CN219434511U

CN219434511U - High-frequency fatigue testing device for bolt connection pair

Info

Publication number: CN219434511U
Application number: CN202320359431.1U
Authority: CN
Inventors: 王军; 司文见; 王禾佳; 房文静; 周世康; 钱平平; 毛镇澎
Original assignee: Sinosteel Zhengzhou Research Institute of Steel Wire Products Co Ltd
Current assignee: Sinosteel Zhengzhou Research Institute of Steel Wire Products Co Ltd
Priority date: 2023-03-01
Filing date: 2023-03-01
Publication date: 2023-07-28
Anticipated expiration: 2033-03-01

Abstract

The utility model provides a high-frequency fatigue testing device for a bolt connection pair, which belongs to the technical field of high-strength bolt detection and comprises two sleeves, wherein the first sleeve and the second sleeve are arranged at intervals along the up-down direction, one ends of the first sleeve and the second sleeve, which are opposite, are both of an opening structure, one ends of the first sleeve and the second sleeve, which are opposite, are both of a stop block structure, a through hole is formed in the center of the stop block structure for a bolt to pass through, and the stop block structure limits the head part or the nut of the bolt; the utility model improves the existing bolt test fixture, combines the characteristics of the universal fixture and the special fixture, can test large hexagonal high-strength bolts with different specifications, can adapt to bolts with diameters M72 to M12 by replacing the limiting bushing, and can basically reach the level of the special fixture while reducing the manufacturing cost.

Description

High-frequency fatigue testing device for bolt connection pair

Technical Field

The present utility model relates generally to the field of high strength bolt detection technology. More particularly, the utility model relates to a high-frequency fatigue testing device for a bolt connection pair.

Background

The high-strength bolts generally refer to bolts with the grade of more than 8.8, the grade of the high-strength bolts is higher and higher at present in order to further reduce the dependence on steel materials, and compared with the prior art, the high-strength bolts with the grade of 10.9, even 12.9 are applied to steel structures, wind power towers and nuclear power plants to a certain degree. But with higher material strength, the probability of brittle failure and early fatigue failure is increased. So the method is particularly important for the most important fatigue test in the comprehensive index. It is necessary to perform an axial fatigue test on the high strength bolt. Through finding problems and improving, the production of the large hexagon bolts is improved in process, so that the purpose of improving the bolt products is achieved.

The fatigue test of parts generally adopts a fatigue machine, and at present, some manufacturers design fatigue machine equipment special for carrying out fatigue test on high-strength bolts, for example, the utility model patent with the authority of publication number CN103278391B discloses a fatigue performance test device for bolts under the action of a large load in a low-temperature environment.

However, the device and the existing fatigue machine equipment have some problems: the bolt types are more, and various types diameter sizes are different, if each bolt is independently designed to be clamped, the cost can be very high, and certain space can be occupied. Therefore, in view of cost, a general-purpose jig is mostly used, and the structure thereof can be referred to as a test jig in the reference document. The universal fixture is limited on the Y axis, so that the test can be normally performed, and a certain deviation can be caused to the relative detection result, and the deviation basically has no influence in the bolt quality detection. However, if the fatigue detection is performed on the bolts for improving the bolt structure, the error value in the detection process must be reduced to obtain a more accurate value, so as to reduce the influence of errors on the improvement scheme.

The utility model patent with publication number of CN113884293A discloses a bolt tensile test and fatigue test universal fixture capable of being replaced conveniently, and the utility model concept of the scheme is as follows: the main body part (upper sleeve and lower sleeve) of the universal fixture is designed as a universal part, the upper bushing and the lower bushing are respectively and detachably connected to the upper sleeve and the lower sleeve of the universal fixture, and when a bolt piece of a certain model is tested, only the corresponding upper bushing and lower bushing need to be replaced. However, the bushing in this solution is not provided with a rotation stopping structure for the bolt, and during the test, a slight rotation of the bolt may cause instability of the bolt structure, thereby affecting the test result.

Disclosure of Invention

The utility model provides a high-frequency fatigue testing device for a bolt connection pair, which aims to solve the technical problem that the accuracy of a universal test fixture in the prior art cannot meet the requirement of an improved scheme.

In order to solve the problems, the high-frequency fatigue testing device for the bolt connection pair provided by the utility model adopts the following technical scheme: the two sleeves are arranged at intervals along the up-down direction, one ends of the first sleeve and the second sleeve, which are opposite, are of an opening structure, one ends of the first sleeve and the second sleeve, which are opposite, are of a stop block structure, a through hole is formed in the center of the stop block structure for a bolt to pass through, and the stop block structure limits the head part or the nut of the bolt;

the two connecting rods are used for connecting the sleeve and the jaw, so that the two sleeves are respectively fixed on the fatigue machine;

the two limiting bushings are detachably arranged inside the sleeve, the limiting bushings are provided with inner rotation stopping structures for limiting the head of the bolt or the nut, the inner rotation stopping structures are at least provided with one rotation stopping surface, and outer rotation stopping structures are arranged between the sleeve and the limiting bushings so as to prevent the limiting bushings from rotating circumferentially relative to the sleeve.

As a further improvement, the inner rotation stopping structure is provided with six rotation stopping surfaces, and the size of the inner rotation stopping structure corresponds to the size of the head of the bolt or the nut to be detected.

As a further improvement, the corresponding surface of the stop block structure of the sleeve and the bolt head or the nut is provided with a gasket so as to prevent extrusion abrasion caused by direct contact between the bolt head or the nut and the stop block structure.

As a further improvement, a reducing bush is arranged between the stop block structure of the sleeve and the gasket, the reducing bush is sleeved on the bolt, the reducing bush is used for filling a gap between the sleeve and the bolt so as to improve stability between the bolt and the sleeve, and the diameter of a through hole of the reducing bush is matched with the diameter of the bolt so as to prevent the bolt from shaking.

As a further improvement, the reducing bush is integrally formed with a limiting baffle plate so as to prevent the reducing bush from falling off along the through hole of the stop block structure.

As a further improvement, the reducing bush is a nylon reducing bush.

As a further improvement, the outer rotation stopping structure comprises a limiting protrusion arranged on the inner wall of the sleeve, and a limiting groove matched with the limiting protrusion is formed in the outer wall of the limiting bushing, and the limiting protrusion and the limiting groove are axially distributed.

As a further improvement, the limit protrusions are at least provided with one limit groove, and the number of the limit grooves is consistent with that of the limit protrusions.

As a further improvement, the connecting rod is connected with the jaw through threads, and the connecting rod is connected with the sleeve through threads.

As a further improvement, the limit bushing is a steel limit bushing.

The beneficial effects are that: the utility model improves the existing bolt test fixture, combines the characteristics of the universal fixture and the special fixture, can test large hexagonal high-strength bolts with different specifications, can adapt to bolts with diameters M72 to M12 by replacing the limiting bushing, and can basically reach the level of the special fixture while reducing the manufacturing cost.

In the detection test, only the limiting bush corresponding to the bolt, the corresponding reducing bush and the corresponding gasket need to be replaced, the limiting bush can be tightly matched with the bolt, and the connection stability between the limiting bush and the sleeve is good, so that the detection precision is greatly improved; the nylon reducing bush and the rubber gasket are very low in cost, the cost of the limiting bush corresponding to the independent casting is also greatly reduced compared with that of the prior special clamp, and the nylon reducing bush is convenient to assemble, simple to operate and good in practicability.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a schematic diagram of an embodiment of a high-frequency fatigue testing device for a bolting pair according to the present utility model;

FIG. 2 is a front view of the stop bushing of FIG. 1;

FIG. 3 is a top view of the spacing bushing of FIG. 1;

fig. 4 is a sectional view of B-B in fig. 2.

Reference numerals illustrate:

1. a jaw; 2. a connecting rod; 3. a sleeve; 4. a limiting bushing; 5. reducing bush; 6. a bolt; 7. a gasket; 8. and (3) a nut.

Detailed Description

The following description of the embodiments of the present utility model will be made more complete and clear to those skilled in the art by reference to the figures of the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model improves the test fixture again, which solves the problems that the accuracy of the general test fixture in the prior art can not meet the requirement of the improvement scheme and the cost of the special fixture is high.

When the anti-shake device is used, the reducing bush, the gasket and the limiting bush are sequentially arranged in the sleeve, the gasket is prevented from directly contacting the bolt and the connecting sleeve, and the reducing bush fills the gap between the bolt and the connecting sleeve so as to prevent the bolt from shaking. The bolts penetrate through the two sleeves, nuts are mounted on the bolts, the connecting rods are connected with the sleeves, two ends of the bolts are fixed, the other ends of the connecting rods are connected with the jaws, and the bolts are fixed. And then, performing high-frequency fatigue test through a fatigue machine.

And if the high-strength bolts of other types are detected later, the bolts with different specifications can be fixed by replacing the corresponding reducing bush, the corresponding gasket and the corresponding limiting bush.

Having described the basic principles of the present utility model, various non-limiting embodiments of the utility model are described in detail below. Any number of elements in the figures are for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.

The principles and spirit of the present utility model are explained in detail below with reference to several representative embodiments thereof.

The embodiment 1 of the high-frequency fatigue testing device for the bolt connection pair provided by the utility model comprises the following components:

as shown in fig. 1-4, the two sleeves 3 are included, the first sleeve and the second sleeve are arranged at intervals along the up-down direction, one ends of the first sleeve and the second sleeve, which are opposite, are of an opening structure, one ends of the first sleeve and the second sleeve, which are opposite, are of a stop block structure, a through hole is formed in the center of the stop block structure for a bolt 6 to pass through, and the stop block structure limits the head of the bolt or a nut 8;

the two connecting rods 2 are used for connecting the sleeve 3 and the jaw 1, so that the two sleeves 3 are respectively fixed on the fatigue machine;

the sleeve 3 and the connecting rod 2 are all universal parts, and the corresponding limiting bushing 4 needs to be replaced when in use;

two spacing bush 4, it can dismantle the setting inside sleeve 3, and spacing bush 4 has seted up interior structure of stopping for it is spacing to bolt head or nut 8, and interior structure of stopping is equipped with one at least and stops the face of turning, and the setting of stopping the face of turning is in order to prevent that bolt 6 from taking place the circumference rotation, is equipped with outer structure of stopping between sleeve 3 and the spacing bush 4, in order to prevent that spacing bush 4 from taking place the circumference rotation for sleeve 3.

As shown in fig. 3, the internal rotation stopping structure is provided with six rotation stopping surfaces, the size of the internal rotation stopping structure corresponds to the size of the head or the nut 8 of the bolt to be tested, the diameter of each matched limiting bushing 4 is unchanged, the size of the internal rotation stopping structure corresponds to the head or the nut 8 of the bolt, the limiting fixation of bolts 6 with different specifications is realized, and the rotation of the nut in the testing process is prevented, so that the instability of the structure is caused.

As shown in fig. 1, the corresponding surface of the stop structure of the sleeve 3 and the bolt head or the nut 8 is provided with a gasket 7 so as to prevent extrusion abrasion caused by direct contact between the bolt head or the nut 8 and the stop structure and reduce possible data deviation.

As shown in fig. 1, a reducing bush 5 is arranged between the stop structure of the sleeve 3 and the washer 7, the reducing bush 5 is made of nylon, the reducing bush 5 is sleeved on the bolt 6, the reducing bush 5 is used for filling a gap between the sleeve 3 and the bolt 6 so as to improve stability between the bolt 6 and the sleeve 3, and the diameter of a through hole of the reducing bush 5 is matched with the diameter of the bolt 6 so as to prevent the bolt 6 from shaking.

In this embodiment, the reducing bush 5 integrated into one piece has spacing separation blade to prevent that reducing bush 5 from coming off along the through-hole of dog structure, spacing separation blade one can prevent that reducing bush 5 from coming off, also can carry out spacingly to packing ring 7 in addition, and both cooperations protect bolt 6.

As shown in fig. 1 and 3, the external rotation stopping structure comprises a limiting protrusion arranged on the inner wall of the sleeve 3, and a limiting groove matched with the limiting protrusion is formed in the outer wall of the limiting bushing 4, and the limiting protrusion and the limiting groove are axially distributed.

In this embodiment, spacing protruding and spacing recess all are equipped with two, and two spacing protruding symmetry sets up.

In this embodiment, connecting rod 2 passes through threaded connection with jaw 1, and connecting rod 2 passes through threaded connection with sleeve 3, and threaded connection is convenient to dismantle and install.

Example 2 of the high-frequency fatigue test device for the bolt connection pair provided by the utility model:

the differences from example 1 are mainly that:

in embodiment 1, the outer rotation stopping structure comprises a limiting protrusion arranged on the inner wall of the sleeve, a limiting groove matched with the limiting protrusion is formed in the outer wall of the limiting bushing, and the limiting protrusion and the limiting groove are axially distributed.

In this embodiment, the spacing bush is polygon cylinder structure, and the sleeve has offered with spacing bush complex polygon hole, and sleeve and spacing bush just form spacingly like this, can't the circumference rotation.

Embodiment 3 of the high-frequency fatigue testing device for the bolt connection pair provided by the utility model:

the differences from example 1 are mainly that:

in embodiment 1, the inner rotation stopping structure is provided with six rotation stopping surfaces.

In the embodiment, the inner rotation stopping structure is provided with three rotation stopping surfaces, and the three rotation stopping surfaces are arranged at intervals, so that a good limiting effect can be achieved.

Example 4 of the high-frequency fatigue test device for the bolt connection pair provided by the utility model:

the differences from example 1 are mainly that:

in embodiment 1, the connecting rod is screwed with the jaw, and the connecting rod is screwed with the sleeve.

In this embodiment, the connecting rod passes through the spacer pin with keeping silent and is connected, and the connecting rod passes through the spacer pin with the sleeve and is connected, and the spacing hole has all been seted up to keeping silent, connecting rod and sleeve, and the spacer pin passes the spacing hole and carries out spacing fixedly.

Example 5 of the high-frequency fatigue test device for the bolt connection pair provided by the utility model:

the differences from example 1 are mainly that:

in embodiment 1, the sleeve is a steel sleeve, one end of the sleeve is of an opening structure, the other end of the sleeve is provided with a stop block structure, and the sleeve and the stop block structure are integrally formed.

In this embodiment, sleeve both ends are open structure, and the dog structure passes through screw and telescopic connection, and is great to diameter size phase difference like this, the dog structure of adjustable relative adaptation to improve stability.

While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and are therefore to cover all module forms, equivalents, or alternatives falling within the scope of the claims.

Claims

1. The utility model provides a bolted connection pair high frequency fatigue testing arrangement which characterized in that includes:

the two sleeves (3) are arranged at intervals in the vertical direction, one ends of the first sleeve and the second sleeve, which are opposite, are of an opening structure, one ends of the first sleeve and the second sleeve, which are opposite, are of a stop block structure, a through hole is formed in the center of the stop block structure for a bolt (6) to pass through, and the stop block structure limits the head of the bolt or a nut (8);

the two connecting rods (2), the connecting rods (2) are used for connecting the sleeves (3) and the jaws (1), and then the two sleeves (3) are respectively fixed on the fatigue machine;

two spacing bush (4), it can dismantle the setting inside sleeve (3), and spacing bush (4) have been seted up and have been stopped the commentaries on classics structure for it is spacing to bolt head or nut (8), it is equipped with one at least and stops the face to stop to change the structure in, is equipped with outer structure of stopping between sleeve (3) and spacing bush (4), in order to prevent that spacing bush (4) from taking place circumference rotation for sleeve (3).

2. The high-frequency fatigue testing device for the bolt connection pair according to claim 1, wherein: the inner rotation stopping structure is provided with six rotation stopping surfaces, and the size of the inner rotation stopping structure corresponds to the size of the head of the bolt or the nut (8) to be detected.

3. The high-frequency fatigue testing device for the bolt connection pair according to claim 1, wherein: the corresponding surface of the stop block structure of the sleeve (3) and the bolt head or the nut (8) is provided with a gasket (7) so as to prevent extrusion abrasion caused by direct contact between the bolt head or the nut (8) and the stop block structure.

4. The high-frequency fatigue testing device for the bolting pair according to claim 3, wherein: be equipped with reducing bush (5) between dog structure and the packing ring (7) of sleeve (3), reducing bush (5) cover is established on bolt (6), and reducing bush (5) are used for filling the clearance between sleeve (3) and bolt (6) to improve the stability between bolt (6) and sleeve (3), the through-hole diameter of reducing bush (5) coincide with bolt (6) diameter, in order to prevent bolt (6) rocking.

5. The high-frequency fatigue testing device for the bolt connection pair according to claim 4, wherein: the reducing bush (5) is integrally formed with a limiting baffle plate so as to prevent the reducing bush (5) from falling off along the through hole of the stop block structure.

6. The high-frequency fatigue testing device for the bolt connection pair according to claim 5, wherein: the reducing bush (5) is a nylon reducing bush.

7. The high-frequency fatigue testing device for the bolt connection pair according to claim 1, wherein: the outer rotation stopping structure comprises a limiting protrusion arranged on the inner wall of the sleeve (3), and a limiting groove matched with the limiting protrusion is formed in the outer wall of the limiting bushing (4), and the limiting protrusion and the limiting groove are axially distributed.

8. The high-frequency fatigue testing device for the bolting pair according to claim 7, wherein: the limiting protrusions are at least provided with one limiting groove, and the number of the limiting grooves is consistent with that of the limiting protrusions.

9. The bolting pair high frequency fatigue testing device according to any of claims 1 to 8, wherein: the connecting rod (2) is connected with the jaw (1) through threads, and the connecting rod (2) is connected with the sleeve (3) through threads.

10. The bolting pair high frequency fatigue testing device according to claim 9, wherein: the limiting bush (4) is made of steel.