Calibration device of radar level meter with calibration function
By setting multiple reflectors in the calibration device of the radar level gauge and using a calibration position and a laser for calibration, the measurement error problem caused by the movement of the target plate is solved, and high-precision radar level gauge calibration is achieved.
Patent Information
- Application Number
- CN202423035006.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-10
AI Technical Summary
Existing radar level gauges have difficulty maintaining verticality during target plate movement when the measurement range is large, leading to cumulative measurement errors. Furthermore, they lack calibration functions for target plates at preset reference points.
Multiple reflectors are set at preset reference points. The reflectors are calibrated by a calibration position and a laser, avoiding the need to move the reflectors and ensuring that the reflectors are rotated to the working calibration position or non-working calibration position during measurement to meet the calibration requirements.
This reduces measurement errors, improves the calibration accuracy of the radar level gauge, and ensures accurate calibration of the reflector at multiple reference points.
Smart Images
Figure CN223538386U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of calibration device technology, specifically to a calibration device for a radar level gauge with calibration function. Background Technology
[0002] In existing technologies, the calibration of radar level gauges typically involves the radar level gauge emitting a radar signal towards a movable target plate and receiving the reflected signal from the target plate. The calibration distance is then determined based on the distance between the radar level gauge and the target plate. This distance is obtained using a measuring device. However, when the radar level gauge has a large range, calibration requires at least 5 to 10 points, necessitating multiple long-distance movements of the target plate. Maintaining accuracy during each of these movements becomes difficult.
[0003] Furthermore, when the measurement range is large, it is difficult to ensure the verticality of the target plate during movement and operation. For example, the verticality error and the range error will be superimposed, resulting in a large measurement error. This will cause the main lobe of the reflected signal to be misaligned with the radar level gauge, thus causing the radar level gauge to have measurement error.
[0004] Currently, there is no publicly available technology for calibrating radar level gauges without moving the target plate, nor is there a publicly available device for calibrating whether the target plate at the preset reference point meets the calibration requirements. Utility Model Content
[0005] This utility model provides a calibration device for a radar level gauge with calibration function, which solves the technical problems of existing target plates having difficulty in ensuring verticality during movement and operation, verticality error and range error superimposed to cause large measurement error in the radar level gauge calibration process, and lack of calibration function to determine whether the target plate moved to the preset reference point position meets the calibration requirements.
[0006] To achieve the above objectives, this utility model provides a calibration device for a radar level gauge with calibration function, including multiple reflectors, all of which are located on opposite sides of the radar level gauge, for receiving radar waves emitted by the radar level gauge and reflecting the radar waves to form reflected waves.
[0007] The radar level gauge obtains distance measurement values by emitting radar waves to the reflector and receiving the reflected waves reflected by the reflector, and multiple reflectors are set at multiple preset reference points.
[0008] The reflector is provided with a calibration position, which is used to calibrate the reflector through a calibration signal.
[0009] In one possible implementation of this invention, the calibration position is provided at the edge of the reflector.
[0010] In one possible implementation of this utility model, a scale is provided at the calibration position, and the calibration signal being within the calibration area calibrated by the scale indicates that the reflector currently meets the calibration requirements.
[0011] In one possible implementation of this utility model, the first or last reflector is provided with a mounting hole for mounting a laser. The laser is used to sequentially emit calibration signals to calibration positions on the reflector on which the laser is not mounted, so as to calibrate multiple reflectors.
[0012] Alternatively, the laser is mounted on a calibration platform to sequentially transmit calibration signals to calibration positions on multiple reflectors, thereby calibrating the multiple reflectors.
[0013] In one possible implementation of this invention, a plurality of the reflectors are arranged in parallel, and the plurality of the reflectors are perpendicular to the direction of the radar waves emitted by the radar level gauge.
[0014] In one possible implementation of this utility model, when the plurality of reflectors are calibrated or adjusted, one of the reflectors is in the working calibration position, while the other reflectors are in the non-working calibration position.
[0015] In one possible implementation of this utility model, the reflector is disposed on the fixed bracket, and the reflector is rotated on the fixed bracket to the working calibration position or the non-working calibration position via a rotating shaft.
[0016] In one possible implementation of this utility model, the rotation of the reflector to the working calibration position or the non-working calibration position is achieved manually or by a driving component.
[0017] In one possible implementation of this utility model, the driving component is a drive motor.
[0018] In one possible implementation of this utility model, a limiting part is further included, which is fixedly disposed on the fixed bracket and is used to limit the rotation of the reflector to the working calibration position.
[0019] In one possible implementation of this utility model, a fixed support plate is provided on the fixed bracket, and the limiting part, the driving component and the rotating shaft are fixedly mounted on the fixed support plate.
[0020] In one possible implementation of this utility model, the fixed bracket includes a first bracket and a second bracket, the first bracket and the second bracket forming an angle, and the first bracket or the second bracket having an angle with the reflector.
[0021] In one possible implementation of this utility model, the first bracket and the second bracket are arranged perpendicularly and adjacent to each other.
[0022] In one possible implementation of this utility model, the angle between the first bracket or the second bracket and the reflector is 45°.
[0023] In one possible implementation of this utility model, the fixed support plate, the limiting part, the driving component and the rotating shaft are arranged in the space area enclosed by the first bracket and the second bracket.
[0024] In one possible implementation of this utility model, the number of reflectors is greater than or equal to the number of preset reference point positions.
[0025] In one possible implementation of this utility model, a reflector is further included, which is arranged parallel to the reflector plate and is used to receive and reflect the calibration signal to determine whether the reflector plate meets the calibration requirements.
[0026] This invention provides a calibration device for a radar level gauge with calibration function, comprising multiple reflectors located opposite the radar level gauge for receiving radar waves emitted by the radar level gauge and reflecting the radar waves to form reflected waves. The radar level gauge obtains distance measurement values by emitting radar waves to the reflectors and receiving the reflected waves. The multiple reflectors are arranged at preset reference points, and each reflector has a calibration position for calibrating the reflector via a calibration signal. This invention eliminates the need to move the reflectors during distance measurement by correspondingly arranging multiple reflectors at multiple preset reference points. Each reflector can rotate to a working calibration position during measurement and to a non-working calibration position during non-distance measurement. Furthermore, multiple reflectors can be calibrated before calibration to meet calibration requirements, thereby significantly reducing measurement errors. Attached Figure Description
[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0028] Figure 1 This is a schematic diagram of the structure of a calibration device for a radar level gauge with calibration function provided by this utility model. Figure 1 ;
[0029] Figure 2 This is a schematic diagram of the structure of a calibration device for a radar level gauge with calibration function provided by this utility model. Figure 2 ;
[0030] Figure 3 This is a schematic diagram of the structure of a calibration device for a radar level gauge with calibration function provided by this utility model. Figure 3 ;
[0031] Figure 4 This is a schematic diagram of the structure of the reflector in this utility model, which is set at a preset reference point. Figure 1 ;
[0032] Figure 5 yes Figure 4 Partial structural diagram;
[0033] Figure 6 This is a schematic diagram of the structure of the reflector in this utility model, which is set at a preset reference point. Figure 2 ;
[0034] Figure 7 This is a schematic diagram of a partial installation structure of a reflector with mounting holes;
[0035] Figure 8 This is a schematic diagram of a partial installation structure of a reflector with calibration positions.
[0036] Summary of attached image labels:
[0037] 1. Radar level gauge; 2. Reflector; 21. Calibration position.
[0038] 22. Mounting hole 3. Mounting platform 4. Fixing bracket
[0039] 41. First bracket; 42. Second bracket; 5. Fixed support plate
[0040] 6. Rotating shaft; 7. Limiting part; 8. Driving component
[0041] 9. Mounting base 91, threaded assembly 92, support feet Detailed Implementation
[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.
[0043] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The technical solution of this utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0044] Unless otherwise stated, the exemplary embodiments / exemplifications shown are to be understood as providing exemplary features of various details of ways in which the technical concept of this utility model can be implemented in practice. Therefore, unless otherwise stated, the features of various embodiments / exemplifications may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concept of this utility model.
[0045] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.
[0046] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.
[0047] like Figure 1 and 2 As shown, this utility model discloses a calibration device for a radar level gauge with calibration function, including multiple reflectors 2, all located opposite the radar level gauge 1, for receiving radar waves emitted by the radar level gauge 1 and reflecting the radar waves to form reflected waves. The radar level gauge 1 obtains distance measurement values by emitting radar waves to the reflectors 2 and receiving the reflected waves. The multiple reflectors 2 are arranged at preset reference points. Each reflector 2 has a calibration position 21, which is used to calibrate the reflector 2 through a calibration signal.
[0048] Among them, such as Figure 6 and 8 As shown, calibration positions 21 can be provided at the edge of the reflector 2, and the figure shows three calibration positions 21. It should be noted that the number of calibration positions 21 is not specifically limited, and the specific number can be set according to the size of the reflector 2 or the calibration distance.
[0049] Specifically, a scale is provided at the calibration position 21. If the calibration signal falls within the calibration area defined by the scale, it indicates that the reflector 2 currently meets the calibration requirements. The scale is pre-drawn on the reflector 2 and typically consists of multiple coaxial circles. The first circle is marked 0, the second circle is marked 1, and the third circle is marked 2. Generally, a calibration signal within the range of the circle marked 1 is considered a calibration signal that meets the calibration requirements, and in this case, the reflector 2 is considered a reflector 2 that meets the calibration requirements.
[0050] This invention comprises multiple reflectors 2. To enable sequential calibration of the multiple reflectors 2, it is preferable to provide mounting holes 22 on the first or last reflector 2. These mounting holes 22 are used to mount a laser, which sequentially emits calibration signals to calibration positions 21 on the reflectors without the laser mounted, thereby calibrating the multiple reflectors 2. Alternatively, the laser can be placed on a calibration platform (located outside the multiple reflectors 2) to sequentially emit calibration signals to calibration positions 21 on the multiple reflectors 2, thus calibrating the multiple reflectors 2.
[0051] like Figures 4-8 As shown, taking five reflectors 2 as an example, the first or last reflector 2 is provided with a mounting hole 22, and the other four reflectors 2 are provided with calibration positions 21. The size of the mounting hole 22 is larger than the size of the calibration position 21. After placing the five reflectors 2 according to the number of preset reference points, the five reflectors can be calibrated first. Once the calibration meets the requirements, the radar level gauge can then be calibrated.
[0052] It should be noted that the aforementioned calibration position 21 can be a calibration hole, calibration point, or calibration ruler, as long as it is used to calibrate the calibration signal to determine whether the position of the reflector 2 meets the calibration requirements.
[0053] First, a laser is installed in the mounting hole 22 on the reflector 2. The laser then sequentially emits calibration signals (laser signals) to the corresponding calibration positions 21 on the other four reflectors 2. If the calibration signal falls within the calibration area marked by the scale on the reflector 2, it indicates that the reflector 2 meets the calibration requirements. The five reflectors 2 are placed sequentially in the order of number 1 to 5. The reflector 2 with the mounting hole 22 is either reflector 2 numbered 1 or reflector 2 numbered 5. Taking reflector 2 numbered 1 with the mounting hole 22 as an example, after installing the laser, calibration signals are sequentially emitted to reflectors 2 numbered 2, 3, 4, and 5. If the calibration signal received by each reflector 2 falls within the calibration area marked by the scale on its own reflector 2, it indicates that all reflectors 2 meet the calibration requirements, meaning that multiple reflectors 2 are arranged in parallel. If the calibration signal received by one or more reflectors 2 is not within the calibration area marked by the scale on their own reflector 2, it means that the reflector 2 does not meet the calibration requirements. At this time, it is necessary to adjust the position information such as the height or horizontal angle of the current reflector 2 until the calibration requirements are met.
[0054] Alternatively, a laser can be installed on a calibration platform, located opposite the first or last reflector 2. The five reflectors 2 are numbered 1, 2, 3, 4, and 5. Each of the five reflectors 2 has a calibration position 21. The laser sequentially emits calibration signals (laser signals) to the corresponding calibration positions 21 on each of the five reflectors 2. If the calibration signal falls within the calibration area marked by the scale on the reflector 2, it indicates that the reflector 2 meets the calibration requirements. The five reflectors 2 are placed sequentially in the order of number 1 to 5. After installing the laser on the calibration platform, calibration signals are sequentially emitted to reflectors 2 numbered 1, 2, 3, 4, 5, or 5, 4, 3, 2, 1. If the calibration signal received by each reflector 2 falls within the calibration area marked by the scale on its own reflector 2, it indicates that all reflectors 2 meet the calibration requirements, meaning that multiple reflectors 2 are arranged in parallel. If the calibration signal received by one or more reflectors 2 is not within the calibration area marked by the scale on their own reflector 2, it means that the reflector 2 does not meet the calibration requirements. At this time, it is necessary to adjust the position information such as the height or horizontal angle of the current reflector 2 until the calibration requirements are met.
[0055] Since the calibration of the radar level gauge 1 requires calibration at least 5 to 10 points, in order to meet the distance measurement needs under different distance conditions such as short distance or long distance, the number of reflectors 2 in this invention is set to be greater than or equal to the number of preset reference points. This allows for the selection of the same number of reflectors 2 as the number of preset reference points at different measurement distances.
[0056] For example, when the measurement distance is 25m, five reflectors 2 can be set at distances of 5m, 10m, 15m, 20m, and 25m respectively, and these five reflectors 2 correspond exactly to the positions of five preset reference points. When the measurement distance is 15m, five reflectors 2 can be set at distances of 3m, 6m, 9m, 12m, and 15m respectively, and the preset reference point position corresponding to the 15m distance can be selected using the reflector 2 at the measurement distance of 25m. When the measurement distance is 50m, six reflectors 2 can be set at distances of 5m, 10m, 20m, 30m, 40m, and 50m respectively, and the preset reference point positions corresponding to the 5m, 10m, and 20m distances can be selected using the reflector 2 at the measurement distance of 25m.
[0057] In this utility model, a set of reflectors 2 with the same structure is set up. There are multiple reflectors 2 with the same structure. During the calibration or adjustment of the radar level gauge 1, the number and spacing of the multiple reflectors 2 can be selected according to the number of preset reference points and the distance of measurement.
[0058] For example, when performing long-distance measurements, a large number of reflectors 2 can be set up. When performing short-distance measurements later, a portion of the reflectors 2 can be selected for distance measurement. The position of this portion of the reflectors 2 corresponds to the position of the current preset reference point.
[0059] To ensure the accuracy of distance measurements and avoid distance measurement errors caused by moving the reflector 2 during the measurement process, this utility model provides multiple reflectors 2, which are arranged in parallel and perpendicular to the direction of the radar waves emitted by the radar level gauge 1.
[0060] During the calibration of the radar level gauge: This invention includes multiple reflectors 2. During the calibration of the radar level gauge 1, the radar level gauge 1 sequentially emits radar waves to multiple reflectors 2 at multiple preset reference points, preferably in the calibration order. When calibrating the radar level gauge 1, one of the reflectors 2 is in the working calibration position, while the others are in non-working calibration positions. The reflectors 2 in the working calibration position are perpendicular to the direction of the radar waves emitted by the radar level gauge 1, and are used to receive and reflect the radar waves; the reflectors 2 in the non-working calibration positions are parallel or nearly parallel to the direction of the radar waves emitted by the radar level gauge 1, and do not receive or reflect radar waves at this position.
[0061] Taking a radar level gauge 1 with five reflectors 2 arranged sequentially from closest to furthest away as an example, the five reflectors 2 are numbered 1, 2, 3, 4, and 5. These five reflectors 2 are positioned at five preset reference points. During calibration, the radar level gauge 1 first emits radar waves towards reflector 2 numbered 1. At this point, reflector 2 numbered 1 is in the working calibration position, while the other reflectors 2 numbered 2 to 5 are in non-working calibration positions. After the radar level gauge 1 receives the reflected wave from reflector 2 numbered 1, reflector 2 numbered 1 is rotated to the non-working calibration position by a drive motor or manually, while reflector 2 numbered 2 is rotated to the working calibration position. Reflectors 2 numbered 3 to 5 remain in the non-working calibration positions. This process continues until the radar level gauge 1 receives the reflected wave from reflector 2 numbered 5. At this time, the radar level gauge 1 will receive five distance measurement values. The radar level gauge 1 is calibrated by analyzing and comparing these five distance measurement values with five preset distance standard values. The distance standard values can be measured by a distance measuring device, such as a high-precision distance measuring device like a linear encoder.
[0062] During the calibration of the radar level gauge 1 calibration device: This invention includes multiple reflectors 2, which are preferably calibrated sequentially according to the calibration order. When calibrating the radar level gauge 1 calibration device, one of the reflectors 2 is in the working calibration position, while the remaining reflectors 2 are in the non-working calibration position.
[0063] Taking a radar level gauge 1 with five reflectors 2 arranged sequentially from closest to furthest distance as an example, the five reflectors 2 are numbered 1, 2, 3, 4, and 5. These five reflectors 2 are positioned at five preset reference points. During calibration, the laser first emits a calibration signal to reflector 2 numbered 1, which is then in its working calibration position. The other reflectors 2 to 5 are in their non-working calibration positions. After reflector 2 numbered 1 receives the calibration signal, it is manually observed whether the received calibration signal is within the specified range. If the calibration signal is within the calibration range marked by the scale on the reflector 2, it means that the reflector 2 meets the calibration requirements. At this time, the reflector 2 numbered 1 is rotated to a non-working calibration position by the drive motor or manually, while the reflector 2 numbered 2 is rotated to the working calibration position. The reflectors 2 numbered 3 to 5 remain in the non-working calibration position. This principle continues until the calibration signal received by all the reflectors 2 numbered 1 to 5 is within the calibration range marked by the scale on their own reflector 2. At this time, the calibration requirements are met, that is, multiple reflectors 2 are set up in parallel.
[0064] This invention provides a calibration device for a radar level gauge 1 with calibration function, comprising multiple reflectors 2, each located opposite the radar level gauge 1. These reflectors 2 receive radar waves emitted by the radar level gauge 1 and reflect the radar waves to form reflected waves. The radar level gauge 1 obtains distance measurement values by emitting radar waves to the reflectors 2 and receiving the reflected waves. The multiple reflectors 2 are positioned at preset reference points. Each reflector 2 has a calibration position 21, which is used to calibrate the reflector 2 via a calibration signal. This invention eliminates the need to move the reflectors 2 during distance measurement by setting multiple reflectors 2 at multiple preset reference points. Each reflector 2 can rotate to a working calibration position during measurement and to a non-working calibration position during non-distance measurement. Furthermore, multiple reflectors can be calibrated before calibration to meet calibration requirements, thereby significantly reducing measurement errors.
[0065] like Figures 1-3 As shown, during the calibration of radar level gauge 1, radar level gauge 1 needs to be placed on mounting platform 3. In order for the radar waves emitted by radar level gauge 1 to be received and emitted by reflector plate 2, reflector plate 2 is correspondingly placed on fixed bracket 4. The reflector plate 2 is rotated on fixed bracket 4 to the working calibration position or non-working calibration position via rotating shaft 6.
[0066] During the calibration of the radar level gauge 1 or the calibration device, the reflector 2 can be manually switched between the working calibration position and the non-working calibration position, or it can be switched using the drive component 8. A limiting part 7 can be fixedly installed on the fixed bracket 4, and the reflector 2 can be rotated to the limiting part 7 to switch from the non-working calibration position to the working calibration position. Since the stability of the reflector 2's position needs to be ensured during distance measurement, and to overcome the distance error caused by moving the reflector 2 to multiple preset reference points in the prior art, the limiting part 7 is used to mechanically limit the working calibration position. This ensures that the reflector 2 can only move within a limited range. Compared to the prior art method of measuring distance by moving one reflector 2 to multiple preset reference points, this invention uses multiple parallel reflectors 2 at multiple preset reference points, with the positions pre-calibrated by the system. During the measurement process, the reflectors 2 are not moved; distance measurement is achieved only by rotating the reflector 2 at multiple preset reference points.
[0067] The calibration device of the radar level gauge may further include a reflector, which is arranged parallel to the reflector plate 2 and is used to receive and reflect the calibration signal. The position of the reflected calibration signal is used to determine whether the reflector plate 2 meets the calibration requirements. For example, after the reflector is installed, if the calibration signal shifts by 1 mm, the received calibration signal after reflection will shift by 2 mm. The reflected calibration signal can be received by a calibration position set at the location where the laser emits the calibration signal. For example, a calibration position can be set at the location where the laser emits the calibration signal, and a scale can be set on the calibration position. If the reflected calibration signal is within the calibration area calibrated by the scale, it indicates that the reflector plate 2 meets the calibration requirements. The scale is pre-drawn on the reflector plate 2, usually consisting of multiple coaxial circles. The first circle is marked as 0, the second circle as 1, and the third circle as 2. Generally, the calibration signal within the range of the circle marked as 1 is considered to meet the calibration requirements, and in this case, the reflector plate 2 meets the calibration requirements. It should be noted that since the calibration signal reflected by the reflector is amplified, the calibration signal reflected by the reflector can be considered to be within the circle marked 2 as a calibration signal that meets the calibration requirements. This setting allows the reflector to amplify the calibration signal that the reflector 2 should receive if it does not meet the calibration requirements, thereby making it easier to obtain the offset position of the reflector 2 and then adjust its position accordingly to meet the calibration requirements.
[0068] The aforementioned limiting part 7 is mainly used to limit the rotation of the reflector 2 from the non-working calibration position to the working calibration position. Rotation from the non-working calibration position to the working calibration position can also be achieved by the limiting part, or by controlling the rotation angle through the control module. In the non-working calibration position, the limiting part is hidden in the space area enclosed by the first bracket 41 and the second bracket 42, so it will not receive radar waves and will not affect the distance measurement during the calibration process.
[0069] It should be noted that the aforementioned limiting part 7 can also be a limiting electronic switch, i.e., an electronic switch assembly, or the limiting part 7 can be combined with a limiting electronic assembly to achieve the limiting function. For example, the electronic switch assembly can be a photoelectric switch assembly, a capacitive proximity switch assembly, an inductive proximity switch assembly, etc.
[0070] To achieve intelligent rotation of the reflector 2, the reflector 2 can be rotated by a drive component 8, preferably a drive motor.
[0071] Specifically, such as Figure 2 and 4 As shown in Figure -8, the fixed bracket 4 includes a first bracket 41 and a second bracket 42, which form an angle. The first bracket 41 or the second bracket 42 also forms an angle with the reflector 2. A fixed support plate 5 is provided on the fixed bracket 4. The limiting part 7, the driving component 8, and the rotating shaft 6 are fixedly mounted on the fixed support plate 5. The fixed support plate 5, the limiting part 7, the driving component 8, and the rotating shaft 6 are located within the space enclosed by the first bracket 41 and the second bracket 42.
[0072] like Figure 5 As shown, the first bracket 41 and the second bracket 42 are vertically arranged, and the fixed support plate 5 is horizontally arranged in the included space area formed by the first bracket 41 and the second bracket 42. The fixed support plate 5 is provided with a rotating shaft 6 for driving the reflector 2 to rotate, a drive motor, and a limiting part 7.
[0073] To prevent the radar level gauge 1 from receiving reflected waves from other objects after the radar waves emitted towards the reflector plate 2 are reflected, it is preferable that the first bracket 41 and the second bracket 42 are arranged perpendicularly and adjacently, with the angle between the first bracket 41 or the second bracket 42 and the reflector plate 2 being 45°. During distance measurement, the reflector plate 2 is rotated to a position at 45° to the first bracket 41 or the second bracket 42. This position is perpendicular to the direction of the radar waves emitted by the radar level gauge 1. From this position, looking from the direction of the radar waves emitted by the radar level gauge 1, only the first bracket 41, the second bracket 42, and the reflector plate 2 are visible; other components (fixed support plate 5, drive motor, or rotating shaft 6) are not visible.
[0074] In this invention, the first bracket 41 and the second bracket 42 are arranged perpendicularly and adjacently, and the angle between the first bracket 41 or the second bracket 42 and the reflector 2 is 45°. After the radar level gauge 1 emits radar waves perpendicularly towards the reflector 2, it will only receive the reflected waves reflected by the reflector 2. If the first bracket 41 or the second bracket 42 receives a portion of the radar waves, it will reflect a reflected wave parallel to the reflector 2. This reflected wave parallel to the reflector 2 is perpendicular to the reflected wave perpendicular to the reflector 2. Therefore, the radar level gauge 1 will not receive the reflected wave reflected by the first bracket 41 or the second bracket 42, thereby making the distance measurement more accurate.
[0075] When placing the reflector 2 at the preset reference point, position calibration is required. During calibration, it may be necessary to adjust the height or horizontal angle of the reflector 2. For this purpose, a mounting base 9 can be provided at the bottom of the fixed bracket 4. The mounting base 9 is connected to the fixed bracket 4, and the height of the fixed bracket 4 can be adjusted through the threaded assembly 91 on the mounting base 9.
[0076] like Figure 1 , 2 As shown in Figures 4 and 6, threaded components 91 can be provided around or on the side of the mounting base 9. The threaded components 91 are fixedly mounted on the support feet 92. The support feet 92 and the mounting base 9 are movably connected through the threaded components 91 to adjust the height or position of the fixed bracket 4.
[0077] The calibration method for the calibration device of the radar level gauge with calibration function of this utility model includes the following steps:
[0078] Radar level gauge 1 emits radar waves;
[0079] The radar waves are reflected by the reflector 2 set at each preset reference point position;
[0080] The radar level gauge 1 receives reflected waves reflected by the reflector 2 at multiple preset reference points to obtain multiple distance measurement values at the multiple preset reference points.
[0081] The radar level gauge 1 is calibrated by using multiple distance measurements and multiple preset distance standard values.
[0082] During the calibration of radar level gauge 1, radar level gauge 1 needs to be placed on mounting platform 3. In order for the radar waves emitted by radar level gauge 1 to be received and emitted by reflector plate 2, reflector plate 2 is correspondingly placed on fixed bracket 4. The reflector plate 2 is rotated on fixed bracket 4 to the working calibration position or non-working calibration position via rotating shaft 6.
[0083] The rotation of the reflector 2 to the working calibration position or the non-working calibration position can be achieved manually or by the drive component 8. A limiting part 7 can be fixedly installed on the fixed bracket 4, and the reflector 2 is rotated to the limiting part 7 to switch from the non-working calibration position to the working calibration position. Since distance measurement requires ensuring the stability of the reflector 2's position during measurement and overcoming the distance error caused by moving the reflector 2 to multiple preset reference points, the limiting part 7 is used to mechanically limit the working calibration position. This ensures that the reflector 2 can only move within a limited range. Compared to the existing technology that moves a single reflector 2 to multiple preset reference points for distance measurement, this invention uses multiple parallel reflectors 2 at preset reference points, with the positions pre-calibrated by the system. During the measurement process, the reflectors 2 are not moved; distance measurement at multiple preset reference points is achieved solely by rotating the reflector.
[0084] The radar level gauge 1 receives reflected waves from the reflector 2 at multiple preset reference points to obtain multiple distance measurement values at those points, including the following steps:
[0085] Multiple reflectors 2 are arranged in a calibration order at corresponding preset reference point positions;
[0086] Control the multiple reflectors 2 to rotate sequentially to the working calibration position according to the calibration order;
[0087] The radar level gauge 1 receives and records multiple distance measurements.
[0088] It should be noted that in this utility model, the control device can control the drive motor to rotate the reflector 2 to the working calibration position in sequence. After the reflected wave reflected by the current reflector 2 is received by the radar level gauge 1, the control device receives the reflected wave signal and controls the drive motor to rotate the current reflector 2 to the non-working calibration position. At the same time, the adjacent reflector 2 is rotated to the working calibration position. The reflected wave signals at all preset reference point positions are obtained in this way.
[0089] Because the calibration process of radar level gauge 1 requires calibration at least 5 to 10 points, the following example uses five reflectors 2 numbered 1 to 5 and five preset reference points. The control device can simultaneously communicate with radar level gauge 1 and the drive component, controlling radar level gauge 1 to receive the reflected wave signals from reflectors 2 in sequence. For example, it can rotate the corresponding reflectors 2 to the working calibration position in the order of number 1, 2, 3, 4, 5, 5, 4, 3, 2, 1 to perform distance measurement. Of course, it can also rotate the corresponding reflectors 2 to the working calibration position in the order of number 1, 2, 3, 4, 5, 5, etc. to perform distance measurement.
[0090] To ensure more accurate distance measurements, at least two distance measurements should be obtained at each preset reference point, preferably five distance measurements, and then compared with preset distance standard values to calibrate the radar level gauge 1.
[0091] However, in order to obtain more accurate multiple distance measurements, calibration is required before the radar level gauge is calibrated. Specifically, the calibration method for the radar level gauge calibration device includes the following steps:
[0092] Each of the multiple reflectors 2 is equipped with a calibration position 21;
[0093] The laser sequentially emits calibration signals to the calibration positions 21 on the multiple reflectors 2;
[0094] The calibration position 21 receives the calibration signal and determines whether the reflector 2 meets the calibration requirements by checking whether the calibration signal is within the calibration area marked on the calibration position 21.
[0095] The position of the reflector 2 that does not meet the calibration requirements is adjusted until it meets the calibration requirements.
[0096] The process of the laser sequentially transmitting calibration signals to calibration positions 21 on multiple reflectors 2 includes the following steps:
[0097] The laser emits a calibration signal to the current reflector 2, and the current reflector 2 rotates to the working calibration position, while the other reflectors 2 rotate to non-working calibration positions;
[0098] After the current reflector 2 is calibrated, the current reflector 2 is rotated to a non-working calibration position, and the next reflector 2 to be calibrated is rotated to a calibration position;
[0099] Repeat the above steps to complete the laser transmitting calibration signals to the calibration positions 21 on all the reflectors 2.
[0100] This invention sets multiple reflectors 2 at multiple preset reference points, so that the reflectors 2 do not need to be moved during distance measurement. Each reflector 2 can be rotated to the working calibration position during measurement and to the non-working calibration position when not measuring distance. Furthermore, the multiple reflectors 2 are calibrated before calibration to meet the calibration requirements, thereby greatly reducing measurement errors.
[0101] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0102] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.
[0103] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.
Claims
1. A calibration device for a radar level gauge with calibration function, characterized in that, It includes multiple reflectors, all of which are located on the opposite side of the radar level gauge, for receiving radar waves emitted by the radar level gauge and reflecting the radar waves to form reflected waves; The radar level gauge obtains distance measurement values by emitting radar waves to the reflector and receiving the reflected waves reflected by the reflector. Multiple reflectors are arranged at multiple preset reference point positions; wherein, the number of reflectors is greater than or equal to the number of preset reference point positions. The reflector is provided with a calibration position, which is used to calibrate the reflector through a calibration signal.
2. The calibration device for a radar level gauge with calibration function according to claim 1, characterized in that, The calibration position is provided at the edge of the reflector.
3. The calibration device for a radar level gauge with calibration function according to claim 1, characterized in that, A scale is provided at the calibration position, and the fact that the calibration signal is within the calibration area calibrated by the scale indicates that the reflector currently meets the calibration requirements.
4. The calibration device for a radar level gauge with calibration function according to claim 1, characterized in that, The first or last reflector is provided with a mounting hole for mounting a laser. The laser is used to sequentially emit calibration signals to calibration positions on the reflector on which the laser is not mounted, so as to calibrate multiple reflectors. Alternatively, the laser is mounted on a calibration platform to sequentially transmit calibration signals to calibration positions on multiple reflectors, thereby calibrating the multiple reflectors.
5. The calibration device for a radar level gauge with calibration function according to claim 1, characterized in that, The plurality of reflectors are arranged in parallel, and the plurality of reflectors are perpendicular to the direction of the radar waves emitted by the radar level gauge.
6. The calibration device for a radar level gauge with calibration function according to claim 1, characterized in that, When the plurality of reflectors are calibrated or adjusted, one of the reflectors is in the working calibration position, while the other reflectors are in the non-working calibration position.
7. The calibration device for a radar level gauge with calibration function according to claim 6, characterized in that, The reflector is mounted on a fixed bracket, and the reflector can be rotated on the fixed bracket to the working calibration position or the non-working calibration position via a rotating shaft.
8. The calibration device for a radar level gauge with calibration function according to claim 7, characterized in that, The rotation of the reflector to the working calibration position or the non-working calibration position is achieved manually or by a driving component.
9. The calibration device for a radar level gauge with calibration function according to claim 8, characterized in that, The driving component is a drive motor.
10. The calibration device for a radar level gauge with calibration function according to claim 8, characterized in that, It also includes a limiting part, which is fixedly mounted on the fixed bracket and is used to limit the rotation of the reflector to the working calibration position.
11. The calibration device for a radar level gauge with calibration function according to claim 10, characterized in that, A fixed support plate is provided on the fixed bracket, and the limiting part, the driving component and the rotating shaft are fixedly mounted on the fixed support plate.
12. The calibration device for a radar level gauge with calibration function according to claim 11, characterized in that, The fixed bracket includes a first bracket and a second bracket, the first bracket and the second bracket forming an angle, and the first bracket or the second bracket having an angle with the reflector.
13. The calibration device for a radar level gauge with calibration function according to claim 12, characterized in that, The first bracket and the second bracket are arranged perpendicularly and adjacent to each other.
14. The calibration device for a radar level gauge with calibration function according to claim 12, characterized in that, The angle between the first or second bracket and the reflector is 45°.
15. The calibration device for a radar level gauge with calibration function according to claim 12, characterized in that, The fixed support plate, the limiting part, the driving component, and the rotating shaft are arranged in the space area enclosed by the first bracket and the second bracket.
16. The calibration device for a radar level gauge with calibration function according to claim 4, characterized in that, It also includes a reflector, which is arranged parallel to the reflector plate and is used to receive and reflect the calibration signal. The position of the reflected calibration signal is used to determine whether the reflector plate meets the calibration requirements.