CN220772157U

CN220772157U - Detection device for measuring elongation of bolt

Info

Publication number: CN220772157U
Application number: CN202321881641.3U
Authority: CN
Inventors: 肖芝; 刘智湘; 凌旭; 孟少明
Original assignee: Hunan Vocational College of Chemical Technology
Current assignee: Hunan Vocational College of Chemical Technology
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2024-04-12
Anticipated expiration: 2033-07-12

Abstract

The utility model relates to a detection device for measuring elongation of a bolt, wherein the bolt comprises a bolt head part and a bolt rod part which are fixedly connected, the detection device comprises a nut, the nut is in threaded connection with the bolt rod part, and the bolt rod part extends along the length direction of the bolt rod part under the rotation action of the nut so as to form the elongation; the pre-tightening assembly is sleeved outside the bolt rod part and is positioned between the bolt head and the nut in a pre-tightening state; the detection component is fixedly connected with the bolt rod part, the detection component and the pre-tightening component are respectively arranged on two sides of the nut, and synchronously move along the length direction of the bolt rod part with the bolt rod part under the rotating action of the nut and are used for measuring the elongation of the bolt. The utility model has simple structure and low cost, can be suitable for measuring the elongation of a large number of bolts, eliminates accumulated errors caused by detecting the elongation of the whole bolt length by detecting the elongation of the bolt part length, and improves the detection precision of the bolt elongation.

Description

Detection device for measuring elongation of bolt

Technical Field

The utility model relates to the technical field of measurement, in particular to a detection device for measuring bolt elongation.

Background

In order to ensure stability and reliability of a connecting structure, the bolt has higher pretightening force requirement, the design of the elongation required by the bolt must meet the pretightening force requirement of the connecting structure in the process of tightening the bolt, in order to meet the elongation required by the bolt, the bolt is generally prepared by adopting stainless steel materials with higher ductility, the existing screw tightening mode is mainly divided into a torque method, a torque and rotation angle method and an elongation method, and the torque method is most widely applied, and has the defects of easy interference by external factors, low control precision and incapability of fully playing the connecting performance of the materials; the torque and rotation angle method is commonly used in a process flow with higher assembly precision requirement, and aims to ensure the consistency of the tightening shaft force of the bolt, and ensure that the shaft force of the bolt is between a material elastic area and a yield area after the bolt is tightened, namely, the state of the bolt is close to the yield area after the bolt is tightened, the torque and the angle are required to be monitored in the working process, the price of an assembly tool is higher, and meanwhile, the processing precision and the material performance of the thread are higher, and the elongation method also comprises a hydraulic elongation method and a measurement elongation method; the hydraulic stretching method is to stretch the whole bolt in a hydraulic way so as to reach the length of the yield point of the material, and lightly screwing the nut to fix the bolt so as to control the threaded connection strength.

Disclosure of Invention

(1) Technical problem to be solved

The utility model provides a detection device for measuring the elongation of a bolt, which is characterized in that a detection component is fixed on a bolt rod part, and the in-situ rotation of a nut drives the bolt rod part to extend along the length direction of the bolt rod part in a direction far away from the head of the bolt by utilizing the pressing force between the nut and a pre-tightening component so as to generate the elongation, so that the detection component which moves synchronously with the bolt rod part can accurately measure the actual elongation of the bolt, only the elongation of the bolt part is detected, the accumulated error caused by detecting the elongation of the whole bolt length is eliminated, and the detection precision of the elongation of the bolt is improved.

(2) Technical proposal

In a first aspect, an embodiment of the present utility model provides a detection device for measuring elongation of a bolt, where the bolt includes a bolt head and a bolt stem that are fixedly connected, the bolt stem is provided with threads, the detection device includes a nut, and the nut is screwed to the bolt stem, and the bolt stem extends along a length direction of the bolt stem under a rotation action of the nut to form the elongation; the pre-tightening assembly is sleeved outside the bolt rod part and is positioned between the bolt head part and the nut in a pre-tightening state; the detection assembly is fixedly connected with the bolt rod part, the detection assembly and the pre-tightening assembly are respectively arranged on two sides of the nut, and synchronously move along the length direction of the bolt rod part under the rotation action of the nut and are used for measuring the elongation.

Further, the detection assembly comprises a fixed block in threaded connection with the bolt rod portion and a locking pin penetrating through the fixed block and used for fixedly mounting the fixed block on the bolt rod portion, and the fixed block is provided with a displacement sensor used for detecting the moving distance of the fixed block along the length direction of the bolt rod portion.

Further, still including the cover locate the outside fixed subassembly of bolt shank portion, fixed subassembly is located the nut with detect between the subassembly, detect the subassembly at least partially extend to in the fixed subassembly, fixed subassembly with the nut is connected and under the nut rotatory effect with the nut synchronous rotation.

Further, the fixed subassembly is including the cover locate the outside fixed cover of bolt shank portion, the detection subassembly include with bolt shank portion threaded connection's fixed block, fixed cover with be equipped with the cavity between the bolt shank portion, at least part on the fixed block extends to in the cavity, just the fixed block is located the part of cavity is equipped with and is used for measuring the detection mark of elongation.

Further, the detection assembly further comprises a locking pin penetrating through the fixed block for fixedly mounting the fixed block (1) on the bolt rod portion.

Further, the fixed block is provided with a displacement sensor for detecting a moving distance of the fixed block in a length direction of the bolt shank.

Further, the fixing assembly further comprises a magnetic attraction block sleeved outside the bolt rod part, the magnetic attraction block is fixedly connected with the fixing sleeve and located between the fixing sleeve and the nut, and the magnetic attraction block is in adsorption connection with the nut.

Further, the fixing sleeve comprises two semi-cylindrical mounting blocks, positioning pins for positioning the two mounting blocks and fastening screws for fixedly connecting the two mounting blocks.

Further, each mounting block is provided with a positioning pin hole for mounting the positioning pin and a threaded hole for mounting the fastening screw.

Further, the pre-tightening assembly comprises a first sleeve and a second sleeve which are both sleeved on the bolt rod part, the first sleeve is in a pre-tightening state and is arranged between the bolt head part and the second sleeve, and the second sleeve is in a pre-tightening state and is arranged between the first sleeve and the nut.

(3) Advantageous effects

In conclusion, through fixing the detection component on the bolt pole portion and utilizing the compressive force between nut and the pretension subassembly, the normal position rotation that makes the nut drives the bolt pole portion and extends in order to produce the extension along its length direction to the direction of keeping away from the bolt head, make the detection component that moves in step with the bolt pole portion can be accurate measure the actual extension of bolt, and not only simple structure, easy dismounting, and need not to adopt special measuring tool and reduce cost, can also be applicable to the measurement of big bolt extension in batches, improve batch measuring's detection efficiency, can also realize detecting the extension to bolt part length, eliminate and detect the extension on the whole bolt length and bring accumulated error, improve the detection precision to the bolt extension.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of the structure of the testing device of the present utility model.

Fig. 2 is a structural cross-sectional view of the test device of the present utility model.

FIG. 3 is a cross-sectional view of another configuration of the testing device of the present utility model.

In the figure:

1-a fixed block;

2-bolts; 21-bolt head; 22-bolt shank;

3-a first sleeve; 4-a second sleeve; 5-nuts; 6-magnetic attraction blocks; 7-fixing the sleeve; 8-locating pins; 80-locating pin holes; 9-fastening a screw; 90-threaded hole.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the utility model and are not intended to limit the scope of the utility model, i.e., the utility model is not limited to the embodiments described, but covers any modifications, substitutions and improvements in parts, components and connections without departing from the spirit of the utility model.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, the present utility model relates to a detection device for measuring elongation of a bolt, the bolt 2 includes a bolt head 21 and a bolt stem 22 which are fixedly connected, the bolt stem 22 is provided with threads, the detection device includes a nut 5, the nut 5 is in threaded connection with the bolt stem 22, the bolt stem 22 extends along the length direction of the bolt stem 22 under the rotation action of the nut 5 to form the elongation to be measured, the elongation is based on the rotation of the nut 5 on the bolt stem 22, the pre-tightening component is in a pre-tightening state between the bolt head 21 and the nut 5, so that the nut 5 is not moved along the length direction of the bolt stem 22 in the screwing process of the bolt stem 22, thereby limiting the movement of the nut 5 along the length direction of the bolt stem 22 and only rotating along the radial direction of the bolt stem 22, specifically, the radial acting force is generated on the bolt stem 22 at the position where the nut 5 contacts with the pre-tightening component to generate the pre-tightening force, the bolt stem 22 deforms in the radial direction, the bolt stem 22 is the radial direction, the elongation to be measured is the elongation to be measured, and the elongation is the length of the bolt head is not increased along the radial direction due to the pre-tightening force of the bolt head, the elongation to the length to be measured, the length is the length of the bolt head is not increased, and the elongation is the length increased; the pre-tightening component is sleeved outside the bolt rod part 22 and is positioned between the bolt head part 21 and the nut 5 in a pre-tightening state, and the pre-tightening component is arranged between the nut 5 and the bolt head part 21 and is used for limiting the relative rotation of the bolt rod part 22 along the radial direction of the bolt rod part under the screwing action of the nut 5 so as to ensure that the bolt rod part can form the elongation to be measured, specifically, the pre-tightening component respectively presses against the thread head part 21 and the nut 5 under the action of the pre-tightening force, namely, the pre-tightening component is in surface-surface contact and is mutually clung to ensure that the pre-tightening component, namely, the first sleeve 3 (detailed below) and the second sleeve 4 (detailed below), do not generate relative motion with the bolt rod part 22 along the length direction and the radial direction of the bolt rod part 22 under the action of the pressing force of the nut 5; the detection component is fixedly connected with the bolt rod part 22, is respectively arranged at two sides of the nut 5, and synchronously moves along the length direction of the bolt rod part 22 with the bolt rod part 22 under the screwing action of the nut 5 and is used for measuring the elongation of the bolt to be measured.

According to the utility model, the detection assembly is fixed on the bolt rod part, the screw-tightening movement of the nut can drive the part on the bolt rod part in threaded connection with the screw-tightening assembly to extend along the length direction of the part far away from the bolt head part by utilizing the pretightening force between the nut and the pretightening assembly, so that the detection assembly which moves synchronously with the bolt rod part can accurately measure the actual elongation of the bolt, and the detection assembly has the advantages of simple structure and convenience in assembly and disassembly, can detect the elongation of the bolt part length, eliminates accumulated errors caused by detecting the elongation of the whole bolt length, and improves the detection precision of the bolt elongation.

As a preferred embodiment, as shown in fig. 2 and 3, the detecting assembly includes a fixing block 1 screw-coupled with a bolt shaft 22 and a locking pin 10 penetrating the fixing block 1 for fixedly mounting the fixing block 1 on the bolt shaft 22, the fixing block 1 being provided with a displacement sensor (not shown) for detecting a moving distance of the fixing block 1 in a length direction of the bolt shaft 22, the fixing block 1 being coupled with an end of the bolt shaft 22 remote from the nut 5, by providing a pin hole or a mounting hole having a screw structure on the fixing block 1, and providing a blind hole or a slot (not shown) for insertion of the locking pin 10 or a screw at a position on the bolt shaft 22 corresponding to the pin hole or the mounting hole having a screw structure for fixing the fixing block 1 on the bolt shaft 22, the fixed block 1 and the bolt rod portion 22 can synchronously move along the length direction, a displacement sensor (not shown) is embedded in the end face of the fixed block 1, which is close to the nut 5, the displacement sensor is used for detecting the distance change of the fixed block 1 along the length direction of the bolt rod portion 22 in real time to obtain the actual elongation of the bolt, the actual elongation is read (the displacement sensor is communicated with an external data display screen and used for displaying the value of the actual elongation) and whether the actual elongation exceeds the preset elongation is judged to confirm whether the bolt meets the design requirement or not, a special measuring tool is not needed to be used for reducing the cost, the method can also be suitable for measuring the elongation of a large number of bolts, the detection efficiency of batch measurement is improved, and the preset elongation is based on the length of a bolt stretching area section, the cross section area of the bolt rod part and the preparation material of the bolt calculate the extension length of the bolt rod part reaching the yield point of the material after the bolt rod part is screwed down, and when the actual extension amount of the bolt can reach or exceed the preset extension amount, the bolt can realize the optimal screwing effect.

As another preferred embodiment, as shown in fig. 2 and 3, the detecting device further comprises a fixing component sleeved outside the bolt shaft portion 22, the fixing component is located between the nut 5 and the detecting component, the detecting component extends at least partially into the fixing component, and the fixing component is connected with the nut 5 and rotates synchronously with the nut 5 under the rotation action of the nut 5.

As other alternative embodiments.

Preferably, as shown in fig. 3, the fixing assembly includes a fixing sleeve 7 sleeved outside the bolt shaft 22, the detecting assembly includes a fixing block 1 screwed with the bolt shaft 22, a cavity is provided between the fixing sleeve 7 and the bolt shaft 22, at least part of the fixing block 1 extends into the cavity, a detecting mark for measuring the elongation to be measured is provided on the part of the fixing block 1 located in the cavity, the detecting mark is a scale mark (not shown in the drawing) and is disposed on the fixing block 1 to a position on the fixing sleeve 7 far away from the end face of the nut 5, where the distance h is equal to the preset elongation of the fixing block 1 moving along the length direction of the bolt shaft 22, i.e. when the fixing block 1 and the bolt shaft 22 synchronously move along the length direction of the bolt shaft 22 until the scale mark extends out of the cavity, it can be determined that the actual elongation to be measured meets the design requirement, thereby realizing accurate determination of whether the actual elongation meets the requirement of the preset elongation.

Preferably, as shown in fig. 2 and 3, the detection assembly further includes a locking pin 10 passing through the fixing block 1 for fixedly mounting the fixing block 1 on the bolt shank 22.

Preferably, as shown in fig. 2 and 3, the fixing block 1 is provided with a displacement sensor (not shown in the drawings) for detecting a moving distance of the fixing block 1 in a length direction of the bolt shank 22.

Preferably, as shown in fig. 1, the fixing assembly further comprises a magnetic attraction block 6 sleeved outside the bolt shaft portion 22, the magnetic attraction block 6 is fixedly connected with the fixing sleeve 7 and located between the fixing sleeve 7 and the nut 5, the magnetic attraction block 6 is in adsorption connection with the nut 5, the fixing sleeve 7 comprises two semi-cylindrical mounting blocks, a positioning pin 8 for positioning the two mounting blocks and a fastening screw 9 for fixedly connecting the two mounting blocks, and each mounting block is provided with a positioning pin hole 80 for installing the positioning pin 8 and a threaded hole 90 for installing the fastening screw 9.

Preferably, as shown in fig. 2 and 3, the pre-tightening assembly comprises a first sleeve 3 and a second sleeve 4 which are sleeved on the bolt rod 22, the first sleeve 3 is arranged between the bolt head 21 and the second sleeve 4 in a pre-tightening state, the second sleeve 4 is arranged between the first sleeve 3 and the nut 5 in a pre-tightening state, the pre-tightening assembly comprises the first sleeve 3 and the second sleeve 4, the first sleeve 3 is sleeved outside the bolt rod 22 and is positioned between the bolt head 21 and the second sleeve 4, the second sleeve 4 is sleeved outside the bolt rod 22 and is positioned between the first sleeve 3 and the nut 5, two end faces of the first sleeve 3 are respectively abutted with the end face, close to the bolt head 21, on the second sleeve 4 and the end face, close to the bolt rod 22, on the bolt head 21, the other end face of the second sleeve 4 is in contact with the end face of the nut 5, which is close to the bolt head 21, and the first sleeve 3 and the second sleeve 4 are pressed between the bolt head 21 and the nut 5 by the screwing operation of the nut 5 on the bolt shaft 22, and the movement along the longitudinal direction and the radial direction of the bolt shaft 22 is restricted due to the fact that the first sleeve 3 and the second sleeve 4 are in a pre-tightening state, that is, a pressing state, between the nut 5 and the bolt head 21, and the detection accuracy of the elongation is prevented from being affected by the movement along the longitudinal direction and the radial direction in the process of detecting the elongation of the bolt.

It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The utility model is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here for the sake of brevity.

The foregoing is merely exemplary of the present application and is not limited thereto. Various modifications and alterations of this application will become apparent to those skilled in the art without departing from the scope of this utility model. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims

1. A detection device for measuring the elongation of a bolt, wherein the bolt (2) comprises a bolt head (21) and a bolt rod (22) which are fixedly connected, and the bolt rod (22) is provided with threads; the detection device is characterized by comprising:

the nut (5) is in threaded connection with the bolt rod part (22), and the bolt rod part (22) extends along the length direction of the bolt rod part (22) under the rotation action of the nut (5) so as to form the elongation to be measured;

the pre-tightening assembly is sleeved outside the bolt rod part (22) and is positioned between the bolt head part (21) and the nut (5) in a pre-tightening state;

the detection assembly is fixedly connected with the bolt rod part (22), the detection assembly and the pre-tightening assembly are respectively arranged on two sides of the nut (5), and synchronously move along the length direction of the bolt rod part (22) and are used for measuring the elongation under the rotation action of the nut (5) and the bolt rod part (22).

2. The detection device for measuring an elongation of a bolt according to claim 1, characterized in that the detection assembly comprises a fixing block (1) screwed with the bolt shank (22) and a locking pin (10) penetrating through the fixing block (1) for fixedly mounting the fixing block (1) on the bolt shank (22), the fixing block (1) being provided with a displacement sensor for detecting a moving distance of the fixing block (1) in a length direction of the bolt shank (22).

3. The device for measuring the elongation of a bolt according to claim 1, further comprising a fixing assembly sleeved outside the bolt shank (22), the fixing assembly being located between the nut (5) and the detecting assembly, the detecting assembly extending at least partially into the fixing assembly, the fixing assembly being connected to the nut (5) and rotating synchronously with the nut (5) under the effect of the rotation of the nut (5).

4. A detection device for measuring elongation of a bolt according to claim 3, characterized in that the fixing assembly comprises a fixing sleeve (7) sleeved outside the bolt shaft (22), the detection assembly comprises a fixing block (1) in threaded connection with the bolt shaft (22), a cavity is arranged between the fixing sleeve (7) and the bolt shaft (22), at least part of the fixing block (1) extends into the cavity, and the part of the fixing block (1) located in the cavity is provided with a detection mark for measuring the elongation.

5. The device for measuring the elongation of a bolt according to claim 4, characterized in that the detection assembly further comprises a locking pin (10) passing through the fixing block (1) for fixedly mounting the fixing block (1) on the bolt shank (22).

6. The detection device for measuring an elongation of a bolt according to claim 5, wherein the fixed block (1) is provided with a displacement sensor for detecting a moving distance of the fixed block (1) in a length direction of the bolt shank (22).

7. The device for measuring bolt elongation according to claim 4, wherein the fixing assembly further comprises a magnetic attraction block (6) sleeved outside the bolt shaft portion (22), the magnetic attraction block (6) is fixedly connected with the fixing sleeve (7) and located between the fixing sleeve (7) and the nut (5), and the magnetic attraction block (6) is in adsorption connection with the nut (5).

8. The device for measuring the elongation of a bolt according to claim 7, characterized in that the fixing sleeve (7) comprises two semi-cylindrical mounting blocks, as well as a locating pin (8) for locating the two mounting blocks and a fastening screw (9) for fixedly connecting the two mounting blocks.

9. The device for measuring the elongation of a bolt according to claim 8, wherein each of the mounting blocks is provided with a dowel hole (80) for mounting the dowel pin (8) and a screw hole (90) for mounting the fastening screw (9).

10. The detection device for measuring the elongation of a bolt according to claim 1, wherein the pre-tightening assembly comprises a first sleeve (3) and a second sleeve (4) which are both sleeved on the bolt shaft portion (22), the first sleeve (3) is arranged between the bolt head portion (21) and the second sleeve (4) in a pre-tightening state, and the second sleeve (4) is arranged between the first sleeve (3) and the nut (5) in a pre-tightening state.