CN219799322U - Piston rod direct current detection device - Google Patents
Piston rod direct current detection device Download PDFInfo
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- CN219799322U CN219799322U CN202223275579.1U CN202223275579U CN219799322U CN 219799322 U CN219799322 U CN 219799322U CN 202223275579 U CN202223275579 U CN 202223275579U CN 219799322 U CN219799322 U CN 219799322U
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- 238000001514 detection method Methods 0.000 title claims abstract description 122
- 208000027418 Wounds and injury Diseases 0.000 claims abstract description 38
- 230000033001 locomotion Effects 0.000 claims abstract description 23
- 230000006378 damage Effects 0.000 claims abstract description 17
- 208000014674 injury Diseases 0.000 claims abstract description 13
- 239000000523 sample Substances 0.000 claims description 47
- 230000007246 mechanism Effects 0.000 claims description 31
- 230000005284 excitation Effects 0.000 claims description 13
- 230000035945 sensitivity Effects 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
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- 230000003287 optical effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model discloses a piston rod direct current detection device, and relates to the technical field of nondestructive detection; the device comprises a detection assembly for detecting axial injury and circumferential injury of a piston rod, and further comprises a driving assembly for driving the detection assembly to do axial relative motion and axial relative motion with the piston rod, wherein the driving assembly is connected with the detection assembly; the device has solved prior art's optics detection and electromagnetic detection mode, can't satisfy the piston rod of gate headstock gear and cover the greasy dirt, and surface coating metal coating to need carry out the problem of the demand of detecting a flaw under this kind of operating mode of on-line measuring, have simple structure and easily use, need not large-scale equipment, can carry out comprehensive accurate characteristics that detect to the damage condition of piston rod on line.
Description
Technical Field
The utility model relates to the technical field of nondestructive testing, in particular to a piston rod direct current detection device.
Background
The gate hydraulic hoist is important mechanical equipment in hydraulic engineering and is used for opening and closing a gate, wherein a piston rod is one of main components affecting the service life of the hydraulic hoist and directly affects the running state of the gate hoist; in long-term pressure-bearing work, the surface of a piston rod is easy to generate defects such as corrosion or cracks, oil leakage is caused when the hydraulic hoist works, and the locking is possibly generated at any time in the running process, so that a gate cannot be normally opened or closed, and the safety of a hydropower station is threatened. Therefore, surface defect detection is required to be carried out on the piston rod of the hydraulic hoist at regular intervals.
At present, the nondestructive detection method for detecting the surface defects of the piston rod comprises two main types, namely optical detection and electromagnetic detection, wherein the electromagnetic detection is commonly used for eddy current detection and magnetic leakage detection; the three detection modes have advantages, but for the technical field of the piston rod of the gate hoist, the following technical problems cannot be overcome:
1, optical detection has higher requirements on the surface condition of a piston rod; however, in the service engineering of the gate hoist, the piston rod works in a severe environment with silt, greasy dirt and water for a long time, so that soil and greasy dirt are often adhered to the surface of the piston rod, the surface defect of the piston rod is covered by the soil or the greasy dirt, and the optical detection cannot penetrate, so that missed detection can be caused;
2, exciting an alternating electromagnetic field through a coil arranged above the surface of the piston rod by an eddy current detection method, so that eddy current is generated in the piston rod, and flaw detection is realized through disturbance of defects on the eddy current; however, the surface of the piston rod is usually provided with a metal coating, so that excited vortex is concentrated in the coating and cannot penetrate into the piston rod, and the detection precision is greatly reduced;
3, magnetizing the piston rod to a near-saturation state through a magnetizer during detection by a magnetic leakage detection method, and picking up a leakage magnetic field generated by a defect through a magneto-sensitive sensor; for example, patent application number CN95212309.6 discloses a steel pipe magnetic leakage flaw detector, which detects flaw by performing saturation magnetization on a pipe to be detected and then detecting a magnetic leakage state; however, a larger magnetizer is often needed to magnetize the pipe fitting to be detected to a near-saturation state during magnetization, so that the pipe fitting to be detected is more suitable for independent detection after the pipe fitting to be detected is disassembled; in the utility model, the piston rod is positioned in the equipment and cannot be easily detached from the gate hoist for independent detection, and if the piston rod is to be detached, the whole hydroelectric generating set is required to be correspondingly detached and overhauled; therefore, the piston rod in the utility model needs to be detected on line, and the saturation magnetization cannot be carried out by adopting a large magnetizer.
In summary, the existing optical detection method and electromagnetic nondestructive detection method cannot completely meet the requirements of online, efficient and high-precision detection of the surface defects of the piston rod; therefore, a device for detecting the direct current on the piston rod is required to be designed to meet the requirements that the surface of the piston rod is covered with oil stains, the surface of the piston rod is coated with a metal coating, and the flaw detection under the working conditions of on-line detection is required.
Disclosure of Invention
In order to overcome the problems or at least partially solve the problems, the embodiment of the utility model provides a device for detecting the direct current of a piston rod, which solves the problems that the piston rod of a gate hoist cannot meet the requirements of on-line detection on the flaw detection requirements under the working conditions of oil stain coverage, metal coating on the surface and no need of on-line detection in the optical detection and electromagnetic detection modes in the prior art, and has the characteristics of simple structure, easy use, no need of large-scale equipment and capability of comprehensively and accurately detecting the damage condition of the piston rod on line.
In order to achieve the technical effects, the technical scheme provided by the utility model is as follows:
a piston rod direct current detection device comprises a detection assembly and a driving assembly; the detection assembly comprises a direct current excitation source and a detection probe, the detection probe is electrically connected with the A/D acquisition card and the processor, and the direct current excitation source is electrically connected with the piston rod to be detected to excite the piston rod along the axial direction.
Preferably, the signal output end of the detection probe is electrically connected with the signal input end of the amplifier, and the signal output end of the amplifier is electrically connected with the signal input end of the filter; the filter is electrically connected with the A/D acquisition card and the processor.
Further, an amplifier, a filter and an A/D acquisition card are electrically connected between the detection probe and the processor in sequence, and the detection signal is further processed and then sent to the processor for analysis.
Preferably, the detection probe is connected with a driving assembly, the driving assembly comprises a rotating mechanism and a travelling mechanism, the rotating mechanism drives the detection probe and the piston rod to do circumferential relative motion, and the axial injury of the piston rod is detected; the advancing mechanism drives the detection probe and the piston rod to do axial relative motion, and circumferential injury of the piston rod is detected.
Further, the rotating mechanism is used for manufacturing circumferential relative movement between the detection probe and the piston rod; the advancing mechanism is used for manufacturing axial relative movement between the detection probe and the piston rod; this movement can be applied to either the inspection probe or the piston rod.
Preferably, the detection probe comprises a hall element, an AMR sensor, a GMR sensor or a TMR sensor.
Preferably, the dc excitation source is an adjustable dc power supply.
Preferably, the detection probe is disposed directly opposite the piston rod surface.
Preferably, the direction of magnetic sensitivity of the detection probe is radially parallel to the piston rod.
The embodiment of the utility model has at least the following advantages or beneficial effects:
the embodiment of the utility model provides a device for detecting the open direct current of a piston rod, which is characterized in that when a target piston rod is required to be subjected to damage detection, the piston rod is excited in the axial direction through a detection component, and then the detection component and the piston rod perform circumferential relative movement through a driving component so as to detect the axial damage of the piston rod; the detection component and the piston rod do axial relative motion through the driving component so as to detect circumferential injuries of the piston rod. When detecting, the detection component analyzes and processes the detected signals, so that the flaw detection information of the piston rod is obtained, and the comprehensive, accurate and effective flaw detection of the piston rod is realized. The device has simple structure, does not need a magnetizer, and is suitable for high-speed and automatic detection of the piston rod; the axial wound and the circumferential wound can be detected simultaneously by adopting an axial direct current method; the utility model adopts an axial direct current method, has no skin effect and can detect internal and external injuries at the same time.
Drawings
Fig. 1 is a schematic structural diagram of a device for detecting a direct current flowing through a piston rod according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a principle of detecting the DC current applied to a piston rod in an embodiment of the present utility model;
FIG. 3 is a schematic diagram of axial wound detection in an embodiment of the present utility model;
FIG. 4 is a schematic view of an axial wound in an embodiment of the present utility model;
FIG. 5 is a schematic diagram showing the distribution of magnetic fields during circumferential flaw detection according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of circumferential wound field distribution in an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a driving mechanism in embodiment 3 of the present utility model;
FIG. 8 is a schematic front view of a driving mechanism in embodiment 3 of the present utility model;
FIG. 9 is a schematic cross-sectional view of a driving mechanism in embodiment 3 of the present utility model;
in the accompanying drawings: the device comprises a piston rod 1, a direct current excitation source 2, a detection probe 3, an amplifier 4, a filter 5, an A/D acquisition card 6, a processor 7, a rotating mechanism 8, a travelling mechanism 9, a base 10, an electric slide rail 11, a slide block 12, a clamp 13, a support ring 14, a toothed ring 15, a transmission piece 16, an axial wound 17 and a circumferential wound 18;
the arrow direction in fig. 1 indicates the current direction of the dc excitation source;
the arrow direction in fig. 2 indicates the direct current direction;
the arrow direction in fig. 3 indicates the direction of magnetic sensitivity.
Detailed Description
Example 1:
as shown in fig. 1-2, a device for detecting the direct current of a piston rod 1 comprises a detection assembly and a driving assembly; the detection assembly comprises a direct current excitation source 2 and a detection probe 3, the detection probe 3 is electrically connected with the A/D acquisition card 6 and the processor 7, and the direct current excitation source 2 is electrically connected with the piston rod 1 to be detected to excite the piston rod 1 along the axial direction.
Preferably, the signal output end of the detection probe 3 is electrically connected with the signal input end of the amplifier 4, and the signal output end of the amplifier 4 is electrically connected with the signal input end of the filter 5; the filter 5 is electrically connected with the A/D acquisition card 6 and the processor 7.
Further, an amplifier 4, a filter 5 and an A/D acquisition card 6 are electrically connected between the detection probe 3 and the processor 7 in sequence, and the detection signals are further processed and then sent to the processor 7 for analysis.
Preferably, the detection probe 3 is connected with a driving assembly, the driving assembly comprises a rotating mechanism 8 and a travelling mechanism 9, the rotating mechanism 8 drives the detection probe 3 and the piston rod 1 to do circumferential relative motion, and the axial injury 17 of the piston rod 1 is detected; the traveling mechanism 9 drives the detection probe 3 and the piston rod 1 to do relative axial movement, and detects the circumferential injury 18 of the piston rod 1.
Further, the rotation mechanism 8 is used for manufacturing a circumferential relative movement between the detection probe 3 and the piston rod 1; the travelling mechanism 9 is used for manufacturing the axial relative movement between the detection probe 3 and the piston rod 1; this movement can be applied either to the detection probe 3 or to the piston rod 1.
Preferably, the detection probe 3 comprises a hall element, an AMR sensor, a GMR sensor or a TMR sensor, and a suitable sensor element can be selected for detecting and acquiring data according to actual requirements.
Preferably, the direct current excitation source 2 is an adjustable direct current power supply, and excitation power supplies with different sizes can be provided according to different requirements.
Preferably, the detection probe 3 is arranged opposite to the surface of the piston rod 1.
Preferably, the direction of magnetic sensitivity of the detection probe 3 is radially parallel to said piston rod 1.
Example 2:
the working principle of the piston rod 1 direct current detection device is as follows:
when the target piston rod 1 needs to be subjected to wound detection, the piston rod 1 is excited in the axial direction by a direct current excitation source 2 in a detection assembly, and then a detection probe 3 in the detection assembly performs circumferential relative motion with the piston rod 1 through a rotating mechanism 8 in a driving assembly so as to detect the axial wound 17 of the piston rod 1; the detection probe 3 in the detection assembly is axially moved relative to the piston rod 1 by a travel mechanism 9 in the drive assembly to detect a circumferential wound 18 of the piston rod 1. When detecting, the detection probe 3 in the detection assembly transmits the detected signal to the amplifier 4 for amplification, then the signal is filtered by the filter 5 and then is sent to the processor 7 in the detection assembly for analysis and processing by the A/D acquisition card 6, so that the flaw detection information of the piston rod 1 is obtained, and the comprehensive, accurate and effective flaw detection of the piston rod 1 is realized. The flaw detection information of the piston rod 1 comprises the information of an axial flaw 17 and an axial flaw 17 of the piston rod 1; the specific detection principle is as follows:
as shown in fig. 3-4, the magnetic sensitivity direction of the detection probe 3 is parallel to the radial direction of the piston rod 1, and the normal magnetic field component is induced to change; the detection of the axial wound 17 is that the detection probe 3 picks up a leakage magnetic field signal generated by the axial wound 17 after the piston rod 1 is magnetized; the circumferential magnetic field inside the piston rod 1 leaks into the air through the axial wound 17 to form a leakage magnetic field, and through the circumferential movement of the detection probe 3, a leakage magnetic field signal generated by the axial wound 17 after the piston rod 1 is magnetized is picked up, so that the detection of the axial wound 17 of the piston rod 1 is realized.
As shown in fig. 5 to 6, the circumferential wound 18 is detected by picking up a magnetic field variation signal of the piston rod 1 caused by internal current disturbance by the detection probe 3; the circumferential wound 18 produces disturbance to the current in the piston rod 1, so that the current in the piston rod 1 produces a non-axial current density component, and the non-axial current density component changes the direction and the size of the magnetic field produced by the external magnetic field of the piston rod 1; when there is no defect, current j 0 Flows uniformly in the piston rod 1, and generates an external magnetic fieldBEven, when there is a circumferential wound 18, the current distribution is uneven, and the external magnetic field is distortedBBy detecting the axial movement of the probe 3, a magnetic field variation signal generated by the current in the piston rod 1 due to the disturbance of the circumferential wound 18 is picked up, so that the circumferential wound 18 of the piston rod 1 is detected.
After the piston rod 1 is electrified, current in the piston rod 1 flows along the axial direction, and a circumferential magnetic field is generated inside and outside the piston rod 1; for the axial wound 17, the direction is the same as the current direction, the current is almost not disturbed, but the magnetic field inside the piston rod 1 is along the circumferential direction, the internal magnetic field can leak into the air through the axial wound 17, and the magnetic field is similar to magnetic leakage detection in nature, and the magnetic sensor is used for circumferential movement detection; for the circumferential wound 18, the influence on the internal magnetic field is almost avoided, the leakage magnetic field is almost avoided, but the circumferential wound 18 generates larger disturbance on the current in the piston rod 1, the current generates non-axial current density components near the circumferential wound 18, and therefore the non-axial current density components generated by the disturbance can cause the change of the generation direction and the magnitude of the external magnetic field of the piston rod 1, and the axial movement detection is performed through the magnetic sensor; the utility model adopts an axial direct current method, and can detect the axial injury 17 and the circumferential injury 18 simultaneously; the utility model adopts an axial direct current method, has no skin effect and can detect internal and external injuries at the same time.
Example 3:
preferably, as shown in fig. 7 to 9, the driving mechanism has the following structure:
the driving mechanism comprises a rotating mechanism 8 and a travelling mechanism 9; the advancing mechanism 9 comprises a base 10, two ends of the upper surface of the base 10 are connected with clamps 13, the clamps 13 are of a ring structure consisting of two split semicircular rings, and the two split semicircular rings are connected and held tightly at two ends of the outer surface of the piston rod 1 through bolts; the upper surface of the base 10 is connected with an electric slide rail 11, and the upper surface of a slide block 12 of the electric slide rail 11 is connected with a rotating mechanism 8.
Further, the rotating mechanism 8 comprises a supporting ring 14, and the supporting ring 14 is connected with the upper surface of the sliding block 12; the center of the supporting ring 14 coincides with the axis of the piston rod 1; an annular chute is formed in one side surface of the support ring 14, a toothed ring 15 is connected in the annular chute in a sliding mode, and the detection probe 3 is connected to the inner wall of the toothed ring 15 and faces the piston rod 1.
Further, the rotating mechanism 8 comprises a transmission piece 16 connected with the upper surface of the sliding block 12, the transmission piece 16 comprises a motor and a gear connected with the end part of the motor, the gear is meshed with the toothed ring 15, and the toothed ring 15 is driven to rotate along the annular sliding groove, so that the detection probe 3 is driven to rotate around the piston rod 1.
When in use, the circumferential movement and the axial movement of the detection probe 3 can be realized through the cooperation of the electric slide rail 11 and the transmission piece 16.
The above embodiments are merely preferred embodiments of the present utility model, and should not be construed as limiting the present utility model, and the embodiments and features of the embodiments of the present utility model may be arbitrarily combined with each other without collision. The protection scope of the present utility model is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this utility model are also within the scope of the utility model.
Claims (5)
1. A piston rod lets in direct current detection device, its characterized in that: comprises a detection component and a driving component; the detection assembly comprises a direct current excitation source (2) and a detection probe (3), the detection probe (3) is electrically connected with the A/D acquisition card (6) and the processor (7), and the direct current excitation source (2) is electrically connected with the piston rod (1) to be detected to excite the piston rod along the axial direction; the signal output end of the detection probe (3) is electrically connected with the signal input end of the amplifier (4), and the signal output end of the amplifier (4) is electrically connected with the signal input end of the filter (5); the filter (5) is electrically connected with the A/D acquisition card (6) and the processor (7); the detection probe (3) is connected with a driving assembly, the driving assembly comprises a rotating mechanism (8) and a travelling mechanism (9), the rotating mechanism (8) drives the detection probe (3) and the piston rod (1) to do circumferential relative movement, and the axial injury of the piston rod (1) is detected; the advancing mechanism (9) drives the detection probe (3) and the piston rod (1) to do axial relative motion, and circumferential injury of the piston rod (1) is detected.
2. A piston rod energized dc detection device as defined in claim 1 wherein: the detection probe (3) comprises a Hall element, an AMR sensor, a GMR sensor or a TMR sensor.
3. A piston rod energized dc detection device as defined in claim 1 wherein: the direct current excitation source (2) is an adjustable direct current power supply.
4. A piston rod energized dc detection device as defined in claim 1 wherein: the detection probe (3) is arranged over against the surface of the piston rod (1).
5. A piston rod energized dc detection device as defined in claim 1 wherein: the magnetic sensitivity direction of the detection probe (3) is parallel to the radial direction of the piston rod (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223275579.1U CN219799322U (en) | 2022-12-07 | 2022-12-07 | Piston rod direct current detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223275579.1U CN219799322U (en) | 2022-12-07 | 2022-12-07 | Piston rod direct current detection device |
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| Publication Number | Publication Date |
|---|---|
| CN219799322U true CN219799322U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223275579.1U Active CN219799322U (en) | 2022-12-07 | 2022-12-07 | Piston rod direct current detection device |
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| Country | Link |
|---|---|
| CN (1) | CN219799322U (en) |
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2022
- 2022-12-07 CN CN202223275579.1U patent/CN219799322U/en active Active
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