CN115790532A - Method for measuring inclination value of gas chamber piston - Google Patents
Method for measuring inclination value of gas chamber piston Download PDFInfo
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- CN115790532A CN115790532A CN202211516007.XA CN202211516007A CN115790532A CN 115790532 A CN115790532 A CN 115790532A CN 202211516007 A CN202211516007 A CN 202211516007A CN 115790532 A CN115790532 A CN 115790532A
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- 239000002184 metal Substances 0.000 claims abstract description 15
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- 230000000712 assembly Effects 0.000 claims abstract description 4
- 238000000429 assembly Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 24
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- 238000004891 communication Methods 0.000 description 4
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- 238000012423 maintenance Methods 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the field of gas chambers, in particular to a method for measuring a piston inclination value of a gas chamber. The method comprises the following steps: the method comprises the following steps that three measuring points are arranged on the upper surface of a piston of a gas chamber, the three measuring points are distributed in an annular array by taking the central point of the piston of the gas chamber as the center, and a group of gas chamber piston height measuring assemblies are respectively arranged at each measuring point; the gas holder piston height measuring assembly comprises: the device comprises a weighing instrument, a take-up cylinder and a metal chain, wherein the weighing instrument is fixed on a measuring point, the take-up cylinder is a weighing tray of the weighing instrument, the metal chain is a chain-shaped object with weight uniformly distributed in the length direction, one end of the metal chain is fixed on the top of a gas cabinet right above the measuring point, and the other end of the metal chain naturally drops into the take-up cylinder; and calculating the height of the piston of each measuring point according to the difference value between the current weight and the initial weight of the three measuring points measured by the weighing instrument, and calculating the inclination value, the inclination angle and the inclination direction of the piston of the gas chamber through a geometric model of the piston of the gas chamber.
Description
Technical Field
The invention relates to the field of gas chambers, in particular to a method for measuring a piston inclination value of a gas chamber.
Background
The dry gas holder is widely applied to the recovery and storage of byproduct gas of steel enterprises, and the gas holding is realized by the up-and-down movement of a piston in the gas holder. It is very important for the operation manager of the gas holder to know the inclination of the gas holder piston. The gas holder is also provided with a traditional inclination value measuring method which is mainly realized by annular communication of a liquid level meter, a gravity sensor and the like. The annular communication liquid level meter adopts a measuring scheme that three oil tanks with communicated bottoms are arranged on the circumference of a piston of a gas chamber, and the inclined angle of the piston is calculated by respectively measuring the oil levels of the three oil tanks by utilizing the principle of a communication pipe, so that the included angle between the inclined plane of the piston and the original plane and the highest-point inclined direction are calculated. The gravity sensor directly measures the line included angle in two vertical directions after the plane of the piston is inclined through the tilt angle sensor, and then calculates the surface included angle and the highest point direction after the piston is inclined by utilizing the solid geometry principle.
As for the traditional cabinet volume measuring method, the method is widely applied to dry gas cabinets. However, practice has proved that it has many drawbacks: (1) The annular communication liquid level meter has complex system, high construction difficulty and troublesome operation and maintenance, oil and other measuring media which are easy to lose and leak need to be filled in the process, the system response is slow, and the early warning effect is not obvious; (2) The method of the gravity sensor is simple in measurement, but the precision is low, and the requirement on the field working condition is high.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for measuring the inclination of a piston of a gas holder, which is simple, practical, safe and reliable.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for measuring the inclination value of a gas chamber piston is characterized in that three measuring points are arranged on the upper surface of the piston of a gas chamber, the three measuring points are distributed in an annular array by taking the central point of the gas chamber piston as the center, and a group of gas chamber piston height measuring assemblies are respectively arranged at each measuring point; the gas holder piston height measuring assembly comprises: the device comprises a weighing instrument, a take-up drum and a metal chain, wherein the weighing instrument is arranged on a measuring point, the take-up drum is a weighing tray of the weighing instrument, the metal chain is a chain-shaped object with weight uniformly distributed in the length direction, one end of the metal chain is fixed on the top of a gas cabinet and is positioned right above a corresponding test point, and the other end of the metal chain naturally drops into the take-up drum and keeps contact with the inner bottom of the take-up drum;
acquiring the initial weight measured by the weighing instrument at three measuring points when the height of the piston is zero;
acquiring the current weight measured by the weighing instrument at three measuring points when the gas tank runs;
and calculating the height of the piston of each measuring point according to the difference value between the current weight and the initial weight measured by the three measuring points, and calculating the inclination value, the inclination angle and the inclination direction of the piston of the gas holder through a geometric model of the piston of the gas holder.
Further, the tilt value of the piston is expressed as:
the direction of the inclination of the piston is expressed as:
the tilt angle of the piston is expressed as:
wherein h is 1 ＝H 1 -H；h 2 ＝H 2 -H；h 3 ＝H 3 -H；H 1 、H 2 、H 3 Piston heights at three measurement points located on the 0 ° axis, the 120 ° axis, and the 240 ° axis, respectively; h is the average of the piston heights at the three measurement points, i.e. H = H 1 +H 2 +H 3 ÷3。
Further, the piston height of each measurement point is calculated by the following formula:
H i ＝(m b,i -m a,i )÷ρ
wherein i represents the ith measurement point; h i Piston height for the ith measurement point; m is a,i The initial weight of the gas holder when the capacity of the gas holder is zero; m is b,i And p is the linear density of the metal chain, and the weight measured by the weighing instrument is contained in the current gas tank.
Further, the piston height is also used for solving the volume of the gas holder, and is represented as:
V＝π×R 2 ×H
wherein R is the inner radius of the side plate of the gas cabinet.
The invention realizes the following technical effects:
compared with the traditional method for annularly communicating the liquid level meter and the gravity sensor, the method has obvious advantages. Firstly, the method has simple working principle and high stability, and can basically realize maintenance-free; secondly, the adopted equipment is a mature and stable product in the market, and has low cost and reliable quality; thirdly, the method has extremely high precision of the obtained result; finally, the method can accurately measure the cabinet volume and has extremely low requirement on working conditions.
Drawings
FIG. 1 is a general assembly diagram of a dry gas holder for implementing the method for measuring a piston inclination value of a gas holder according to the present invention;
fig. 2 is a schematic view of the dry gas chamber at a minimum piston height;
FIG. 3 is a schematic view of the dry gas chamber at maximum piston height;
FIG. 4 is a schematic diagram of piston height by steel chain weight measurement;
FIG. 5 is a simplified model of a gas holder piston tilt;
fig. 6 is a geometric model of a gas holder piston tilt analysis.
The device comprises a piston 1, a bearing platform 2, a high-precision weighing instrument 3, a take-up drum 4, a steel chain 5, a steel chain fixing point 6, a ventilation clerestory 7 and a cabinet top 8.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
The invention provides a method for measuring a piston inclination value of a gas chamber, which is applied to a dry gas chamber shown in figure 1. The cabinet-type gas chamber belongs to a rubber membrane sealing dry-type gas chamber and is composed of a chamber bottom plate, a side plate, a chamber top, a piston 1 and a T baffle which can move up and down in the chamber, and in the operation process of the gas chamber, the gas inlet and outlet are realized through the up-and-down movement of the piston 1 and the T baffle. The gas holder piston inclination value with high precision and real-time performance is obtained, and important prompts and basis can be provided for operation and maintenance personnel.
In fig. 1, a weighing instrument 3 is arranged on a bearing platform 2 at the upper end of a piston 1, and a take-up drum 4 is placed on the weighing instrument. The steel chain 5 is a chain-shaped object with the weight uniformly distributed in the length direction, one end of the steel chain is fixed at the lower end of a ventilation clerestory 7 of a cabinet top 8, and the other end naturally droops to be contacted with the inner bottom of the take-up drum 4 and is accommodated in the take-up drum 4. The weighing instrument 3, the take-up drum 4 and the steel chain 5 form a set of piston height measuring assembly.
As shown in fig. 2 to 4, the length of the steel chain 5 falling into the take-up drum 4 during the upward or downward movement of the piston 1 changes accordingly, and this change in length can be measured by the high-precision weighing device 3. The concrete relation is that, supposing that the gas holder capacity is zero, namely the piston height is zero, the drooping end of the steel chain 5 just contacts with the inner bottom of the take-up drum 4, and the weight measured by the weighing instrument is the weight of the take-up drum 4. When the gas tank operates, the current weight weighed by the weighing instrument is subtracted from the weight of the take-up drum 4, namely the current weight of the steel chain 5 falling into the take-up drum 4, and the weight is divided by the linear density of the steel chain, so that the length of the steel chain 5 falling into the take-up drum 4 can be obtained, and the length is the lifting height of the piston and can also be called the piston height.
More precisely, when the piston height is zero, the end of the steel chain 5 that hangs down comes into contact with the inner bottom of the take-up drum 4, and the weight measured by the weighing device is the sum of the weight of the take-up drum 4 and the weight of the part of the steel chain 5 that falls into the take-up drum 4, which can be defined as the initial weight. When the gas chamber operates, the initial weight is subtracted from the current weight weighed by the weighing instrument, that is, the variation of the weight of the steel chain 5 falling into the take-up drum 4 is obtained, and the variation is divided by the linear density of the steel chain, so that the variation of the length of the steel chain 5 falling into the take-up drum 4 can be obtained. The variation is the piston height.
The piston height measuring method can be also applied to the measurement of the inclination value of the piston of the gas holder. The method for measuring the inclination value of the gas holder piston specifically comprises the following steps:
three measuring points are arranged in an annular array mode according to the center point of the piston (namely the three measuring points are not arranged on a circular ring with the center point of the piston as the center point, and the included angle between every two three measuring points is 120 degrees), and a group of gas chamber piston height measuring assemblies are arranged at the three measuring points respectively. As shown in fig. 4, the gas holder piston height measuring assembly includes: the high-precision weighing instrument is fixed on a measuring point, the take-up drum is a weighing tray of the high-precision weighing instrument, one end of the steel chain is fixed below a cabinet top right above the measuring point, and the other end naturally droops into the take-up drum and keeps in contact with an inner bottom of the take-up drum.
By means of accurate geometric model analysis of the measured values of the piston heights of the three measuring point positions, the inclination value, the inclination angle and the inclination direction of the piston of the gas holder can be accurately obtained, and meanwhile the real-time gas storage volume of the gas holder can also be obtained.
Figure 5 is a simplified model of the piston tilt of the gas holder as described in the present invention. As shown in FIG. 5, the fixed points of the cabinet top are A1, A2 and A3, the corresponding piston contact points are B1, B2 and B3, and the measured piston height of each measuring point is H 1 、H 2 、H 3 The true piston height is H.
Fig. 6 shows a geometric model of the inclination of the piston of the gas holder according to the present invention. The model can express the measurement of the inclination value of the gas holder through a physical model, and each code number represents the following meanings:
a, fixing a steel chain at the top of the cabinet;
b, a steel chain is arranged at a contact point at the upper end of the piston wire-rewinding cylinder;
m a -the weight measured by the weighing apparatus, or initial weight, kg, at a piston height of 0;
m b when the gas tank is in operation, the weight measured by the weighing instrument, or the current weight, kg;
rho is the linear density of the steel chain, kg/m;
r represents the inner radius of a side plate of the gas tank, m;
h-gas chamber piston height, m;
H 1 -gas chamber piston height, m, measured at 0 ° axis measurement point;
H 2 -gas holder piston height, m, measured at 120 ° axis measurement point;
H 3 -the gas holder piston height, m, measured at the 240 ° axis measurement point;
h 1 -the measured gas cabinet piston height deviation m at the 0 ° axis measurement point;
h 2 -the gas holder piston height deviation, m, measured at 120 ° axis measurement points;
h 3 -the measured gas holder piston height deviation, m, at the 240 ° axis measurement point;
Δ H-gas chamber piston inclination value, m;
beta is the inclination angle of the piston of the gas holder, and represents the included angle between the current piston plane and the horizontal plane;
alpha is the inclination direction of the piston of the gas holder, and represents the included angle between the axis of the highest inclination point of the piston and the clockwise direction of the axis of 0 degree;
v-volume of gas chamber, m 3 。
Assuming that the gas tank is in operation, the current weight measured by the weighing instrument is m b Then the difference in weight of the steel chain falling on the piston with respect to the initial weight is m b -m a The height of the piston is then: h = (m) b -m a ) Rho, and obtaining three piston heights H through three measuring points which are distributed on the piston plate in a central symmetry way by taking the center of a piston circle as a base point 1 、H 2 、H 3 。
The exact height of the piston is now the average of three measurements, namely: h = (H) 1 +H 2 +H 3 ) Div 3, the gas holder piston height deviation for each measurement point can be calculated as follows:
h 1 ＝H 1 -H；h 2 ＝H 2 -H；h 3 ＝H 3 -H。
and then, the inclination value of the piston can be calculated through a geometric model of the piston of the gas chamber as follows:
the inclined direction is as follows:
the inclination angle is:
in addition, the volume V = pi x R of the gas holder can be conveniently obtained 2 ×H。
In specific applications, the steel chain can be replaced by other metal chains with good sagging, acid and alkali resistance and corrosion resistance, such as copper chains or other alloy chains. The thickness of the steel chain and the measurement precision of the weighing instrument can be selected according to requirements.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and all simple modifications or equivalent changes and modifications based on the technical essence of the present invention still belong to the protection scope of the present invention.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for measuring the inclination value of a gas chamber piston is characterized in that three measuring points are arranged on the upper surface of the piston of a gas chamber, the three measuring points are distributed in an annular array by taking the central point of the gas chamber piston as the center, and a group of gas chamber piston height measuring assemblies are respectively arranged at each measuring point; the gas holder piston height measuring assembly comprises: the device comprises a weighing instrument, a take-up drum and a metal chain, wherein the weighing instrument is arranged on a measuring point, the take-up drum is a weighing tray of the weighing instrument, the metal chain is a chain-shaped object with weight uniformly distributed in the length direction, one end of the metal chain is fixed on the top of a gas cabinet and is positioned right above a corresponding test point, and the other end of the metal chain naturally droops into the take-up drum and keeps contact with the inner bottom of the take-up drum;
acquiring the initial weight measured by the weighing instrument at three measuring points when the height of the piston is zero;
acquiring the current weight measured by the weighing instrument at three measuring points when the gas tank runs;
and calculating the height of the piston of each measuring point according to the difference value between the current weight and the initial weight measured by the three measuring points, and calculating the inclination value, the inclination angle and the inclination direction of the piston of the gas chamber through a geometric model of the piston of the gas chamber.
2. The method for measuring the inclination value of the piston of a gas holder according to claim 1,
the tilt value of the piston is expressed as:
the tilt direction of the piston is expressed as:
the tilt angle of the piston is expressed as:
wherein h is 1 ＝H 1 -H；h 2 ＝H 2 -H；h 3 ＝H 3 -H；H 1 、H 2 、H 3 Piston heights at three measurement points located on the 0 ° axis, the 120 ° axis, and the 240 ° axis, respectively; h is the average value of the piston heights at the three measuring points, namely H = (H) 1 +H 2 +H 3 )÷3。
3. The method of claim 2, wherein the piston height at each measurement point is calculated by the following formula:
H i ＝(m b,i -m a,i )÷ρ
wherein i represents the ith measurement point; h i Piston height for the ith measurement point; m is a,i Is the initial weight of the gas holder when the capacity is zeroAn amount; m is a unit of b,i And rho is the linear density of the metal chain, and the weight is measured by the current gas tank containing weighing instrument.
4. The method for measuring the piston inclination value of a gas holder according to claim 2, wherein the piston height is also used to solve the volume of the gas holder as:
V＝π×R 2 ×H
wherein R is the inner radius of the side plate of the gas cabinet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211516007.XA CN115790532A (en) | 2022-11-30 | 2022-11-30 | Method for measuring inclination value of gas chamber piston |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211516007.XA CN115790532A (en) | 2022-11-30 | 2022-11-30 | Method for measuring inclination value of gas chamber piston |
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| CN115790532A true CN115790532A (en) | 2023-03-14 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006017492A (en) * | 2004-06-30 | 2006-01-19 | Nittetsu Hokkaido Control Systems Corp | Inclination measuring device of piston in holder |
| JP2013047612A (en) * | 2011-08-29 | 2013-03-07 | Jfe Steel Corp | Level gage for capacity variable storage vessel and storage amount calculation method for capacity variable storage vessel |
| CN104215291A (en) * | 2014-09-23 | 2014-12-17 | 成都安美固丹田新能源科技有限公司 | Method and system for real-time methane volume detection of inner membrane of membrane type methane storage cabinet |
| CN204101118U (en) * | 2014-09-23 | 2015-01-14 | 成都安美固丹田新能源科技有限公司 | Membrane type gas storage holder inner membrance real-time biogas capacity detection system |
| CN204202656U (en) * | 2014-11-27 | 2015-03-11 | 中冶华天工程技术有限公司 | Dry gas holder piston monitoring device |
| CN205403905U (en) * | 2016-02-29 | 2016-07-27 | 鞍山易兴自动化工程有限公司 | Dry -seal gasholder height indicator |
| CN107504954A (en) * | 2017-09-26 | 2017-12-22 | 中冶南方工程技术有限公司 | Rubber film sealed dry type gas chamber piston tilting value determining device and method |
| CN109681768A (en) * | 2018-12-28 | 2019-04-26 | 中冶南方工程技术有限公司 | A kind of constant-pressure type gas chamber |
-
2022
- 2022-11-30 CN CN202211516007.XA patent/CN115790532A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006017492A (en) * | 2004-06-30 | 2006-01-19 | Nittetsu Hokkaido Control Systems Corp | Inclination measuring device of piston in holder |
| JP2013047612A (en) * | 2011-08-29 | 2013-03-07 | Jfe Steel Corp | Level gage for capacity variable storage vessel and storage amount calculation method for capacity variable storage vessel |
| CN104215291A (en) * | 2014-09-23 | 2014-12-17 | 成都安美固丹田新能源科技有限公司 | Method and system for real-time methane volume detection of inner membrane of membrane type methane storage cabinet |
| CN204101118U (en) * | 2014-09-23 | 2015-01-14 | 成都安美固丹田新能源科技有限公司 | Membrane type gas storage holder inner membrance real-time biogas capacity detection system |
| CN204202656U (en) * | 2014-11-27 | 2015-03-11 | 中冶华天工程技术有限公司 | Dry gas holder piston monitoring device |
| CN205403905U (en) * | 2016-02-29 | 2016-07-27 | 鞍山易兴自动化工程有限公司 | Dry -seal gasholder height indicator |
| CN107504954A (en) * | 2017-09-26 | 2017-12-22 | 中冶南方工程技术有限公司 | Rubber film sealed dry type gas chamber piston tilting value determining device and method |
| CN109681768A (en) * | 2018-12-28 | 2019-04-26 | 中冶南方工程技术有限公司 | A kind of constant-pressure type gas chamber |
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