CN114370971A - Eddy current ring leakage detection device for electric eddy current dynamometer - Google Patents
Eddy current ring leakage detection device for electric eddy current dynamometer Download PDFInfo
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- CN114370971A CN114370971A CN202111652722.1A CN202111652722A CN114370971A CN 114370971 A CN114370971 A CN 114370971A CN 202111652722 A CN202111652722 A CN 202111652722A CN 114370971 A CN114370971 A CN 114370971A
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- 238000001514 detection method Methods 0.000 title claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000003825 pressing Methods 0.000 claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 239000010865 sewage Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides an eddy current ring leakage detection device for an electric eddy current dynamometer, which comprises: the device comprises a machine body frame, a telescopic cylinder, a detection chamber and a pressing plate device. The top of the machine body frame is provided with a supporting flat plate, and the bottom of the machine body frame is provided with a mounting platform. The detection chamber is arranged on the mounting platform and provided with a plurality of vortex ring detection grooves. The telescopic cylinder is arranged on the supporting flat plate, and a transmission shaft of the telescopic cylinder is in transmission connection with the pressing plate device. The pressing plate device is provided with a plurality of solid plugs and a plurality of hollow plugs, and when the telescopic cylinder is in telescopic operation, the pressing plate device is driven to move up and down so as to plug and/or conduct the water outlet hole of the vortex ring in the detection chamber. The invention can improve the work efficiency of the vortex ring leakage detection and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of eddy current ring testing, in particular to an eddy current ring leakage testing device for an electric eddy current dynamometer.
Background
The eddy current dynamometer has the advantages of low inertia, high precision, high stability, simple structure, suitability for operation control automation and the like, is mainly used for testing the rotating speed, torque and power of rotary power machines such as an engine and the like and performance tests, and can also be used for performance tests, durability tests and type tests of parts such as other prime movers, motors, rotating systems, oil pump nozzle speed regulators and the like. The method is widely applied to the industries of production, scientific research, teaching, maintenance and the like. As shown in fig. 1, the eddy current dynamometer mainly comprises an eddy current ring, an excitation coil, an end cover, a rotor, a signal acquisition system, an inlet/outlet water pipeline and a water pipeline. The middle of the vortex ring body is provided with a water channel which can be used for radiating heat of the excitation coil through cooling water at about 20 ℃. An electric vortex dynamometer has 4 vortex rings, and the inner wall of vortex ring only has 1mm thickness, if the inner wall fracture infiltration, can influence experimental data measurement accuracy, leads to the experimental result to become invalid, misleading product research and development. Meanwhile, the cracking and water seepage of the inner wall of the vortex ring cannot be observed and found in time at the periphery, and the more the water seepage quantity is, the more serious problems such as the burning of the excitation coil and the damage of the dynamometer are caused, and the economic loss is caused. In the actual use and maintenance process, more than 85% of failures of the electric eddy current dynamometer are caused by cracking and water seepage of an eddy current ring. Before the assembly and maintenance of the whole dynamometer, the inner wall of the vortex ring needs to be carefully checked repeatedly, and the assembly is carried out after the vortex ring is judged to be intact. Because the crack of the inner wall of the vortex ring is very fine, the crack is not easy to distinguish. Particularly, rust stains are arranged on the surface of the inner wall of the eddy current ring which is maintained and reused for the second time, fine cracks are almost invisible to naked eyes after rust removal, the judgment work efficiency is low, and the accuracy is not high. For the vortex ring which cannot be accurately judged, the vortex ring can only be treated as a waste part, and waste is caused. Therefore, how to realize the leakage detection of the vortex ring, the assembly and maintenance requirements of the dynamometer are met, the working efficiency is improved, the production experiment cost is reduced, and the method has important significance.
Disclosure of Invention
The invention provides an eddy current ring leakage detection device for an eddy current dynamometer, which solves the problems of inconvenience and high cost of the existing eddy current ring leakage point detection, can improve the work efficiency of eddy current ring leakage detection, and reduces the production cost.
In order to achieve the above purpose, the invention provides the following technical scheme:
an eddy current ring leakage detection device for an eddy current dynamometer, comprising: the device comprises a machine body frame, a telescopic cylinder, a detection chamber and a pressing plate device;
the top of the machine body frame is provided with a supporting flat plate, and the bottom of the machine body frame is provided with a mounting platform;
the detection chamber is arranged on the mounting platform and is provided with a plurality of vortex ring detection grooves;
the telescopic cylinder is arranged on the support flat plate, and a transmission shaft of the telescopic cylinder is in transmission connection with the pressing plate device;
the pressing plate device is provided with a plurality of solid plugs and a plurality of hollow plugs, and when the telescopic cylinder is in telescopic operation, the pressing plate device is driven to move up and down so as to plug and/or conduct the water outlet hole of the vortex ring in the detection chamber.
Preferably, the body frame includes: the device comprises a first upright column, a second upright column and a cross beam;
the first upright post and the second upright post are both vertically arranged on the mounting platform and are positioned at the same side of the mounting platform;
the supporting flat plate is parallel to the mounting platform and is vertically arranged at the tops of the first upright post and the second upright post, and a cylinder fixing mounting hole is formed in the supporting flat plate;
the beam is vertically arranged between the first upright post and the second upright post, and a plurality of mounting holes are formed in the beam.
Preferably, the mounting platform is provided with a boss for placing the detection chamber, a sewage discharge groove is arranged around the boss, the sewage discharge groove is connected with a sewage discharge pipe, and the sewage discharge pipe is provided with a sewage discharge valve;
the bottom of the mounting platform is provided with the supporting legs with adjustable height.
Preferably, the detection chamber is provided with a plurality of vortex ring detection grooves which are spaced from each other, the bottom of each vortex ring detection groove is provided with a positioning pin, and a conical plug is sleeved on each positioning pin to position and plug a water inlet hole of a vortex ring in each vortex ring detection groove.
Preferably, a sewage draining hole is formed in the bottom of the vortex ring detection groove, and an observation window is formed in the side wall of the vortex ring detection groove.
Preferably, the detection chamber is of a groove structure, and the observation window is of an arc-shaped opening structure.
Preferably, the platen device includes: a fixed plate and a connecting hose;
the solid plugs and the hollow plugs are arranged at the bottom side of the fixed plate, the connecting hose is arranged at the top surface of the fixed plate, and the fixed plate is in transmission connection with the transmission shaft of the telescopic cylinder;
the hollow plug is communicated with one end of the connecting hose, and the other end of the connecting hose is communicated with an external medium source;
and a control valve is arranged between the hollow plug and the connecting hose to control the filling of the hollow plug by the flowing medium in the connecting hose.
Preferably, the hollow plug includes: a hollow connecting pipe and a soft plugging sleeve;
the soft plug sleeve is provided with a through hole, one end of the hollow connecting pipe is inserted into the through hole, and the other end of the hollow connecting pipe is communicated with the connecting hose.
Preferably, the method further comprises the following steps: a booster pump;
the booster pump is arranged on the connecting hose, is fixed on the machine body frame and is used for boosting the medium in the connecting hose.
Preferably, the method further comprises the following steps: a control cabinet;
the control cabinet is arranged on the machine body frame and is respectively in signal connection with the telescopic cylinder and the booster pump and used for controlling the telescopic motion of the telescopic cylinder and controlling the operation or stop of the booster pump.
The invention provides an eddy current ring leakage detection device for an eddy current dynamometer, wherein a detection chamber with an eddy current ring detection groove is arranged on a body frame, and a pressure plate device is controlled by a telescopic cylinder to plug and/or conduct a water outlet hole of an eddy current ring to be detected so as to perform leakage detection. The problem of current vortex ring leak source detect exist not convenient and with high costs is solved, the work efficiency that can improve the vortex ring and leak hunting reduces manufacturing cost.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of a conventional eddy current dynamometer.
FIG. 2 is a schematic view of an eddy current ring leakage detecting device for an eddy current dynamometer provided by the present invention.
Fig. 3 is a schematic structural diagram of the machine body frame provided by the invention.
FIG. 4 is a schematic view of a detection chamber provided by the present invention.
FIG. 5 is a schematic view of a platen apparatus provided by the present invention.
Fig. 6 is a schematic structural diagram of the hollow plug provided by the invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problems of inconvenience and high cost of the current eddy current ring leakage point test of the eddy current dynamometer, the invention provides the eddy current ring leakage detection device for the eddy current dynamometer, which solves the problems of inconvenience and high cost of the existing eddy current ring leakage point test, can improve the work efficiency of eddy current ring leakage detection and reduce the production cost.
As shown in fig. 2 to 5, an eddy current ring leakage detecting apparatus for an eddy current dynamometer includes: the device comprises a machine body frame 2, a telescopic cylinder 1, a detection chamber 3 and a pressing plate device 4. The top of the machine body frame 2 is provided with a supporting flat plate 24, and the bottom of the machine body frame 2 is provided with a mounting platform 23. The detection chamber 3 is arranged on the mounting platform 23, and the detection chamber 3 is provided with a plurality of vortex ring detection grooves 31. The telescopic cylinder 1 is arranged on the supporting flat plate 24, and a transmission shaft of the telescopic cylinder 1 is in transmission connection with the pressing plate device 4. The pressing plate device 4 is provided with a plurality of solid plugs 43 and a plurality of hollow plugs 44, and when the telescopic cylinder is in telescopic operation, the pressing plate device is driven to move up and down so as to plug and/or conduct the water outlet holes of the vortex ring arranged in the detection chamber.
Specifically, the detection chamber of the vortex ring is fixed on a machine body frame mounting platform through bolts, the single-cylinder telescopic cylinder is fixed on a mounting hole of a supporting flat plate above the machine body frame through bolts, and the pressing plate device is fixed on a telescopic rod of the single-cylinder telescopic cylinder through bolts. During detection, the vortex ring to be detected is placed in a vortex ring detection groove in a detection chamber, the telescopic cylinder is controlled to push the pressing plate device to move downwards, the solid plug and the hollow plug are used for plugging or conducting a water outlet in the vortex ring, and the hollow plug can be communicated with an external air source or a water source so as to inject air or inject water into the vortex ring for leakage detection. The device can solve the problem that the existing vortex ring leakage point detection is inconvenient and high in cost, can improve the working efficiency of vortex ring leakage detection, and reduces the production cost.
As shown in fig. 3, the body frame includes: a first upright 21, a second upright 22 and a cross-beam 25. The first upright post 21 and the second upright post 22 are both vertically arranged on the mounting platform 23 and are on the same side of the mounting platform 23. The supporting flat plate 24 is parallel to the mounting platform 23 and is vertically arranged at the tops of the first upright post 21 and the second upright post 22, and a cylinder fixing mounting hole is formed in the supporting flat plate 24. The cross beam 25 is vertically arranged between the first upright post 21 and the second upright post 22, and a plurality of mounting holes are arranged on the cross beam 25.
Further, the mounting platform 23 is provided with a boss 231, the boss 231 is used for placing the detection chamber, a sewage discharge groove 232 is arranged around the boss 231, the sewage discharge groove is connected with a sewage discharge pipe, and the sewage discharge pipe is provided with a sewage discharge valve 233; the bottom of the mounting platform 23 is provided with the supporting feet 26 with adjustable height.
As shown in fig. 4, the detection chamber 3 is provided with a plurality of vortex ring detection grooves 31 spaced from each other, the bottom of each vortex ring detection groove 31 is provided with a positioning pin 32, and the positioning pin is sleeved with a conical plug to position and plug a water inlet hole of a vortex ring in the vortex ring detection groove.
Further, a sewage draining hole 33 is arranged at the bottom of the vortex ring detection groove 31, and an observation window 34 is arranged on the side wall of the vortex ring detection groove 31.
Further, the detection chamber is of a groove structure, and the observation window is of an arc-shaped opening structure.
In one embodiment, the detection chamber may comprise: 4 vortex ring detection grooves, positioning pins and conical plugs of 4 vortex ring water inlet holes made of soft rubber, 8 sewage discharge holes and a vortex ring leak source observation window. The detection chamber is a groove structure with the length of 37.5cm, the width of 5.52cm and the depth of 23cm, and the size is designed according to the material object size of the vortex ring and is fixed. A positioning pin of a water inlet hole of the vortex ring is arranged in the middle of the bottom of the vortex ring detection groove, the positioning pin is of a cylindrical structure with the diameter of 1.5cm and the height of 1.5cm, and the positioning pin is made of steel materials. The conical plug of the vortex ring water inlet hole is made of soft rubber, is in a conical structure with the lower bottom diameter of 3cm, the upper bottom diameter of 1.5cm and the height of 3cm, and is made of rubber materials. The positioning hole is inserted on the positioning pin, and the positioning hole and the positioning pin are in interference fit. The cone-shaped plug made of soft rubber belongs to a consumable and can be replaced. An observation window with the diameter of 22cm is arranged on the side wall of the vortex ring detection groove and used for monitoring the condition of a leakage point during work.
As shown in fig. 5, the platen device 4 includes: a fixed plate 41 and a connection hose 42. The solid plugs 43 and the hollow plugs 44 are arranged at the bottom side of the fixed plate 41, the connecting hose 42 is arranged at the top surface of the fixed plate 41, and the fixed plate 41 is in transmission connection with the transmission shaft of the telescopic cylinder 1. The hollow plug 44 is communicated with one end of the connection hose 42, and the other end of the connection hose 42 is communicated with an external medium source. A control valve is arranged between the hollow plug 44 and the connecting hose 42 to control the filling of the hollow plug by the flowing medium in the connecting hose.
As shown in fig. 6, the hollow plug 44 includes: a hollow connecting pipe 441 and a soft blocking sleeve 442; the soft blocking sleeve 442 is provided with a through hole, one end of the hollow connecting pipe 441 is inserted into the through hole, and the other end of the hollow connecting pipe 441 is communicated with the connecting hose.
In an embodiment, the platen device may include: 1 rubber connecting hose, 4 solid plugs made of soft rubber, 4 hollow plugs made of soft rubber and a square fixing plate. The rubber connecting hose is used for passing through a detection medium (water or gas), the square fixing plate is a steel plate with the length of 30cm, the width of 20cm and the thickness of 2cm, 8 fixing mounting holes (the diameter of 2.5cm) for fixing the plugs and 1 fixing mounting hole for connecting with the telescopic rod of the air cylinder are formed in the square fixing plate. The hollow connecting pipe in the hollow plug can be a hollow steel pipe, the solid plug can be composed of a solid rod and a soft plug sleeve, and the solid rod is made of solid steel materials. In practical application, the hollow plug and the solid plug may have similar structures, and the difference is only the difference between the hollow connecting pipe and the solid rod. As shown in figure 6, the soft plugging sleeve can be composed of a conical part and a cylindrical part, wherein the diameter of the lower bottom of the conical part is 3.5cm, the diameter of the upper bottom of the conical part is 2.5cm, and the height of the conical part is 1 cm. The cylinder portion may be 2.5cm in diameter and 1.5cm high.
The device also includes: booster pumps (not shown in the figure); the booster pump is arranged on the connecting hose, is fixed on the machine body frame and is used for boosting the medium in the connecting hose.
As shown in fig. 1, the apparatus further comprises: a control cabinet 5; the control cabinet 5 is arranged on the machine body frame 2, and the control cabinet 5 is respectively in signal connection with the telescopic cylinder 1 and the booster pump and is used for controlling the telescopic motion of the telescopic cylinder and controlling the running or stopping of the booster pump.
In one embodiment, the test procedure for the vortex ring leakage detection device is as follows:
the first step is as follows: firstly, a vortex ring leakage point testing device of an eddy current dynamometer is placed on a working occasion.
The second step is that: the level is adjusted by adjusting 4 adjustable horizontal supporting legs at the bottom of the mounting platform.
The third step: and determining that the requirement of a detection medium is met in a working occasion, the water pressure of the detection medium is more than or equal to 0.2MPa, the air pressure is more than or equal to 0.2MPa, and the power supply is single-phase AC220V (converted into DC24V through an electric control box).
The fourth step: the vortex ring to be detected is placed in a vortex ring detection groove in a detection chamber, one vortex ring can be placed, at most 4 vortex rings to be detected can be placed at the same time, and the water inlet hole at the lower end of the vortex ring is aligned with the positioning pin and the conical plug at the bottom of the vortex ring detection groove to be compressed.
The fifth step: the detection medium is connected and can be connected with the medium in the hose for pressurization.
And a sixth step: and pressing a detection button on a panel of the electrical control box, enabling the electromagnetic valve to work by electrifying, pushing the pressing plate device by the telescopic rod of the air cylinder to press down, checking and confirming that the two water outlet holes at the upper end of the vortex ring are tightly pressed and sealed by the hollow plug or the solid plug of the vortex ring detection pressing plate device.
The seventh step: and opening a control valve (which can be controlled by a manual valve or a DC24V electromagnetic valve) on the hollow plug of the pressure plate device, allowing the detection medium to flow into the vortex ring and form pressure, and detecting the leakage test time to be more than or equal to 3 min.
Eighth step: whether the inner wall of the vortex ring has leakage or not is observed through an observation window of the detection chamber, and whether the vortex ring is good or not is judged in sequence. The leaked detection medium is discharged out of the detection chamber through the drain hole.
The ninth step: and when a stop button on the panel of the electrical control box is pressed, the air cylinder telescopic rod drives the pressing plate device to withdraw, and the vortex rings are taken out and stored in a classified manner.
The tenth step: and finishing the detection work.
The invention provides an eddy current ring leakage detection device for an eddy current dynamometer, wherein a detection chamber with an eddy current ring detection groove is arranged on a machine body frame, and a telescopic cylinder controls a pressing plate device to plug and/or conduct a water outlet hole of an eddy current ring to be detected so as to perform leakage detection. The problem of current vortex ring leak source detect exist not convenient and with high costs is solved, the work efficiency that can improve the vortex ring and leak hunting reduces manufacturing cost.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (10)
1. An eddy current ring leakage detection device for an eddy current dynamometer, comprising: the device comprises a machine body frame, a telescopic cylinder, a detection chamber and a pressing plate device;
the top of the machine body frame is provided with a supporting flat plate, and the bottom of the machine body frame is provided with a mounting platform;
the detection chamber is arranged on the mounting platform and is provided with a plurality of vortex ring detection grooves;
the telescopic cylinder is arranged on the support flat plate, and a transmission shaft of the telescopic cylinder is in transmission connection with the pressing plate device;
the pressing plate device is provided with a plurality of solid plugs and a plurality of hollow plugs, and when the telescopic cylinder is in telescopic operation, the pressing plate device is driven to move up and down so as to plug and/or conduct the water outlet hole of the vortex ring in the detection chamber.
2. The eddy current ring leakage detection device for an eddy current dynamometer according to claim 1, wherein the body frame includes: the device comprises a first upright column, a second upright column and a cross beam;
the first upright post and the second upright post are both vertically arranged on the mounting platform and are positioned at the same side of the mounting platform;
the supporting flat plate is parallel to the mounting platform and is vertically arranged at the tops of the first upright post and the second upright post, and a cylinder fixing mounting hole is formed in the supporting flat plate;
the beam is vertically arranged between the first upright post and the second upright post, and a plurality of mounting holes are formed in the beam.
3. The eddy current ring leakage detection device for the eddy current dynamometer as claimed in claim 2, wherein the mounting platform is provided with a boss for placing the detection chamber, a sewage discharge groove is arranged around the boss, the sewage discharge groove is connected with a sewage discharge pipe, and a sewage discharge valve is arranged on the sewage discharge pipe;
the bottom of the mounting platform is provided with the supporting legs with adjustable height.
4. The eddy current ring leakage detection device for the electric eddy current dynamometer as claimed in claim 3, wherein the detection chamber is provided with a plurality of eddy current ring detection slots spaced from each other, a positioning pin is arranged at the bottom of each eddy current ring detection slot, and a conical plug is sleeved on each positioning pin to position and plug a water inlet hole of an eddy current ring placed in each eddy current ring detection slot.
5. The eddy current ring leakage detecting device for the electric eddy current dynamometer according to claim 4, wherein a blowdown hole is formed at the bottom of the eddy current ring detection slot, and an observation window is formed in a side wall of the eddy current ring detection slot.
6. The eddy current ring leakage detection device for the electric eddy current dynamometer of claim 5, wherein the detection chamber is of a groove structure, and the observation window is of an arc-shaped notch structure.
7. The eddy current ring leakage detection device for an eddy current dynamometer of claim 6, wherein the platen device includes: a fixed plate and a connecting hose;
the solid plugs and the hollow plugs are arranged at the bottom side of the fixed plate, the connecting hose is arranged at the top surface of the fixed plate, and the fixed plate is in transmission connection with the transmission shaft of the telescopic cylinder;
the hollow plug is communicated with one end of the connecting hose, and the other end of the connecting hose is communicated with an external medium source;
and a control valve is arranged between the hollow plug and the connecting hose to control the filling of the hollow plug by the flowing medium in the connecting hose.
8. The eddy current ring leakage detection device for an eddy current dynamometer of claim 7, wherein the hollow plug includes: a hollow connecting pipe and a soft plugging sleeve;
the soft plug sleeve is provided with a through hole, one end of the hollow connecting pipe is inserted into the through hole, and the other end of the hollow connecting pipe is communicated with the connecting hose.
9. The eddy current ring leakage detection device for an eddy current dynamometer according to claim 8, further comprising: a booster pump;
the booster pump is arranged on the connecting hose, is fixed on the machine body frame and is used for boosting the medium in the connecting hose.
10. The eddy current ring leakage detection device for an eddy current dynamometer according to claim 9, further comprising: a control cabinet;
the control cabinet is arranged on the machine body frame and is respectively in signal connection with the telescopic cylinder and the booster pump and used for controlling the telescopic motion of the telescopic cylinder and controlling the operation or stop of the booster pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111652722.1A CN114370971A (en) | 2021-12-30 | 2021-12-30 | Eddy current ring leakage detection device for electric eddy current dynamometer |
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| CN202111652722.1A CN114370971A (en) | 2021-12-30 | 2021-12-30 | Eddy current ring leakage detection device for electric eddy current dynamometer |
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|---|---|---|---|---|
| CN115541139A (en) * | 2022-12-01 | 2022-12-30 | 湖南湘仪动力测试仪器有限公司 | Eddy current ring leakage detection device for electric eddy current dynamometer |
| CN115541139B (en) * | 2022-12-01 | 2023-03-07 | 湖南湘仪动力测试仪器有限公司 | Eddy current ring leakage detection device for electric eddy current dynamometer |
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Application publication date: 20220419 |