CN110733611B - Draft measuring device - Google Patents
Draft measuring device Download PDFInfo
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- CN110733611B CN110733611B CN201911000634.6A CN201911000634A CN110733611B CN 110733611 B CN110733611 B CN 110733611B CN 201911000634 A CN201911000634 A CN 201911000634A CN 110733611 B CN110733611 B CN 110733611B
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- liquid level
- glass tube
- magnetic
- floater
- magnetic floater
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/12—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for indicating draught or load
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/02—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention relates to a draft measuring device, which comprises an upper magnetic floater, a lower magnetic floater, a glass tube liquid level meter, two liquid level transmitters and a liquid level display device, wherein the upper magnetic floater, the lower magnetic floater, the glass tube liquid level meter, the two liquid level transmitters and the liquid level display device are arranged on the upper magnetic floater; the upper magnetic floater and the lower magnetic floater are communicated with the glass tube liquid level meter; each magnetic floater and glass tube liquid level meter comprises a front cavity and a rear cavity, the bottoms of the front cavity and the rear cavity are mutually communicated, the glass tube liquid level meter is arranged in the front cavity, and the magnetic floater is arranged in the rear cavity; the front cavity and the rear cavity are communicated with seawater outside the ship body to form a communicating vessel, and the seawater level in the front cavity and the rear cavity is the same as the seawater level outside the ship body; the two liquid level transmitters are respectively arranged at the bottom ends of the rear cavities of the upper magnetic floater, the lower magnetic floater and the glass tube liquid level meter, the magnetic floater transmits a magnetic signal to the liquid level transmitters through the shell of the rear cavity, and the liquid level transmitters convert the magnetic signal into an electric signal and transmit the electric signal to the liquid level display device. The invention can realize real-time stable continuous measurement of the draught of the ship body and can directly observe the height of the sea water level.
Description
Technical Field
The invention relates to the technical field of damage sinking resistance and attitude balance monitoring, in particular to a ship draft measuring device.
Background
At present, most of draft measurement systems applied in the field of domestic ships adopt piezoelectric draft measurement sensors, the sensors can accurately measure the draft of a ship body when the ship is in an anchoring state in a calm sea area, but the piezoelectric draft measurement sensors can be influenced by severe changes of surrounding seawater pressure when sea waves are large or the ship is in a running state, and the draft of the ship body cannot be accurately read in real time. The draft data is an important parameter of a ship damage sinking resistance and attitude balance system, so that the traditional piezoelectric type draft measurement sensor has great limitation, cannot meet the use requirement of the ship on draft real-time measurement, and can bring certain hidden danger to the running safety of the ship.
Disclosure of Invention
The invention aims to solve the technical problem that the existing ship draft measuring system adopting a piezoelectric sensor has a large measuring error in a ship dynamic environment, and provides a draft measuring device which can realize real-time accurate dynamic measurement of the draft of a ship body.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a draft measuring device comprises an upper magnetic floater, a lower magnetic floater, a glass tube liquid level meter, two liquid level transmitters and a liquid level display device; the upper magnetic floater and the lower magnetic floater are communicated with the glass tube liquid level meter; each magnetic floater and glass tube liquid level meter comprises a front cavity and a rear cavity, the bottoms of the front cavity and the rear cavity are mutually communicated, the glass tube liquid level meter is arranged in the front cavity, and the magnetic floater is arranged in the rear cavity; the front cavity and the rear cavity are communicated with seawater outside the ship body to form a communicating vessel, and the seawater level in the front cavity and the rear cavity is the same as the seawater level outside the ship body; the two liquid level transmitters are respectively arranged at the bottom ends of the rear cavities of the upper magnetic floater, the lower magnetic floater and the glass tube liquid level meter, the magnetic floater transmits magnetic force signals to the liquid level transmitters through the shell of the rear cavity, and the liquid level transmitters convert the magnetic force signals into electric signals and transmit the electric signals to the liquid level display device.
In the scheme, the upper magnetic floater and the lower magnetic floater and the glass tube liquid level meter are respectively positioned above and below a single-layer deck of the ship, the two magnetic floaters and the glass tube liquid level meters are communicated with each other through a pipeline and a flange, and the pipeline and the flange penetrate through the deck.
In the above scheme, draft measuring device still includes pressure sensor, pressure sensor sets up in the bottom that is located the magnetic float of below and glass pipe level gauge, pressure sensor sends the hydraulic signal who surveys to liquid level display device, liquid level display device can read pressure sensor's data is calculated and is shown.
In the scheme, the magnetic floater and the glass tube liquid level meter which are positioned below are communicated with seawater outside the ship body through the sea chest, and a section of flow channel which is small in diameter and is bent is adopted between the seawater inlet stop valve and the flanges of the magnetic floater and the glass tube liquid level meter, so that mechanical damping for outboard waves is formed, and liquid fluctuation in the flow channel is reduced.
In the above scheme, liquid level display device receives the signal of telecommunication that comes from two liquid level transmitters, calculates the signal of telecommunication and converts actual draft data into, and liquid level display device adopts many sampling points compensation, filtering compensation algorithm to handle liquid level height data in the runner, realizes secondary filter's function to guarantee the stability and the reliability of data, finally show on the display screen.
In the scheme, the glass tube liquid level meter adopts a bicolor quartz glass tube liquid level meter, utilizes the refraction optical principle of natural light in liquid, and makes the glass tube green when seawater exists in the glass tube and red when seawater does not exist in the glass tube by means of red and green color filtering glass.
In the scheme, a magnetic turnover plate of the traditional magnetic floater liquid level meter is not required to be arranged in the rear cavity.
In the scheme, all components of the draft measuring device are made of seawater corrosion resistant materials.
The invention has the beneficial effects that:
1. the draft measuring device can realize real-time stable continuous measurement of the draft of the ship body and can directly observe the height of the seawater level. The magnetic floater and the glass tube liquid level meter of the draft measuring device are composed of a front glass tube cavity (front cavity) and a rear cavity (rear cavity) which contains the magnetic floater at the rear part, and are jointly connected with the outside of the ship body through a flange and a pipeline to form a communicating vessel, and the liquid level in the two cavities is as high as the sea water level outside the ship body. Draft depth data can be directly read through a front glass tube liquid level meter; in addition, the magnetic floater keeps consistent with the sea water level, transmits a magnetic signal to a liquid level transmitter outside the cavity through the cavity shell, and converts the received magnetic signal into an electric signal and transmits the electric signal to a liquid level display device. By adopting the magnetic floater and the glass tube liquid level meter, the digital reading of the draft and the mechanical direct reading of the liquid level can be realized.
2. The liquid level display device of the draft measuring device receives the electric signal from the liquid level transmitter, calculates the electric signal and converts the electric signal into actual draft data. The magnetic floater and the glass tube liquid level meter adopt a flow channel with smaller diameter and bending to realize mechanical damping of outboard waves and reduce liquid fluctuation in the flow channel, and the liquid level display device adopts algorithms such as multi-sampling point compensation and filter compensation to process liquid level height data in the flow channel, so that the function of secondary filtering is realized, the stability and reliability of the data are ensured, and finally the data are displayed on a display screen. The high-precision sensor (the liquid level transmitter and the pressure sensor) is adopted to realize the +/-10 mm measurement precision, and the device has the characteristics of wide application range and strong practicability.
3. The draft measuring device is also provided with a pressure sensor in signal connection with the liquid level display device, and when the draft is in the range of the blind areas (the butt joint position of the liquid level meter and the armor plate penetrating position) measured by the magnetic floater and the glass tube liquid level meter, the liquid level display device carries out compensation calculation on the draft data in the blind areas by collecting the signals of the pressure sensor arranged at the bottoms of the magnetic floater and the glass tube liquid level meter so as to display the non-blind areas.
4. The draft measuring device is used for measuring the draft of ships and warships, and is used as a supplementary means of a piezoelectric type measuring mode. And can upload digital draft signals to the damage management monitoring system.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the overall construction of a draft measuring device of the present invention;
FIG. 2 is a front view of the underlying magnetic float and glass tube level gauge of the present invention;
FIG. 3 is a front view of the magnetic float and glass tube level gauge of the present invention positioned above;
FIG. 4 is a side view of the magnetic float and glass tube level gauge of FIG. 3 positioned above;
FIG. 5 is a schematic view of a liquid level display of the draft measuring device of the present invention.
In the figure: 10. a magnetic float and a glass tube level gauge; 11. a front cavity; 111. a glass tube level gauge; 12. a rear cavity; 121. a magnetic float; 20. a liquid level transmitter; 30. a pressure sensor; 40. a liquid level display device.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the draft measuring device according to a preferred embodiment of the present invention includes two magnetic floats and a glass tube level gauge 10, two level transmitters 20, a pressure sensor 30 and a level display device 40. Because the total length of draft level that the vessel needs to measure is over the height of the vessel's single deck layer, the single magnetic float and glass tube level gauge 10 cannot fully measure the full level height required. Therefore, a complete draft measuring device is provided with an upper magnetic floater and a lower magnetic floater and a glass tube liquid level meter 10, the upper magnetic floater and the lower magnetic floater and the glass tube liquid level meter 10 are respectively positioned above and below a single-layer deck of a ship, the two magnetic floaters and the glass tube liquid level meters 10 are mutually communicated through a pipeline and a flange, and the pipeline and the flange penetrate through the deck.
Further optimizing, the magnetic floater and the glass tube liquid level meter 10 which are positioned below are communicated with seawater outside the ship body through a sea chest, and a section of flow channel which is small in diameter and is bent is adopted between the seawater inlet stop valve and the flanges of the magnetic floater and the glass tube liquid level meter 10, so that mechanical damping for outboard waves is formed, and liquid fluctuation in the flow channel is reduced.
As shown in fig. 2 to 4, each magnetic float and glass tube level gauge 10 includes a front chamber 11 and a rear chamber 12 whose bottoms are communicated with each other, a glass tube level gauge 111 is provided in the front chamber 11, and a magnetic float 121 is provided in the rear chamber 12. The front cavity 11 and the rear cavity 12 are communicated with seawater outside the ship body to form a communicating vessel, and the seawater levels in the front cavity 11 and the rear cavity 12 are the same as the seawater level outside the ship body. The two liquid level transmitters 20 are respectively arranged at the bottom ends of the rear cavity 12 of the upper magnetic floater, the lower magnetic floater and the glass tube liquid level meter 10, the magnetic floater 121 transmits a magnetic signal to the liquid level transmitter 20 through the shell of the rear cavity 12, and the liquid level transmitter 20 converts the magnetic signal into an electric signal and transmits the electric signal to the liquid level display device 40. The level display device 40 receives electrical signals from the two level transmitters 20, calculates the electrical signals and converts them into actual draft data.
Because the pipeline between the upper magnetic floater and the lower magnetic floater and the glass tube liquid level meter 10 needs to penetrate through the deck, a blind area exists during measurement, the blind area is compensated through the pressure sensor 30, namely when the liquid level is just in the pipeline between the upper magnetic floater and the lower magnetic floater and the glass tube liquid level meter 10, the liquid level cannot be directly read through the front cavity 11, and at the moment, the liquid level height is confirmed through the value of the pressure sensor 30. The pressure sensor 30 is disposed at the bottom of the magnetic float and glass tube level gauge 10 located below. The pressure sensor 30 transmits the measured hydraulic signal to the liquid level display device 40, and the liquid level display device 40 can read the data of the pressure sensor 30, calculate and display the data, so that the non-blind area real-time measurement and display of the draft data are realized.
The user can directly read the draught depth of the ship body through the scale corresponding to the liquid level in the glass tube liquid level meter 111. In order to facilitate the observation of the liquid level, the glass tube liquid level meter 111 adopts a bicolor quartz glass tube liquid level meter, utilizes the refraction optical principle of natural light in liquid, and utilizes red-green glass for filtering by color to ensure that the glass tube is green when seawater exists in the glass tube and red when seawater does not exist in the glass tube, thereby enhancing the visibility of liquid level observation. The indication precision after calibration can reach +/-10 mm.
In addition, the magnetic floater 121 can rise and fall along with the liquid level in the cavity, and is also consistent with the sea water level outside the ship body. The magnetic floater 121 transmits a magnetic signal to the liquid level transmitter 20 at the end of the cavity through the shell of the rear cavity 12, and the liquid level transmitter 20 converts the magnetic signal into an electric signal of 4-20mA and transmits the electric signal to the liquid level display device 40. The liquid level display device 40 calculates the collected electric signals of the two liquid level transmitters 20 and processes the height data of the liquid level in the flow channel by using a multi-sampling point compensation and filtering compensation algorithm, so that the function of secondary filtering is realized, the stability and the reliability of the data are ensured, and finally the data are displayed on a display screen.
When the draft is in the measurement blind area of the upper magnetic floater, the lower magnetic floater and the glass tube liquid level meter 10, the liquid level display device 40 can read the data of the pressure sensor 30 fixed at the bottom of the cavity and calculate and display the data, so that the non-blind area real-time measurement and display of the draft data are realized.
Further, in the present embodiment, a magnetic flap is not required to be disposed in the rear cavity 12. The traditional magnetic floater liquid level meter is a magnetic turning plate liquid level meter, the floater position in the cavity can float up and down along with the liquid level of external seawater, the material in the floater is permanent magnetic steel, magnetism is transmitted to a magnetic turning plate (namely a magnetic turning column indicator which consists of small magnetic turning columns with the number corresponding to scales) fixed in the cavity through the magnetic coupling principle, when the liquid level rises, the corresponding turning column turns to be red from white for 180 degrees, and when the liquid level falls, the floater passes through again, the turning column turns to be white from red, so that the scale display is realized. Because the magnetic turning column has limited service life and lower reliability, and the draft measuring device of the invention integrates the glass tube liquid level meter, the magnetic turning plate required by the traditional magnetic floater liquid level meter is not required to be configured. Only the magnetic force signal of the floating ball needs to be converted into an electric signal of 4-20mA by the liquid level transmitter fixed at the bottom end of each liquid level meter and then output to the display device.
Further optimization, in the embodiment, aiming at the characteristic that the liquid level meter is easily corroded by seawater when used in a seawater environment, all components of the draft measuring device are made of materials with good seawater corrosion resistance. The magnetic floater, the glass tube liquid level meter 10 body and the connecting flange adopt a process of lining PTFE with 316L stainless steel material, complete isolation of metal material and seawater is realized under the condition of ensuring the strength of the device, and the corrosion resistance of the device is enhanced. In addition, the body of the liquid level display device 40 is made of cold-rolled steel plate, and other accessories meet the requirements of corrosion prevention and leakage prevention in high air humidity, salt fog and mould environments.
The draft measurement device can realize real-time non-blind area measurement on draft data, improves the reliability and stability of the draft data through mechanical damping and multi-point sampling and data compensation algorithm processing, and has the characteristics of wide application range and strong practicability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A draft measuring device is characterized by comprising an upper magnetic floater, a lower magnetic floater, a glass tube liquid level meter, two liquid level transmitters and a liquid level display device; the upper magnetic floater and the lower magnetic floater are communicated with the glass tube liquid level meter; each magnetic floater and glass tube liquid level meter comprises a front cavity and a rear cavity, the bottoms of the front cavity and the rear cavity are mutually communicated, the glass tube liquid level meter is arranged in the front cavity, and the magnetic floater is arranged in the rear cavity; the front cavity and the rear cavity are communicated with seawater outside the ship body to form a communicating vessel, and the seawater level in the front cavity and the rear cavity is the same as the seawater level outside the ship body; the two liquid level transmitters are respectively arranged at the bottom ends of the rear cavity of the upper magnetic floater, the lower magnetic floater and the glass tube liquid level meter, the magnetic floaters transmit magnetic force signals to the liquid level transmitters through the shell of the rear cavity, and the liquid level transmitters convert the magnetic force signals into electric signals and transmit the electric signals to the liquid level display device;
the upper magnetic floater, the lower magnetic floater and the glass tube liquid level meter are respectively positioned above and below a single-layer deck of the ship, the two magnetic floaters and the glass tube liquid level meters are mutually communicated through a pipeline and a flange, and the pipeline and the flange penetrate through the deck;
draft measuring device still includes pressure sensor, pressure sensor sets up in the bottom that is located the magnetic float of below and glass pipe level gauge, pressure sensor sends the hydraulic signal who records to liquid level display device, liquid level display device can read pressure sensor's data is calculated and is shown.
2. The draft measurement device according to claim 1, wherein the magnetic float and the glass tube level gauge located below are communicated with the seawater outside the hull through a sea chest, and a section of flow channel with a small diameter and a curve is adopted between the seawater inlet stop valve and the flanges of the magnetic float and the glass tube level gauge to form mechanical damping to the waves outside the glare and reduce the fluctuation of the liquid in the flow channel.
3. The draft measurement device according to claim 2, wherein the liquid level display device receives electrical signals from the two liquid level transmitters, calculates the electrical signals and converts the electrical signals into actual draft data, and the liquid level display device processes the height data of the liquid level in the flow channel by using a multi-sampling-point compensation and filtering compensation algorithm, so that a secondary filtering function is realized, stability and reliability of the data are ensured, and finally the data are displayed on a display screen.
4. The draft measurement device according to claim 1, wherein said glass tube level gauge is a bicolor quartz glass tube level gauge, which utilizes the optical principle of refraction of natural light in liquid and red and green glass with color filter to make the glass tube appear green when seawater is present and red when seawater is absent.
5. The draft measuring device according to claim 1, wherein a magnetic flap of a conventional magnetic float level gauge is not required in the rear cavity.
6. The draft measuring device according to claim 1, wherein all components of said draft measuring device are made of seawater corrosion resistant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911000634.6A CN110733611B (en) | 2019-10-21 | 2019-10-21 | Draft measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911000634.6A CN110733611B (en) | 2019-10-21 | 2019-10-21 | Draft measuring device |
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| CN110733611A CN110733611A (en) | 2020-01-31 |
| CN110733611B true CN110733611B (en) | 2021-04-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486777B (en) * | 2020-04-24 | 2022-09-02 | 长江三峡通航管理局 | Detection device and method for accurate butt joint of ship lift chamber and lock head |
| CN112067076A (en) * | 2020-07-21 | 2020-12-11 | 沪东中华造船(集团)有限公司 | Non-blind area isolated liquid level detection device and liquid level measurement method for ship liquid cargo tank |
| CN111806637A (en) * | 2020-07-24 | 2020-10-23 | 上海外高桥造船有限公司 | Ocean platform and draft reading method thereof |
| CN113581399B (en) * | 2021-08-05 | 2024-04-26 | 中国舰船研究设计中心 | Ship draft and sea water density measurement system |
| CN117091674B (en) * | 2023-10-20 | 2024-01-30 | 磐石重工(青岛)股份有限公司 | Liquid level measuring device for pressure container |
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| CN208751669U (en) * | 2018-10-12 | 2019-04-16 | 吉林省隆华测控股份有限公司 | Boiler high-precision magnetic float level meter |
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| GB1333994A (en) * | 1971-06-16 | 1973-10-17 | Iturribarria Miguel F A De | Marine levelmeter |
| JP2003137178A (en) * | 2001-08-23 | 2003-05-14 | New Japan Surveyors & Sworn Measurers Association | Draught detection device |
| CN203231799U (en) * | 2013-05-30 | 2013-10-09 | 山东利丰达生物科技有限公司 | Level meter for chemical spherical material storage tank |
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