CN108489857B - Pipeline protection layer density monitoring method - Google Patents
Pipeline protection layer density monitoring method Download PDFInfo
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- CN108489857B CN108489857B CN201810205630.0A CN201810205630A CN108489857B CN 108489857 B CN108489857 B CN 108489857B CN 201810205630 A CN201810205630 A CN 201810205630A CN 108489857 B CN108489857 B CN 108489857B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011241 protective layer Substances 0.000 claims abstract description 56
- 239000010410 layer Substances 0.000 claims abstract description 50
- 239000000696 magnetic material Substances 0.000 claims abstract description 36
- 238000012806 monitoring device Methods 0.000 claims description 10
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract description 98
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification 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
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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Abstract
The invention belongs to the field of density monitoring methods, and particularly relates to a pipeline protective layer density monitoring method. According to the density monitoring method, a first capacitance sensor is formed by a first electrode plate 11 and a second electrode plate 12 which are respectively and fixedly arranged on a first annular magnet 4 and a first frame 9 which are arranged outside a pipeline protective layer 2 added with a magnetic material, and a capacitance value displayed by a second capacitance sensor is formed by a third electrode plate 13 and a fourth electrode plate 14 which are respectively and fixedly arranged on a second annular magnet 5 and a second frame 10, so that the difference of magnetic force actions generated by a magnetic ball 3 arranged inside a pipeline 1 made of a non-magnetic material on the first annular magnet 4 and the second annular magnet 5 is judged, and the position of a low-density area of the pipeline protective layer is accurately monitored under the condition that the pipeline and the protective layer are not damaged; the method for monitoring the density of the pipeline protection layer is simple, convenient and flexible, improves the maintenance efficiency of the pipeline and reduces the maintenance cost.
Description
Technical Field
The invention belongs to the field of density monitoring methods, and particularly relates to a pipeline protective layer density monitoring method.
Background
A pipeline is a device for transporting a gas, liquid or fluid with solid particles, connected by pipes, pipe couplings, valves, etc. Generally, a fluid is pressurized by a blower, a compressor, a pump, a boiler, etc., and then flows from a high pressure portion to a low pressure portion of a pipe, or is transported by the pressure or gravity of the fluid itself. The use of pipelines is very widespread, mainly in water supply, drainage, heating, gas supply, long-distance oil and gas delivery, agricultural irrigation, hydraulic engineering and various industrial installations.
In some special environments, in order to preserve heat, resist corrosion and the like, a protective layer needs to be arranged on the outer wall of the pipeline, and the uniformity of the protective layer has direct influence on the service life of the pipeline. If the protective layer is not uniform, for example, the heat insulation layer of the heat supply pipeline is not uniform, water vapor, oxygen and the like in the external environment are more easily gathered in the low density area, so that the low density area is taken as a breakthrough, the pipe wall is corroded, the maintenance cost of the pipe wall is increased, and the service life of the pipeline is seriously influenced.
It can be seen that monitoring of the density of the pipe protective layer is essential, however, no protective layer density monitoring device has been found to be directly applied to the pipe.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for monitoring the density of a pipeline protection layer.
The technical scheme of the invention is as follows:
a pipeline protection layer density monitoring device comprises a pipeline made of non-magnetic materials, a pipeline protection layer, a magnetic ball, a first annular magnet, a second annular magnet, a first frame and a second frame, wherein the pipeline protection layer is arranged around the periphery of the pipeline and is added with the magnetic materials;
the magnetic ball is fixedly placed in a magnetic ball frame made of a non-magnetic material, an upper support made of the non-magnetic material and a lower support made of the non-magnetic material are arranged outside the magnetic ball frame, the magnetic ball frame and the magnetic ball therein are fixed in the pipeline through the upper support and the lower support which are perpendicular to the pipeline, and the opposite magnetic poles of the ceramic balls are arranged along the direction of the pipeline;
a first frame and a second frame are fixedly arranged on two sides of the magnetic ball frame at equal intervals respectively, a first annular magnet is arranged between the magnetic ball frame and the first frame, a second annular magnet is arranged between the magnetic ball frame and the second frame, and opposite magnetic poles of the first annular magnet and the second annular magnet are oppositely arranged; the first annular magnet and the second annular magnet are identical in shape and volume and can move positions along the pipeline;
the first annular magnet and the first frame are respectively and fixedly provided with a first electrode plate and a second electrode plate at the relative positions, the first electrode plate and the second electrode plate form a first capacitance sensor, the second annular magnet and the second frame are respectively and fixedly provided with a third electrode plate and a fourth electrode plate at the relative positions, and the third electrode plate and the fourth electrode plate form a second capacitance sensor.
Furthermore, the magnetic ball frame is a hollow ball body.
Furthermore, the upper bracket and the lower bracket are arranged at two opposite positions on the same axial lead of the magnetic ball frame.
A pipeline protection layer density monitoring method realized on the pipeline protection layer density monitoring device comprises the following steps:
step a, arranging a first annular magnet and a second annular magnet on a pipeline protective layer, wherein the distance from the initial position of the first annular magnet to a magnetic ball is required to be equal to the distance from the initial position of the second annular magnet to the magnetic ball;
step b, monitoring the capacitance value C1 of the first capacitive sensor and the capacitance value C2 of the second capacitive sensor, if:
c1 is C2, the magnetic ball will generate the same attraction or repulsion to the first ring magnet and the second ring magnet, the density of the pipe protective layer added with the magnetic material is uniform; c1 ≠ C2, the magnetic balls generate attraction force or repulsion force with different magnitude to the first ring magnet and the second ring magnet, and the density of the pipe protection layer added with the magnetic material is not uniform.
Further, if the magnetic balls and the first and second ring magnets are opposite to each other in terms of like magnetic poles and C1 ≠ C2, it further includes the following steps:
if C1 is greater than C2, a low density region exists from the magnetic ball to the second ring magnet portion in the protective layer of the pipeline;
if C1 is less than C2, a low density region exists from the magnetic balls to the first ring magnet portion in the pipe protective layer.
Further, if the magnetic ball is opposite to the first annular magnet and the second annular magnet in terms of unlike magnetic poles and C1 ≠ C2, the method further comprises the following steps:
if C1 is greater than C2, a low density region exists from the magnetic balls to the first ring magnet portion in the pipe protective layer;
if C1 is less than C2, a low density region exists from the portion of the pipe shield from the magnetic sphere to the second ring magnet.
The invention has the beneficial effects that:
the pipeline protective layer density monitoring method provided by the invention can accurately monitor the protective layer density difference at any position of the pipeline without damaging the pipeline and the protective layer, and further judge the specific position of a low-density area; the monitoring device is flexible to disassemble and assemble, the using method is simple and convenient, and maintainers can timely maintain the low-density area of the pipeline protective layer through the monitoring result, so that the service life of the pipeline is prolonged. Because the density monitoring result of the invention is accurate, maintenance personnel only need to maintain the low-density area without replacing the whole pipeline, thereby not only improving the pipeline maintenance efficiency, but also reducing the maintenance cost.
Drawings
FIG. 1 is a schematic structural diagram of a device for monitoring density of a protective layer of a pipeline according to an embodiment;
FIG. 2 is a schematic structural diagram of a device for monitoring the density of a protective layer of a pipeline according to a third embodiment;
FIG. 3 is a schematic structural diagram of a device for monitoring the density of a protective layer of a pipeline according to an embodiment;
FIG. 4 is a left side view of an embodiment of a device for monitoring the density of a protective layer of a pipeline;
FIG. 5 is a schematic structural diagram of a device for monitoring the density of a protective layer of a pipeline according to an embodiment of the present invention;
FIG. 6 is a left side view of the pipe protective layer density monitoring apparatus according to the fifth embodiment;
FIG. 7 is a left side view of the pipe protective layer density monitoring apparatus according to the fifth embodiment in operation;
in the figure, 1, a pipeline; 2. a pipe protective layer; 3. a magnetic ball; 4. a first ring magnet; 5. a second annular magnet; 6. a magnetic ball frame; 7. an upper bracket; 8. a lower bracket; 9. a first frame; 10. a second frame; 11. a first electrode plate; 12. a second electrode plate; 13. a third electrode plate; 14. a fourth electrode plate; 15. a fifth electrode plate; 16. a sixth electrode plate; 17. a seventh electrode plate; 18. an eighth electrode plate; 19. a first rotating shaft; 20. a second rotating shaft; 21. a first fixing member; 22. a second fixing member; 23. a ninth electrode plate; 24. a tenth electrode plate; 25. an eleventh electrode plate; 26. a twelfth electrode plate; 27. a first spring screw; 28. a second spring screw.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Detailed description of the invention
A pipeline protection layer density monitoring device is shown in figure 1 and comprises a pipeline 1 made of a non-magnetic material, a pipeline protection layer 2 which surrounds the periphery of the pipeline 1 and is added with a magnetic material, a magnetic ball 3 arranged inside the pipeline 1, and a first annular magnet 4, a second annular magnet 5, a first frame 9 and a second frame 10 which surround the outside of the pipeline protection layer 2;
the magnetic ball 3 is fixedly arranged in a magnetic ball frame 6 made of a non-magnetic material, an upper bracket 7 made of a non-magnetic material and a lower bracket 8 made of a non-magnetic material are arranged outside the magnetic ball frame 6, the magnetic ball frame 6 and the magnetic ball 3 in the magnetic ball frame are fixed in the pipeline 1 through the upper bracket 7 and the lower bracket 8 which are arranged perpendicular to the pipeline 1, and the opposite magnetic poles of the ceramic balls 3 are arranged along the direction of the pipeline 1;
a first frame 9 and a second frame 10 are fixedly arranged on two sides of the magnetic ball frame 6 at equal intervals respectively, a first annular magnet 4 is arranged between the magnetic ball frame 6 and the first frame 9, a second annular magnet 5 is arranged between the magnetic ball frame 6 and the second frame 10, and the opposite magnetic poles of the first annular magnet 4 and the second annular magnet 5 are oppositely arranged; the first annular magnet 4 and the second annular magnet 5 are the same in shape and volume and can move in position along the pipeline 1;
a first electrode plate 11 and a second electrode plate 12 are respectively and fixedly arranged at the relative positions of the first ring magnet 4 and the first frame 9, the first electrode plate 11 and the second electrode plate 12 form a first capacitance sensor, a third electrode plate 13 and a fourth electrode plate 14 are respectively and fixedly arranged at the relative positions of the second ring magnet 5 and the second frame 10, and the third electrode plate 13 and the fourth electrode plate 14 form a second capacitance sensor.
The method for monitoring the density of the pipeline protection layer, which is implemented on the device for monitoring the density of the pipeline protection layer provided by the embodiment, comprises the following steps:
step a, arranging a first annular magnet 4 and a second annular magnet 5 on a pipeline protection layer 2, wherein the distance from the initial position of the first annular magnet 4 to a magnetic ball 3 is required to be equal to the distance from the initial position of the second annular magnet 5 to the magnetic ball 3;
step b, monitoring the capacitance value C1 of the first capacitive sensor and the capacitance value C2 of the second capacitive sensor, if:
c1 is C2, the magnetic balls 3 will generate the same attractive force or repulsive force to the first ring magnet 4 and the second ring magnet 5, and the density of the pipe protection layer 2 added with the magnetic material is uniform; c1 ≠ C2, the magnetic balls 3 generate attraction force or repulsion force with different magnitude to the first ring magnet 4 and the second ring magnet 5, and the density of the pipe protection layer 2 with the magnetic material added is not uniform.
Detailed description of the invention
A pipeline protection layer density monitoring device is shown in figure 1 and comprises a pipeline 1 made of a non-magnetic material, a pipeline protection layer 2 which surrounds the periphery of the pipeline 1 and is added with a magnetic material, a magnetic ball 3 arranged inside the pipeline 1, and a first annular magnet 4, a second annular magnet 5, a first frame 9 and a second frame 10 which surround the outside of the pipeline protection layer 2;
the magnetic ball 3 is fixedly arranged in a magnetic ball frame 6 made of non-magnetic material, the magnetic ball frame 6 is a hollow ball body,
an upper bracket 7 made of a non-magnetic material and a lower bracket 8 made of a non-magnetic material are arranged outside the magnetic ball frame 6, the upper bracket 7 and the lower bracket 8 are arranged at two opposite positions on the same axial lead of the magnetic ball frame 6, the magnetic ball frame 6 and a magnetic ball 3 in the magnetic ball frame are fixed in the pipeline 1 through the upper bracket 7 and the lower bracket 8 which are arranged perpendicular to the pipeline 1, and the opposite magnetic poles of the ceramic balls 3 are arranged along the direction of the pipeline 1;
a first frame 9 and a second frame 10 are fixedly arranged on two sides of the magnetic ball frame 6 at equal intervals respectively, a first annular magnet 4 is arranged between the magnetic ball frame 6 and the first frame 9, a second annular magnet 5 is arranged between the magnetic ball frame 6 and the second frame 10, and the opposite magnetic poles of the first annular magnet 4 and the second annular magnet 5 are oppositely arranged; the first annular magnet 4 and the second annular magnet 5 are the same in shape and volume and can move in position along the pipeline 1;
a first electrode plate 11 and a second electrode plate 12 are respectively and fixedly arranged at the relative positions of the first ring magnet 4 and the first frame 9, the first electrode plate 11 and the second electrode plate 12 form a first capacitance sensor, a third electrode plate 13 and a fourth electrode plate 14 are respectively and fixedly arranged at the relative positions of the second ring magnet 5 and the second frame 10, and the third electrode plate 13 and the fourth electrode plate 14 form a second capacitance sensor.
The method for monitoring the density of the pipeline protection layer, which is implemented on the device for monitoring the density of the pipeline protection layer provided by the embodiment, comprises the following steps:
step a, arranging a first annular magnet 4 and a second annular magnet 5 on a pipeline protection layer 2, wherein the distance from the initial position of the first annular magnet 4 to a magnetic ball 3 is required to be equal to the distance from the initial position of the second annular magnet 5 to the magnetic ball 3;
step b, monitoring the capacitance value C1 of the first capacitive sensor and the capacitance value C2 of the second capacitive sensor, if:
c1 is C2, the magnetic balls 3 will generate the same attractive force or repulsive force to the first ring magnet 4 and the second ring magnet 5, and the density of the pipe protection layer 2 added with the magnetic material is uniform; c1 ≠ C2, the magnetic balls 3 generate attraction force or repulsion force with different magnitude to the first ring magnet 4 and the second ring magnet 5, and the density of the pipe protection layer 2 with the magnetic material added is not uniform.
If the magnetic balls 3 are opposite to the first ring magnet 4 and the second ring magnet 5 with the same magnetic poles and C1 ≠ C2, it further includes the following steps:
if C1 is larger than C2, a low density region exists in the portion from the magnetic ball 3 to the second ring magnet 5 in the pipe protective layer 2;
if C1 is smaller than C2, a low density region exists in the portion of the pipe protective layer 2 from the magnetic ball 3 to the first ring magnet 4.
If the magnetic balls 3 are opposite to the first ring magnet 4 and the second ring magnet 5 in terms of unlike magnetic poles and C1 ≠ C2, it further includes the following steps:
if C1 is larger than C2, a low density region exists in the portion of the pipe protective layer 2 from the magnetic ball 3 to the first ring magnet 4;
if C1 is smaller than C2, a low density region exists in the portion from the magnetic ball 3 to the second ring magnet 5 in the pipe protective layer 2.
Detailed description of the invention
As shown in fig. 2, in the pipe protective layer density monitoring device according to the second embodiment, a first electrode plate 11 and a second electrode plate 12 are fixedly provided at the 12 o 'clock position of the first ring magnet 4 and at the position opposite thereto on the first frame 9, the first electrode plate 11 and the second electrode plate 12 form a first capacitance sensor, a third electrode plate 13 and a fourth electrode plate 14 are fixedly provided at the 12 o' clock position of the second ring magnet 5 and at the position opposite thereto on the second frame 10, and the third electrode plate 13 and the fourth electrode plate 14 form a second capacitance sensor.
A fifth electrode plate 15 and a sixth electrode plate 16 are further fixedly arranged at the 6 o 'clock position of the first ring magnet 4 and the position on the first frame 9 opposite thereto, the fifth electrode plate 15 and the sixth electrode plate 16 form a third capacitance sensor, a seventh electrode plate 17 and an eighth electrode plate 18 are further fixedly arranged at the 6 o' clock position of the second ring magnet 5 and the position on the second frame 10 opposite thereto, and the seventh electrode plate 17 and the eighth electrode plate 18 form a fourth capacitance sensor.
The method for monitoring the density of the pipeline protection layer, which is implemented on the device for monitoring the density of the pipeline protection layer provided by the embodiment, comprises the following steps:
step a, arranging a first annular magnet 4 and a second annular magnet 5 on a pipeline protection layer 2, wherein the distance from the initial position of the first annular magnet 4 to a magnetic ball 3 is required to be equal to the distance from the initial position of the second annular magnet 5 to the magnetic ball 3;
step b, monitoring the first capacitance sensor capacitance value C1, the second capacitance sensor capacitance value C2, the third capacitance sensor capacitance value C3 and the fourth capacitance sensor capacitance value C4, comparing the values of (C1+ C3)/2 and (C2+ C4)/2, if:
(C1+ C3)/2 ═ C2+ C4)/2, the magnetic balls 3 will produce the same amount of attraction or repulsion to the first ring magnet 4 and the second ring magnet 5, the pipe protective layer 2 added with magnetic material has uniform density;
(C1+ C3)/2 ≠ (C2+ C4)/2, the magnetic balls 3 will generate attraction force or repulsion force of different magnitude to the first ring magnet 4 and the second ring magnet 5, and the density of the pipe protection layer 2 added with magnetic material is not uniform;
if the magnetic balls 3 are opposite to the first ring magnet 4 and the second ring magnet 5 with the same-name magnetic poles and (C1+ C3)/2 ≠ (C2+ C4)/2, it further includes the following steps:
if (C1+ C3)/2 is greater than (C2+ C4)/2, a low density region exists in the portion from the magnetic ball 3 to the second ring magnet 5 in the pipe protective layer 2;
if (C1+ C3)/2 is smaller than (C2+ C4)/2, a low density region exists in the portion of the magnetic ball 3 in the pipe protective layer 2 up to the first ring magnet 4.
If the magnetic balls 3 are opposite to the first ring magnet 4 and the second ring magnet 5 with different magnetic poles and (C1+ C3)/2 ≠ (C2+ C4)/2, it further comprises the following steps:
if (C1+ C3)/2 is greater than (C2+ C4)/2, a low density region exists in the portion of the magnetic sphere 3 in the pipe protective layer 2 up to the first ring magnet 4;
if (C1+ C3)/2 is smaller than (C2+ C4)/2, a low density region exists in the portion from the magnetic ball 3 to the second ring magnet 5 in the pipe protective layer 2.
In the third embodiment, two monitoring points are added on the basis of the second embodiment, the difference of the acting force of the magnetic ball on the ring magnets on two sides can be measured more accurately by monitoring the average value of the capacitance generated by the two pairs of electrode plates at the positions of 12 o 'clock and 6 o' clock of the ring magnets, and the error of the capacitance value generated by the pair of electrode plates 1 when the difference of the acting force of the magnetic ball on the ring magnets on two sides is expressed is avoided.
Detailed description of the invention
As shown in fig. 3 and 4, in the pipe protective layer density monitoring device provided in this embodiment, on the basis of the third embodiment, a first rotating shaft 19 is disposed at a 9 o' clock position of a first annular magnet 4, and the first rotating shaft 19 passes through the first annular magnet 4 and is fixed on the outer wall of the pipe protective layer 2 by a first fixing member 21 at one end of the first rotating shaft 19; a second rotating shaft 20 is arranged at the 3 o' clock position of the first annular magnet 4, and the second rotating shaft 20 penetrates through the first annular magnet 4 and is fixed on the outer wall of the pipeline protective layer 2 through a second fixing piece 22 at one end of the second rotating shaft 20; the first ring magnet 4 can perform deflection motion with the first rotating shaft 19 and the second rotating shaft 20 as axes at a fixed position outside the pipe protective layer 2, as shown in fig. 5;
the method for monitoring the density of the pipeline protection layer, which is implemented on the device for monitoring the density of the pipeline protection layer provided by the embodiment, comprises the following steps:
step a, fixedly arranging a first annular magnet 4 on the outer wall of a pipeline protective layer 2 through a first rotating shaft 19 and a second rotating shaft 20, wherein the initial distance from a first electrode plate 11 on the first annular magnet 4 to a second electrode plate 12 on a frame 9 is required to be equal to the initial distance from a fifth electrode plate 15 to a sixth electrode plate 16;
step b, monitoring the capacitance value C1 of the first capacitive sensor and the capacitance value C3 of the third capacitive sensor, if:
c1 is C3, the magnetic balls 3 generate the same attractive force or repulsive force to the 12 o 'clock position and the 6 o' clock position of the first ring magnet 4, and the top and bottom of the pipe protection layer between the magnetic balls 3 and the first ring magnet 4 in the pipe protection layer 2 added with the magnetic material have uniform density; c1 ≠ C2, the magnetic balls 3 generate different attractive forces or repulsive forces at 12 o 'clock position and 6 o' clock position of the first ring magnet 4, and the density of the top and the bottom of the pipe protection layer between the magnetic balls 3 and the first ring magnet 4 in the pipe protection layer 2 added with the magnetic material is not uniform;
if the magnetic balls 3 and the first ring magnet 4 are opposite in like magnetic poles and C1 ≠ C3, it further includes the following steps:
if C1 is greater than C3, a low density region exists from the magnetic ball 3 in the pipe protective layer 2 to the bottom pipe protective layer of the first ring magnet 4;
if C1 is smaller than C3, a low density region exists in the pipe shield 2 from the magnetic ball 3 to the top of the first ring magnet 4.
If the magnetic balls 3 are opposite to the first ring magnet 4 and the second ring magnet 5 in terms of unlike magnetic poles and C1 ≠ C2, it further includes the following steps:
if C1 is greater than C3, a low density region exists in the pipe shield 2 from the magnetic balls 3 to the top of the first ring magnet 4;
if C1 is smaller than C3, a low density region exists from the magnetic ball 3 in the pipe protective layer 2 to the bottom pipe protective layer of the first ring magnet 4.
The embodiment can avoid the error caused by insensitive motion of the ring magnet outside the pipeline protection layer, and can simultaneously monitor the position of the low-density area on the top or the bottom of the pipeline protection layer through the capacitance comparison of C1 and C3.
Detailed description of the invention
In the device for monitoring the density of the pipeline protection layer provided by the present embodiment, as shown in fig. 6, the opposite magnetic poles of the magnetic balls 3 are arranged in a direction perpendicular to the pipeline 1, the first annular magnet 4 is arranged outside the pipeline protection layer where the magnetic balls 3 are located, and the first annular magnet 4 is arranged opposite to the opposite magnetic poles of the magnetic balls 3; a first spring screw 27 and a second spring screw 28 are respectively arranged at the 12 o ' clock position and the 6 o ' clock position of the first annular magnet 4, a ninth electrode plate 23 and a tenth electrode plate 24 are respectively fixedly arranged at the 9 o ' clock position of the first annular magnet 4 and the position opposite to the first annular magnet on the outer wall of the pipeline protective layer, the ninth electrode plate 23 and the tenth electrode plate 24 form a fifth capacitance sensor, an eleventh electrode plate 25 and a twelfth electrode plate 26 are respectively and fixedly arranged at the 3 o' clock position of the first ring magnet 4 and the position opposite to the first ring magnet on the outer wall of the pipeline protection layer, the eleventh electrode plate 25 and the twelfth electrode plate 26 form a sixth capacitive sensor, a first spring screw 27 and a second spring screw 28 are used to fix the first ring magnet in a centered position, so that the ninth electrode plate 23 and the tenth electrode plate 24, and the eleventh electrode plate 25 and the twelfth electrode plate 26 are respectively located at opposite positions.
The method for monitoring the density of the pipeline protection layer, which is implemented on the device for monitoring the density of the pipeline protection layer provided by the embodiment, comprises the following steps:
step a, fixing the first ring magnet 4 at the positive center position, and requiring the ninth electrode plate 23 and the tenth electrode plate 24, and the eleventh electrode plate 25 and the twelfth electrode plate 26 to be respectively located at the opposite positions, so as to detect the capacitance values C5 and C6 of the fifth capacitive sensor;
step b, removing the first spring screw 27 and the second spring screw 28, so that the first ring magnet 4 can perform eccentric motion by using the pipeline direction as an axis under the action of the magnetic ball, as shown in fig. 7, monitoring a capacitance value C5 'of the fifth capacitive sensor and a capacitance value C6' of the sixth capacitive sensor, if:
c5 ═ C5 'and C6 ═ C6', the first ring magnet 4 did not move eccentrically, and the density of the pipe protective layer surrounded by the first ring magnet 4 in the pipe protective layer 2 to which the magnetic material was added was uniform;
c5 ≠ C5 'and C6 ≠ C6', the first ring magnet 4 eccentrically moves, and the density of the pipe protective layer surrounded by the first ring magnet 4 in the pipe protective layer 2 added with the magnetic material is not uniform;
the present embodiment is used to detect whether the density of the pipe protective layer surrounded by the first ring magnet 4 is uniform.
Claims (1)
1. A method for monitoring the density of a pipeline protection layer is characterized by comprising the following steps:
step a, arranging a first annular magnet (4) and a second annular magnet (5) on a pipeline protective layer (2), wherein the distance from the initial position of the first annular magnet (4) to a magnetic ball (3) is required to be equal to the distance from the initial position of the second annular magnet (5) to the magnetic ball (3);
step b, monitoring the capacitance value C1 of the first capacitive sensor and the capacitance value C2 of the second capacitive sensor, if:
c1 is C2, the magnetic ball (3) can generate the same attractive force or repulsive force to the first annular magnet (4) and the second annular magnet (5), and the density of the pipeline protection layer (2) added with the magnetic material is uniform; c1 ≠ C2, the magnetic balls (3) can generate attraction force or repulsion force with different sizes on the first annular magnet (4) and the second annular magnet (5), and the density of the pipeline protection layer (2) added with the magnetic material is not uniform; if the magnetic ball (3) is opposite to the first annular magnet (4) and the second annular magnet (5) in terms of like magnetic poles and C1 ≠ C2, the method further comprises the following steps:
if C1 is larger than C2, a low-density area exists from the magnetic ball (3) to the second annular magnet (5) in the pipeline protection layer (2);
if C1 is less than C2, a low-density region exists from the magnetic ball (3) to the first ring magnet (4) in the pipeline protection layer (2);
if the magnetic ball (3) is opposite to the first annular magnet (4) and the second annular magnet (5) in terms of unlike magnetic poles and C1 is not equal to C2, the method further comprises the following steps:
if C1 is larger than C2, a low-density area exists from the magnetic ball (3) to the first ring magnet (4) in the pipeline protection layer (2);
if C1 is smaller than C2, a low-density region exists from the magnetic ball (3) to the second annular magnet (5) in the pipeline protection layer (2);
the monitoring method is realized on the basis of a pipeline protective layer density monitoring device, wherein the monitoring device comprises a pipeline (1) made of a non-magnetic material, a pipeline protective layer (2) which surrounds the periphery of the pipeline (1) and is added with a magnetic material, a magnetic ball (3) arranged inside the pipeline (1), and a first annular magnet (4), a second annular magnet (5), a first frame (9) and a second frame (10) which surround the outside of the pipeline protective layer (2);
the magnetic ball (3) is fixedly arranged in a magnetic ball frame (6) made of a non-magnetic material, the magnetic ball frame (6) is a hollow ball body, an upper support (7) made of the non-magnetic material and a lower support (8) made of the non-magnetic material are arranged outside the magnetic ball frame (6), the upper support (7) and the lower support (8) are arranged at two opposite positions on the same axial lead of the magnetic ball frame (6), the magnetic ball frame (6) and the magnetic ball (3) therein are fixed in the pipeline (1) through the upper support (7) and the lower support (8) which are perpendicular to the pipeline (1), and the opposite magnetic poles of the magnetic ball (3) are arranged along the direction of the pipeline (1);
a first frame (9) and a second frame (10) are fixedly arranged on two sides of the magnetic ball frame (6) at equal intervals respectively, a first annular magnet (4) is arranged between the magnetic ball frame (6) and the first frame (9), a second annular magnet (5) is arranged between the magnetic ball frame (6) and the second frame (10), and opposite magnetic poles of the first annular magnet (4) and the second annular magnet (5) are arranged oppositely; the first annular magnet (4) and the second annular magnet (5) are identical in shape and volume and can move in position along the pipeline (1);
the first annular magnet (4) and the first frame (9) are respectively and fixedly provided with a first electrode plate (11) and a second electrode plate (12) at opposite positions, the first electrode plate (11) and the second electrode plate (12) form a first capacitance sensor, the second annular magnet (5) and the second frame (10) are respectively and fixedly provided with a third electrode plate (13) and a fourth electrode plate (14) at opposite positions, and the third electrode plate (13) and the fourth electrode plate (14) form a second capacitance sensor.
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| CN201810205630.0A CN108489857B (en) | 2018-03-13 | 2018-03-13 | Pipeline protection layer density monitoring method |
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|---|---|---|---|
| CN201810205630.0A CN108489857B (en) | 2018-03-13 | 2018-03-13 | Pipeline protection layer density monitoring method |
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| CN108489857B true CN108489857B (en) | 2020-11-06 |
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| CN101201340A (en) * | 2006-12-15 | 2008-06-18 | 刘瑞 | Magnetic suspension type multipurpose measurer for hyperthermia steam humidity, high pressure water level and medium density |
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| EP1385081B1 (en) * | 2002-07-26 | 2016-11-02 | NEC Corporation | Inputting device and mobile terminal |
| CN107707151A (en) * | 2017-08-28 | 2018-02-16 | 湘潭大学 | A kind of piezoelectric harvester applied to pipeline fluid monitoring |
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2018
- 2018-03-13 CN CN201810205630.0A patent/CN108489857B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1385081B1 (en) * | 2002-07-26 | 2016-11-02 | NEC Corporation | Inputting device and mobile terminal |
| CN101201340A (en) * | 2006-12-15 | 2008-06-18 | 刘瑞 | Magnetic suspension type multipurpose measurer for hyperthermia steam humidity, high pressure water level and medium density |
| CN102759492A (en) * | 2012-07-27 | 2012-10-31 | 上海交通大学 | Device for measuring density of cryogenic fluid |
| CN204421983U (en) * | 2015-02-28 | 2015-06-24 | 长春市斯普瑞新技术有限责任公司 | A kind of electromagnetic flow transducer |
| CN107707151A (en) * | 2017-08-28 | 2018-02-16 | 湘潭大学 | A kind of piezoelectric harvester applied to pipeline fluid monitoring |
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Effective date of registration: 20201020 Address after: High stack Road 276800 Shandong province Rizhao City international marine Chengtao Luo town Applicant after: SHANDONG WATER PIPELINE Co.,Ltd. Address before: 150000 Po Guo Street 33, Ping Fang District, Harbin, Heilongjiang Applicant before: Zhao Jing |
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