Calibration device and calibration method of radar level meter with calibration function

Abstract

The invention provides a calibration device of a radar level meter with a calibration function, which comprises a plurality of reflecting plates positioned on the opposite side of the radar level meter and used for receiving radar waves emitted by the radar level meter and reflecting the radar waves to form reflected waves; wherein the radar level meter obtains a distance measurement value by transmitting radar waves to the reflecting plates and receiving reflected waves, the reflecting plates are arranged at preset reference point positions, and calibration positions are arranged on the reflecting plates and used for calibrating the reflecting plates through calibration signals. The invention further provides a calibration method of the calibration device of the radar level meter with the calibration function. According to the invention, the plurality of reflecting plates are correspondingly arranged at the plurality of preset reference point positions, so that the reflecting plates do not need to be moved in the distance measurement process, each reflecting plate can be rotated to the working calibration position or the non-working calibration position, and the plurality of reflecting plates can be calibrated before calibration so as to meet the calibration requirement. Therefore, the measurement error can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of calibration devices, and in particular to a calibration device and a calibration method for a radar level meter with a calibration function. Background Art

[0002] In the prior art, the radar level meter is usually calibrated in the following way: the radar level meter transmits a radar signal to a movable target plate and receives the reflected signal from the target plate, thereby obtaining the calibration distance according to the distance between the radar level meter and the target plate. The distance between the target plate and the radar level meter is obtained by a measuring device. However, when the range of the radar level meter is large, at least 5 to 10 points of calibration are required during the calibration process of the radar level meter, so the target plate needs to be moved over long distances for many times, but it will be difficult to ensure accuracy during each movement.

[0003] In addition, when the measuring range is large, it is difficult to ensure the verticality of the target plate during movement and operation. For example, the superposition of the verticality error and the measuring range error will cause a large measurement error, resulting in the main lobe of the reflected signal being unable to align with the radar level meter, thereby causing the measurement error of the radar level meter.

[0004] Currently, there is no technology that discloses a solution for calibrating a radar level meter without moving the target plate, and even less a method for calibrating whether a target plate at a preset reference point meets the calibration requirements. Summary of the invention

[0005] The present invention provides a calibration device and a calibration method for a radar level meter with a calibration function, which are used to solve the technical problems that it is difficult to ensure the verticality of an existing target plate during movement and operation, the superposition of the verticality error and the range error will cause a large measurement error in the calibration process of the radar level meter, and there is no calibration function for determining whether the target plate moved to a preset reference point position meets the calibration requirements.

[0006] In order to achieve the above-mentioned object, the present invention provides, on one hand, a calibration device for a radar level meter with a calibration function, comprising a plurality of reflective plates, wherein the plurality of reflective plates are located at opposite sides of the radar level meter, and are used to receive radar waves emitted by the radar level meter and reflect the radar waves to form reflected waves;

[0007] The radar level meter acquires the distance measurement value by transmitting radar waves to the reflector and receiving the reflected waves reflected by the reflector, and a plurality of the reflectors are arranged at a plurality of preset reference point positions;

[0008] The reflector is provided with a calibration position, and the calibration position is used to calibrate the reflector through a calibration signal.

[0009] In a possible implementation of the first aspect of the present invention, the calibration position is provided at an edge of the reflective plate.

[0010] In a possible implementation of the first aspect of the present invention, a scale is provided at the calibration position, and if the calibration signal is within the calibration area calibrated by the scale, it indicates that the reflector currently meets the calibration requirements.

[0011] In a possible implementation of the first aspect of the present invention, a mounting hole is provided on the first or last reflective plate, the mounting hole is used to install a laser, and the laser is used to sequentially transmit calibration signals to calibration positions on the reflective plates where the laser is not installed, so as to calibrate the plurality of reflective plates;

[0012] Alternatively, the laser is disposed on the calibration platform and is used to sequentially transmit calibration signals to calibration positions on a plurality of the reflective plates, so as to calibrate the plurality of the reflective plates.

[0013] In a possible implementation of the first aspect of the present invention, the plurality of reflecting plates are arranged in parallel, and the plurality of reflecting plates are perpendicular to a direction in which radar waves emitted by the radar level meter.

[0014] In a possible implementation of the first aspect of the present invention, when the multiple reflective plates are being calibrated or calibrated, one of the reflective plates is at a working calibration position, and the remaining reflective plates are at non-working calibration positions.

[0015] In a possible implementation of the first aspect of the present invention, the reflective plate is disposed on the fixed bracket, and the reflective plate is rotated on the fixed bracket to the working calibration position or the non-working calibration position via a rotating shaft.

[0016] In a possible implementation of the first aspect of the present invention, the reflective plate is rotated to the working calibration position or the non-working calibration position and the transformation is achieved manually or by a driving component.

[0017] In a possible implementation of the first aspect of the present invention, the driving component is a driving motor.

[0018] In a possible implementation of the first aspect of the present invention, a limiting portion is further included, and the limiting portion is fixedly disposed on the fixing bracket and is used to limit the reflection plate from rotating to the working calibration position.

[0019] In a possible implementation of the first aspect of the present invention, a fixed support plate is provided on the fixed bracket, and the limiting portion, the driving component and the rotating shaft are fixedly provided on the fixed support plate.

[0020] In a possible implementation of the first aspect of the present invention, the fixed bracket includes a first bracket and a second bracket, the first bracket and the second bracket form an angle, and the first bracket or the second bracket and the reflective plate have an angle.

[0021] In a possible implementation of the first aspect of the present invention, the first bracket and the second bracket are arranged perpendicularly and adjacently.

[0022] In a possible implementation of the first aspect of the present invention, an angle between the first bracket or the second bracket and the reflective plate is 45°.

[0023] In a possible implementation of the first aspect of the present invention, the fixed support plate, the limiting portion, the driving component and the rotating shaft are arranged in a space area enclosed by the first bracket and the second bracket.

[0024] In a possible implementation of the first aspect of the present invention, the number of the reflection plates is greater than or equal to the number of the preset reference point positions.

[0025] In a possible implementation of the first aspect of the present invention, a reflector is further included, which is arranged in parallel with the reflective plate and is used to receive and reflect the calibration signal to determine whether the reflective plate meets the calibration requirements.

[0026] Another aspect of the present invention provides a calibration method for a calibration device of a radar level meter, comprising the following steps:

[0027] Calibration positions are provided on multiple reflective plates;

[0028] The laser transmits calibration signals to the calibration positions on the plurality of reflective plates in sequence;

[0029] The calibration position receives the calibration signal, and determines whether the reflector meets the calibration requirements by determining whether the calibration signal is within the calibration area calibrated on the calibration position;

[0030] The position of the reflector that does not meet the calibration requirements is adjusted until it meets the calibration requirements.

[0031] In a possible implementation of another aspect of the present invention, the laser sequentially transmits a calibration signal to the calibration positions on the plurality of reflective plates, comprising the following steps:

[0032] The laser transmits a calibration signal to the current reflector, and the current reflector rotates to a working calibration position, and the remaining reflectors rotate to non-working calibration positions;

[0033] After the calibration of the current reflector is completed, the current reflector is rotated to a non-working calibration position, and the next reflector to be calibrated is rotated to a calibration position;

[0034] Repeat the above steps to complete the laser transmitting the calibration signal to all the calibration positions on the reflective plates.

[0035] The present invention provides a calibration device for a radar level meter with a calibration function, comprising a plurality of reflectors located on the opposite side of the radar level meter, for receiving radar waves emitted by the radar level meter and capable of reflecting the radar waves to form reflected waves; wherein the radar level meter acquires a distance measurement value by emitting radar waves to the reflectors and receiving reflected waves reflected by the reflectors, and the plurality of reflectors are arranged at preset reference point positions, and calibration positions are arranged on the reflectors, and the calibration positions are used to calibrate the reflectors through calibration signals. The present invention also provides a calibration method for a calibration device for a radar level meter with a calibration function. The present invention arranges a plurality of reflectors at a plurality of preset reference point positions correspondingly, so that the reflectors do not need to be moved during the distance measurement process, and each reflector can be rotated to a working calibration position during measurement, and rotated to a non-working calibration position during non-distance measurement, and the plurality of reflectors can be calibrated to meet the calibration requirements before calibration, thereby greatly reducing the measurement error. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 The structure diagram of a calibration device for a radar level meter with a calibration function provided by the present invention is shown in FIG. Figure 1 ;

[0038] Figure 2 The structure diagram of a calibration device for a radar level meter with a calibration function provided by the present invention is shown in FIG. Figure 2 ;

[0039] Figure 3 The structure diagram of a calibration device for a radar level meter with a calibration function provided by the present invention is shown in FIG. Figure 3 ;

[0040] Figure 4 The structure diagram of the reflector plate in the present invention is arranged at the preset reference point position. Figure 1 ;

[0041] Figure 5 yes Figure 4 Schematic diagram of some structures;

[0042] Figure 6 The structure diagram of the reflector plate in the present invention is arranged at the preset reference point position. Figure 2 ;

[0043] Figure 7 It is a schematic diagram of a partial installation structure of a reflector with mounting holes;

[0044] Figure 8 It is a schematic diagram of the partial installation structure of the reflector with a calibration position.

[0045] Summary of reference numerals:

[0046] 1. Radar level meter 2. Reflector 21. Calibration position

[0047] 22. Mounting hole 3, mounting platform 4, fixing bracket

[0048] 41. First bracket 42. Second bracket 5. Fixed support plate

[0049] 6. Rotating shaft 7. Limiting part 8. Driving component

[0050] 9. Mounting base 91. Threaded assembly 92. Support feet DETAILED DESCRIPTION

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementations. It is to be understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as exemplary features that provide various details of some ways in which the technical concept of the present invention can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present invention.

[0054] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0055] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0056] like Figure 1 and 2 As shown, the present invention discloses a calibration device for a radar level meter with a calibration function, including a plurality of reflectors 2, which are all located on the opposite side of a radar level meter 1, and are used to receive radar waves emitted by the radar level meter 1 and can reflect the radar waves to form reflected waves. The radar level meter 1 obtains a distance measurement value by emitting radar waves to the reflectors 2 and receiving reflected waves reflected by the reflectors 2, and the plurality of reflectors 2 are arranged at preset reference point positions. A calibration position 21 is arranged on the reflector 2, and the calibration position 21 is used to calibrate the reflector 2 through a calibration signal.

[0057] Among them, Figure 6 and 8 As shown, the calibration position 21 can be set at the edge of the reflector 2, and the figure shows that there are three calibration positions 21. It should be noted that the number of calibration positions 21 is not specifically limited, and a specific number can be set according to the size of the reflector 2 or the calibration distance.

[0058] Specifically, a scale is provided at the calibration position 21, and the calibration signal is within the calibration area calibrated by the scale, indicating that the current reflector 2 meets the calibration requirements. The scale is drawn on the reflector 2 in advance, usually a plurality of coaxial circles, the first circle is a circle marked with 0, the second circle is a circle marked with 1, and the third circle is a circle marked with 2. It is generally believed that the calibration signal within the circle marked with 1 is a calibration signal that meets the calibration requirements, and at this time, the reflector 2 is a reflector 2 that meets the calibration requirements.

[0059] In the present invention, a plurality of reflectors 2 are provided. In order to calibrate the plurality of reflectors 2 in sequence, a mounting hole 22 is preferably provided on the first or last reflector 2. The mounting hole 22 is used to install a laser. The laser is used to sequentially transmit a calibration signal to the calibration position 21 on the reflector where the laser is not installed, so as to calibrate the plurality of reflectors 2. Alternatively, the laser may be provided on a calibration platform (a platform outside the plurality of reflectors 2) to sequentially transmit a calibration signal to the calibration position 21 on the plurality of reflectors 2, so as to calibrate the plurality of reflectors 2.

[0060] like Figures 4 to 8 As shown, taking five reflectors 2 as an example, a mounting hole 22 is provided on the first or last reflector 2, and calibration positions 21 are provided on the other four reflectors 2. The size of the mounting hole 22 is larger than the size of the calibration position 21. After placing the corresponding five reflectors 2 according to the number of five preset reference point positions, the five reflectors can be calibrated first, and the radar level meter can be calibrated after the calibration meets the calibration requirements.

[0061] It should be noted that the calibration position 21 may be a calibration hole, a calibration point or a calibration ruler, etc., as long as it is used to calibrate the calibration signal to determine whether the position of the reflector 2 meets the calibration requirements.

[0062] First, install a laser on the mounting hole 22 on the reflector 2, and use the laser to sequentially transmit calibration signals (laser signals) to the corresponding calibration positions 21 on the remaining four reflectors 2. If the calibration signal is within the calibration area marked by the scale on the reflector 2, it means that the current reflector 2 meets the calibration requirements. The five reflectors 2 are placed in the order of numbers 1 to 5, and the reflector 2 with the mounting hole 22 is the reflector 2 numbered 1 or the reflector 2 numbered 5. Take the reflector 2 numbered 1 with the mounting hole 22 as an example. After the laser is installed, calibration signals will be sequentially transmitted to the reflectors 2 numbered 2, 3, 4 and 5. If the calibration signals received by each reflector 2 are within the calibration area marked by the scale on its own reflector 2, it means that all reflectors 2 meet the calibration requirements, that is, multiple reflectors 2 are arranged in parallel. If the calibration signal received by one or more reflectors 2 is not within the calibration area calibrated by the scale on the reflector 2 itself, it means that the reflector 2 does not meet the calibration requirements. At this time, it is necessary to adjust the height or horizontal angle and other position information of the current reflector 2 until the calibration requirements are met.

[0063] Alternatively, a laser is installed on a calibration platform, and the calibration platform is located on the opposite side of the first reflector 2 or the last reflector 2. The five reflectors 2 are numbered 1, 2, 3, 4 and 5, respectively. At this time, calibration positions 21 are set on the five reflectors 2. Calibration signals (laser signals) are sequentially transmitted to the corresponding calibration positions 21 on the five reflectors 2 by the laser. If the calibration signal is within the calibration area calibrated by the scale on the reflector 2, it means that the current reflector 2 meets the calibration requirements. The five reflectors 2 are placed in the order of numbers 1 to 5. After the laser is installed on the calibration platform, calibration signals will be transmitted to the reflectors 2 numbered 1, 2, 3, 4, 5 or 5, 4, 3, 2 and 1 in turn. If the calibration signals received by each reflector 2 are within the calibration area calibrated by the scale on its own reflector 2, it means that all reflectors 2 meet the calibration requirements, that is, multiple reflectors 2 are arranged in parallel. If the calibration signal received by one or more reflectors 2 is not within the calibration area calibrated by the scale on the reflector 2 itself, it means that the reflector 2 does not meet the calibration requirements. At this time, it is necessary to adjust the height or horizontal angle and other position information of the current reflector 2 until the calibration requirements are met.

[0064] Since at least 5 to 10 points need to be calibrated during the calibration process of the radar level meter 1, in order to meet the distance measurement under different distance conditions such as short distance or long distance, the number of the reflective plates 2 is set to be greater than or equal to the number of the preset reference point positions in the present invention, thereby meeting the requirement of selecting the same number of reflective plates 2 as the number of the preset reference point positions at different measurement distances.

[0065] For example, when the measuring distance is 25m, you can choose to set 5 reflectors 2 at distances of 5m, 10m, 15m, 20m, and 25m respectively, and the 5 reflectors 2 just correspond to the 5 preset reference point positions; when the measuring distance is 15m, you can choose to set 5 reflectors 2 at distances of 3m, 6m, 9m, 12m, and 15m respectively, at this time, the preset reference point position corresponding to the distance of 15m can choose the reflector 2 when the measuring distance is 25m; when the measuring distance is 50m, you can choose to set 6 reflectors 2 at distances of 5m, 10m, 20m, 30m, 40m, and 50m respectively, at this time, the preset reference point position corresponding to the distance of 5m, 10m, and 20m can choose the reflector 2 when the measuring distance is 25m.

[0066] In the present invention, a group of reflective plates 2 with the same structure is provided, and a group of reflective plates 2 with the same structure is a plurality of reflective plates 2. During the calibration or calibration of the radar level meter 1, the reflective plates 2 with a suitable number and spacing can be selected according to the number of preset reference point positions and the measurement distance.

[0067] For example, a larger number of reflectors 2 may be provided for long-distance measurement, and a portion of the reflectors 2 may be selected for distance measurement in subsequent close-distance measurement, where the positions of the reflectors 2 correspond to the current preset reference point positions.

[0068] In order to ensure the accuracy of the distance measurement value and avoid the distance measurement error caused by moving the reflector 2 during the measurement process, a plurality of reflectors 2 are provided in the present invention, and the plurality of reflectors 2 are arranged in parallel and perpendicular to the direction in which the radar wave is emitted by the radar level meter 1.

[0069] During the calibration of the radar level meter: In the present invention, a plurality of reflectors 2 are provided. During the calibration of the radar level meter 1, the radar level meter 1 will sequentially transmit radar waves to the plurality of reflectors 2 at the positions of the plurality of preset reference points, and preferably, the calibration sequence is performed sequentially. When the plurality of reflectors 2 are calibrating the radar level meter 1, one of the reflectors 2 is at the working calibration position, and the remaining reflectors 2 are at the non-working calibration position. Among them, the reflector 2 at the working calibration position is perpendicular to the direction in which the radar level meter 1 transmits the radar wave, and is used to receive the radar wave and reflect it; the reflector 2 at the non-working calibration position is parallel or nearly parallel to the direction in which the radar level meter 1 transmits the radar wave, and this position does not receive radar waves and does not reflect radar waves.

[0070] Among them, taking the example that five reflectors 2 are arranged in sequence from near to far from the radar level meter 1, the five reflectors 2 are numbered 1, 2, 3, 4, and 5 respectively, and the five reflectors 2 numbered 1 to 5 are arranged at five preset reference point positions in sequence. During the calibration process, the radar level meter 1 first transmits radar waves to the reflector 2 numbered 1. At this time, the reflector 2 numbered 1 is located at the working calibration position, and the other reflectors 2 numbered 2 to 5 are located at the non-working calibration positions; after the radar level meter 1 receives the reflected wave reflected by the reflector 2 numbered 1, the reflector 2 numbered 1 is rotated to the non-working calibration position under the drive of the driving motor or manually, and the reflector 2 numbered 2 is rotated to the working calibration position at the same time, and the reflectors 2 numbered 3 to 5 are kept at the non-working calibration position; this principle is followed until the radar level meter 1 receives the reflected wave reflected by the reflector 2 numbered 5. At this time, the radar level meter 1 will receive 5 distance measurement values, and calibrate the radar level meter 1 by analyzing and comparing the 5 distance measurement values ​​with 5 preset distance standard values. The distance standard value can be measured by a distance measuring device, which can be a high-precision distance measuring device such as a grating ruler.

[0071] During the calibration process of the calibration device of the radar level meter 1: In the present invention, a plurality of reflectors 2 are provided, and during the calibration process of the calibration device of the radar level meter 1, it is preferred to perform the calibration in sequence. When the plurality of reflectors 2 are calibrating the calibration device of the radar level meter 1, one of the reflectors 2 is at a working calibration position, and the remaining reflectors 2 are at a non-working calibration position.

[0072] Among them, taking the example of 5 reflectors 2 arranged in sequence from near to far from the radar level meter 1, the 5 reflectors 2 are numbered 1, 2, 3, 4, and 5 respectively, and the 5 reflectors 2 numbered 1 to 5 are arranged at 5 preset reference point positions in sequence. During the calibration process, the laser first transmits a calibration signal to the reflector 2 numbered 1. At this time, the reflector 2 numbered 1 is located at the working calibration position, and the other reflectors 2 numbered 2 to 5 are located at the non-working calibration position; after the reflector 2 numbered 1 receives the calibration signal, it is manually observed whether the calibration signal received by the reflector 2 numbered 1 is in If the reflector 2 is within the calibration area marked by the scale on its own reflector 2, it means that the current reflector 2 meets the calibration requirements. At this time, the reflector 2 numbered 1 is rotated to the non-working calibration position under the drive of the driving motor or manually, and the reflector 2 numbered 2 is rotated to the working calibration position. At this time, the reflectors 2 numbered 3 to 5 remain in the non-working calibration position; according to this principle, the calibration signals received by all reflectors 2 numbered 1 to 5 are within the calibration area marked by the scale on their own reflectors 2. At this time, the calibration requirements are met, that is, multiple reflectors 2 are arranged in parallel.

[0073] The present invention provides a calibration device for a radar level meter 1 with a calibration function, comprising a plurality of reflectors 2, which are all located on the opposite side of the radar level meter 1, and are used to receive radar waves emitted by the radar level meter 1 and reflect the radar waves to form reflected waves; wherein the radar level meter 1 acquires distance measurement values ​​by emitting radar waves to the reflectors 2 and receiving reflected waves reflected by the reflectors 2, and the plurality of reflectors 2 are arranged at preset reference point positions; calibration positions 21 are arranged on the reflectors 2, and the calibration positions 21 are used to calibrate the reflectors 2 through calibration signals. The present invention provides a plurality of reflectors 2 at a plurality of preset reference point positions, thereby eliminating the need to move the reflectors 2 during distance measurement, and each reflector 2 can be rotated to a working calibration position during measurement, and rotated to a non-working calibration position during non-distance measurement, and multiple reflectors can be calibrated to meet calibration requirements before calibration, thereby greatly reducing measurement errors.

[0074] like Figures 1 to 3 As shown, during the calibration process of the radar level meter 1, the radar level meter 1 needs to be placed on the mounting platform 3. In order to allow the radar waves emitted by the radar level meter 1 to be received and emitted by the reflector 2, the reflector 2 is correspondingly placed on the fixed bracket 4. The reflector 2 is rotated on the fixed bracket 4 to the working calibration position or the non-working calibration position through the rotating shaft 6.

[0075] During the calibration process of the radar level meter 1 or the calibration process of the calibration device, the reflector 2 rotates to the working calibration position or the non-working calibration position, which can be switched manually or by the driving component 8. Among them, a limiting portion 7 can be fixedly set on the fixed bracket 4, and the reflector 2 is switched from the non-working calibration position to the working calibration position by rotating the reflector 2 to the position where the limiting portion 7 is limited. Since the stability of the position of the reflector 2 needs to be ensured during the distance measurement process, and the distance error generated by moving the reflector 2 to multiple preset reference point positions in the prior art is overcome, the working calibration position is mechanically limited by the setting of the limiting portion 7, so that the reflector 2 is only movable within a limited range. Compared with the scheme of measuring the distance by moving one reflector 2 to multiple preset reference point positions in the prior art, the present invention sets multiple parallel reflectors 2 at multiple preset reference point positions, calibrates the position in advance through the system, does not move the reflector 2 during the measurement process, and only rotates the reflector 2 to achieve distance measurement at multiple preset reference point positions.

[0076] The calibration device of the radar level meter may also include a reflector, which is arranged in parallel with the reflector 2 and is used to receive and reflect the calibration signal, and determine whether the reflector 2 meets the calibration requirements according to the position of the reflected calibration signal. For example, after the reflector is installed, if the calibration signal has a positional offset of 1mm, the calibration signal received after being reflected by the reflector will have a positional offset of 2mm. Among them, the reflected calibration signal can be received by setting a calibration position at the position range where the laser emits the calibration signal. For example, a calibration position can be set at the position where the laser emits the calibration signal, and a ruler is set on the calibration position. The reflected calibration signal is within the calibration area range calibrated by the ruler, indicating that the current reflector 2 meets the calibration requirements. The ruler is drawn on the reflector 2 in advance, usually a plurality of coaxial circles, the first circle is a circle marked as 0, the second circle is a circle marked as 1, and the third circle is a circle marked as 2. It is generally believed that the calibration signal within the range of the circle marked as 1 is a calibration signal that meets the calibration requirements. At this time, the reflector 2 is a reflector 2 that meets the calibration requirements. It should be noted that since the calibration signal reflected by the reflector will be amplified, the calibration signal reflected by the reflector can be considered as the calibration signal within the circle marked as 2 as the calibration signal that meets the calibration requirements. This setting can achieve signal amplification of the calibration signal that the reflector 2 that does not meet the calibration requirements should receive through the reflector, thereby making it easier to obtain the offset position of the reflector 2, and then adjust the position in a targeted manner to meet the calibration requirements.

[0077] The above-mentioned limiter 7 is mainly used to limit the reflector 2 when it rotates from the non-working calibration position to the working calibration position, and the rotation from the non-working calibration position to the working calibration position can also be achieved by the limiter, or by controlling the rotation angle by the control module. The limiter at the non-working calibration position is hidden in the space area surrounded by the first bracket 41 and the second bracket 42, so that it will not receive radar waves and will not affect the distance measurement during the calibration process.

[0078] It should be noted that the above-mentioned limiter 7 can also be a limiter electronic switch, that is, an electronic switch component, or the limiter 7 is combined with a limiter electronic component to realize the limiter function. For example, the electronic switch component can be a photoelectric switch component, a capacitive proximity switch component, an inductive proximity switch component, etc.

[0079] In order to realize intelligent driving of the reflection plate 2 to rotate, the reflection plate 2 may be rotated by a driving component 8 , and preferably, the driving component 8 may be a driving motor.

[0080] Specifically, Figure 2 and 4 As shown in Figure 8, the fixed bracket 4 includes a first bracket 41 and a second bracket 42, the first bracket 41 and the second bracket 42 form an angle, and the first bracket 41 or the second bracket 42 has an angle with the reflector 2. The fixed bracket 4 is provided with a fixed support plate 5, the limit portion 7, the driving component 8 and the rotating shaft 6 are fixedly arranged on the fixed support plate 5, and the fixed support plate 5, the limit portion 7, the driving component 8 and the rotating shaft 6 are arranged in the space area surrounded by the first bracket 41 and the second bracket 42.

[0081] 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 angle space area enclosed by the first bracket 41 and the second bracket 42. The fixed support plate 5 is provided with a rotating shaft 6, a driving motor, and a limit part 7 for driving the reflection plate 2 to rotate.

[0082] In order to prevent the radar level meter 1 from receiving the reflected waves of the radar waves emitted to the reflector 2 and reflected by other objects, it is preferably necessary to set the first bracket 41 and the second bracket 42 perpendicularly and adjacently, and the angle between the first bracket 41 or the second bracket 42 and the reflector 2 is 45°. When measuring the distance, the reflector 2 is rotated to a position at 45° with the first bracket 41 or the second bracket 42, which is perpendicular to the direction in which the radar level meter 1 emits the radar waves. At this position, from the direction in which the radar level meter 1 emits the radar waves, only the first bracket 41, the second bracket 42 and the reflector 2 can be seen, and other components (fixed support plate 5, drive motor or rotating shaft 6) cannot be seen.

[0083] In the present 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 meter 1 transmits the radar wave perpendicularly to the reflector 2, it will only receive the reflected wave reflected by the reflector 2. At this time, if the first bracket 41 or the second bracket 42 receives a part of the radar wave, it will reflect a reflected wave parallel to the reflector 2. The reflected wave parallel to the reflector 2 is perpendicular to the reflected wave perpendicular to the reflector 2 reflected by the reflector 2. The radar level meter 1 will not receive the reflected wave reflected by the first bracket 41 or the second bracket 42, thereby making the distance measurement value more accurate.

[0084] When the reflector 2 is placed at the preset reference point, position calibration is required. During calibration, the height or horizontal angle of the reflector 2 may need to be adjusted. For this purpose, a mounting base 9 may 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 is adjusted by a threaded assembly 91 on the mounting base 9.

[0085] like Figure 1 , 2 As shown in , 4 and 6, a threaded component 91 can be provided around or on the side of the mounting base 9, and the threaded component 91 is fixedly provided on a supporting foot 92. The supporting foot 92 and the mounting base 9 are movably connected through the threaded component 91 to achieve adjustment of the height or position of the fixed bracket 4.

[0086] The calibration method of the radar level meter with calibration function of the present invention comprises the following steps:

[0087] The radar level meter 1 transmits radar waves;

[0088] Reflecting radar waves by the reflector 2 correspondingly arranged at each preset reference point;

[0089] The radar level meter 1 receives reflected waves reflected by the reflector 2 at a plurality of preset reference point positions to obtain a plurality of distance measurement values ​​at the plurality of preset reference point positions;

[0090] The radar level meter 1 is calibrated by using a plurality of distance measurement values ​​and a plurality of preset distance standard values.

[0091] During the calibration process of the radar level meter 1, the radar level meter 1 needs to be placed on the mounting platform 3. In order to allow the radar waves emitted by the radar level meter 1 to be received and emitted by the reflector 2, the reflector 2 is correspondingly placed on the fixed bracket 4. The reflector 2 is rotated on the fixed bracket 4 to the working calibration position or the non-working calibration position through the rotating shaft 6.

[0092] The reflector 2 can be rotated to the working calibration position or the non-working calibration position by manual switching or by a driving component 8. A limiting portion 7 can be fixedly set on the fixed bracket 4, and the reflector 2 can be rotated to the position where the limiting portion 7 is limited to switch from the non-working calibration position to the working calibration position. Since the stability of the position of the reflector 2 during measurement needs to be ensured, and the distance error generated by moving the reflector 2 to multiple preset reference point positions needs to be overcome, the working calibration position is mechanically limited by setting the limiting portion 7, so that the reflector 2 can only move within a limited range. Compared with the technology of measuring the distance by moving a reflector 2 to multiple preset reference point positions in the prior art, the present invention sets multiple parallel reflectors 2 at the preset reference point positions, calibrates the position in advance through the system, does not move the reflector 2 during the measurement process, and only rotates the plate to achieve distance measurement at multiple preset reference point positions.

[0093] The radar level meter 1 receives the reflected waves reflected by the reflector 2 at the positions of the multiple preset reference points to obtain the multiple distance measurement values ​​at the positions of the multiple preset reference points, including the following steps:

[0094] The plurality of reflective plates 2 are arranged at the corresponding preset reference point positions according to the calibration order;

[0095] Controlling the plurality of reflective plates 2 to rotate to working calibration positions in sequence according to the calibration sequence;

[0096] The radar level gauge 1 receives a plurality of distance measurement values ​​and records them.

[0097] It should be noted that in the present invention, the control device can be used to control the driving motor to rotate the reflecting plate 2 to the working calibration position in sequence. After the reflected wave reflected by the current reflecting plate 2 is received by the radar level meter 1, the control device controls the driving motor to rotate the current reflecting plate 2 to the non-working calibration position after receiving the reflected wave signal, and at the same time rotates the adjacent reflecting plate 2 to the working calibration position, and follows this step until the reflected wave signals at all preset reference point positions are obtained.

[0098] Since at least 5 to 10 points of calibration are required during the calibration process of the radar level meter 1. As described below, taking the five reflectors 2 numbered 1 to 5 and the five preset reference point positions as an example, the control device can simultaneously communicate with the radar level meter 1 and the drive component, and control the radar level meter 1 to sequentially receive the reflected wave signals reflected by the reflector 2, for example, rotating the corresponding reflector 2 in the order of number 1, number 2, number 3, number 4, number 5, number 5, number 4, number 3, number 2, and number 1 to the working calibration position for distance measurement. Of course, the corresponding reflector 2 can also be rotated in the order of number 1, number 1, number 2, number 2, number 3, number 3, number 4, number 4, number 5, number 5, etc. to the working calibration position for distance measurement.

[0099] In order to ensure that the distance measurement values ​​obtained are more accurate, at least 2 distance measurement values ​​need to be obtained at each preset reference point position, preferably 5 distance measurement values ​​need to be obtained at each preset reference point position, and then the radar level meter 1 is calibrated with the preset distance standard value.

[0100] However, in order to obtain more accurate multiple distance measurement values, calibration is required before the radar level meter is calibrated. Specifically, the calibration method of the calibration device of the radar level meter includes the following steps:

[0101] A calibration position 21 is provided on each of the plurality of reflective plates 2;

[0102] The laser transmits calibration signals to the calibration positions 21 on the plurality of reflective plates 2 in sequence;

[0103] The calibration position 21 receives the calibration signal, and determines whether the reflector 2 meets the calibration requirements by determining whether the calibration signal is within the calibration area calibrated on the calibration position 21;

[0104] The position of the reflector 2 that does not meet the calibration requirements is adjusted until it meets the calibration requirements.

[0105] The laser sequentially transmits calibration signals to the calibration positions 21 on the plurality of reflective plates 2, including the following steps:

[0106] The laser transmits a calibration signal to the current reflector 2, and the current reflector 2 rotates to a working calibration position, and the other reflectors 2 rotate to non-working calibration positions;

[0107] After the calibration of the current reflector 2 is completed, the current reflector 2 is rotated to the non-working calibration position, and the next reflector 2 to be calibrated is rotated to the calibration position;

[0108] The above steps are repeated to complete the laser transmitting the calibration signal to all the calibration positions 21 on the reflective plates 2 .

[0109] The present invention sets a plurality of reflective plates 2 at a plurality of preset reference point positions, thereby eliminating the need to move the reflective plates 2 during distance measurement, and each reflective plate 2 can be rotated to a working calibration position during measurement, and rotated to a non-working calibration position during non-distance measurement, and the plurality of reflective plates 2 are calibrated before calibration to meet the calibration requirements, thereby greatly reducing measurement errors.

[0110] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0111] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0112] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A calibration device for a radar level meter with a calibration function, characterized in that: It comprises a plurality of reflecting plates, which are all located at the opposite side of the radar level meter and are used to receive radar waves emitted by the radar level meter and reflect the radar waves to form reflected waves; Wherein, the radar level meter acquires the distance measurement value by transmitting radar waves to the reflector and receiving the reflected waves reflected by the reflector, and a plurality of the reflectors are arranged at a plurality of preset reference point positions; The reflector is provided with a calibration position, and the calibration position is used to calibrate the reflector through a calibration signal.

2. The calibration device of the radar level meter with calibration function according to claim 1, characterized in that: The calibration position is arranged at the edge of the reflection plate.

3. The calibration device of the radar level meter with calibration function according to claim 1, characterized in that: A scale is provided at the calibration position, and if the calibration signal is within the calibration area calibrated by the scale, it indicates that the current reflector meets the calibration requirements.

4. The calibration device of the radar level meter with calibration function according to claim 1, characterized in that: A mounting hole is provided on the first or last reflective plate, the mounting hole is used to install a laser, and the laser is used to sequentially transmit calibration signals to calibration positions on the reflective plates where the laser is not installed, so as to calibrate multiple reflective plates; Alternatively, the laser is disposed on the calibration platform and is used to sequentially transmit calibration signals to calibration positions on a plurality of the reflective plates, so as to calibrate the plurality of the reflective plates.

5. The calibration device of the radar level meter with calibration function according to claim 1, characterized in that: The plurality of reflecting plates are arranged in parallel, and the plurality of reflecting plates are perpendicular to the direction in which the radar waves emitted by the radar level meter are emitted.

6. The calibration device of the radar level meter with calibration function according to claim 1, characterized in that: When the multiple reflectors are being calibrated or calibrated, one of the reflectors is at a working calibration position, and the other reflectors are at a non-working calibration position; Preferably, the reflective plate is arranged on the fixed bracket, and the reflective plate is rotated on the fixed bracket to the working calibration position or the non-working calibration position through a rotating shaft; Preferably, the reflector plate is rotated to the working calibration position or the non-working calibration position to achieve the transformation manually or through a driving component; Preferably, the driving component is a driving motor; Preferably, it further comprises a limiting portion, which is fixedly arranged on the fixing bracket and is used to limit the rotation of the reflecting plate to the working calibration position; Preferably, a fixed support plate is provided on the fixed bracket, and the limiting portion, the driving component and the rotating shaft are fixedly arranged on the fixed support plate.

7. The calibration device of the radar level meter with calibration function according to claim 6, characterized in that: The fixed bracket includes a first bracket and a second bracket, the first bracket and the second bracket form an angle, and the first bracket or the second bracket and the reflective plate have an angle; Preferably, the first bracket is perpendicular to and adjacent to the second bracket; Preferably, the angle between the first bracket or the second bracket and the reflector is 45°; Preferably, the fixed support plate, the limiting portion, the driving component and the rotating shaft are arranged in a space area enclosed by the first bracket and the second bracket.

8. The calibration device of the radar level meter with calibration function according to claim 1, characterized in that: The number of the reflection plates is greater than or equal to the number of the preset reference point positions.

9. The calibration device of the radar level meter with calibration function according to claim 4, characterized in that: It also includes a reflector, which is arranged in parallel with the reflector plate and is used to receive and reflect the calibration signal, and determine whether the reflector plate meets the calibration requirements according to the position of the reflected calibration signal.

10. A calibration method for a calibration device of a radar level meter with a calibration function, characterized in that: The steps include: Calibration positions are provided on multiple reflective plates; The laser transmits calibration signals to the calibration positions on the plurality of reflective plates in sequence; The calibration position receives the calibration signal, and determines whether the reflector meets the calibration requirements by determining whether the calibration signal is within the calibration area calibrated on the calibration position; Adjusting the position of the reflector that does not meet the calibration requirements until it meets the calibration requirements; The laser sequentially transmits calibration signals to the calibration positions on the plurality of reflective plates, comprising the following steps: The laser transmits a calibration signal to the current reflector, and the current reflector rotates to a working calibration position, and the remaining reflectors rotate to non-working calibration positions; After the calibration of the current reflector is completed, the current reflector is rotated to a non-working calibration position, and the next reflector to be calibrated is rotated to a calibration position; Repeat the above steps to complete the laser transmitting the calibration signal to all the calibration positions on the reflective plates.

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