CN210005148U - bolts capable of detecting bolt axial force - Google Patents
bolts capable of detecting bolt axial force Download PDFInfo
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- CN210005148U CN210005148U CN201921145948.0U CN201921145948U CN210005148U CN 210005148 U CN210005148 U CN 210005148U CN 201921145948 U CN201921145948 U CN 201921145948U CN 210005148 U CN210005148 U CN 210005148U
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- bolt
- sighting rod
- internal thread
- axial force
- rod
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Abstract
The utility model discloses a bolt of detectable bolt axial force, a serial communication port, including bolt and sighting rod, the bolt includes bolt head and screw rod, the bolt head corresponds central through-hole with the screw rod is inside, the sighting rod correspondence sets up inside central through-hole, the both ends of bolt centre bore set up internal thread and second internal thread respectively, the sighting rod includes sighting rod head, transition portion and sighting rod body, transition portion end links to each other with the sighting rod head, and end links to each other with the sighting rod body in addition, transition portion corresponds with internal thread and sets up external screw thread, sighting rod body length is greater than the screw rod, monitors the axial force of bolt through the measurement to sighting rod free end face and screw rod free end face distance, judges the state of screwing up of bolt.
Description
Technical Field
The utility model relates to a bolt axial force detects technical field, in particular to detectable bolt axial force's bolt and detection method thereof.
Background
The bolt connection is used as convenient and reliable connection modes which are widely applied to various industries, and for the influence of factors such as complex alternating load, temperature load and the like generally born by a high-strength pre-tightening bolt in the use process, plastic elongation of the bolt, embedding or collapse of a connecting piece, creep of materials and the like, the axial pre-tightening force of the bolt can be lost to different degrees, so that the bolt connection is damaged.
Besides, patent technologies relate to a flat pad or an elastic gasket capable of detecting the axial force of the bolt, but the gasket is complex in structure and needs to have enough thickness to only adapt to the occasion of large-size bolt connection.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a bolt of detectable bolt axial force detects bolt axial force based on the change of bolt body length itself, and simple structure, application scope .
In order to solve the problems, the utility model adopts the technical scheme that bolts capable of detecting bolt axial force comprise a bolt and a marker post, the bolt comprises a bolt head and a screw rod, the bolt head corresponds to a central through hole with the inside of the screw rod, the marker post corresponds to be arranged inside the central through hole, the two ends of the bolt central hole are respectively provided with a internal thread and a second internal thread, the marker post comprises a marker post head, a transition part and a marker post body, the end of the transition part is connected with the marker post head, the end is connected with the marker post body, the transition part corresponds to be provided with a external thread with a internal thread, and the length of the marker post body is greater than the screw rod.
The aperture of the central through hole is not more than half of the nominal diameter of the screw, and the length of the th internal thread and the second internal thread is 3-5 times of the thread pitch.
When the buoy is used, the buoy penetrates into the central through hole of the bolt, the th internal thread is meshed with the th external thread of the transition part, and the buoy and the bolt are fixed at .
The distance that the free end of the mark post body stretches out of the free end face of the screw rod is larger than 5mm, and the difference between the diameter of the mark post body and the diameter of the central through hole is set to be 0.1-1.5 mm.
The thermal expansion coefficients of the screw and the mark post are the same.
The utility model has the advantages that:
the utility model provides a but the bolt of detection bolt axial force direct application in bolted connection's engineering is actual, the bolt body is under the axial tension load effect, the elasticity extension of production, and the sighting rod body does not receive the influence of this load, consequently the distance between bolt body free end face and the sighting rod body free end face will change, through measuring the distance between the both ends face, can obtain the axial force of bolt and the state of screwing up, under through record initial condition and bolt pretension state, the distance of the corresponding terminal surface of bolt body free end face and sighting rod body, and the bolt pretightning force of exerting under the pretension state, measure the distance of both ends face under the operating condition, through calculating, can obtain the bolt axial force under this state.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic partial cross-sectional view of the present invention;
FIG. 3 is a schematic view of the bolt body construction;
FIG. 4 is a schematic view of a post construction;
fig. 5 is a schematic view of the initial state of the present invention;
fig. 6 is a schematic view of the pre-tightening state of the present invention;
fig. 7 is a schematic view of the working state of the present invention.
In the figure:
1-bolt, 101-bolt head, 102-bolt, 121-bolt free end, 103-central through hole, 131- th internal thread, 132-second internal thread, 2-marker post, 201-marker post head, 202-transition part, 221- th external thread, 203-marker post body and 231-marker post free end.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the following explains the present solution by way of specific embodiments and with reference to the accompanying drawings.
As shown in fig. 1 to 7, kinds of bolts capable of detecting bolt axial force include a bolt 1 and a marker post 2, where the bolt 1 includes a bolt head 101 and a screw 102, the bolt head and the inside of the screw 102 of 101 correspond to a central through hole 103, the marker post 2 is correspondingly disposed inside the central through hole 103, two ends of the central through hole 103 are respectively provided with a th internal thread 131 and a second internal thread 132, the marker post 2 includes a marker post head 201, a transition portion 202 and a marker post body 203, an end of the transition portion 202 is connected to the marker post head 201, an end of the transition portion is connected to the marker post body 203, the transition portion 202 and the th internal thread 131 are correspondingly provided with a th external thread 221, and the length of the marker post body 203 is greater than that of the screw 102.
The aperture of the central through hole 103 is not more than times of the nominal diameter of the screw 102, and the length of the th internal thread 131 and the second internal thread 231 is 3-5 times of the thread pitch, which is 4 times.
In use, the marker post 2 is inserted into the central through hole 103 of the bolt 1, the th internal thread 131 is meshed with the th external thread 221 of the transition part 202, and the marker post 2 and the bolt 1 are fixed at ;
the utility model discloses an in addition kind of embodiments are, penetrate sighting rod 2 in bolt 1's central through-hole 103, the second internal thread 132 meshes with the external thread 221 of transition portion 202, make sighting rod 2 and bolt 1 fix in and play
The distance that the sighting rod free end 232 of sighting rod body 203 stretches out the screw rod free end 121 of screw rod 102 is greater than 5mm, and this distance can change under the bolt different states, can obtain the axial force and the bolt tightening state of bolt through the measurement to this distance change, the difference between the diameter of sighting rod body 203 and the diameter of central through-hole 103 sets up to 1mm, guarantees the independence of warping between sighting rod body 203 and the screw rod 102.
The thermal expansion coefficients of the bolt 1 and the mark post 2 are the same.
A method for detecting a bolt capable of detecting the axial force of the bolt, which is used for detecting the bolt, comprises the following steps:
(1) measuring and recording the distance l between the free end 232 surface of the mark post body and the free end surface 121 of the screw 102 in the initial state0；
(2) Pre-tightening the bolt, and recording the pre-tightening force F applied during pre-tighteningMAnd the distance l between the free end 232 surface of the subscript rod and the free end 121 surface of the subscript rod in a pre-tightening stateM；
(3) Measuring the distance l between the free end 232 surface of the lower screw rod and the free end 121 surface of the screw rod in the working statet；
(4) Calculating the axial force F of the bolt in the working state by using a bolt axial force measurement formulatAnd the critical axial force F of the boltMA comparison is made.
The bolt axial force measurement formula in the step (4) is
Specifically, the free end 231 of the mark post is machined, so that the distance between the free end 121 of the screw rod and the free end 232 of the mark post in the initial state is the end face distance l corresponding to the force of the bolt connecting shaft0That is, the distance l between the free end 121 of the screw and the free end 232 of the post when the axial force of the bolt is reduced to the critical axial forceMIn the bolt fastening state, the free end 232 of the mark post is recessed in the free end 121 of the screw, the states of the free end 121 of the screw and the free end 232 of the mark post are monitored in real time through infrared or contact means, and if the free end 232 of the mark post protrudes out of the end surface of the free end 121 of the screw, the axial force of the bolt is reduced to the critical stateAnd then an alarm is given.
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations are also considered as the protection scope of the present invention.
Claims (4)
- The utility model provides a detectable bolt axial force's bolt, a serial communication port, including bolt and sighting rod, the bolt includes bolt head and screw rod, the bolt head corresponds central through-hole with the screw rod is inside, the sighting rod corresponds and sets up inside central through-hole, the both ends of central through-hole set up internal thread and second internal thread respectively, the sighting rod includes sighting rod head, transition portion and sighting rod body, transition portion end links to each other with the sighting rod head, and end links to each other with the sighting rod body in addition, transition portion corresponds with internal thread and sets up external thread, and internal thread and external thread mesh, sighting rod body length is greater than screw rod length.
- 2. The bolt capable of detecting bolt axial force according to claim 1, wherein the aperture of the central through hole is not more than half of the nominal diameter of the screw, and the length of the th internal thread and the second internal thread is 3-5 times of the thread pitch.
- 3. The bolt capable of detecting the bolt axial force according to claim 1, wherein the distance that the free end of the target body extends out of the end face of the free end of the screw rod is more than 5mm, and the difference between the diameter of the target body and the diameter of the central through hole is set to be 0.5-1.5 mm.
- 4. The bolt capable of detecting bolt axial force according to claim 1, wherein the screw and the target have the same coefficient of thermal expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921145948.0U CN210005148U (en) | 2019-07-19 | 2019-07-19 | bolts capable of detecting bolt axial force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921145948.0U CN210005148U (en) | 2019-07-19 | 2019-07-19 | bolts capable of detecting bolt axial force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210005148U true CN210005148U (en) | 2020-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921145948.0U Active CN210005148U (en) | 2019-07-19 | 2019-07-19 | bolts capable of detecting bolt axial force |
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| CN (1) | CN210005148U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285913A (en) * | 2019-07-19 | 2019-09-27 | 青岛四方庞巴迪铁路运输设备有限公司 | Bolt capable of detecting axial force of bolt and detection method thereof |
-
2019
- 2019-07-19 CN CN201921145948.0U patent/CN210005148U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285913A (en) * | 2019-07-19 | 2019-09-27 | 青岛四方庞巴迪铁路运输设备有限公司 | Bolt capable of detecting axial force of bolt and detection method thereof |
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Address after: No.86, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province Patentee after: Qingdao Sifang Alstom railway transportation equipment Co.,Ltd. Address before: No.86, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province Patentee before: BOMBARDIER SIFANG (QINGDAO) TRANSPORTATION Ltd. |