CN115372211A - Metal abrasive particle detection sensor based on double magnetic rings - Google Patents
Metal abrasive particle detection sensor based on double magnetic rings Download PDFInfo
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- CN115372211A CN115372211A CN202211004585.5A CN202211004585A CN115372211A CN 115372211 A CN115372211 A CN 115372211A CN 202211004585 A CN202211004585 A CN 202211004585A CN 115372211 A CN115372211 A CN 115372211A
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- 239000002245 particle Substances 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention belongs to the field of mechanical equipment state monitoring, and particularly relates to a metal abrasive particle detection sensor based on double magnetic rings, which comprises: the permanent magnet assembly comprises a permanent magnet assembly and a housing assembly, wherein the housing assembly comprises a shell, an end cover, a connector lug, a first bolt and a second bolt; a rectangular structure protrudes from the middle of the outer wall of the shell, a small circular groove is formed in the rectangular structure, and the connector lug is fixedly connected with the small circular groove; a circular groove is formed in the right end of the shell, and internal threads are formed in the groove wall of the circular groove; a cylindrical structure protrudes from the left end of the end cover, and external threads corresponding to the internal threads are arranged on the outer wall of the cylindrical structure; the shell and the end cover are rotationally fixed through the internal thread and the external thread; the permanent magnet group is arranged in the shell; according to the invention, the gradient magnetic field with higher strength is generated in a double-magnetic ring arrangement mode, the induced voltage generated by the sensor when the abrasive particles pass is increased, the voltage signal is more obvious, and the range of measuring the abrasive particles is larger and more accurate.
Description
Technical Field
The invention relates to the field of mechanical equipment state monitoring, in particular to a metal abrasive particle detection sensor based on double magnetic rings.
Background
In the long-time operation process of mechanical equipment, problems such as abrasion, corrosion, deformation and the like can occur, and tiny particles generated in the abrasion process can circulate in a mechanical system along with lubricating oil. In normal machine operation, the wear particle size is generally maintained at a level of 10-20 μm, and when abnormal wear occurs, the size of the wear particles increases and the abrasive particle concentration increases significantly. The abrasion information of the mechanical equipment can be obtained by detecting and analyzing the abrasion particles in the lubricating oil, so that the state monitoring and fault diagnosis of the mechanical equipment are achieved.
The principle of one type of permanent magnet-based abrasive particle detection device is as follows: when the metal abrasive particles pass through a magnetic field generated by the permanent magnet, the magnetic field is changed, so that the magnetic flux in the induction coil is changed, and the induction coil generates induction voltage along with the change of the magnetic flux. The volume of the abrasive particles passing through the magnetic field can be reflected according to the magnitude of the induced voltage. But the problem that the detection precision is low exists in current structure, has the risk of destroying lubricated pipeline simultaneously.
The invention makes two improvements and innovations on the traditional metal abrasive particle detection sensor based on the permanent magnet:
1. the magnetic field is strengthened by the two permanent magnets, and the detector with the double-magnetic-ring structure can generate larger induced voltage signals compared with the detector with the single-magnetic-ring structure under the same condition through analog simulation detection, so that the detection precision can be improved, and the abrasive particles with smaller diameters can be detected.
2. The open ring structure is fused into the metal detector, so that the metal abrasive particle detector can be installed without damaging a lubricating oil pipeline. The original pipeline structure is not damaged, and the installation workload is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides a metal abrasive particle detection sensor based on double magnetic rings, which judges the health state of equipment by monitoring metal particles in lubricating oil. In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a metal abrasive particle detection sensor based on double magnetic rings, which comprises: a permanent magnet assembly and a housing assembly,
the permanent magnet assembly comprises a coil 1, a first permanent magnet ring 2 and a second permanent magnet ring 3, wherein the first permanent magnet ring 2 and the second permanent magnet ring 3 are respectively fixed on the right side and the left side of the coil 1;
the housing assembly comprises a housing 4, an end cap 5, a lug 6, a first bolt 7 and a second bolt 8; a rectangular structure protrudes from the middle part of the outer wall of the shell 4, a small circular groove is formed in the rectangular structure, and the connector lug 6 is fixedly connected with the small circular groove; a circular groove is formed in the right end of the shell 4, and internal threads are formed in the wall of the circular groove; a cylindrical structure protrudes from the left end of the end cover 5, and external threads corresponding to the internal threads are arranged on the outer wall of the cylindrical structure; the shell 4 and the end cover 5 are rotationally fixed through internal threads and external threads; the second bolt 8 is fixed at the right end of the end cover 5; the first bolt 7 is fixed at the left end of the shell 4; the permanent magnet assembly is placed inside the housing 4.
Furthermore, a first radial groove is formed in the left side of the rectangular structure of the shell 4, the depth of the first radial groove is the radius of the shell 4, and a first strip-shaped gap is formed by penetrating the middle of the first radial groove leftwards.
Furthermore, the left side of the first radial groove penetrates through the hole to form a first screw hole, and the first bolt 7 is fixed in the first screw hole.
Furthermore, a second radial groove is formed in the right side of the cylindrical structure of the end cover 5, the depth of the second radial groove is equal to the radius of the end cover 5, and a second strip-shaped gap is formed by penetrating the middle of the second radial groove rightwards.
Furthermore, the second radial groove right side is run through and is punched and form the second screw, and second bolt 8 is fixed in the second screw.
Further, the thickness of the first permanent magnet ring 2 and the second permanent magnet ring 3 ranges from 0 mm to 8mm.
The invention has the beneficial effects that:
the invention provides a metal abrasive particle detection sensor structure based on double magnetic rings, which generates a gradient magnetic field with higher strength in a double magnetic ring arrangement mode, increases the induced voltage generated by a sensor when abrasive particles pass through, and has more obvious voltage signals, so that the range of measuring the abrasive particles is larger and more accurate. Meanwhile, the fixing mode of the sensor is improved, most of the original modes need to cut off the pipeline, and then the sensor is connected into the pipeline. The sensor structure after the improvement, when first bolt and second bolt were not screwed up, the internal diameter of end cover and casing was greater than the pipeline diameter, can sheathe in and nimble removal, and the bolt is screwed up the back, and the internal diameter of end cover and casing is dwindled, and outside the direct fixation in mechanical lubricated oil pipe, need not to destroy original pipeline structure.
The invention has simple and compact structure, small volume, less parts, no need of external power supply, reduced difficulty in manufacture and installation, and lower price.
Drawings
FIG. 1 is a cross-sectional view of a dual magnetic ring based metal abrasive particle detection sensor of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a housing construction of the present invention;
FIG. 4 is a view of the end cap of the present invention;
FIG. 5 is a graph showing the change of induced voltage when metal particles made of iron in the example pass through an intermediate passage;
the magnetic field generator comprises a coil 1, a first permanent magnet ring 2, a second permanent magnet ring 3, a shell 4, an end cover 5, a connector lug 6, a first bolt 7 and a second bolt 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a double-magnetic-ring-based metal abrasive particle detection sensor. As shown in fig. 1-3, the sensor includes a permanent magnet assembly and a housing assembly including a housing 4, an end cap 5, a lug 6, a first bolt 7, and a second bolt 8; a rectangular structure protrudes from the middle of the outer wall of the shell 4, a small circular groove is formed in the rectangular structure, and the connector lug 6 is fixedly connected with the small circular groove; a circular groove is formed in the right end of the shell 4, and internal threads are formed in the groove wall of the circular groove; a cylindrical structure protrudes from the left end of the end cover 5, and external threads corresponding to the internal threads are arranged on the outer wall of the cylindrical structure; the shell 4 and the end cover 5 are rotationally fixed through internal threads and external threads; the permanent magnet assembly is placed in the shell 4 and comprises a coil 1, a first permanent magnet ring 2 and a second permanent magnet ring 3, the first permanent magnet ring 2 and the second permanent magnet ring 3 are fixed on the right side and the left side of the coil 1 respectively, and two wire ends of the coil 1 are connected with a connector lug 6 to lead out generated induction voltage.
Specifically, the first permanent magnet ring 2 and the second permanent magnet ring 3 in the permanent magnet assembly are two permanent magnets which are made of the same structural material and are arranged in parallel, and the thickness range is 0-8mm; the coil 1 is positioned in the middle of the first permanent magnet 2 and the second permanent magnet 3.
Specifically, the left end of the circular groove of the housing 4 is provided with a first placement groove for placing one permanent magnet assembly.
Specifically, the right end of the shell 4 and the left end of the end cover 5 are rotationally fixed through internal threads and external threads, and the permanent magnet assembly is wrapped inside to play a role in protecting and fixing the permanent magnet assembly.
Preferably, as shown in fig. 3, the housing 4 is provided with a first radial groove on the left side of the rectangular structure, the depth of the first radial groove is the radius of the housing 4, and a first strip-shaped gap is formed along the middle part of the first radial groove in a left-going penetrating manner; the first radial groove and the first strip-shaped gap form a first open ring structure; a first screw hole is formed in the left side of the first radial groove in a penetrating mode, and a first bolt 7 is fixed in the first screw hole; the degree of compression of the first split ring structure is controlled by the first bolt.
Specifically, the first bar-shaped slit disconnects the first screw hole from the middle, and one end of the first screw hole close to the rectangular structure is partially flattened to facilitate fixing of the first bolt 7. Meanwhile, two semicircular grooves are formed in the middle of the first strip-shaped gap of the shell 4.
Preferably, as shown in fig. 4, the end cover 5 is provided with a second radial groove on the right side of the cylindrical structure, the groove depth of the second radial groove is the radius of the end cover 5, and a second strip-shaped gap is formed by penetrating the middle part of the second radial groove to the right; the second radial groove and the second strip-shaped gap form a second open ring structure; a second screw hole is formed in the right side of the second radial groove in a penetrating mode, and a second bolt 8 is fixed in the second screw hole; the degree of compression of the second split ring structure is controlled by the second bolts, similar to the first split ring structure of the housing 4.
Specifically, the second bar slit disconnects the second screw hole from the center, and the second screw hole has a portion of its one end cut flat to facilitate fixing of the second bolt 8. Meanwhile, two semicircular grooves are formed in the middle of the second strip-shaped gap of the end cover.
In one embodiment, the first permanent magnet ring 2 and the second permanent magnet ring 3 are made of neodymium iron boron, and the coil 1 is a copper core enameled wire wound by 400 turns. Because casing 4 and end cover 5 are last all to be equipped with radial groove and bar gap, radial groove and bar gap have partly to communicate, form the split ring structure, this kind of structure easily produces deformation, adopt first bolt 7 and second bolt 8 to connect two split ring structures respectively, when first bolt 7 and second bolt 8 screwed, casing 4 and end cover 5 produce deformation, two split ring structures receive the extrusion, its opening diminishes, produce the fixed action, fix the metal grit sensor based on the permanent magnet on lubricating oil pipeline jointly.
The circle centers of the first permanent magnet ring 2 and the second permanent magnet ring 3 are the same in magnetizing strength but opposite in direction, when metal abrasive particles pass through the sensor, the metal abrasive particles can affect the change of magnetic flux and further affect the change of induced voltage, the magnetizing direction of the permanent magnet determines the direction of a magnetic field, and the change of the induced voltage is related to the number of turns of the permanent magnet and the number of turns of a coil. In order to explain the distribution of a magnetic field inside the sensor and the condition of induced voltage generated in a detection coil when metal abrasive particles flow through the sensor, finite element analysis is carried out on the sensor by using electromagnetic analysis software ANYSIS Maxwell. If a cylindrical iron abrasive particle with the diameter and the height of the bottom circle of 0.3mm uniformly flows through the sensor at a speed of 4m/s, dynamically simulating the induced voltage of the detection coil; as shown in fig. 5, the variation curve of the coil induced voltage with the movement time is established by taking the movement time of the abrasive particles as the abscissa and the induced voltage generated during the movement of the abrasive particles as the ordinate.
As can be seen from fig. 5, the external conditions are the same except for the magnetic rings, when the metal abrasive particles pass through the magnetic field generated by the permanent magnet, the peak value of the induced voltage of the single magnetic ring is about 235 microvolts (uV), and the peak value of the induced voltage of the double magnetic rings is about 410 microvolts (uV), which is 1.7 times that of the single magnetic ring. The higher induced voltage peak value is easier to be identified by the signal acquisition equipment, and the detection accuracy is higher. Generally speaking, the peak value of the induced voltage is in direct proportion to the volume of the abrasive particles and the speed of the abrasive particles passing through a magnetic field, the reverse thrust is realized, and under the condition that the motion speed of the abrasive particles is the same, the double magnetic rings can detect the abrasive particles with smaller diameters than the single magnetic ring, so that the detection range of the equipment is improved.
Therefore, the dual-magnetic ring structure has more excellent detection accuracy and detection range than the single-magnetic ring structure.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "rotated," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a metal grit detection sensor based on two magnetic rings which characterized in that includes: permanent magnet assembly and shell assembly:
the permanent magnet assembly comprises a coil (1), a first permanent magnet ring (2) and a second permanent magnet ring (3), wherein the first permanent magnet ring (2) and the second permanent magnet ring (3) are respectively fixed on the right side and the left side of the coil (1);
the housing assembly comprises a housing (4), an end cap (5), a lug (6), a first bolt (7) and a second bolt (8); a rectangular structure protrudes from the middle of the outer wall of the shell (4), a small circular groove is formed in the rectangular structure, and the connector lug (6) is fixedly connected with the small circular groove; a circular groove is formed in the right end of the shell (4), and internal threads are formed in the groove wall of the circular groove; a cylindrical structure protrudes from the left end of the end cover (5), and external threads corresponding to the internal threads are arranged on the outer wall of the cylindrical structure; the shell (4) and the end cover (5) are rotationally fixed through internal threads and external threads; the second bolt (8) is fixed at the right end of the end cover (5); the first bolt (7) is fixed at the left end of the shell (4); the permanent magnet assembly is placed inside the shell (4).
2. The double magnetic ring based metal abrasive particle detection sensor is characterized in that the shell (4) is provided with a first radial groove at the left side of the rectangular structure, the groove depth of the first radial groove is the radius of the shell (4), and a first strip-shaped gap is formed along the middle of the first radial groove and penetrates leftwards.
3. The metal abrasive particle detection sensor based on the double magnetic rings as claimed in claim 2, wherein a first screw hole is formed on the left side of the first radial slot through a punched hole, and the first bolt (7) is fixed in the first screw hole.
4. The metal abrasive particle detection sensor based on the double magnetic rings is characterized in that the end cover (5) is provided with a second radial groove at the right side of the cylindrical structure, the groove depth of the second radial groove is the radius of the end cover (5), and a second strip-shaped gap is formed along the middle part of the second radial groove and penetrates rightward.
5. The metal abrasive particle detection sensor based on the double magnetic ring as claimed in claim 4, wherein a second screw hole is formed on the right side of the second radial slot through a punched hole, and the second bolt (8) is fixed in the second screw hole.
6. A dual magnet ring based metal abrasive particle detection sensor as claimed in claim 1, characterized in that the thickness of the first permanent magnet ring (2) and the second permanent magnet ring (3) is in the range of 0-8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211004585.5A CN115372211A (en) | 2022-08-22 | 2022-08-22 | Metal abrasive particle detection sensor based on double magnetic rings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211004585.5A CN115372211A (en) | 2022-08-22 | 2022-08-22 | Metal abrasive particle detection sensor based on double magnetic rings |
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| CN115372211A true CN115372211A (en) | 2022-11-22 |
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| CN202211004585.5A Pending CN115372211A (en) | 2022-08-22 | 2022-08-22 | Metal abrasive particle detection sensor based on double magnetic rings |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502242A (en) * | 2014-11-20 | 2015-04-08 | 北京航空航天大学 | On-line abrasive particle monitoring method and monitoring sensor based on bilateral symmetric structure of the radial magnetic field |
| CN207599192U (en) * | 2017-10-24 | 2018-07-10 | 江苏飞达不锈钢有限公司 | A kind of steel flange for preventing rotation from coming off |
| KR102142932B1 (en) * | 2019-04-25 | 2020-08-10 | 주식회사 솔지 | A iron abrasive particle concentration diagnostic sensor in lubricating oil |
| CN112881244A (en) * | 2021-01-15 | 2021-06-01 | 重庆邮电大学 | Metal particle detection sensor based on high-frequency high-gradient magnetic field and detection method thereof |
| CN113125314A (en) * | 2021-04-08 | 2021-07-16 | 北京信息科技大学 | High-sensitivity metal wear particle detection sensor wrapped with high-permeability material |
| CN113984600A (en) * | 2021-10-27 | 2022-01-28 | 北京信息科技大学 | High-sensitivity metal wear particle online detection sensor based on magnetostatic iron |
| CN114018767A (en) * | 2021-11-05 | 2022-02-08 | 北京理工大学 | Abrasive particle sensor with magnetic ring structure for improving sensitivity |
| CN114878422A (en) * | 2022-06-20 | 2022-08-09 | 重庆邮电大学 | Metal abrasive particle detection sensor based on multi-channel permanent magnet and detection method thereof |
| CN116297053A (en) * | 2023-04-28 | 2023-06-23 | 重庆邮电大学 | Composite magnetic field sensor structure for detecting lubricating oil abrasive particles, manufacturing method and using method thereof |
-
2022
- 2022-08-22 CN CN202211004585.5A patent/CN115372211A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502242A (en) * | 2014-11-20 | 2015-04-08 | 北京航空航天大学 | On-line abrasive particle monitoring method and monitoring sensor based on bilateral symmetric structure of the radial magnetic field |
| CN207599192U (en) * | 2017-10-24 | 2018-07-10 | 江苏飞达不锈钢有限公司 | A kind of steel flange for preventing rotation from coming off |
| KR102142932B1 (en) * | 2019-04-25 | 2020-08-10 | 주식회사 솔지 | A iron abrasive particle concentration diagnostic sensor in lubricating oil |
| CN112881244A (en) * | 2021-01-15 | 2021-06-01 | 重庆邮电大学 | Metal particle detection sensor based on high-frequency high-gradient magnetic field and detection method thereof |
| CN113125314A (en) * | 2021-04-08 | 2021-07-16 | 北京信息科技大学 | High-sensitivity metal wear particle detection sensor wrapped with high-permeability material |
| CN113984600A (en) * | 2021-10-27 | 2022-01-28 | 北京信息科技大学 | High-sensitivity metal wear particle online detection sensor based on magnetostatic iron |
| CN114018767A (en) * | 2021-11-05 | 2022-02-08 | 北京理工大学 | Abrasive particle sensor with magnetic ring structure for improving sensitivity |
| CN114878422A (en) * | 2022-06-20 | 2022-08-09 | 重庆邮电大学 | Metal abrasive particle detection sensor based on multi-channel permanent magnet and detection method thereof |
| CN116297053A (en) * | 2023-04-28 | 2023-06-23 | 重庆邮电大学 | Composite magnetic field sensor structure for detecting lubricating oil abrasive particles, manufacturing method and using method thereof |
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