one technical bolt; the bushing (2) is matched with different self-locking nuts, and at least two different lengths can be selected; setting a plurality of process bolt heads according to the locking torque range; the same process bolt head is correspondingly provided with a limiting base;
before the self-locking nut locking torque measuring method is implemented, the following work needs to be done:
measuring and counting the specification, thickness and outer diameter of the threads of the respective lock nuts in advance;
according to the detection requirement, each self-locking nut is screwed to the process bolt (1) matched with the self-locking nut by using a force-limiting wrench, the process bolt extends out twice of the thread pitch, namely the thread position is 2 times, and then the length of the process bolt (1) extending out of the self-locking nut is counted; measuring the actual length of the bolt stud;
in the implementation process of the self-locking nut locking torque measuring method, the process bolt (1) is fixed on the limiting base (3), the self-locking nut is screwed on the process bolt (1), and the locking torque of the self-locking nut is measured by using the force limiting wrench.
2. The method for measuring the locking torque of the self-locking nut according to claim 1, wherein: the design of the process bolt (1) is carried out before the self-locking nut locking torque is measured, and the design of the process bolt (1) meets the following requirements:
designing the length of the process bolt (1) according to the actual length statistical data of the stud of the process bolt (1) with the same thread specification; determining the material of the process bolt (1) according to the actual self-locking nut material, wherein the material of the process bolt (1) is required to be consistent with the actual self-locking nut material;
the shape of the head of the process bolt (1) is designed according to the moment for screwing the self-locking nut, and the shape of the head of the process bolt is one of the following two types or the combination of the following two types: cross-shaped and square.
3. The method for measuring the locking torque of the self-locking nut according to claim 1, wherein: the design, manufacture and stock preparation of the bushing (2) are carried out before the measurement of the locking torque of the self-locking nut, and the design of the bushing (2) meets the following requirements:
need design bush (2) in kind of simulation object to the nut of same kind of screw specification, require to correspond to set up a bush:
the inner diameter of the bushing (2) is designed according to the thread size; the outer diameter of the bushing (2) is designed according to the largest dimension of the outer diameters of the self-locking nuts; the length of the bushing (2) is designed into different groups according to the length of the process bolt (1) extending out of the self-locking nut and the length of the process bolt (1).
4. The method for measuring the locking torque of the self-locking nut according to claim 1, wherein: before the self-locking nut locking torque is measured, the design, the manufacture and the stock preparation of the limiting base (3) are carried out, and the design of the limiting base (3) meets the following requirements:
the limiting base (3) is a base for fixing the process bolt (1); the base is provided with a hole which is consistent with the shape and the size of the head of the process bolt (1); during force limiting, the process bolt (1) can be fixed by directly placing the process bolt into a corresponding hole according to the shape and size of the bolt head; in order to facilitate use, holes corresponding to the heads of the process bolts (1) in the same shape are designed on one limiting base (3), and a plurality of holes corresponding to the heads of the same process bolts (1) are designed and distributed on the base, so that the process bolts (1) can be used simultaneously;
the four corners of the limiting base (3) are provided with bolt through holes, and the limiting base can be fixed at a certain position of the workbench by bolts so as to be convenient to use;
checking a tool comparison table for a nut needing to detect the locking torque, and selecting a process bolt and a bush of corresponding thread specifications; finding and placing holes with the same shape and size on the limiting base according to the shape and size of the head of the bolt, and sleeving the bushings on the screw piles of the process bolt; screwing the nut can detect the maximum and minimum locking torque.
5. The method for measuring the locking torque of the self-locking nut according to claim 1, wherein: the following work is firstly carried out before the locking torque of the self-locking nut is measured:
designing a tooling comparison table: counting the self-locking nut part number, the tool number of the process bolt (1), the tool number of the bushing (2) and the tool number of the limiting base (3) in a list to be in one-to-one correspondence; so as to be convenient for inquiring and using during operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611056440.4A CN108375444B (en) | 2016-11-25 | 2016-11-25 | Self-locking nut locking torque measuring method |
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| CN201611056440.4A CN108375444B (en) | 2016-11-25 | 2016-11-25 | Self-locking nut locking torque measuring method |
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| CN108375444A CN108375444A (en) | 2018-08-07 |
| CN108375444B true CN108375444B (en) | 2021-06-01 |
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| CN110333025B (en) * | 2019-07-16 | 2021-04-16 | 中国航发沈阳发动机研究所 | Design method of tool for detecting effectiveness of locking torque of self-locking nut and thread plug gauge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE515534C2 (en) * | 1999-04-28 | 2001-08-20 | Atlas Copco Tools Ab | Torque application system for tightening fasteners and a set of nut sleeves |
| CN102672671A (en) * | 2012-04-27 | 2012-09-19 | 河南省西峡汽车水泵股份有限公司 | Device and method for achieving large torque effects by using small torque spanner |
| CN102967404B (en) * | 2012-08-10 | 2015-05-20 | 贵州航天精工制造有限公司 | Test method for obtaining stable locking torque of self-locking nut |
| CN203853445U (en) * | 2014-05-26 | 2014-10-01 | 贵州航太精密制造有限公司 | Correcting device for locking torque of self-locking nut |
| CN105479391B (en) * | 2014-10-13 | 2017-08-29 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of hole inner nut limiter tightens adapter |
| CN105222944B (en) * | 2015-09-18 | 2018-01-02 | 河南航天精工制造有限公司 | The test method and high-temperature test device of locking torque test |
| CN105291025A (en) * | 2015-11-04 | 2016-02-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Nut force limiting device and using method thereof |
| CN105485127A (en) * | 2015-12-29 | 2016-04-13 | 武汉正通传动技术有限公司 | Nut for locking operation |
| CN205655953U (en) * | 2016-04-13 | 2016-10-19 | 上海沃施园艺股份有限公司 | Omnipotent utensil of examining of bolt screw maximum torque |
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