A ship radar liquid level meter measuring test device

Abstract

This application relates to the field of ship commissioning equipment technology, and in particular to a ship radar level gauge measurement and testing device. It includes: a waveguide; a measuring instrument, disposed within the waveguide and slidably connected to it; a limiting member installed on the side wall of the waveguide to restrict the position of the measuring instrument within the waveguide; a radar installed in the waveguide along its length, with the transmitting end of the radar at least partially overlapping the measuring instrument; and a reflecting surface disposed at the end of the measuring instrument near the radar to reflect the emitted wave from the radar. This device can improve the measurement and testing efficiency and accuracy of radar level gauges.

Description

Technical Field

[0001] This application relates to the field of ship commissioning equipment technology, and in particular to a ship radar level gauge measurement and testing device. Background Technology

[0002] In shipbuilding and maintenance, the accuracy verification of liquid level measurement equipment is crucial to ensuring safe ship operation and accurate cargo measurement. Radar level gauges, due to their non-contact measurement and adaptability, are widely used in liquid tank level monitoring systems on various types of ships. Currently, the standard procedure for on-site measurement accuracy testing of radar level gauges after installation is as follows: a flexible water bag is placed at the bottom of the radar waveguide, and then clean water is injected into the bag. By manually adjusting the water level inside the bag, different liquid level conditions are simulated. The echo signal from the radar level gauge is then compared with the measured water level to verify the measurement accuracy.

[0003] However, in the aforementioned testing methods, the lower end of the radar waveguide is usually equipped with a fixing code to enhance structural stability. The presence of this fixing code hinders the effective installation of the water bag. If the fixing code is forcibly removed, the fasteners that have already been coated with topcoat must be disassembled. This operation is not only difficult to carry out and prone to damaging the coating protection system, but also introduces additional risks of hull structural damage and rework costs. At the same time, the test water source needs to be transported from outside the cabin to the work point inside the cabin via buckets or fire hoses over long distances. The water filling process is labor-intensive and time-consuming, especially for deep cabin conditions, where the water supply efficiency is significantly reduced. The water bag itself has a limited height, and its adjustable water level range is narrow, making it difficult to cover the full measurement range of the radar level gauge. This results in the test data not being able to fully reflect the true performance of the instrument under extreme high and low level conditions, introducing a large measurement uncertainty. In summary, existing testing methods relying on water bags have inherent defects such as cumbersome operation procedures, poor adaptability to operating conditions, low testing efficiency, and insufficient calibration accuracy, making it difficult to meet the needs of modern shipbuilding efficiency and high reliability testing. Summary of the Invention

[0004] Therefore, it is necessary to provide a ship radar level gauge measurement and testing device that can improve the measurement and testing efficiency and accuracy of radar level gauges.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution: A ship radar level gauge measurement and testing device, comprising: waveguide; The measuring instrument is disposed inside the waveguide and is slidably connected to the waveguide. A limiting component is installed on the side wall of the waveguide to restrict the position of the measuring instrument inside the waveguide; A radar is mounted on the waveguide, and along the length of the waveguide, the generating end of the radar at least partially coincides with the measuring instrument. A reflective surface is disposed at one end of the measuring instrument near the radar to reflect the transmitted waves emitted by the radar.

[0006] Understandably, because the measuring device is slidably connected to the waveguide and the limiting component can lock it in any axial position inside the waveguide, combined with the efficient reflection of radar waves by the reflector, the operator can simulate the continuous liquid level height from zero liquid level at the bottom of the tank to full liquid level at the top of the tank. Especially when the radar transmitter and the measuring device are at least partially overlapped, the extreme short-range (zero position) working condition can be accurately simulated, thus completely covering the entire measurement range of the level gauge. The limiting component externally limits the measuring device from the side wall of the waveguide, and the operator can complete the positioning and adjustment of the measuring device without entering the tank or disassembling the waveguide. This completely eliminates the cumbersome procedures of adding water, draining water, and cleaning the tank in the traditional water bag method, and greatly shortens the single test cycle.

[0007] In one embodiment, the limiting member is disposed on the outside of the waveguide, and the limiting member is attracted to the measuring device.

[0008] In one embodiment, two adsorption elements are provided opposite to the sidewall of the measuring device, and the line connecting the two adsorption elements is arranged along the width direction of the measuring device.

[0009] In one embodiment, the limiting member further includes a connecting ring, which is coaxially arranged with the waveguide and fixedly connected to the adsorption member.

[0010] In one embodiment, the reflective surface is positioned perpendicular to the radar transmitted wave.

[0011] In one embodiment, the outer wall of the measuring device abuts against the inner wall of the waveguide.

[0012] In one embodiment, the limiting member is provided with an indicator line, the indicator line being at the same height as the reflective surface.

[0013] In one embodiment, the outer wall of the waveguide is provided with a sliding surface relative to the limiting member, and the side wall of the sliding surface abuts against the side wall of the limiting member.

[0014] In one embodiment, the sliding surface is a planar structure.

[0015] In one embodiment, the outer wall of the waveguide is provided with scale lines.

[0016] Compared with existing technologies, a new ship radar level gauge measurement test device features a sliding connection between the measuring device and the waveguide, with a limiting component that can lock it at any axial position within the waveguide. Combined with the efficient reflection of radar waves by the reflector, operators can simulate the continuous liquid level height from zero level at the bottom of the tank to full level at the top. Especially when the radar transmitter and the measuring device are at least partially overlapped, it can accurately simulate extreme short-range (zero-level) conditions, thus fully covering the entire measurement range of the level gauge. The limiting component externally limits the measuring device from the side wall of the waveguide, allowing operators to complete the positioning and adjustment of the measuring device without entering the tank or disassembling the waveguide. This completely eliminates the cumbersome procedures of adding water, draining water, and cleaning the tank in the traditional water bag method, significantly shortening the single test cycle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a ship radar level gauge measurement and testing device provided in this application.

[0019] The component labels are as follows: 1. Waveguide; 2. Measuring instrument; 3. Limiting component; 4. Radar; 5. Reflecting surface. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0025] In shipbuilding and maintenance, the accuracy verification of liquid level measurement equipment is crucial to ensuring safe ship operation and accurate cargo measurement. Radar level gauges, due to their non-contact measurement and adaptability, are widely used in liquid tank level monitoring systems on various types of ships. Currently, the standard procedure for on-site measurement accuracy testing of radar level gauges after installation is as follows: a flexible water bag is placed at the bottom of the radar waveguide, and then clean water is injected into the bag. By manually adjusting the water level inside the bag, different liquid level conditions are simulated. The echo signal from the radar level gauge is then compared with the measured water level to verify the measurement accuracy.

[0026] However, in the aforementioned testing methods, the lower end of the radar waveguide is usually equipped with a fixing code to enhance structural stability. The presence of this fixing code hinders the effective installation of the water bag. If the fixing code is forcibly removed, the fasteners that have already been coated with topcoat must be disassembled. This operation is not only difficult to carry out and prone to damaging the coating protection system, but also introduces additional risks of hull structural damage and rework costs. At the same time, the test water source needs to be transported from outside the cabin to the work point inside the cabin via buckets or fire hoses over long distances. The water filling process is labor-intensive and time-consuming, especially for deep cabin conditions, where the water supply efficiency is significantly reduced. The water bag itself has a limited height, and its adjustable water level range is narrow, making it difficult to cover the full measurement range of the radar level gauge. This results in the test data not being able to fully reflect the true performance of the instrument under extreme high and low level conditions, introducing a large measurement uncertainty. In summary, existing testing methods relying on water bags have inherent defects such as cumbersome operation procedures, poor adaptability to operating conditions, low testing efficiency, and insufficient calibration accuracy, making it difficult to meet the needs of modern shipbuilding efficiency and high reliability testing.

[0027] Therefore, it is necessary to provide a ship radar level gauge measurement and testing device that can improve the measurement and testing efficiency and accuracy of radar level gauges.

[0028] Please see Figure 1 This application provides a test device for measuring a liquid level gauge using a marine radar 4, comprising a waveguide 1, a radar 4, and a measuring instrument 2. The waveguide 1 serves as the framework and signal transmission channel of the device, and its overall structure is a hollow cylindrical tube. The inner diameter of the waveguide 1 needs to be reasonably set according to the operating frequency and range requirements of the radar 4, typically between 50 mm and 150 mm. The inner wall surface is precision machined or polished to minimize scattering loss and clutter interference during electromagnetic wave propagation within the tube.

[0029] The length of waveguide 1 is determined based on the actual height of the liquid tank being tested. It generally covers the entire measurement range from the bottom to the top of the tank, with typical lengths of 5 meters, 10 meters, and 20 meters to meet the testing requirements of different ship types and compartments.

[0030] One end, the upper or top end, of the waveguide 1 is the mounting end for radar 4. This end is equipped with a dedicated connecting flange or threaded interface for fixing radar 4 in place. Radar 4 is the core signal transceiver unit of this device. Its specific type can be either a frequency-modulated continuous wave radar 4 or a pulse radar 4, to balance measurement resolution and penetration capability. Both the transmitting and receiving ends of radar 4 are oriented within the cavity of the waveguide 1, and are typically integrated into the front end face of the radar 4 probe. The transmitting end generates and transmits high-frequency electromagnetic waves downwards along the axial direction of the waveguide 1, i.e., the transmitted wave. The receiving end captures the reflected echoes transmitted back through the liquid surface or reflecting surface 5. Radar 4 and waveguide 1 are connected in an airtight and watertight manner through sealing rings or O-rings to prevent moisture or condensation from entering the internal circuit modules of radar 4, ensuring long-term stable operation of the equipment in humid environments.

[0031] A measuring device 2, which can slide freely along the axial direction, is installed in the internal cavity of the waveguide 1. The overall shape of the measuring device 2 is designed as a cylindrical or disc-shaped slider structure that matches the inner diameter of the waveguide 1. The outer peripheral wall of the measuring device 2 abuts against or maintains a small gap with the inner wall of the waveguide 1, usually 0.5 mm to 2 mm. This ensures that the measuring device 2 can slide smoothly without jamming, and also avoids radial wobble or tilting of the measuring device 2 during movement due to excessive gap, which would affect the spatial attitude of the reflecting surface 5 and the stability of the reflected signal.

[0032] To achieve a sliding connection between the measuring device 2 and the waveguide 1, in one embodiment, the measuring device 2 has several wear-resistant guide rings embedded in its outer wall. These guide rings are made of low-friction materials such as polytetrafluoroethylene or nylon. The outer edge of the guide rings slides against the inner wall of the waveguide 1, effectively reducing sliding resistance and preventing wear and scratches caused by direct metal-to-metal contact. In another embodiment, the inner wall of the waveguide 1 has one or more guide grooves along the axial direction. The corresponding measuring device 2 has protruding keys or balls that mate with the guide grooves on its outer periphery, thus limiting the measuring device 2 to translation only along the axial direction and preventing rotation around the axis, ensuring that the azimuth angle of the reflecting surface 5 remains constant.

[0033] The sliding connection structure between the measuring device 2 and the waveguide 1 allows the measuring device 2 to reciprocate along the axial direction of the waveguide 1 under external force, thereby flexibly adjusting the longitudinal distance between the measuring device 2 and the radar 4. This distance adjustment range covers a continuous interval from the near end of the radar 4 to the bottom of the waveguide 1, thus simulating the echo response of the radar 4 level gauge under different liquid levels in actual working conditions. To facilitate remote or local control of the measuring device 2's position, the measuring device 2 can also be equipped with a traction interface for connecting a wire rope, nylon rope, or magnetic coupling traction mechanism, enabling precise positioning of the measuring device 2 within the waveguide 1 via manual or electric winch. In a preferred embodiment, the measuring device 2 can also be linked with an external scale or displacement sensor to read the precise distance of the measuring device 2 relative to the radar 4 in real time, thereby improving the accuracy of the measurement data.

[0034] A reflective surface 5 is provided on the side of the measuring device 2 closest to the radar 4, i.e., on the upper or front surface of the measuring device 2. This reflective surface 5 is the functional surface of the device for reflecting electromagnetic waves. The reflective surface 5 is used to directly reflect the transmitted waves emitted downwards from the transmitting end of the radar 4, and its physical characteristics and geometric configuration must meet the requirements of high-efficiency reflection. Specifically, the reflective surface 5 can be made of a high-conductivity metal plate, such as a copper plate, aluminum plate, or stainless steel plate, and its surface is mirror-polished or electroplated to ensure that it has a reflection coefficient close to total reflection for microwave electromagnetic waves.

[0035] The flatness tolerance of the reflecting surface 5 is controlled within ±0.05 mm to avoid beam divergence or sidelobe interference caused by uneven surface. The reflecting surface 5 is set as a circular plane perpendicular to the axis of the waveguide 1, and the ratio of its diameter to the inner diameter of the waveguide 1 is between 0.85 and 0.95, which ensures sufficient reflection cross-sectional area and provides necessary installation space for the sliding of the measuring device 2. Furthermore, the edges of the reflecting surface 5 can be chamfered or rounded to reduce the contamination of the reflected waveform by edge diffraction. In another optional scheme, the reflecting surface 5 can also be designed as a slightly convex spherical or conical structure to actively control the energy concentration direction of the reflected wave and enhance the echo signal strength, which is especially suitable for measurement tests under long range or high attenuation conditions.

[0036] In practical use, the transmitted wave emitted by the radar 4 transmitter propagates downwards along the waveguide 1. When it encounters the reflecting surface 5 on the measuring device 2, the transmitted wave is reflected by the reflecting surface 5, forming a reflected echo. This echo returns upwards along the waveguide 1 to the radar 4 receiver. By measuring the time difference or frequency difference between the transmitted wave and the received echo, and combining this with the known distance between the measuring device 2 and the radar 4, the measurement error of the radar 4 level gauge can be calculated, thus completing the accuracy verification. Since the measuring device 2 can be positioned arbitrarily within the entire length of the waveguide 1, the operator can set multiple calibration points, record the radar 4 indication value and the actual displacement value one by one, and generate a complete error curve, thereby comprehensively evaluating the linearity, repeatability, and hysteresis characteristics of the radar 4 level gauge.

[0037] Furthermore, to improve the convenience and safety of the sliding operation of the measuring device 2, this application may also provide a removable limiting end cap or anti-fall buffer at the bottom of the waveguide 1 to prevent the measuring device 2 from accidentally sliding out of the waveguide 1. At the same time, several slender observation slots may be opened along the axial direction on the wall of the waveguide 1 and covered with transparent plexiglass or quartz glass, so that the operator can directly observe the current position of the measuring device 2 from the outside, simplifying the position confirmation process.

[0038] In some embodiments, to facilitate the operator's adjustment and precise positioning of the measuring instrument 2 located inside the waveguide 1, this application further provides a limiting member 3 on the outer wall of the waveguide 1. The limiting member 3 and the measuring instrument 2 are connected by relative adsorption, that is, the limiting member 3 and the measuring instrument 2 form a non-contact linkage relationship through magnetic attraction or electromagnetic coupling, so that when the operator moves the limiting member 3 along the axial direction of the waveguide 1, the measuring instrument 2 can move synchronously with the limiting member 3, thereby realizing stepless displacement of the measuring instrument 2 within the waveguide 1. This adsorption linkage design avoids the need to open long grooves or introduce through-type mechanical linkages on the waveguide 1, ensuring the structural integrity and sealing performance of the waveguide 1, and eliminating the risk of leakage and frictional wear caused by mechanical penetration. It is particularly suitable for flammable and explosive gas environments that may exist in ship tanks, and has inherent safety advantages.

[0039] To achieve the aforementioned relative adsorption function, the limiting component 3 includes at least an adsorption component, which embeds a permanent magnet or an electromagnetic coil. When a permanent magnet is used, the permanent magnet is preferably a neodymium iron boron or samarium cobalt rare earth permanent magnet material, which has high remanence and high coercivity, and can provide a sufficiently strong magnetic field within a limited volume to penetrate the wall of the waveguide 1, thereby forming a stable attractive force with the magnetic conductor, such as an iron core or permanent magnet pole, installed inside the measuring device 2. The housing of the measuring device 2 can be made of stainless steel encasing the magnetic core, which ensures sufficient magnetic response sensitivity and prevents the magnetic core material from corroding in the humid environment inside the chamber. In a preferred embodiment, the design value of the adsorption force needs to meet the following dual conditions: on the one hand, the adsorption force should be greater than the resultant force of the weight of the measuring device 2 itself and the sliding friction resistance, to ensure that when the operator pulls the limiting member 3 upward or downward, the measuring device 2 can reliably follow the movement without detachment or lag; on the other hand, the adsorption force should not be too large, so as not to make the operator feel strenuous when moving the limiting member 3, and at the same time to avoid the sliding resistance from increasing dramatically due to excessive radial suction between the measuring device 2 and the inner wall of the waveguide 1.

[0040] Furthermore, the limiting component 3 also includes a connecting ring, which is coaxially sleeved around the outer periphery of the waveguide 1 and fixedly connected to the adsorption component. The overall shape of the connecting ring is a circular ring or a C-shaped open ring, with its inner diameter slightly larger than the outer diameter of the waveguide 1, so that it can be sleeved on the outside of the waveguide 1 and slide freely along the tube wall. The connecting ring can be made of non-magnetic materials such as aluminum alloy, stainless steel, or engineering plastics to avoid bypassing or weakening the magnetic field of the adsorption component.

[0041] In one specific implementation, the adsorption element is a block structure, fixedly installed on one side of the connecting ring, for example facing the operator or facing a position that is easy to read. The connecting ring acts as a carrier to surround the adsorption element around the outside of the waveguide 1, so that the adsorption element and the outer wall of the waveguide 1 maintain a uniform gap, which can ensure that the magnetic force can be effectively penetrated and prevent the connecting ring from directly scratching the waveguide 1.

[0042] To enhance the reliability of the connection between the connecting ring and the adsorption component, they can be fastened with bolts, riveted, or bonded. A locating pin or a raised / lower stop is provided at the connection interface to ensure that the positional accuracy of the adsorption component relative to the connecting ring does not shift due to frequent operation. In some preferred embodiments, the connecting ring is also equipped with one or more balls or pulleys. These rolling elements contact the outer wall of the waveguide 1, converting sliding friction into rolling friction, significantly reducing the resistance when the limiting component 3 moves, making operation easier and smoother.

[0043] The limiting component 3 is also equipped with an indicator line, which serves as a reference mark to reflect the actual spatial position of the reflecting surface 5 on the measuring device 2. Specifically, the position of the indicator line is strictly consistent with the height of the reflecting surface 5 on the measuring device 2, i.e., the axial position of the reflecting surface 5 from the bottom of the waveguide 1 or from a certain reference point. Since the limiting component 3 is linked to the measuring device 2 through magnetic adsorption, and there is no relative displacement between the two in the axial direction, the height of the indicator line is equivalent to the height of the reflecting surface 5 inside the waveguide 1. The indicator line can be formed on the visible outer surface of the connecting ring or the adsorption component by means of laser etching, paint coating, or embedding colored metal wires. Its color should preferably be red, yellow, or fluorescent, which has a bright color difference from the surface of the waveguide 1, so that the operator can still clearly identify it when the lighting conditions inside the chamber are poor. To further improve the reading accuracy, the width of the indicator line is controlled between 0.5 and 1.5 mm, and the indicator line can be designed as a loop line that surrounds the entire circumference of the connecting ring or a short line segment set only on the side facing the operator. The loop line is conducive to observing and reading from multiple angles. During the measurement test, the operator only needs to directly read the scale value on the outer wall of the waveguide 1 corresponding to the indicator line to accurately know the actual position of the measuring device 2. There is no need to use a depth gauge or steel tape measure for indirect measurement, which simplifies the operation steps and reduces human reading errors.

[0044] The outer wall of the waveguide 1 has a sliding surface relative to the limiting member 3. This sliding surface is a structure used to limit the movement trajectory of the limiting member 3 and prevent it from rotating around the axis of the waveguide 1. Specifically, the sidewall of the sliding surface abuts against the sidewall of the limiting member 3, forming a sliding fit pair. In this application, the sliding surface is constructed as a planar structure, that is, the outer wall of the waveguide 1 is not a complete cylindrical surface, but one or more flat longitudinal planes are machined in a certain axial section. This plane extends along the axial direction of the waveguide 1, and its length at least covers the entire adjustable range of the measuring instrument 2. Correspondingly, the inner wall of the limiting member 3 or the inner side of the connecting ring is provided with a planar abutment portion adapted to this plane. When the limiting member 3 is sleeved on the waveguide 1, the planar abutment portion fits against the sliding surface. Since the planes cannot rotate relative to each other, the limiting member 3 is always constrained to a fixed angular position during axial sliding and will not rotate. It ensures that the indicator line always faces the preset observation direction, preventing the indicator line from deviating from the visible area due to the rotation of the limiting member 3, and facilitating continuous reading of the scale; it also ensures that the magnetic pole direction of the adsorption member is always aligned with the direction of the magnet inside the measuring device 2, thereby maintaining the maximum magnetic adsorption force and avoiding magnetic force attenuation or even repulsion caused by relative torsion.

[0045] The sliding surface can be formed on the outer wall of the waveguide 1 by milling or planing. After machining, it needs to be deburred and surface passivated to reduce the coefficient of friction and prevent corrosion. In some embodiments, the sliding surface can also be set as multiple parallel planes, for example, one plane on each side of the waveguide 1, and the inner wall of the corresponding limiting member 3 is provided with a double-plane structure, thereby further improving the reliability of anti-rotation.

[0046] To facilitate intuitive reading of the displacement values ​​of the measuring instrument 2 by operators, scale lines are provided on the outer wall of the waveguide 1. The scale lines are evenly distributed along the axial direction of the waveguide 1, with their starting points typically set at the upper flange face or lower reference surface of the waveguide 1. The scale values ​​increase with axial distance, preferably in centimeters or millimeters, to meet the calibration requirements of the radar 4 level gauge. The scale lines can be marked using durable processes such as laser marking, chemical etching, or mechanical printing to ensure long-term legibility in the high humidity and potential oil and gas corrosion environment of a ship's cabin. To improve the convenience of rapid reading, the scale lines can be designed with combinations of different lengths and widths: long scale lines marked with numbers are provided every 10 centimeters, and short scale lines are provided every 1 centimeter, with the color of the scale lines contrasting highly with the base color of the waveguide 1. Furthermore, the zero point of the scale line can be precisely calibrated with the mounting face of radar 4 or the bottom face of waveguide 1, and the system error is pre-calibrated in the scale value, so that the value read by the operator directly corresponds to the actual distance between reflector 5 and radar 4, without the need for secondary conversion. During the measurement test, the operator only needs to align the indicator line on the limit piece 3 with the target scale to position the measuring device 2 to the preset calibration point, and then start radar 4 to perform echo measurement, which greatly improves the efficiency of multi-point calibration.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A test device for measuring liquid level using a ship's radar level gauge, characterized in that, include: waveguide (1); The measuring device (2) is disposed inside the waveguide (1) and is slidably connected to the waveguide (1); A limiting member (3) is installed on the side wall of the waveguide (1) to limit the position of the measuring device (2) inside the waveguide (1); Radar (4), installed on the waveguide (1), with the generating end of the radar (4) at least partially overlapping with the measuring device (2) along the length of the waveguide (1); A reflective surface (5) is disposed at one end of the measuring instrument (2) near the radar (4) for reflecting the emitted waves emitted by the radar (4).

2. The ship radar level gauge measurement and testing device according to claim 1, characterized in that, The limiting member (3) is disposed on the outside of the waveguide (1), and the limiting member (3) is attracted to the measuring device (2).

3. The ship radar level gauge measurement and testing device according to claim 2, characterized in that, Two limiting members (3) are provided relative to the side wall of the measuring device (2), and the line connecting the two adsorption members is set along the width direction of the measuring device (2).

4. The ship radar level gauge measurement and testing device according to claim 1, characterized in that, The limiting member (3) also includes a connecting ring, which is coaxially arranged with the waveguide (1) and is fixedly connected to the limiting member (3).

5. The ship radar level gauge measurement and testing device according to claim 1, characterized in that, The reflective surface (5) is set perpendicular to the radar (4) transmitting wave.

6. The ship radar level gauge measurement and testing device according to claim 1, characterized in that, The outer wall of the measuring device (2) abuts against the inner wall of the waveguide (1).

7. The ship radar level gauge measurement and testing device according to claim 1, characterized in that, The limiting member (3) is provided with an indicator line, and the indicator line is at the same height as the reflective surface (5).

8. The ship radar level gauge measurement and testing device according to claim 1, characterized in that, The outer wall of the waveguide (1) is provided with a sliding surface relative to the limiting member (3), and the side wall of the sliding surface abuts against the side wall of the limiting member (3).

9. The ship radar level gauge measurement and testing device according to claim 8, characterized in that, The sliding surface has a planar structure.

10. The ship radar level gauge measurement and testing device according to claim 9, characterized in that, The outer wall of the waveguide (1) is provided with scale lines.

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