CN110864774A - Automatic calibration device for ultrasonic level meter and using method thereof - Google Patents
Automatic calibration device for ultrasonic level meter and using method thereof Download PDFInfo
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- CN110864774A CN110864774A CN201911355012.5A CN201911355012A CN110864774A CN 110864774 A CN110864774 A CN 110864774A CN 201911355012 A CN201911355012 A CN 201911355012A CN 110864774 A CN110864774 A CN 110864774A
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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Abstract
An automatic calibration device of an ultrasonic level meter comprises an underframe, a linear driving module, a fixed base station, a movable base station, a distance measuring sensor, a displacement sensor, a probe mounting base plate and an acoustic reflection plate; and the use method of the automatic calibration device for the ultrasonic level meter comprises the steps of under the first measuring range which does not exceed the effective stroke of the linear driving module and under the second measuring range which exceeds the effective stroke of the linear driving module. The device has the advantages of simple structure, convenient assembly, simple, convenient and quick use method, capability of meeting two calibration requirements of small range and large range, short calibration process time, high efficiency, simple and convenient operation, high measurement precision, good reproducibility and higher automation degree, and can be realized by mounting the probe mounting base plate on the fixed base station and matching with the acoustic reflection plate or the movable base station and matching with an external fixed dimension plane.
Description
Technical Field
The invention relates to the technical field of material level measurement, in particular to an automatic calibration device of an ultrasonic material level meter and a using method thereof.
Background
The ultrasonic level meter, as a non-contact level measuring instrument, has the characteristics of high measurement accuracy, simple and convenient installation, basic maintenance-free property and the like, and is commonly used for measuring the level of materials in various containers. The basic principle is that high-frequency pulse sound waves are emitted by an ultrasonic transducer (level probe), and the sound waves are reflected back to reflected waves when encountering the surface of the material and are received by the transducer again and converted into electric signals. The product of the speed of the sound wave and the sound wave transmission time is twice the sound wave transmission distance. The height of the material level in the actual container can be obtained by the difference between the fixed height of the ultrasonic material level meter and the transmission distance between the reference zero point (the bottom of the container) and the sound wave. An ultrasonic level meter as disclosed in patent document with application number CN201611069271.8 belongs to the field of liquid level measurement, and comprises an ultrasonic sensor, a sensor support and a measuring cylinder, wherein the ultrasonic sensor is fixed at the top of the sensor support, the measuring cylinder is fixed at the bottom of the sensor support, and the outer wall of the measuring cylinder is provided with a measuring cylinder opening. The ultrasonic level meter can ensure that the measuring signal for monitoring the liquid level height of the drilling fluid is accurate, and the measuring device is fast to install and disassemble and is convenient to clean and maintain; ultrasonic wave level meter support and auxiliary measuring instrument integration prevent undulant drilling fluid mud scale deposit in the auxiliary measuring section of thick bamboo, have solved ultrasonic wave level meter and measured inaccurate, the undulant problem of signal under the undulant liquid level environment, and the clearance of auxiliary measuring section of thick bamboo is maintained in convenient installation dismantlement mode, and the design structure has alleviateed the scale deposit degree in the auxiliary measuring section of thick bamboo.
As the measurement accuracy of the ultrasonic level meter is generally high, the minimum error of the ultrasonic level meter can reach the mm level for a small range of the ultrasonic level meter. The evaluation and calibration of the measurement results of the ultrasonic level gauge itself becomes a difficult problem. In common practice, for example, the distance between the wall surface and the ultrasonic level meter is measured by an ultrasonic wall surface test method to perform comparison verification, or the actual filling and draining of the container is performed by a second measurement means to perform verification. However, these methods are either low in accuracy as a standard measuring means, even lower than the accuracy of the ultrasonic level meter itself, or troublesome in actual operation, and the actual filling and draining of the container in the process system is limited by the system itself, which is not easy to realize.
Disclosure of Invention
One of the technical objectives of the present invention is to provide an automatic calibration device for an ultrasonic level meter, which solves the problems of the prior art, such as inconvenient calibration operation, low precision and poor reproducibility.
The specific technical scheme of the invention is as follows: an automatic calibration device of an ultrasonic level meter comprises an underframe, a linear driving module, a fixed base station, a movable base station, a distance measuring sensor, a displacement sensor, a probe mounting base plate and an acoustic reflection plate, wherein the linear driving module is connected to the underframe; the probe mounting base plate is connected to the fixed base station, the acoustic reflection plate is connected to the movable base station, and the probe mounting base plate is used for mounting an ultrasonic probe and the distance measuring sensor and enabling the ultrasonic probe and the distance measuring sensor to be vertically aligned to the acoustic reflection plate; or the probe mounting base plate is connected to the movable base station and is used for mounting the ultrasonic probe and the distance measuring sensor and enabling the ultrasonic probe and the distance measuring sensor to be vertically aligned to an external fixed plane; the distance measuring sensor is used for measuring the distance between the ultrasonic probe and the acoustic reflecting plate or the external fixed plane in real time, and the displacement sensor is used for measuring the displacement of the movable base station in real time.
Preferably, the displacement sensor is a rope displacement sensor, the rope displacement sensor is connected to the fixed base, and a free end of a rope of the rope displacement sensor is connected to the movable base.
Preferably, the distance measuring sensor is a laser distance measuring sensor, and the laser distance measuring sensor is connected to the probe mounting base plate.
Preferably, the acoustic reflector is provided with a laser target point, and the laser target point is used for the laser ranging sensor to vertically align.
Preferably, the probe mounting base plate is provided with a first connecting part for mounting the ultrasonic probe.
Preferably, the first connecting portion is an axial clamping groove.
Preferably, the probe mounting base plate is provided with a second connecting portion for mounting the distance measuring sensor.
Preferably, the second connecting portion is an axial clamping hole.
Preferably, the second connecting portion is a side connecting plate connected to the probe mounting base plate.
Preferably, the fixed base station and/or the movable base station are/is provided with a universal fixing frame, the universal fixing frame is provided with vertical inserting plate intervals and connected with tightening bolts, the vertical inserting plate intervals are used for being placed into the acoustic reflecting plate or the probe installation base plate, and the tightening bolts are used for tightly fixing the acoustic reflecting plate or the probe installation base plate in the vertical inserting plate intervals.
Preferably, the linear driving module is a synchronous belt sliding table module, and the sliding table is connected to a synchronous belt of the synchronous belt sliding table module and driven to reciprocate by the synchronous belt sliding table module.
Preferably, the linear driving module is a screw rod sliding table module, and the sliding table is connected to a screw rod of the screw rod sliding table module and driven by the screw rod sliding table module in a reciprocating mode.
Preferably, the linear driving module further comprises a limit sensor, and the limit sensor is used for monitoring the position of the sliding table and limiting the maximum moving range of the sliding table.
Another technical object of the present invention is to provide a method for using an automatic calibration device for an ultrasonic level meter, which is suitable for use in the automatic calibration device for an ultrasonic level meter, to perform a calibration operation with a high accuracy, including a step of not exceeding a first measurement range of an effective stroke of a linear driving module, wherein the step is performed in a manner of being simple and fast
1.1) connecting a probe mounting seat to a fixed base station, connecting an acoustic reflecting plate to a movable base station, mounting an ultrasonic probe and a distance measuring sensor on the probe mounting seat, aligning the ultrasonic probe and the distance measuring sensor to the acoustic reflecting plate, and fixedly connecting a displacement sensor to the fixed base station or the movable base station;
1.2) setting the measuring range of the ultrasonic level meter, and measuring and determining a full position and a vacant position relative to the ultrasonic probe on a stroke path of the linear driving module by using a distance measuring sensor, wherein the distance between the full position and the ultrasonic probe is L1, and the distance between the vacant position and the ultrasonic probe is L2;
1.3) selecting an initial position on the stroke path of the linear driving module, moving the sliding table to the initial position, measuring the distance L0 between the acoustic reflecting plate and the ultrasonic probe at the moment by using the ranging sensor, and establishing a zero point of a coordinate system;
1.4) moving the sliding table between the full position and the vacant position, measuring a displacement vector X of the acoustic reflecting plate by using a displacement sensor, calculating the distance Dx = L0+ X between the acoustic reflecting plate and the ultrasonic probe and the distance Lx = L2-Dx between the acoustic reflecting plate and the vacant position, and rechecking whether the Lx is consistent with the level measurement value of the ultrasonic probe;
1.5) if Lx is consistent with the level measurement value of the ultrasonic probe, finishing calibration; if Lx is different from the level measurement value of the ultrasonic probe, the ultrasonic level meter is corrected and the operation is restarted from the step 1.2;
the method also comprises the step of exceeding the effective stroke of the linear driving module under a second range
2.1) connecting a probe mounting seat to the movable base station, mounting an ultrasonic probe and a distance measuring sensor on the probe mounting seat, aligning the ultrasonic probe and the distance measuring sensor to an external fixed plane, and fixedly connecting a displacement sensor to the fixed base station or the movable base station;
2.2) setting the range of the ultrasonic level meter, moving the calibration device to any range section, wherein in the range section, a distance measurement sensor is used for measuring a high liquid level position and a low liquid level position which are selected on a stroke path of the linear driving module and are opposite to an external fixed plane, the distance between the high liquid level position and the external fixed plane is L1, the distance between the low liquid level position and the external fixed plane is L2, and the range section takes the range value that L2 is not larger than the ultrasonic level meter all the time as the standard;
2.3) selecting an initial position on the stroke path of the linear driving module, moving the sliding table to the initial position, measuring the distance L0 between the external fixed plane and the ultrasonic probe by using the ranging sensor, and establishing a zero point of a coordinate system;
2.4) moving the sliding table between the high liquid level position and the low liquid level position, measuring a displacement vector X of the ultrasonic probe by using a displacement sensor, calculating the distance Dx = L0+ X between the ultrasonic probe and an external fixed plane and the distance Lx = L2-Dx between the ultrasonic probe and the low liquid level position, and rechecking whether the Lx is consistent with the level measurement value of the ultrasonic probe;
2.5) if Lx is consistent with the level measurement value of the ultrasonic probe, finishing calibration; if Lx is different from the level measurement value of the ultrasonic probe, the ultrasonic level gauge is modified and the process is resumed starting from step 2.2.
The technical advantages of the invention are that the automatic calibration device of the ultrasonic level meter has simple structure and convenient assembly, the use method is very simple, convenient and quick, can meet two calibration requirements of small range and large range, can be realized by installing the probe installation seat plate on the fixed base station and matching with the acoustic reflection plate or installing the probe installation seat plate on the movable base station and matching with an external fixed dimension plane, has short calibration process time, high efficiency, simple operation, high measurement precision and reproducibility and higher automation degree, and is worth popularizing and using in the field.
Drawings
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention in use at a first range;
FIG. 3 is a schematic diagram of an embodiment of the present invention in use at a second range;
the names of the parts corresponding to the numbers in the figure are as follows: the device comprises a base frame 1, a linear driving module 2, a sliding table 21, a fixed base table 3, a movable base table 4, a probe mounting base plate 5, a first connecting part 51, a second connecting part 52, an acoustic reflecting plate 6, a displacement sensor 7, a distance measuring sensor 8, a universal fixing frame 9 and a jacking bolt 91.
Detailed Description
The invention will be further illustrated by means of specific embodiments in the following description with reference to the accompanying drawings:
see fig. 1, an embodiment of ultrasonic level meter automatic calibration device, including PLC control platform, still include chassis 1, linear drive module 2, fixed base station 3, activity base station 4, distance measuring sensor 8, displacement sensor 7, probe installation bedplate 5 and acoustic reflecting plate 6, linear drive module 2 is connected on chassis 1, activity base station 4 is connected on linear drive module 2 and is driven by it is reciprocal, fixed base station 3 is connected on chassis 1, fixed base station 3 is located on the extension line of the removal route of activity base station 4, fixed base station 3 abuts on the terminal side of leaning on linear drive module 2 in this embodiment, linear drive module 2, distance measuring sensor 8, displacement sensor 7 is all connected electrically and is controlled by PLC control platform.
The linear driving module 2 can also be a screw rod sliding table module in the prior art, and the sliding table 21 is connected to the screw rod of the screw rod sliding table module and driven by the screw rod to reciprocate, i.e. the driving mode of the screw rod replacing the synchronous belt is not described herein again. Nevertheless, compare in lead screw slip table module, hold-in range slip table module positioning accuracy is higher, and does not have lead screw slip table module itself and receive the problem of lead screw length restriction, has just also further avoided in the life-span, and the lead screw leads to the fact the error because of the deformation that bearing, long-term action lead to. In addition, the whole quality of hold-in range module slip table module is lighter, more agrees with in this scheme.
The probe mounting base plate 5 is used for mounting the ultrasonic probe 10 and vertically aligning the ultrasonic probe to the acoustic reflection plate 6, the displacement sensor 7 is used for measuring the displacement of the movable base 4 in real time, and the distance measuring sensor 8 is used for measuring the distance between the ultrasonic probe 10 and the acoustic reflection plate 6 or an external fixed plane in real time. The displacement sensor 7 is an incremental pull rope displacement sensor, the measuring range is 1500mm, the precision is three thousandths, the pull rope displacement sensor 7 is connected to the side surface of the fixed base station 3, the free end of a pull rope of the pull rope displacement sensor 7 is connected to the side surface of the movable base station 4, a hook is arranged on the side surface of the movable base station 4 so as to be connected with the free end of the pull rope, and the wire outlet height of the pull rope is consistent with the height of the hook; the distance measuring sensor 8 is a laser distance measuring sensor which is connected to the probe mounting base plate 5, and the emitting original point and the direction of the distance measuring sensor 8 are consistent with those of the ultrasonic probe 10 and are perpendicular to the acoustic reflection plate 6 or an external fixed plane.
The probe mounting base plate 5 is provided with a first connecting part 51 for mounting the ultrasonic probe 10 and a second connecting part 52 for mounting the distance measuring sensor 8, the first connecting part 51 is arranged as an axial clamping groove in the embodiment, the second connecting part 52 is a connecting side plate, the orientation of the ultrasonic probe 10 is parallel to the emitting direction of the laser distance measuring sensor and the wire outlet direction of the stay cord displacement sensor, and the origin of the laser distance measuring sensor is also consistent with the origin of the ultrasonic probe 10. Specifically, the axial clamping groove is an axially through U-shaped groove, and the groove width is 90mm, so as to adapt to the size of the common ultrasonic probe 10 in the market. Aviation aluminum materials are selected for the probe installation seat plate 5, the fixed base station 3 and the movable base station 4, and therefore the lightweight design of the whole equipment is achieved. As for the acoustic reflection plate 6, it is designed as a square plate with a size of 600 × 600, which is calculated based on the ultrasonic wave emission angle (typically around 12 °) and the effective stroke of the high-precision synchronous belt slide table module, and the calculation formula is the emission plate size DminAnd the value of theta is more than or equal to tan theta 1500mm, wherein theta is the emission angle of the ultrasonic level meter, the design calculation is based on the emission angle of 15 degrees, and a tripling value margin 400 is taken. The acoustic reflector is made of milky acrylic to ensure high strength and effective emission under light weight. The acoustic reflector 6 is provided with a laser target point, and the laser target point is used for enabling the laser probe 9 to be vertically aligned so that the plate surface of the acoustic reflector 6 is perpendicular to the emission direction of the laser ranging sensor, so that the mounting position of the laser ranging sensor is correct, and the probe mounting base plate 5 is also conveniently ensured to be vertically parallel to the acoustic reflector 6.
Further, for simple to operate and can dismantle the regulation and exchange, fixed base station 3 (does not include the base of its lower part), activity base station 4 can be for unanimous design pattern, like general mount 9 in the picture, be equipped with vertical picture peg interval and be connected with puller bolt 91 on the general mount 9, vertical picture peg interval is used for putting into acoustic reflecting plate 6 or probe installation bedplate 5, puller bolt 91 is used for pushing up acoustic reflecting plate 6 or probe installation bedplate 5 and tightly fixes in vertical picture peg interval, vertical picture peg interval and puller bolt cooperation make acoustic reflecting plate 6 and probe installation bedplate 5 vertical parallel, make ultrasonic probe 10, the perpendicular directive acoustic reflecting plate 6 of range finding sensor 8 more easily, unified measurement standard and make the measurement accurate.
Shown as two square plates. The same probe mounting base plate 5 and acoustic reflection plate 6 can also be designed to have similar structures for this purpose, so that the mounting manner is consistent. The probe installation seat plate 5 and the acoustic reflection plate 6 can also be two right-angle plates, only the probe installation seat plate 5 is provided with an axial clamping groove 101 and an installation interface 102, the probe installation seat plate 5, the bottom plate of the acoustic reflection plate 6 is flatly attached to the bottom plate of the fixed base station 3 or the movable base station 4, the probe installation seat plate 5 and the back of another vertical plate to which the acoustic reflection plate 6 belongs are connected with a screw rod, the screw rod penetrates through another vertical plate to which the fixed base station 3 or the movable base station 4 belongs and is connected with a screw sleeve to operate the forward movement and the backward movement of the probe installation seat plate 5 or the acoustic reflection plate 6, the position can be adjusted as required, the probe installation seat plate 5 and the bottom plate of the acoustic reflection plate 6.
The PLC control platform is provided with a human-computer interface touch screen based on PLC programming and used for setting various parameters in the calibration process, the control platform uses 220V mains supply, a large-capacity lithium battery pack is arranged in the control platform simultaneously to drive the control system and the linear driving module 2, and the PLC control platform can continue to work in a short time without an external power supply; in addition, the device is also provided with a 24VDC power output interface which can be used for driving external instruments such as a laser distance measuring sensor, a pull rope displacement sensor, an ultrasonic level meter and the like. The control platform and the calibration device adopt a split design and are connected through a bus cable. Based on the prior art, the human-computer interface of the PLC control platform provides a setting display and processing module for an initial position baffle probe distance L0 including a distance between an initial state probe and a movable baffle, "a full water level distance L1" of a full range distance, "an empty water level distance L2" of an empty tank distance, "a moving speed," a measured water level Lx, "and a distance measurement value Dx" between the ultrasonic probe 10 and the acoustic reflection plate, L0 can be measured by a laser ranging sensor, the PLC control platform is simultaneously provided with a button and a module for "correcting the initial position" for establishing a coordinate relation between the acoustic reflection plate 6 and the ultrasonic probe 10 based on L0, that is, zero point correction, and the "moving speed" can be adjusted between 0mm/s and 150 mm/s. In addition, the PLC control platform can also provide setting buttons and a processing module for multi-point setting, motor enabling, slow inching and fast inching, wherein the multi-point setting is to directly preset the moving distance of the movable rack and can set a uniform five-section percentage measuring range distance so as to realize automatic five-point comparison and calibration and improve the calibration working efficiency; the motor enable is used for controlling a servo motor power supply of the synchronous belt module; the slow inching and the fast inching are used for manually operating the driving motor of the linear driving module 2, and the reciprocating motion of the sliding table 21 is manually controlled to carry out manual comparison and calibration.
At a first range (i.e., a small range as commonly referred to) that does not exceed the effective stroke of the linear drive module, the method of use is as follows, as shown in reference to figure 2,
1. preparation before power-on
(1) Confirming that the assembly of the calibration device is completed and that a qualified external 220VAC power supply or a battery in the control platform is sufficient;
(2) installing a movable base table 4 on a sliding table 21 of a linear driving module 2, installing a fixed base table 3 on an underframe 1 (a base which is installed in a matched manner can be additionally arranged on the underframe 1) and abutting against the end side of the linear driving module 2, installing and fixing a probe installation base plate 5 on the fixed base table 3, and installing an acoustic reflection plate 6 on the movable base table 4;
(3) the relative position between the light spot of the acoustic reflector 6 and the laser target spot is irradiated by the laser of the laser ranging sensor 8, the probe mounting seat plate 5 is finely adjusted properly, and the connecting plate 10 of the probe mounting seat plate 5 is ensured to be vertical and parallel to the acoustic reflector 6;
(4) the ultrasonic probe 10 to be calibrated is arranged on the probe mounting seat plate 5, and power is supplied to the instrument through a control platform or other power supplies;
(5) the sliding table 21 is confirmed to be positioned between the limit sensors at the two ends of the linear slide rail of the synchronous belt sliding table module, so that the movable base table 4 and the ultrasonic probe 10 are always kept at a safe distance;
(6) the origin of the laser ranging sensor 8 is adjusted to a position that coincides with the origin of the ultrasonic probe 10 to be calibrated.
2. System setup
(1) After power-on, starting the motor, manually controlling the movable base station 4 through the touch screen according to the installation position and the measurement parameters of the ultrasonic probe 10, and checking whether the movable base station 4 works normally;
(2) setting the use range to be calibrated according to the use parameters of the ultrasonic probe 10;
(3) when the human-computer interface inputs 100% of material level, the distance between the probe and the object plane, namely L1, is reflected to the full position on the synchronous belt sliding table module, namely the position at the distance of 10L1 from the ultrasonic probe;
(4) when the human-computer interface inputs 0% of material level, the distance between the probe and the object plane, namely L2, is reflected to the full position on the synchronous belt sliding table module, namely the position at the distance of 10L2 from the ultrasonic probe;
(5) the movable base 4 is moved to an initial position (generally, a position close to the fixed base 3 side), the distance between the ultrasonic probe 10 and the acoustic reflection plate 6 at this time is measured by a laser ranging sensor to be L0, and L0 is input to the human-computer interface, so that a coordinate relation of the distance between the acoustic reflection plate and the ultrasonic probe 10 is established, and the initial position is corrected. In order to conveniently measure an accurate L0 value, the PLC control platform may be provided with an initialization button and a processing module for automatically moving the movable base 4 to a position about 280mm from the ultrasonic probe 10 (the distance may vary depending on the size and the installation position of the probe);
(6) after the above parameters are set, the sliding table 21 can be prepared to move in the range between the full position and the empty position, whether the real-time Lx displayed on the human-computer interface is the actual position value displayed by the ultrasonic level meter is checked, if not, the ultrasonic level meter is corrected, the parameters are checked, and the setting step is executed again.
Wherein Lx = L2-Dx, Dx = L0+ X, and X is a displacement vector of the ultrasonic probe 10 measured by the pull rope displacement sensor, when L1 is less than L0, if the slide table moves to the left relative to the initial position, the displacement vector X is a negative number, and if the slide table moves to the right relative to the initial position, the displacement vector X is a positive number; when L1 is more than or equal to L0, the sliding table always moves to the right relative to the initial position, the displacement vector X is a positive number, and the recording of each numerical value and the calculation process are realized by a PLC control platform.
3. Manual calibration
The sliding table 21 is moved by slow inching (which can be 1 mm/s) or fast inching (which can be 50 mm/s), the distance between the ultrasonic probe 10 and the acoustic reflection plate 6 is controlled to change the display of the human-computer interface measurement level Lx, and the calibration is completed by comparing the measured data of the ultrasonic probe 10.
4. Automatic calibration
And 5 calibration points of 0%, 25%, 50%, 75% and 100% in the range between the full position and the empty position are selected by default for the multi-point setting of the human-computer interface, the corresponding calibration points are selected, the distance between the ultrasonic probe 10 and the acoustic reflection plate 6 is controlled to change the display of the human-computer interface measurement level Lx, and the calibration is completed by comparing the measured data of the ultrasonic probe 10. In the actual human-computer interface, a step number selection and straight jump key and a processing module can be arranged, and the selection of a corresponding calibration point is confirmed as long as a corresponding number is selected or a straight jump step number is input, so that the method is easily realized in a PLC control platform based on the prior art. In addition, a left arrow button and a right arrow button and a processing module can be arranged to switch back and forth between 5 calibration points in sequence, the moving speed of the rack can be set on a human-computer interface, and the maximum allowable speed is 150 mm/s.
In addition, when it is necessary to deal with the second range (i.e. the large range in colloquial) exceeding the effective stroke of the linear driving module 2, the use method is different, and it can be referred to fig. 3.
In preparation for power-up, the difference is that the probe mounting base plate 5 is required to be connected to the movable base 4, the probe mounting base plate 5 is used to mount the ultrasonic probe 10 and vertically align it with an external fixed plane, such as a wall (shown in this embodiment) or other fixed-size plane, and the acoustic reflection plate 6 can be removed and not used.
During the system setting process, the difference is that the calibration device is firstly moved to any range section, in the range section, a distance sensor 8 is used for measuring a high liquid level position and a low liquid level position which are selected on a stroke path of the linear driving module and are opposite to an external fixed plane, the distance between the high liquid level position and the external fixed plane is L1, the distance between the low liquid level position and the external fixed plane is L2, and the range section takes the range value that L2 is not larger than the ultrasonic level meter all the time as the standard; then, an initial position is selected on the stroke path of the linear driving module, the sliding table is moved to the initial position, and the distance L0 between the external fixed plane and the ultrasonic probe 10 at the moment is measured by the distance measuring sensor 8, so as to establish a zero point of the coordinate system.
It should be noted that according to different calibration requirements, such as calibration accuracy required by a calibrator, sufficiency of calibration steps, etc., there may be a supplementary step, i.e., if the measured values of the ultrasonic probe 10 and Lx are checked to be consistent, it is still necessary to return to the step of setting the range of the ultrasonic level meter and moving the calibration device to any range section, and the steps are repeated until all ranges to which the calibration device is moved are covered by the entire range to be calibrated or the range required by the calibration, and the calibration operation is completely completed, of course, if the measured values of the ultrasonic probe 10 and Lx are not consistent, it is necessary to completely discard the calibration operation, when the measured values of the ultrasonic probe 10 and Lx are checked to be inconsistent, it is assumed that the range of the measured level meter is 4 meters, the probe distance between zero and the liquid level is 4.4 meters, the probe distance between the full liquid level and the full liquid level is 0.4 meters, the distance between the calibration device and the wall is changed by 4 segments, the change of the full range of the set value of the simulated liquid level, ①, the set value of the L =3, the simulated liquid level can be adjusted by a third set value of the simulated liquid level, the simulated liquid level change of the set value of L =3, the set value of the simulated liquid level can be adjusted by the set value of L =3, the range of the range.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. An ultrasonic level meter automatic calibration device is characterized in that: the device comprises an underframe (1), a linear driving module (2), a fixed base station (3), a movable base station (4), a displacement sensor (7), a distance measuring sensor (8), a probe mounting base plate (5) and an acoustic reflection plate (6), wherein the linear driving module (2) is connected to the underframe (1), the movable base station (4) is connected to the linear driving module (2) and driven by the linear driving module to reciprocate, the fixed base station (3) is connected to the underframe (1), and the fixed base station (3) is positioned on an extension line of a moving path of the movable base station (4);
the probe mounting base plate (5) is connected to the fixed base station (3), the acoustic reflection plate (6) is connected to the movable base station (4), and the probe mounting base plate (5) is used for mounting an ultrasonic probe and the ranging sensor (8) and enabling the ultrasonic probe and the ranging sensor to be vertically aligned with the acoustic reflection plate (6); or the probe mounting base plate (5) is connected to the movable base station (4), and the probe mounting base plate (5) is used for mounting an ultrasonic probe and the ranging sensor (8) and enabling the ultrasonic probe and the ranging sensor to be vertically aligned to an external fixed plane;
the distance measuring sensor (8) is used for measuring the distance between the ultrasonic probe and the acoustic reflecting plate (6) or an external fixed plane in real time, and the displacement sensor (7) is used for measuring the displacement of the movable base platform (4) in real time.
2. The automatic calibration device for an ultrasonic level gauge according to claim 1, wherein: the displacement sensor (7) is a stay cord displacement sensor, the stay cord displacement sensor is connected to the fixed base station (3)/the movable base station (4), and the free end of a stay cord of the stay cord displacement sensor is connected to the movable base station (4)/the fixed base station (3).
3. The automatic calibration device for an ultrasonic level gauge according to claim 1, wherein: the distance measuring sensor (8) is a laser distance measuring sensor, and the laser distance measuring sensor is connected to the probe mounting base plate (5).
4. An automatic calibration device for an ultrasonic level gauge as defined in claim 3, wherein: and the acoustic reflector (6) is provided with a laser target point, and the laser target point is used for the laser ranging sensor to vertically align.
5. The automatic calibration device for an ultrasonic level gauge according to claim 1, wherein: the probe installation seat plate (5) is provided with a first connecting part (51) for installing the ultrasonic probe.
6. The automatic calibration device for an ultrasonic level gauge according to claim 5, wherein: and a second connecting part (52) for mounting the distance measuring sensor (8) is arranged on the probe mounting base plate (5).
7. The automatic calibration device for an ultrasonic level gauge according to claim 1, wherein: fixed base station (3) and/or be equipped with general mount (9) on activity base station (4), be equipped with vertical picture peg interval on general mount (9) and be connected with puller bolt (91), vertical picture peg interval is used for putting into acoustic reflecting plate (6) or probe installation bedplate (5), puller bolt (91) be used for with acoustic reflecting plate (6) or probe installation bedplate (5) top is tightly fixed in the vertical picture peg interval.
8. The automatic calibration device for an ultrasonic level gauge according to claim 1, wherein: the linear driving module (2) is a synchronous belt sliding table module, and the sliding table (21) is connected to a synchronous belt of the synchronous belt sliding table module and driven to reciprocate.
9. An automatic calibration device for an ultrasonic level gauge as claimed in claim 6 or 7, wherein: and a limiting sensor is arranged on the linear driving module (2), and is used for monitoring the position of the sliding table (21) and limiting the maximum moving range of the sliding table.
10. Use of an automatic calibration device for an ultrasonic level meter, the automatic calibration device being suitable for use in an ultrasonic level meter according to any one of claims 1 to 9, wherein: comprises the step of measuring the effective stroke of the linear driving module under a first range
1.1) connecting a probe mounting seat to a fixed base station, connecting an acoustic reflecting plate to a movable base station, mounting an ultrasonic probe and a distance measuring sensor on the probe mounting seat, aligning the ultrasonic probe and the distance measuring sensor to the acoustic reflecting plate, and fixedly connecting a displacement sensor to the fixed base station or the movable base station;
1.2) setting the measuring range of the ultrasonic level meter, and measuring and determining a full position and a vacant position relative to the ultrasonic probe on a stroke path of the linear driving module by using a distance measuring sensor, wherein the distance between the full position and the ultrasonic probe is L1, and the distance between the vacant position and the ultrasonic probe is L2;
1.3) selecting an initial position on the stroke path of the linear driving module, moving the sliding table to the initial position, measuring the distance L0 between the acoustic reflecting plate and the ultrasonic probe at the moment by using the ranging sensor, and establishing a zero point of a coordinate system;
1.4) moving the sliding table between the full position and the vacant position, measuring a displacement vector X of the acoustic reflecting plate by using a displacement sensor, calculating the distance Dx = L0+ X between the acoustic reflecting plate and the ultrasonic probe and the distance Lx = L2-Dx between the acoustic reflecting plate and the vacant position, and rechecking whether the Lx is consistent with the level measurement value of the ultrasonic probe;
1.5) if Lx is consistent with the level measurement value of the ultrasonic probe, finishing calibration; if Lx is different from the level measurement value of the ultrasonic probe, the ultrasonic level meter is corrected and the operation is restarted from the step 1.2;
the method also comprises the step of exceeding the effective stroke of the linear driving module under a second range
2.1) connecting a probe mounting seat to the movable base station, mounting an ultrasonic probe and a distance measuring sensor on the probe mounting seat, aligning the ultrasonic probe and the distance measuring sensor to an external fixed plane, and fixedly connecting a displacement sensor to the fixed base station or the movable base station;
2.2) setting the range of the ultrasonic level meter, moving the calibration device to any range section, wherein in the range section, a distance measurement sensor is used for measuring a high liquid level position and a low liquid level position which are selected on a stroke path of the linear driving module and are opposite to an external fixed plane, the distance between the high liquid level position and the external fixed plane is L1, the distance between the low liquid level position and the external fixed plane is L2, and the range section takes the range value that L2 is not larger than the ultrasonic level meter all the time as the standard;
2.3) selecting an initial position on the stroke path of the linear driving module, moving the sliding table to the initial position, measuring the distance L0 between the external fixed plane and the ultrasonic probe by using the ranging sensor, and establishing a zero point of a coordinate system;
2.4) moving the sliding table between the high liquid level position and the low liquid level position, measuring a displacement vector X of the ultrasonic probe by using a displacement sensor, calculating the distance Dx = L0+ X between the ultrasonic probe and an external fixed plane and the distance Lx = L2-Dx between the ultrasonic probe and the low liquid level position, and rechecking whether the Lx is consistent with the level measurement value of the ultrasonic probe;
2.5) if Lx is consistent with the level measurement value of the ultrasonic probe, finishing calibration; if Lx is different from the level measurement value of the ultrasonic probe, the ultrasonic level gauge is modified and the process is resumed starting from step 2.2.
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