CN210572132U - Ultrasonic detection device for detecting fracture of in-service bolt - Google Patents
Ultrasonic detection device for detecting fracture of in-service bolt Download PDFInfo
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- CN210572132U CN210572132U CN201921023376.9U CN201921023376U CN210572132U CN 210572132 U CN210572132 U CN 210572132U CN 201921023376 U CN201921023376 U CN 201921023376U CN 210572132 U CN210572132 U CN 210572132U
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Abstract
The utility model discloses a be used for detecting at the cracked ultrasonic detection device of labour bolt, a serial communication port, including being used for can encourage and receive the high frequency, the narrow pulse of broadband, the straight probe of supersound of high amplitude and high sensitivity longitudinal wave, the outside cover that the probe was directly connected to the supersound has the shell, be equipped with spring assembly and baffle between the straight probe of supersound and the shell, the one end of the straight probe of supersound and the one end fixed connection of baffle, spring assembly's one end is fixed on the baffle, the other end of spring assembly and the one end fixed connection of shell, the other end of the straight probe of supersound is connected with the one end that is used for being connected the signal connection line. Compared with the prior art, the utility model has the advantages of it is following: the in-service bolt is detected without being disassembled; the potential safety hazard of bolt fracture is discovered, and the safe operation of the bolt is ensured; the detection precision is higher, and the result is more accurate; the accuracy of judging the defects is improved; simple to operate liberates measurement personnel both hands, improves detection efficiency.
Description
Technical Field
The utility model relates to a be used for detecting at the cracked ultrasonic detection device of labour bolt for detect at the cracked degree of labour bolt, belong to special equipment and detect technical field.
Background
The stud bolt is mainly used for connecting workpieces with larger thickness and is a connecting piece which is widely applied in engineering and very important. Because the thickness of the connected workpiece is larger, the bolt bears huge shear stress, so that the stud is more prone to fracture, and in recent years, more bolt fracture accidents occur in China, so that the safety of the bolt is guaranteed to be of great importance. The current inspection method for bolts mainly aims at manufacturing stages or disassembled bolts. The traditional bolt detection method needs to stop the device or equipment and stop production, so that the bolt can be detached and detected. The loss of parking and stopping production for detecting the bolt is undoubtedly enormous. Meanwhile, the construction environment for disassembling and assembling the bolt on site is worse than that in the manufacturing stage, and the high-quality working condition of the bolt after being re-assembled is difficult to guarantee, so that the non-disassembly detection of the bolt in service is difficult to realize.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the problem of how to detect the degree of rupture of bolt in active service is solved.
In order to solve the technical problem, the technical scheme of the utility model a be used for detecting at the cracked ultrasonic detection device of labour bolt is provided, a serial communication port, including being used for exciting and receiving the high frequency, the narrow pulse of broadband, the straight probe of supersound of high amplitude and high sensitivity longitudinal wave, the outside cover of the straight probe of supersound has the shell, be equipped with spring assembly and baffle between the straight probe of supersound and the shell, the one end of the straight probe of supersound and the one end fixed connection of baffle, spring assembly's one end is fixed on the baffle, spring assembly's the other end and the one end fixed connection of shell, the other end of the straight probe of supersound is connected with the one end that is used for the signal connection line of host.
Preferably, the signal connection line is a high-frequency high-precision ultrasonic connection line, the interface on the probe side of the signal connection line is an L5 interface, and the interface on the host side of the signal connection line is a C9/Q6/Q9 interface.
Preferably, the excitation frequency of the ultrasonic straight probe is greater than 10MHz, the pulse width is less than 30ns, and the excitation voltage is 200V-700V.
Preferably, the ultrasonic straight probe is of a cylindrical structure, and the wafer contact surface at the bottom of the ultrasonic straight probe is the same as the end surface of the bolt to be detected in size.
Preferably, the shell is an aluminum alloy shell, and the thickness of the shell is not less than 1 mm.
Preferably, the lower part of the inner wall of the shell is provided with threads for matching a bolt to be detected, and the threads are at least 3 circles; the upper part of the inner wall of the shell is of a smooth thread-free structure for the baffle to slide up and down.
Preferably, the spring device is a compression spring, an ultrasonic straight probe is arranged in the compression spring, the specification of the compression spring is that the diameter of a material is 0.40mm, and the free length of the compression spring is flush with the ultrasonic straight probe and the bottom surface of the shell respectively; the accuracy of the stiffness, outer diameter and free length of the compression spring is 3 levels.
Preferably, the baffle is of an annular structure and is welded with one end of the spring device; the inner ring side of the baffle is welded and fixed outside the ultrasonic straight probe, and a gap is arranged between the outer ring side of the baffle and the inner wall of the shell.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the in-service bolt is detected without being disassembled;
(2) the cross section loss amount of the bolt on site is obtained according to a bolt judgment curve measured in a laboratory, the potential safety hazard of bolt fracture is found, the safety of the bolt is further judged, and the safe operation of the bolt is ensured;
(3) the high-frequency, wide-band, narrow-pulse and high-amplitude longitudinal waves are adopted for detection, other interference waveforms can be effectively eliminated, defect signals are found, the detection precision is higher, and the result is more accurate;
(4) the excitation pulse is a broadband narrow pulse signal, and diffraction waves are formed in the bolt, so that the interior of the bolt is filled with sound waves, and full-volume detection is realized; meanwhile, the method is beneficial to finding larger cracks in the bolt, and the size of the cracks is calculated by utilizing a time difference method of diffracted waves at the tips of the cracks;
(5) the fixing device and the probe pressing structure are designed at the front end, so that the detection site and a laboratory have the same detection conditions, the error of manually placing the probe is avoided, and the accuracy of judging the defects is improved;
(6) simple to operate liberates measurement personnel both hands, improves detection efficiency.
Drawings
FIG. 1 is a front view of an ultrasonic testing apparatus for testing for bolt in service fracture;
FIG. 2 is a bottom view of an ultrasonic testing device for testing for bolt in service fracture;
FIG. 3 is a schematic diagram of an ultrasonic inspection apparatus for detecting bolt fracture in service;
fig. 4 is a decision curve of an ultrasonic detection apparatus for detecting a fracture of an in-service bolt.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
The utility model relates to a be used for detecting at the cracked ultrasonic detection device of labour bolt for detect at the degree of rupture of labour bolt, this detection device is at the front end design fixed knot of the straight probe 2 of supersound and is constructed, guarantees the abundant contact of the straight probe 2 of supersound and 6 terminal surfaces of bolt, makes and examine time measuring the acquisition and the same testing result in laboratory at the scene. The host machine analyzes the received signals, obtains the section loss amount of the bolt on site according to a bolt judgment curve measured in a laboratory, and further judges the safety of the bolt 6.
As shown in fig. 1 and 2, each part in the present embodiment functions as: the signal connecting line 1 is used for connecting the ultrasonic straight probe 2 and the host; the two ultrasonic straight probes 2 are used for exciting and receiving high-frequency, broadband and narrow-pulse longitudinal waves with high amplitude and high sensitivity, one ultrasonic straight probe 2 is used for exciting ultrasonic waves during detection, and the other ultrasonic straight probe 2 is used for receiving ultrasonic signals; the shell 3 is used for packaging the body structure; the spring device 4 is used for pressing the ultrasonic straight probe 2 and the end face of the bolt 6, and the pressure stress is kept basically consistent; and the baffle 5 is used for abutting against the spring, so that the pressure stress of the spring acts on the ultrasonic straight probe 2.
The signal connecting line 1 is a high-frequency high-precision ultrasonic connecting line, the interface of the probe side can be an L5 interface, and the interface of the host side can be an interface type such as C9/Q6/Q9. The ultrasonic straight probe 2 can excite and receive longitudinal waves with high frequency, wide frequency band, narrow pulse, high amplitude and high sensitivity. The excitation frequency is more than 10MHz, the pulse width is less than 30ns, and the excitation voltage is 300V. The ultrasonic straight probe 2 is of a cylindrical structure, and the contact surface of the bottom wafer is the same as the end surface of the bolt 6 to be detected in size.
When the bolt in service is detected, the bolt is installed in a workpiece, the surface of the bolt 6 is in contact with objects such as a nut 7, the workpiece 8 and the like, and sound wave attenuation and interference signals exist during detection. Therefore, the key of detection is to improve the amplitude of the excitation signal, eliminate the interference signal and improve the detection precision. The excitation voltage of 300V can generate sound waves with sufficient amplitude. The longitudinal wave is the waveform with the fastest propagation speed, and the sound velocity in steel can reach 5900 m/s. During detection, longitudinal wave signals can be collected by the receiving probe firstly, and other sound waves are later than the longitudinal waves. Therefore, the longitudinal wave is adopted to be beneficial to eliminating the interference of the deformation wave. The root of the in-service bolt breakage is that the bolt generates fine cracks under the condition that the bolt bears shear stress for a long time, and the cracks are expanded to finally cause breakage accidents. Exciting ultrasonic signals at high frequencies greater than 10MHz facilitates finding small defects in the bolt. The excitation pulse is a broadband narrow pulse signal, and diffraction waves are formed in the bolt, so that the interior of the bolt is filled with sound waves, and full-volume detection is realized. Meanwhile, the method is beneficial to finding larger cracks in the bolt, and the size of the cracks is calculated by utilizing a time difference method of diffracted waves at the tips of the cracks.
In this embodiment, the excitation frequency is 10MHz, the pulse width is 30ns, and the excitation voltage is 300V. The probe is cylindrical and the bottom wafer contact surface is 30mm in diameter for testing M30 x 180 bolts.
The shell 3 is an aluminum alloy shell, and the thickness is not less than 1 mm. Threads are machined on the lower portion of the inner wall of the housing for mating with the bolt to be tested, the threads making at least 3 turns. On the inner wall is smooth and unthreaded for sliding of the baffle 5.
According to the relevant bolt installation requirements of China, such as GB 50231< < general construction and acceptance standards of mechanical equipment installation engineering > and the like, 2-3 screw pitches of the bolt are exposed out of the nut, so that at least 3 circles of threads are formed in the shell 3 and used for installing the probe on the bolt.
In this embodiment, the thickness of the housing 3 is 1 mm; the lower part of the inner wall of the shell is provided with 3 circles of threads.
The spring device 4 is a compression spring fixed inside the shell 3, and the ultrasonic straight probe 2 is placed in the compression spring. The specification of the compression spring is that the diameter of the material is 0.40mm, the free length of the compression spring is ensured to be flush with the bottom surfaces of the probe 2 and the shell 3, in the embodiment, the free length is 45mm, the precision of rigidity, outer diameter and free length is 3 grades, and the parameters can ensure that sufficient pressing force and stress precision are consistent. The material is stainless steel wire for the spring, can guarantee the durability of spring. The baffle 5 is of an annular structure and is welded with the spring device 4. The inner ring side is welded and fixed outside the probe, and the gap between the outer ring side and the inner wall of the shell 3 is 0.1 mm.
The utility model discloses an use the schematic diagram as shown in fig. 3, before installation detection device, need clear up and polish two terminal surfaces of bolt 6 for two terminal surfaces of bolt 6 are level and smooth bright and clean and scribble the couplant. When the ultrasonic straight probe is used, the two ultrasonic straight probes 2 are respectively arranged on the bolt 6 at the positions where the nuts 7 are exposed, and are rotated by 2-3 screw pitches.
Before the detection, a simulation workpiece which is basically consistent with the material of the detected object is manufactured. According to the detection requirement, the circumferential notches with different depths can be cut on the bolt 6 on the joint surface of the workpiece 8 for simulating bolt fracture, in the embodiment, the circumferential notches with the cutting depths of 3mm, 6mm and 12mm on the bolt on the joint surface of the workpiece 8 are used for simulating 10%, 20% and 40% of bolt section loss, and the drawing judgment curve is shown in fig. 4. During detection, the amplitude of the transmitted wave is compared to a decision curve by measurement. And when the amplitude of the detection signal is larger than the amplitude on the corresponding judgment curve, the detection signal is qualified. In this embodiment, when the amplitude of the detection signal is greater than 10% and corresponds to the amplitude on the determination curve, the detection signal is qualified. And if the amplitude is lower than the judgment curve, the test piece is judged to be unqualified. For defect judgment, the corresponding fracture degree can be searched on the judgment curve by the defect amplitude. The utility model discloses a device adopts the detection mode of sending out one and receiving, also can adopt the detection mode of sending out from receiving. The self-generating and self-receiving detection mode adopts an ultrasonic straight probe 2 to be arranged at one end of a bolt 6, the defect is judged according to the height of a reflected wave of the other section, and the manufacturing method of the judgment curve is similar to the one-generating and one-receiving mode.
The utility model discloses a device realizes detecting the bolt of not dismantling in labour, and traditional method mainly detects to the bolt of dismantling to get off. The device adopts high frequency, broadband narrow pulse, high amplitude's longitudinal wave to detect, can effectively get rid of other interference waveforms, discovers the defect signal, and the detection precision is higher, and the result is more accurate. The excited sound waves form diffraction waves in the bolt, so that the interior of the bolt is filled with the sound waves, and the full-volume detection is realized. When the device is detected, the loss amount of the cross section of the bolt on site is obtained through a judgment curve, and the safety of the bolt is further judged. The device designs fixing device and probe hold-down structure at the front end for the detection scene has the same detection condition with the laboratory, has avoided the artifical error of placing the probe, improves the accuracy of judging the defect. The device is convenient to mount, hands of detection personnel are liberated, and the detection efficiency is improved.
Example 2
The main structure of the present embodiment is the same as that of embodiment 1, except that the ultrasonic parameters and the size of the device are changed for detecting bolts with different specifications. The frequency of excitation is 13MHz in this example, the pulse width is 50ns, and the excitation voltage is 200V. The ultrasonic straight probe 2 is a cylindrical structure with a bottom wafer contact surface of 20mm diameter for testing M20 x 80mm bolts. The spring device 4 is a compression spring fixed inside the shell 3, and the ultrasonic straight probe 2 is placed in the compression spring. The diameter of the material of the compression spring is 0.40mm, the free length is 35mm, the precision of rigidity, outer diameter and free length is 3 grades, and the material is stainless steel wire for the spring.
Example 3
The main structure of the present embodiment is the same as that of embodiment 1, except that the ultrasonic parameters and the size of the device are changed for detecting bolts with different specifications. The frequency of excitation is 10MHz in this example, the pulse width is 100ns, and the excitation voltage is 600V. The ultrasonic straight probe 2 is a cylindrical structure with a bottom wafer contact surface diameter of 48mm for testing M48 x 300mm bolts. The spring device 4 is a compression spring fixed inside the shell 3, and the ultrasonic straight probe 2 is placed in the compression spring. The free length of the compression spring is 60mm, the accuracy of rigidity, outer diameter and free length is 3 grades, and the material is stainless steel wire for the spring.
Example 4
The main structure of the present embodiment is the same as that of embodiment 1, except that the ultrasonic parameters and the size of the device are changed for detecting bolts with different specifications. The frequency of excitation is 10MHz in this example, the pulse width is 50ns, and the excitation voltage is 250V. The ultrasonic straight probe 2 is a cylindrical structure with a bottom wafer contact surface of 36mm diameter for testing M36 x 210mm bolts. The spring device 4 is a compression spring fixed inside the shell 3, and the ultrasonic straight probe 2 is placed in the compression spring. The free length of the compression spring is 48mm, the accuracy of rigidity, outer diameter and free length is 3 grades, and the material is stainless steel wire for the spring.
Example 5
The main structure of the present embodiment is the same as that of embodiment 1, except that the ultrasonic parameters and the size of the device are changed for detecting bolts with different specifications. The frequency of excitation is 10MHz in this example, the pulse width is 100ns, and the excitation voltage is 700V. The ultrasonic straight probe 2 is a cylindrical structure with a bottom wafer contact surface of 42mm diameter for testing M42 x 250 bolts. The spring device 4 is a compression spring fixed inside the shell 3, and the ultrasonic straight probe 2 is placed in the compression spring. The diameter of the material of the compression spring is 0.40mm, the free length is 50mm, the precision of rigidity, outer diameter and free length is 3 grades, and the material is stainless steel wire for the spring.
Claims (8)
1. The utility model provides an ultrasonic detection device for detecting bolt fracture in labour, a serial communication port, including being used for can arouse and receive high frequency, the narrow pulse of broadband, the straight probe (2) of supersound of high amplitude and high sensitivity longitudinal wave, the outside cover of the straight probe (2) of supersound has shell (3), be equipped with spring assembly (4) and baffle (5) between the straight probe (2) of supersound and shell (3), the one end of the straight probe (2) of supersound and the one end fixed connection of baffle (5), the one end of spring assembly (4) is fixed on baffle (5), the other end of spring assembly (4) and the one end fixed connection of shell (3), the other end of the straight probe (2) of supersound is connected with the one end that is used for connecting signal connection line (1) of host computer.
2. The ultrasonic testing device for detecting bolt breakage in service according to claim 1, wherein the signal connection line (1) is a high-frequency high-precision ultrasonic connection line, the interface on the probe side of the signal connection line (1) is an L5 interface, and the interface on the host side of the signal connection line (1) is a C9/Q6/Q9 interface.
3. An ultrasonic testing device for detecting bolt in service fracture as claimed in claim 1, characterised in that the excitation frequency of the ultrasonic straight probe (2) is greater than 10MHz, the pulse width is less than 30ns, and the excitation voltage is 200V-700V.
4. An ultrasonic testing device for testing bolt breakage in service according to claim 1, characterised in that the ultrasonic straight probe (2) is of cylindrical configuration, and the wafer contact surface at the bottom of the ultrasonic straight probe (2) is of the same size as the end face of the bolt (6) to be tested.
5. An ultrasonic testing device for testing bolt breakage in service according to claim 1 wherein the housing (3) is an aluminum alloy housing and the thickness of the housing (3) is not less than 1 mm.
6. An ultrasonic testing device for testing bolt breakage in service according to claim 1 characterised in that the lower part of the inner wall of the housing (3) is provided with a thread for matching the bolt (6) to be tested, the thread being at least 3 turns; the upper part of the inner wall of the shell (3) is a smooth threadless structure for the baffle (5) to slide up and down.
7. An ultrasonic testing device for testing bolt breakage in service according to claim 1, wherein the spring device (4) is a compression spring, an ultrasonic straight probe (2) is arranged in the compression spring, the specification of the compression spring is that the material diameter is 0.40mm, and the free length of the compression spring is flush with the ultrasonic straight probe (2) and the bottom surface of the shell (3) respectively; the accuracy of the stiffness, outer diameter and free length of the compression spring is 3 levels.
8. An ultrasonic testing device for testing bolt breakage in service according to claim 1 characterised in that the baffle (5) is of annular configuration, the baffle (5) being welded to one end of the spring means (4); the inner ring side of the baffle (5) is welded and fixed outside the ultrasonic straight probe (2), and a gap is arranged between the outer ring side of the baffle (5) and the inner wall of the shell (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921023376.9U CN210572132U (en) | 2019-07-02 | 2019-07-02 | Ultrasonic detection device for detecting fracture of in-service bolt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921023376.9U CN210572132U (en) | 2019-07-02 | 2019-07-02 | Ultrasonic detection device for detecting fracture of in-service bolt |
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| CN210572132U true CN210572132U (en) | 2020-05-19 |
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| CN201921023376.9U Active CN210572132U (en) | 2019-07-02 | 2019-07-02 | Ultrasonic detection device for detecting fracture of in-service bolt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115950955A (en) * | 2023-03-13 | 2023-04-11 | 江苏交科能源科技发展有限公司 | Gantry crane bolt vibration monitoring method and system |
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2019
- 2019-07-02 CN CN201921023376.9U patent/CN210572132U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115950955A (en) * | 2023-03-13 | 2023-04-11 | 江苏交科能源科技发展有限公司 | Gantry crane bolt vibration monitoring method and system |
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