CN108332039B - Three-point laser type gas chamber piston inclination detection method - Google Patents

Three-point laser type gas chamber piston inclination detection method Download PDF

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CN108332039B
CN108332039B CN201710036180.2A CN201710036180A CN108332039B CN 108332039 B CN108332039 B CN 108332039B CN 201710036180 A CN201710036180 A CN 201710036180A CN 108332039 B CN108332039 B CN 108332039B
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方喆
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Baoshan Iron and Steel Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17B—GAS-HOLDERS OF VARIABLE CAPACITY
    • F17B1/00—Gas-holders of variable capacity
    • F17B1/02—Details
    • F17B1/14—Safety devices, e.g. prevention of excess pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels

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  • Radar, Positioning & Navigation (AREA)
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  • Length Measuring Devices By Optical Means (AREA)
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Abstract

The invention discloses a three-point laser type gas chamber piston inclination detection method, which comprises the following steps: three laser range finders are arranged on the top cover of the shell of the gas holder, three laser range finders are arranged on the top coverThe laser range finders are uniformly distributed on a circumference which takes the center of the top cover as the center of a circle; three laser reflection plates are horizontally arranged on the upper surface of the piston in the gas chamber at positions corresponding to the three laser range finders; the laser emitted by each laser range finder can penetrate through the top cover and irradiate each laser reflection plate on the upper surface of the piston in the gas chamber to measure the distance L from each laser range finder to each corresponding laser reflection plateA、LB、LC(ii) a According to the distance L from each laser range finder to each corresponding laser reflection plateA、LB、LCCalculating an inclination value X of any point on the edge of the piston with respect to the center of the pistonX. The method of the invention can accurately calculate the inclination value of any point on the outer diameter of the piston.

Description

Three-point laser type gas chamber piston inclination detection method
Technical Field
The invention relates to a method for detecting the inclination of a gas chamber piston, in particular to a three-point laser type method for detecting the inclination of the gas chamber piston.
Background
The gas holder is used as a storage facility of gas and is widely applied to various enterprises. At present, dry gas chambers are the mainstream. The storage space is adjusted by the ascending and descending of a piston in the gas holder, the ascending and descending movement of the piston is determined by the throughput of gas, when the gas amount in the gas holder is increased, the internal pressure of the gas is increased, and the piston is ascended due to the increase of the supporting force; when the gas amount in the gas chamber is reduced, the internal pressure of the gas is reduced, and the piston is reduced due to the reduction of the supporting force. The balance weight of the piston is constant, and the gas pressure of the gas holder is always stable no matter the capacity of the gas holder is increased or decreased.
The inclination degree of the gas chamber piston in the operation process is a main technical parameter for reflecting the state of the gas chamber equipment and whether the gas chamber equipment can safely operate. In the actual operation process of the gas chamber, the motion of the piston is often influenced by various factors such as column deformation, edge guide rails, guide wheel/steel wire abrasion and the like, so that the local lifting is blocked, and the piston is inclined. The piston inclines beyond a certain range, so that the blocking phenomenon is easy to occur, the gas pressure in the gas cabinet changes, and the gas cabinet loses the pressure stabilizing effect on the system. Extreme conditions can also lead to explosions.
The online detection of the inclination of the piston is difficult due to the restriction of factors such as huge volume of the gas holder, continuous movement of the piston up and down and the like. At present, various problems exist in the effectiveness and the practicability of various online inclination detection systems for gas chamber pistons, and due effects cannot be exerted.
At present, the inclination measurement methods of the gas holder mainly comprise the following methods:
1) do benefit to U type pipe principle, detect the slope through detecting the liquid level deviation.
The mode has the following defects and defects: by adopting the principle of a U-shaped pipe, four diagonal detection water tanks and pipelines communicated with the water tanks need to be laid on the surface of the piston. Because the gas holder piston area is huge (the general diameter is more than 60m), the construction amount on the piston is very large. After the operation is carried out for a period of time, because algae or dirt in water is gathered or air bubbles brought by supplementing water after liquid is evaporated are easy to generate unsmooth water pipe communication, so that inaccurate measurement is caused.
2) The piston inclination is reflected by detecting X, Y the inclination of shaft 2 directions by using the principle of heavy hammer.
The mode has the following defects and defects: by using the weight principle, a differential capacitor circuit driven by two weights, X and Y, is disposed on the surface of the piston. Because the diameter of the piston is relative to, the inclination of the piston generally belongs to millimeter level, the detection precision requirement on the capacitance differential circuit is very high, and the piston is easily interfered by an external interference source. The practical application effect is not good enough. And the electric signal is transmitted to the outside of the cabinet from the surface of the piston through a suspended cable. The amount of work such as winding up of cables is large.
3) The angular position of the piston 4 is measured directly and the inclination of the piston is reflected by the difference in position.
The mode has the following defects and defects: the angular position of the piston 4 is measured directly. If the cabinet position is detected through a mechanical cabinet position meter or a non-contact type meter, the inclination value of the diagonal angle of the piston is converted through calculation. Typically only four tilt values reflecting the mounting direction of the detection point. Meanwhile, the investment is relatively large because 4 measuring points are needed.
Disclosure of Invention
The invention aims to provide a high-precision method for detecting the inclination of a piston of a gas holder, and can detect the inclination degree of the piston at any position.
The invention discloses a three-point laser type gas chamber piston inclination detection method, which comprises the following steps: the method comprises the following steps that three laser range finders are installed on a top cover of a shell of the gas holder, and the three laser range finders are uniformly distributed on a circumference which takes the center of the top cover as a circle center; three laser reflection plates are horizontally arranged on the upper surface of the piston in the gas chamber at positions corresponding to the three laser range finders; through holes are formed in the top cover and positioned below the laser range finders, so that laser emitted by the laser range finders can penetrate through the top cover and irradiate the laser reflecting plates on the upper surface of the piston in the gas chamber, and the distance L from each laser range finder to the corresponding laser reflecting plate is measuredA、LB、LC(ii) a According to the distance L from each laser range finder to each corresponding laser reflection plateA、LB、LCCalculating an inclination value X of any point on the edge of the piston with respect to the center of the pistonX。
Further, the distance L from each laser range finder to each corresponding laser reflection plate is determinedA、LB、LCCalculating an inclination value X of any point on the edge of the piston with respect to the center point of the pistonXThe method comprises the following steps: the method comprises the following steps: determining a plane P by using center points of three through holes arranged below the three laser range finders, wherein mapping points of the center points of the three through holes on the plane P are A, B, C respectively, mapping points of any point on the edge of the piston on the plane P are X, and mapping points of the center point of the piston on the plane P are O; step two: connecting points AB, BC and CA on the plane P to establish an equilateral triangle delta ABC, establishing a circumference O by taking a point O as a circle center and OA as a radius, connecting the point OX, and taking an intersection point of a line segment OX and the side of the delta ABC as a point w and an intersection point of the line segment OX and the circumference of the circumference O as a point m; step three: determining a tilt value X of any point on the edge of the piston relative to the center point of the piston according to the following methodX: when point w is located at the AB edge of Δ ABC,
Figure BDA0001211878410000031
when point w is located on the BC-side of Δ ABC,
Figure BDA0001211878410000041
when point w is located on the CA side of Δ ABC,
Figure BDA0001211878410000042
where θ is the angle OX to OA, r1 is the distance from point A to point O, and r2 is the distance from point X to point O.
In order to filter out accidental sudden change values, each laser distance meter measures the distance to each corresponding laser reflection plate in real time, and if the difference between the current measured value and the last measured value exceeds a threshold value, the last measured value is taken as the final current measured value.
In order to suppress periodic interference, the N-1 historical measurement values measured by each laser range finder and the final current measurement value are subjected to arithmetic mean to obtain the distance L from each laser range finder to each corresponding laser reflection plateA、LB、LC。
According to the three-point laser type gas chamber piston inclination detection method, the distance measuring instrument is maintained at the top of the gas chamber, and does not need to enter the interior of the gas chamber body, so that the maintenance and calibration of the detector are greatly facilitated; the existing control system of the gas chamber can be utilized to measure the inclination of the piston at any angle, thereby bringing great convenience to the operation management and equipment management of the gas chamber; the high measurement precision of laser ranging ensures the detection accuracy and can completely meet various requirements of the gas chamber.
Drawings
FIG. 1 is a schematic view of the installation positions of a laser range finder and a laser reflection plate of the three-point laser type gas holder piston inclination detection method of the present invention;
FIG. 2 is a schematic diagram illustrating the calculation principle of the three-point laser type gas holder piston inclination detection method according to the present invention;
fig. 3 is a schematic diagram of an application display method of the three-point laser gas holder piston inclination detection method of the present invention.
Detailed Description
The three-point laser type gas holder piston inclination detecting method of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description, but the present invention is not limited thereto.
The invention relates to a three-point laser type gas chamber piston inclination detection method which is established on the basis of an installed laser range finder and a laser reflection plate and performs inclination detection by using a measurement result of the laser range finder.
As shown in fig. 1, three laser distance measuring instruments 3 are mounted on a top cover of a shell of a gas holder 1, and the three laser distance measuring instruments 3 are uniformly distributed on a circumference which takes the center of the top cover as a circle center; three laser reflection plates 4 are horizontally arranged on the upper surface of the piston 2 in the gas chamber 1 and at positions corresponding to the three laser distance measuring instruments 3; through holes are arranged at positions below the laser range finders 3 on the top cover, so that laser emitted by the laser range finders 3 can penetrate through the top cover to irradiate the laser reflecting plates 4 on the upper surface of the piston 2 in the gas tank 1, and the distances L from the laser range finders 3 to the corresponding laser reflecting plates 4 are measuredA、LB、LC。
When the piston 2 in the gas chamber 1 floats up and down, each laser distance measuring instrument 3 can respectively and accurately measure the distance L from each laser distance measuring instrument 3 to each corresponding laser reflecting plate 4A、LB、LCA change in (c). The distance L from each laser distance meter 3 to each corresponding laser reflection plate 4A、LB、LCThe distance between the corresponding position of the upper surface of the piston 2 and the top cover of the gas holder 1 is actually measured, and the change of the value can reflect the up-and-down movement distance of the piston and the inclination condition of the plane of the piston.
In order to make the tilt measurement as accurate as possible, the three laser rangefinders 3 should be mounted as close to the edge of the roof as possible, but should avoid other facilities and devices on the roof.
Then, by using a data processing unit (such as PLC, DCS, single chip microcomputer, etc.), the distance L between each laser range finder 3 and each corresponding laser reflection plate 4 can be measured according to the distance L measured by each laser range finder 3A、LB、LCCalculating an inclination value X of any point on the edge of the piston with respect to the center of the pistonX. Referring to fig. 2, the method of calculation includes the steps of:
the method comprises the following steps: a plane P is determined by the center points of three through holes arranged below the three laser range finders, the mapping points of the center points of the three through holes on the plane P are A, B, C respectively, the mapping point of any point on the edge of the piston on the plane P is X, and the mapping point of the center point of the piston on the plane P is O.
Step two: the points AB, BC, CA are connected on the plane P to establish an equilateral triangle delta ABC, a circle O is established by taking the point O as the center of a circle and OA as the radius, the point OX is connected, the point W is the intersection point of the line segment OX and the side of the delta ABC, and the point m is the intersection point of the line segment OX and the circle O.
Step three: determining the inclination value X of any point on the edge of the piston relative to the center point of the piston according to the following methodX：
When point w is located at the AB edge of Δ ABC,
Figure BDA0001211878410000061
when point w is located on the BC-side of Δ ABC,
Figure BDA0001211878410000071
when point w is located on the CA side of Δ ABC,
Figure BDA0001211878410000072
where θ is the angle OX to OA, r1 is the distance from point A to point O, and r2 is the distance from point X to point O.
With continued reference to fig. 2, the derivation of the above equation is as follows:
since three points define a plane, the relative distance L at point OOComprises the following steps:
LO＝(LA+LB+LC)/3。
the macroblock Δ ABC is an equilateral triangle,
oh-r 1/2, where point h is the foot from point C to AB,
∵∠AOh＝60°，
∴∠wOh＝60°-θ，
do Pi Δ Ohw is a right triangle with:
tan∠wOh＝tan(60°-θ)＝wh/Oh，
therefore, wh ═ Oh ═ tan (60 ° - θ) ═ r1/2 × (60 ° - θ).
DeltaABC is an equilateral triangle on the circumference,
side length
Figure BDA0001211878410000081
Thus, there are:
Figure BDA0001211878410000082
Figure BDA0001211878410000083
Figure BDA0001211878410000084
Figure BDA0001211878410000085
a quart of Dou Δ Ohw is a right triangle,
∴Oh＝Ow*COS∠wOh＝Ow*COS(60°-θ)，
Figure BDA0001211878410000086
Figure BDA0001211878410000087
the entrance of the Japanese patent application B is a straight line,
l corresponding to point ABAAnd LBThe relative distance between the points is linearly distributed, and the L corresponding to the point Om is the same as the LOAnd LmThe relative distance between them is also linearly distributed.
In the range 0 DEG < theta.ltoreq.120 DEG, i.e. when w is in the region of the side AB:
relative distance L at point wwComprises the following steps:
Figure BDA0001211878410000091
tilt value X at point w with respect to center point OwComprises the following steps:
Xw＝Lw-LO。
tilt value X at virtual circumference m with respect to center point OmComprises the following steps:
Figure BDA0001211878410000092
∵LO＝(LA+LB+LC)/3，
thus, it is possible to provide
Figure BDA0001211878410000093
Similarly, in the range of 120 < θ ≦ 240, i.e., when w is within the region of side BC:
Figure BDA0001211878410000094
similarly, in the range of 240 ° < θ ≦ 360 °, i.e., when w is within the region of side CA:
Figure BDA0001211878410000095
(ii) the benzodiazepine is collinear with Om,
the projection in this direction is also linearly distributed,
∴
Figure BDA0001211878410000101
tilt value X at m pointmConverting to the inclined value X at the point X of the outer diameter of the pistonX：
Figure BDA0001211878410000102
Thus, in the range of 0 DEG < theta.ltoreq.120 DEG, i.e., AB region, the inclination value X at the X pointX：
Figure BDA0001211878410000103
In the range of 120 < theta.ltoreq.240, i.e. the BC region, the tilt value XX at point X:
Figure BDA0001211878410000104
in the range of 240 DEG < theta.ltoreq.360 DEG, i.e., CA region, tilt value XX at X point:
Figure BDA0001211878410000105
the method can utilize the real-time measurement result of the laser range finder to calculate the inclination value of each point on the outer diameter of the piston relative to the center point of the piston in real time.
In order to filter out accidental sudden change values, for example, instantaneous inclination caused by shaking existing in the normal lifting process of the piston is eliminated, frequent disturbance false alarm is avoided, and the distance L measured by each laser range finder in real time isA、LB、LCAnd (4) judging: and if the difference between the current measured value and the last measured value exceeds the threshold value, discarding the current measured value and taking the last measured value as the final current measured value.
In order to further suppress the periodic interference, the N-1 historical measurement values and the final current measurement value in the measurement of each laser range finder are arithmetically averaged, and the obtained average value is used as the distance L participating in the calculation of the inclination valueA、LB、LC。
The tilt values calculated in real time for each point on the outer diameter of the piston may be displayed graphically as shown in fig. 3. The whole cabinet body of the gas holder in fig. 3 includes 32 vertical columns 5, and for convenient marking, the inclination value at each vertical column can be calculated, and then the inclination value is displayed in the inclination value display frame 6 beside the vertical column 5 represented by the interface in the interface mode shown in fig. 3, so that the worker can clearly and intuitively observe the inclination value of each point of the piston, and the position with the most inclination can be distinguished, and the posture of the piston can be adjusted more accurately.
According to the three-point laser type gas chamber piston inclination detection method, the distance measuring instrument is maintained at the top of the gas chamber, and does not need to enter the interior of the gas chamber body, so that the maintenance and calibration of the detector are greatly facilitated; the existing control system of the gas chamber can be utilized to measure the inclination of the piston at any angle, thereby bringing great convenience to the operation management and equipment management of the gas chamber; the high measurement precision of laser ranging ensures the detection accuracy and can completely meet various requirements of the gas chamber.
The above embodiments are merely exemplary embodiments of the present invention, which should not be construed as limiting the scope of the present invention, which is defined by the following claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and these modifications and equivalents should also be construed as falling within the scope of the present invention.

Claims (3)

1. A three-point laser type gas chamber piston inclination detection method is characterized by comprising the following steps:
the method comprises the following steps that three laser range finders are installed on a top cover of a shell of the gas holder, and the three laser range finders are uniformly distributed on a circumference which takes the center of the top cover as a circle center; three laser reflection plates are horizontally arranged on the upper surface of the piston in the gas chamber at positions corresponding to the three laser range finders; through holes are formed in the top cover and positioned below the laser range finders, so that laser emitted by the laser range finders can penetrate through the top cover and irradiate the laser reflecting plates on the upper surface of the piston in the gas chamber, and the distance L from each laser range finder to the corresponding laser reflecting plate is measuredA、LB、LC；
According to the distance L from each laser range finder to each corresponding laser reflection plateA、LB、LCCalculating an inclination value X of any point on the edge of the piston with respect to the center of the pistonX；
The distance L from each laser range finder to each corresponding laser reflection plateA、LB、LCCalculating an inclination value X of any point on the edge of the piston with respect to the center point of the pistonXThe method comprises the following steps:
the method comprises the following steps: determining a plane P by using center points of three through holes arranged below the three laser range finders, wherein mapping points of the center points of the three through holes on the plane P are A, B, C respectively, mapping points of any point on the edge of the piston on the plane P are X, and mapping points of the center point of the piston on the plane P are O;
step two: connecting points AB, BC and CA on the plane P to establish an equilateral triangle delta ABC, establishing a circumference O by taking a point O as a circle center and OA as a radius, connecting the point OX, and taking an intersection point of a line segment OX and the side of the delta ABC as a point w and an intersection point of the line segment OX and the circumference of the circumference O as a point m;
step three: determining a tilt value X of any point on the edge of the piston relative to the center point of the piston according to the following methodX：
When point w is located at the AB edge of Δ ABC,
Figure FDA0002644121800000021
when point w is located on the BC-side of Δ ABC,
Figure FDA0002644121800000022
when point w is located on the CA side of Δ ABC,
Figure FDA0002644121800000023
where θ is the angle of OX to OA, r1 is the distance from point A to point O, r2 is the distance from point X to point O;
the whole cabinet body of the gas cabinet comprises 32 upright posts, the inclination value of each upright post is calculated, and the inclination value is displayed in the inclination value display frame corresponding to the upright post.
2. The method of claim 1, wherein each laser range finder measures the distance to each corresponding laser reflector in real time, and if the difference between the current measurement value and the last measurement value exceeds a threshold value, the last measurement value is used as the final current measurement value.
3. The three-point laser type gas holder piston inclination detecting method according to claim 2, wherein the distance L from each laser range finder to the corresponding laser reflecting plate is obtained by arithmetically averaging N-1 historical measurement values measured by each laser range finder and the final current measurement valueA、LB、LC。
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JP2006058205A (en) * 2004-08-23 2006-03-02 Sumitomo Metal Ind Ltd Dry gash older and apparatus for detecting tilting of piston of dry gasholder
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JP5288275B2 (en) * 2009-07-14 2013-09-11 新日鐵住金株式会社 Gas holder abnormality detection device
CN201662420U (en) * 2010-03-12 2010-12-01 大庆华凯石油化工设计工程有限公司 Integrated dry-gas holder counter metering and piston gradient detecting device
CN103759708B (en) * 2013-12-31 2015-10-07 北京金风科创风电设备有限公司 The measuring method of the degree of tilt of pylon
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CN104006800A (en) * 2014-06-03 2014-08-27 中冶南方工程技术有限公司 Device and method for measuring levelness of piston of gas chamber
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