Hand-held laser range finder verification method and device

Abstract

The invention provides a handheld laser range finder verification method. The clamping mechanism is used for installing the range finder on the rotating disc so as to adjust the circumferential position along with rotation of the rotating disc. The standard ruler is arranged at the preset position of the turntable, and when the range finder rotates to the preset position along with the turntable, the range finder and the standard ruler are collinear, so that the range finder can detect the distance of the detection point. As data measured in the inclination state of the range finder can generate errors, the multi-degree-of-freedom adjustment of the clamping mechanism is the step of leveling the range finder, and laser emitted by the range finder can be parallel to the standard ruler, so that the errors can be eliminated or reduced, and the calibration precision is improved. And the plurality of clamping mechanisms can clamp the plurality of range finders, so that the plurality of range finders can be calibrated at the same time when the turntable rotates for one circle, and the calibration efficiency and the calibration precision can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of surveying equipment technology, and in particular to a method and apparatus for calibrating a handheld laser rangefinder. Background Technology

[0002] Currently, the calibration process for handheld laser rangefinders faces the following technical challenges: Traditional calibration methods typically employ a single, fixed installation, making continuous testing of the rangefinder at multiple angles impossible, resulting in low calibration efficiency. Existing clamping mechanisms lack multi-degree-of-freedom adjustment capabilities; when the rangefinder is tilted, its laser emission axis is not parallel to the standard ruler, leading to significant measurement errors and severely impacting calibration accuracy. Furthermore, most existing technologies can only calibrate one device at a time. When batch calibration is required, repeated disassembly and reassembly of the rangefinder are necessary, which is not only cumbersome but also introduces new errors due to repeated positioning.

[0003] The main drawbacks of the existing technology include: the inability to continuously adjust the circumferential position of the rangefinder, making it difficult to comprehensively test the measurement performance at different angles; the lack of an effective leveling mechanism, which cannot guarantee the parallelism between the laser emission axis and the standard ruler; the limited number of devices that can be calibrated at one time, resulting in low calibration efficiency; and the tendency for repeated disassembly and assembly to lead to positioning errors, affecting the reliability of the calibration results.

[0004] Therefore, there is an urgent need to develop a new type of handheld laser rangefinder calibration device and method to solve the above-mentioned technical problems and improve calibration efficiency and accuracy. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a handheld laser rangefinder calibration method that overcomes or at least partially solves the above problems. It can solve the problems of low efficiency and low accuracy of existing calibration methods and equipment for rangefinder calibration, thereby improving the calibration efficiency of rangefinders.

[0006] Specifically, the present invention provides a method for calibrating a handheld laser rangefinder, the method comprising:

[0007] Multiple laser rangefinders of different models to be tested are mounted on clamping mechanisms evenly distributed around the circumference of the turntable; and multiple detection points are set along the standard ruler.

[0008] The rangefinder is adjusted to a horizontal position by adjusting the multi-degree-of-freedom clamping mechanism;

[0009] When all the detectors are adjusted to a horizontal position, the turntable rotates in increments to move the rangefinder to a preset inspection position, so that the rangefinder can obtain the distance to the inspection point.

[0010] The turntable is then rotated multiple times to drive each rangefinder to pass through the detection position multiple times, thereby obtaining the distance of each rangefinder to each detection point.

[0011] Obtain the error value of the standard distance corresponding to each of the rangefinders and the plurality of detection points;

[0012] A calibration report is generated based on multiple error values ​​for each of the rangefinders.

[0013] Optionally, each detection point is provided with a detection baffle that can be retracted and unfolded; the plurality of detection baffles and the clamping mechanism are, from near to far, the first baffle, the second baffle, the third baffle... the nth baffle;

[0014] The step of rotating the turntable multiple times to drive each rangefinder to pass through the detection position multiple times, thereby obtaining the distance of the rangefinder to each detection point, includes:

[0015] During the first rotation of the turntable, all the rangefinders acquire the distance to the first baffle, which is recorded as the first detection distance;

[0016] After the turntable rotates one revolution, the first baffle retracts and the second baffle unfolds.

[0017] The turntable rotates again, and all the rangefinders acquire the distance to the second baffle, which is recorded as the second detection distance;

[0018] Repeat the above steps to obtain the third detection distance...the nth detection distance.

[0019] This invention provides a handheld laser rangefinder calibration device for use with any of the handheld laser rangefinder calibration methods described above. The handheld laser rangefinder calibration device includes:

[0020] Mounting frame, wherein a standard ruler is provided on the mounting frame and the standard ruler extends in the front-to-back direction;

[0021] A turntable, which is rotatably mounted on the mounting bracket and located in front of the standard ruler;

[0022] Multiple clamping mechanisms are disposed on the turntable and rotate under the drive of the turntable; the multiple clamping mechanisms are evenly distributed circumferentially along the axis of the turntable; each clamping mechanism is connected to a horizontal adjustment component, which is used to adjust the rangefinder to a horizontal state when the rangefinder is installed on the clamping mechanism;

[0023] Multiple detection baffles are arranged at intervals along the standard ruler; the detection baffles are rotatably arranged so that they have an unfolded state and a retracted state.

[0024] Optionally, the leveling assembly includes an adjustment plate, a first adjustment part, a second adjustment part, a sensor level, and a mounting box;

[0025] The mounting box is disposed on the turntable; the adjusting plate is disposed on the mounting box; the clamping mechanism is mounted on the adjusting plate; the first adjusting part and the second adjusting part are mounted on the mounting box and are respectively located at both ends of the adjusting plate; the first adjusting part and the second adjusting part are used to adjust the height of both ends of the adjusting plate respectively; the sensing level is connected to the first adjusting part and the second adjusting part and is used to detect the horizontal state of the rangefinder on the clamping mechanism so that the first adjusting part and the second adjusting part can make corresponding adjustments to the adjusting plate.

[0026] Optionally, the clamping mechanism includes two clamping components; the two clamping components are symmetrically arranged about the center line of the front and rear extension of the adjustment plate.

[0027] The clamping assembly includes a clamping plate, a fixing plate, and multiple elastic elements; the fixing plate is fixedly disposed on the adjusting plate; the elastic elements are disposed on the fixing plate; the clamping plate is connected to the fixing plate through the elastic elements; the two clamping plates are parallel to each other, and when the turntable rotates to a preset position, the clamping plate is parallel to the standard ruler.

[0028] Optionally, the first adjustment part includes two adjustment screws, two adjustment gears, and a drive part;

[0029] The adjusting screw is slidably inserted into the mounting box, and its upper end is hinged to the adjusting plate shaft. The adjusting gear is rotatably mounted on the mounting box and sleeved on the adjusting screw, and threadedly connected to the adjusting screw, so as to drive the adjusting screw to move up and down when the adjusting gear rotates. The driving unit is located inside the mounting box and connected to the adjusting gear, for driving the adjusting gear to rotate. The driving unit is connected to the sensing level.

[0030] The first adjustment part and the second adjustment part have the same structure.

[0031] Optionally, the inductive level includes a connecting frame, an inductive tube, and a steel ball;

[0032] The connecting frame is fixedly mounted on the clamping mechanism; the sensing tube has a hollow internal structure, is hinged to the connecting frame, and is located above the rangefinder; the axis of the sensing tube is parallel to the clamping plate; a first sensing plate and a second sensing plate are respectively provided at both ends of the sensing tube; the first sensing plate is connected to the first sensing part so that the first sensing part is activated when the first sensing plate is triggered; the second sensing plate is connected to the second sensing part so that the second sensing part is activated when the second sensing plate is triggered; the steel ball is placed inside the sensing tube so that the steel ball rolls inside the sensing tube when the sensing tube is tilted.

[0033] Optionally, both the first and second sensing plates are two motor plates; when the steel ball contacts the two electrode plates of the first or second sensing plate simultaneously, a circuit is formed.

[0034] Optionally, the inductive level also includes a leveling pad;

[0035] The horizontal pad is fixed to the sensing tube and is located below the sensing tube; the lower surface of the horizontal pad has a horizontal surface perpendicular to the sensing tube.

[0036] Optionally, the drive unit includes a drive motor and an adjusting rack; the adjusting rack is slidably disposed in the mounting box in the left-right direction; the adjusting rack is a double-sided rack structure, one side of the adjusting rack meshes with two adjusting gears; the drive motor is fixedly disposed on the mounting box, and a drive gear is fixed on the output shaft of the drive motor; the drive gear meshes with the other side of the adjusting rack.

[0037] In a handheld laser rangefinder calibration method of the present invention, a clamping mechanism is used to mount the rangefinder on a turntable, adjusting its circumferential position as the turntable rotates. A standard ruler is set at a preset position on the turntable. When the rangefinder rotates to the preset position with the turntable, the rangefinder and the standard ruler are collinear, thereby enabling the rangefinder to calibrate the distance to the test point. Since data measured when the rangefinder is tilted will produce errors, the clamping mechanism, through multi-degree-of-freedom adjustment, is a step in leveling the rangefinder, ensuring that the laser emitted by the rangefinder is parallel to the standard ruler, thereby eliminating or reducing errors and improving calibration accuracy. Multiple clamping mechanisms can clamp multiple rangefinders, so multiple rangefinders can be calibrated simultaneously with one rotation of the turntable, greatly improving calibration efficiency and accuracy.

[0038] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0039] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0040] Figure 1 This is a schematic flowchart of a handheld laser rangefinder calibration method according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic structural diagram of a handheld laser rangefinder calibration device according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic partial structural diagram of a handheld laser rangefinder calibration device according to an embodiment of the present invention;

[0043] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0044] Figure 5 This is a schematic internal structural diagram of the horizontal adjustment component in a handheld laser rangefinder calibration device according to an embodiment of the present invention.

[0045] Figure 6 This is a schematic structural diagram of the induction tube in a handheld laser rangefinder calibration device according to an embodiment of the present invention.

[0046] In the diagram: 100, mounting bracket; 110, standard ruler; 120, detection baffle; 130, turntable; 200, clamping mechanism; 210, clamping plate; 220, fixing plate; 230, elastic element; 300, leveling adjustment assembly; 310, adjusting plate; 320, first adjusting part; 321, adjusting screw; 322, adjusting gear; 323, drive motor; 324, adjusting rack; 330, second adjusting part; 340, inductive level; 341, connecting bracket; 342, sensing tube; 343, steel ball; 344, first sensing plate; 345, second sensing plate; 346, leveling pad; 350, mounting box. Detailed Implementation

[0047] The following reference Figures 1 to 6This invention describes a handheld laser rangefinder calibration method according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0048] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Figure 1 This is a schematic structural diagram of the calibration method for handheld laser rangefinders, such as... Figure 1As shown, and refer to Figures 2 to 6 This invention provides a method for calibrating a handheld laser rangefinder, which includes:

[0052] S100: Install various laser rangefinders of different models to be tested on the circumferentially distributed clamping mechanism 200 of the turntable 130; and set multiple detection points along the standard ruler 110;

[0053] S200: The rangefinder is adjusted to a horizontal position by adjusting the multi-degree-of-freedom adjustment of the clamping mechanism 200.

[0054] S300. When all detectors are adjusted to a horizontal position, the turntable 130 rotates in increments to move the rangefinder to the preset inspection position so that the rangefinder can obtain the distance to the inspection point.

[0055] S400, then rotate the turntable 130 multiple times to drive each rangefinder to pass through the detection position multiple times, thereby obtaining the distance of each detection point corresponding to the rangefinder.

[0056] S500: Obtain the error value of the standard distance between each rangefinder and multiple detection points;

[0057] S600 generates a calibration report based on multiple error values ​​for each rangefinder.

[0058] Specifically, the clamping mechanism 200 is used to mount the rangefinder on the turntable 130 so as to adjust its circumferential position as the turntable 130 rotates. The standard ruler 110 is set at a preset position on the turntable 130. When the rangefinder rotates to the preset position with the turntable 130, the rangefinder and the standard ruler 110 are collinear, thereby enabling the rangefinder to verify the distance of the detection point.

[0059] Furthermore, since the data measured by the rangefinder in a tilted state will produce errors, the clamping mechanism 200 is a step in leveling the rangefinder through multi-degree-of-freedom adjustment, which can make the laser emitted by the rangefinder parallel to the standard ruler 110, thereby eliminating or reducing errors and improving the calibration accuracy.

[0060] Furthermore, the multiple clamping mechanisms 200 can clamp multiple rangefinders, so the turntable 130 can simultaneously calibrate multiple rangefinders in one rotation, thereby greatly improving calibration efficiency and accuracy.

[0061] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, each detection point is equipped with a detection baffle 120 that can be retracted and extended. The multiple detection baffles 120 and the clamping mechanism 200 are, from near to far, the first baffle, the second baffle, the third baffle... the nth baffle.

[0062] The step of rotating the turntable 130 multiple times to drive each rangefinder to pass through the detection position multiple times, thereby obtaining the distance of the rangefinder to each detection point, includes:

[0063] During the first rotation of S410 and turntable 130, all rangefinders acquire the distance to the first baffle, which is recorded as the first detection distance;

[0064] S420: After the turntable 130 rotates one full turn, the first baffle retracts and the second baffle unfolds.

[0065] S430 and turntable 130 rotate again, and all rangefinders acquire the distance to the second baffle, which is recorded as the second detection distance;

[0066] S440. Repeat the above steps to obtain the third detection distance...the nth detection distance.

[0067] Specifically, each indexing rotation of the turntable 130 rotates a clamping mechanism 200 to a preset position. The detection baffle 120 and the turntable 130 are electrically connected so that when the turntable 130 rotates one full revolution, the detection baffle 120 on the front side retracts, and the rangefinder remeasures the distance to the next detection baffle 120, and so on, obtaining n measured distances. The error value between the measured distance and the size of the standard ruler 110 corresponding to the corresponding detection baffle 120 is used to obtain multiple error values. In other words, each rangefinder corresponds to multiple error values ​​to reflect its error status, thereby increasing the reliability of the calibration.

[0068] This invention provides a handheld laser rangefinder calibration device, such as... Figures 2 to 6 As shown, the handheld laser rangefinder calibration device used in any of the above embodiments includes a mounting frame 100, a turntable 130, multiple clamping mechanisms 200, and multiple detection baffles 120.

[0069] A standard ruler 110 is mounted on the mounting bracket 100, extending in the front-to-back direction. A turntable 130 is rotatably mounted on the mounting bracket 100 and located in front of the standard ruler 110. A clamping mechanism 200 is mounted on the turntable 130 and rotates under the drive of the turntable 130. Multiple clamping mechanisms 200 are evenly distributed circumferentially along the axis of the turntable 130, and each clamping mechanism 200 is connected to a horizontal adjustment component 300. The horizontal adjustment component 300 is used to adjust the rangefinder to a horizontal state when it is mounted on the clamping mechanism 200. Multiple detection baffles 120 are spaced apart along the standard ruler 110. The detection baffles 120 are rotatably mounted so that they have an unfolded state and a retracted state.

[0070] During operation, multiple rangefinders of different or the same model are first mounted on the clamping mechanism 200, with multiple detection baffles 120 in the unfolded state. The drive turntable 130 rotates, and as it rotates in increments, each clamping mechanism 200 reaches a preset position and pauses for a preset time. During each preset pause, the rangefinder measures and records the distance between the detection baffles 120. With each rotation of the turntable 130, the multiple detection baffles 120 retract sequentially from front to back, allowing the rangefinder to continuously measure the distance to the next detection baffle 120 and enabling each rangefinder to acquire multiple detection distances for calibration.

[0071] In this embodiment, the turntable 130 is connected to a motor, which drives the turntable 130 to rotate.

[0072] In some embodiments of the present invention, such as Figure 2 and Figure 5 As shown, the leveling assembly 300 includes an adjustment plate 310, a first adjustment part 320, a second adjustment part 330, a level sensor 340, and a mounting box 350. The mounting box 350 is mounted on the turntable 130, and the adjustment plate 310 is mounted on the mounting box 350. A clamping mechanism 200 is mounted on the adjustment plate 310, and the first adjustment part 320 and the second adjustment part 330 are mounted on the mounting box 350 and connected to each other at both ends of the adjustment plate 310. The first adjustment part 320 and the second adjustment part 330 are used to adjust the height of both ends of the adjustment plate 310, respectively. The level sensor 340 is connected to the first adjustment part 320 and the second adjustment part 330 and is used to detect the horizontal state of the rangefinder on the clamping mechanism 200 so that the first adjustment part 320 and the second adjustment part 330 can make corresponding adjustments to the adjustment plate 310.

[0073] Specifically, when the clamping mechanism 200 is in the clamping state, the rangefinder is in a fixed state. The clamping mechanism 200 is fixedly mounted on the adjustment plate 310 so that the rangefinder changes accordingly with the adjustment plate 310. Therefore, when the adjustment plate 310 is adjusted in the front-to-back direction, the height of the front and rear ends of the rangefinder changes accordingly, thereby adjusting the level of the rangefinder.

[0074] Furthermore, the first adjustment unit 320 and the second adjustment unit 330 respectively drive the height changes of the front and rear ends of the adjustment plate 310, thereby achieving the effect of adjusting the level of the adjustment plate 310. The level sensor 340 is used to measure the horizontal state of the rangefinder. The level sensor 340 can control the amount of height adjustment of the adjustment plate 310 by the first adjustment unit 320 and the second adjustment unit 330 according to the horizontal state. During operation, when the level sensor 340 measures that the front end of the rangefinder is higher than the rear end, the level sensor 340 controls the first adjustment unit 320 and the second adjustment unit 330 to raise the front end or lower the rear end of the adjustment plate 310 until the level sensor 340 measures that the front and rear ends of the rangefinder are at the same height, thus completing the adjustment of the rangefinder's level.

[0075] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the clamping mechanism 200 includes two clamping assemblies. The two clamping assemblies are symmetrically arranged about the centerline extending forward and backward from the adjusting plate 310. Each clamping assembly includes a clamping plate 210, a fixing plate 220, and multiple elastic elements 230. The fixing plate 220 is fixedly mounted on the adjusting plate 310. The elastic elements 230 are mounted on the fixing plate 220, and the clamping plate 210 is connected to the fixing plate 220 via the elastic elements 230. The two clamping plates 210 are parallel to each other, and when the turntable 130 rotates to a preset position, the clamping plate 210 is parallel to the standard ruler 110.

[0076] Specifically, the two clamping plates 210 are symmetrically arranged about the diameter of the turntable 130, and their parallel arrangement ensures that the rangefinder remains vertical in the front-to-back direction when held. When the turntable 130 rotates to a preset position, the clamping plates 210 are parallel to the standard ruler 110, ensuring that the laser emitted by the rangefinder does not deviate in the left-to-right direction; therefore, only the horizontal alignment of the rangefinder needs to be adjusted. Furthermore, the inner surface of the clamping plates 210 is roughened.

[0077] In some embodiments of the present invention, such as Figure 5 As shown, the first adjustment part 320 includes two adjustment screws 321, two adjustment gears 322, and a drive part. The adjustment screws 321 are slidably inserted into the mounting box 350, and their upper ends are hinged to the shaft of the adjustment plate 310. The adjustment gears 322 are rotatably mounted on the mounting box 350 and sleeved on the adjustment screws 321, threadedly connected to them, so that when the adjustment gears 322 rotate, they drive the adjustment screws 321 to move up and down. The drive part is located inside the mounting box 350 and connected to the adjustment gears 322, used to drive the adjustment gears 322 to rotate. The drive part is connected to the inductive level 340. The first adjustment part 320 and the second adjustment part 330 have the same structure.

[0078] Specifically, the two adjusting screws 321 are symmetrical about the diameter of the turntable 130. The adjusting gear 322 and the adjusting screws 321 form a screw-nut mechanism, which drives the adjusting screws 321 to move up and down when the adjusting gear 322 rotates. The drive unit controls the lifting height of the adjusting screws 321 by adjusting the rotation angle of the adjusting gear 322 through industrial control.

[0079] In some embodiments of the present invention, such as Figure 4 As shown, the sensing level 340 includes a connecting frame 341, a sensing tube 342, and a steel ball 343. The connecting frame 341 is fixedly mounted on the clamping mechanism 200. The sensing tube 342 has a hollow internal structure, is hinged to the connecting frame 341, and is located above the rangefinder. The axis of the sensing tube 342 is parallel to the clamping plate 210. A first sensing plate 344 and a second sensing plate 345 are respectively provided at both ends of the sensing tube 342. The first sensing plate 344 is connected to the first sensing unit so that the first sensing unit is activated when the first sensing plate 344 is triggered. The second sensing plate 345 is connected to the second sensing unit so that the second sensing unit is activated when the second sensing plate 345 is triggered. The steel ball 343 is placed inside the sensing tube 342 so that the steel ball 343 rolls inside the sensing tube 342 when the sensing tube 342 is tilted.

[0080] Specifically, the sensing tube 342 reflects the horizontal state of the rangefinder. When one end of the sensing tube 342 is low, the steel ball 343 rolls down the pipe until it contacts the first sensing plate 344 or the second sensing plate 345. Further, both the first sensing plate 344 and the second sensing plate 345 are two motor plates. When the steel ball 343 contacts both electrodes of the first sensing plate 344 or the second sensing plate 345 simultaneously, a passage is formed. When the steel ball 343 contacts the two electrodes of the first sensing plate 344, the drive unit of the first adjustment unit 320 is activated; when the steel ball 343 contacts the two electrodes of the second sensing plate 345, the drive unit of the second adjustment unit 330 is activated. In this embodiment, the sensing tube 342 is a glass tube. The glass tube is hinged to the connecting frame 341, and the hinge shaft extends in the left-right direction, allowing the sensing tube to be tilted and adjusted in the front-back direction.

[0081] In other embodiments of the invention, the connecting frame 341 is telescopic, thereby allowing adjustment of the height of the sensing tube 342.

[0082] In some embodiments of the present invention, such as Figure 4 and Figure 6 As shown, the inductive level 340 also includes a leveling plate 346. The leveling plate 346 is fixedly connected to the sensing tube 342 and is located below the sensing tube 342. The lower surface of the leveling plate 346 has a horizontal surface that is perpendicular to the sensing tube 342.

[0083] Specifically, the horizontal pad 346 allows the sensor tube 342 to be aligned with the horizontal surface of the rangefinder, thereby improving measurement accuracy.

[0084] In some embodiments of the present invention, such as Figure 5 As shown, the drive unit includes a drive motor 323 and an adjusting rack 324. The adjusting rack 324 is slidably mounted in the mounting box 350 in the left-right direction. The adjusting rack 324 has a double-sided rack structure, with one side of the rack meshing with two adjusting gears 322. The drive motor 323 is fixedly mounted on the mounting box 350, and a drive gear is fixed on the output shaft of the drive motor 323, which meshes with the other side of the rack 324.

[0085] Specifically, the adjustment rack 324 is configured to drive the two adjustment gears 322 to rotate synchronously in the same direction when the adjustment rack 324 slides left and right.

[0086] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A method for calibrating a handheld laser rangefinder, characterized in that, include: Various laser rangefinders of different models to be tested are mounted on clamping mechanisms evenly distributed around the circumference of the turntable; Multiple testing points were set along the standard ruler; The rangefinder is adjusted to a horizontal position by adjusting the multi-degree-of-freedom clamping mechanism; When all the detectors are adjusted to a horizontal position, the turntable rotates in increments to move the rangefinder to a preset inspection position, so that the rangefinder can obtain the distance to the inspection point. The turntable is then rotated multiple times to drive each rangefinder to pass through the detection position multiple times, thereby obtaining the distance of each rangefinder to each detection point. Obtain the error value of the standard distance corresponding to each of the rangefinders and the plurality of detection points; A calibration report is generated based on multiple error values ​​for each of the rangefinders.

2. The handheld laser rangefinder calibration method according to claim 1, characterized in that, Each detection point is provided with a detection baffle that can be retracted and extended; the plurality of detection baffles and the clamping mechanism are, from near to far, the first baffle, the second baffle, the third baffle, ... the nth baffle; The step of rotating the turntable multiple times to drive each rangefinder to pass through the detection position multiple times, thereby obtaining the distance of the rangefinder to each detection point, includes: During the first rotation of the turntable, all the rangefinders acquire the distance to the first baffle, which is recorded as the first detection distance; After the turntable rotates one revolution, the first baffle retracts and the second baffle unfolds. The turntable rotates again, and all the rangefinders acquire the distance to the second baffle, which is recorded as the second detection distance; Repeat the above steps to obtain the third detection distance...the nth detection distance.

3. A handheld laser rangefinder calibration device, used in the handheld laser rangefinder calibration method according to any one of claims 1 or 2, characterized in that, include: Mounting frame, wherein a standard ruler is provided on the mounting frame and the standard ruler extends in the front-to-back direction; A turntable, which is rotatably mounted on the mounting bracket and located in front of the standard ruler; Multiple clamping mechanisms are disposed on the turntable and rotate under the drive of the turntable; the multiple clamping mechanisms are evenly distributed circumferentially along the axis of the turntable; each clamping mechanism is connected to a horizontal adjustment component, which is used to adjust the rangefinder to a horizontal state when the rangefinder is installed on the clamping mechanism; Multiple detection baffles are arranged at intervals along the standard ruler; the detection baffles are rotatably arranged so that they have an unfolded state and a retracted state.

4. The handheld laser rangefinder calibration device according to claim 3, characterized in that, The leveling assembly includes an adjustment plate, a first adjustment section, a second adjustment section, a level sensor, and a mounting box; The mounting box is disposed on the turntable; the adjusting plate is disposed on the mounting box; the clamping mechanism is mounted on the adjusting plate; the first adjusting part and the second adjusting part are mounted on the mounting box and are respectively located at both ends of the adjusting plate; the first adjusting part and the second adjusting part are used to adjust the height of both ends of the adjusting plate respectively; the sensing level is connected to the first adjusting part and the second adjusting part and is used to detect the horizontal state of the rangefinder on the clamping mechanism so that the first adjusting part and the second adjusting part can make corresponding adjustments to the adjusting plate.

5. The handheld laser rangefinder calibration device according to claim 4, characterized in that, The clamping mechanism includes two clamping components; the two clamping components are symmetrically arranged about the center line of the front and rear extension of the adjustment plate. The clamping assembly includes a clamping plate, a fixing plate, and multiple elastic elements; the fixing plate is fixedly mounted on the adjusting plate; the elastic elements are mounted on the fixing plate; the clamping plate is connected to the fixing plate via the elastic elements. The two clamping plates are parallel to each other, and when the turntable rotates to a preset position, the clamping plates are parallel to the standard ruler.

6. The handheld laser rangefinder calibration device according to claim 4, characterized in that, The first adjustment part includes two adjustment screws, two adjustment gears, and a drive part; The adjusting screw is slidably inserted into the mounting box, and its upper end is hinged to the adjusting plate shaft. The adjusting gear is rotatably mounted on the mounting box and sleeved on the adjusting screw, and threadedly connected to the adjusting screw, so as to drive the adjusting screw to move up and down when the adjusting gear rotates. The driving unit is located inside the mounting box and connected to the adjusting gear, for driving the adjusting gear to rotate. The driving unit is connected to the sensing level. The first adjustment part and the second adjustment part have the same structure.

7. The handheld laser rangefinder calibration device according to claim 5, characterized in that, The inductive level includes a connecting frame, an inductive tube, and a steel ball; The connecting frame is fixedly mounted on the clamping mechanism; the sensing tube has a hollow internal structure, is hinged to the connecting frame, and is located above the rangefinder; the axis of the sensing tube is parallel to the clamping plate; a first sensing plate and a second sensing plate are respectively provided at both ends of the sensing tube; the first sensing plate is connected to the first sensing part so that the first sensing part is activated when the first sensing plate is triggered; the second sensing plate is connected to the second sensing part so that the second sensing part is activated when the second sensing plate is triggered; the steel ball is placed inside the sensing tube so that the steel ball rolls inside the sensing tube when the sensing tube is tilted.

8. The handheld laser rangefinder calibration device according to claim 7, characterized in that, The first and second sensing plates are both two motor plates; when the steel ball comes into contact with the two electrode plates of the first or second sensing plate simultaneously, a circuit is formed.

9. The handheld laser rangefinder calibration device according to claim 7, characterized in that, The inductive level also includes a leveling pad; The horizontal pad is fixed to the sensing tube and is located below the sensing tube; the lower surface of the horizontal pad has a horizontal surface perpendicular to the sensing tube.

10. The handheld laser rangefinder calibration device according to claim 6, characterized in that, The drive unit includes a drive motor and an adjusting rack; The adjusting rack is slidably disposed in the mounting box in the left-right direction; the adjusting rack is a double-sided rack structure, one side of the adjusting rack meshes with two adjusting gears; the drive motor is fixedly disposed on the mounting box, and a drive gear is fixed on the output shaft of the drive motor; the drive gear meshes with the other side of the adjusting rack.

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