Calibrating device of magnetic compass

Abstract

The utility model belongs to the technical field of calibration, and discloses a calibration device for a magnetic compass, which comprises a calibration mechanism comprising a rotating platform for driving the magnetic compass to rotate horizontally, a magnet assembly, and four groups of upright guide rails which are respectively positioned on the periphery of the rotating platform, a magnet block capable of sliding along the vertical direction of the vertical guide rail is arranged on the vertical guide rail; compared with the prior art, the magnetic compass has the following beneficial effects that through the design of the magnet assembly, when the magnetic compass rotates on the rotating platform, the height is adjusted by enabling the peripheral magnet blocks to slide up and down along the vertical guide rail, so that the height of the magnetic compass can be adjusted according to the autodyne condition when the magnetic compass rotates to different directions on the rotating platform; and the magnetic field action intensity between the magnet block and the magnetic compass is adjusted. Therefore, the autodyne of the magnetic compass can be corrected in a targeted manner, the calibration precision is improved, the operation of the sliding adjustment mode is more convenient, the time and labor cost required by calibration are reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of calibration technology, and specifically relates to a calibration device for a magnetic compass. Background Technology

[0002] In the field of navigation, the magnetic compass, as a basic navigation instrument, plays a crucial role in the safe navigation of ships. The Earth itself is a large magnet, and ships contain various magnetic materials, which can cause the magnetic compass to exhibit deviations. Therefore, calibrating the magnetic compass is essential to eliminate or reduce these deviations, ensuring that the magnetic compass accurately indicates direction and guides the ship to the correct course.

[0003] However, current magnetic compass calibration methods cannot flexibly adjust the magnetic field strength based on the compass's deviation when rotating in different directions. In actual calibration, facing the complex deviations generated by the magnetic compass at different angles, only relatively fixed calibration methods can be used, making it difficult to accurately match the deviation correction requirements at each angle. This results in low calibration accuracy and a significant reduction in the accuracy of the magnetic compass's direction indication. In scenarios such as navigation where high directional accuracy is required, this can easily lead to navigational deviations and pose safety hazards.

[0004] In view of this, this application proposes a magnetic compass calibration device to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a magnetic compass calibration device. By designing a magnet assembly, when the magnetic compass rotates on a rotating platform, the height of the surrounding magnet blocks can be adjusted by sliding them up and down along a vertical guide rail. This allows for adjustment of the magnetic field strength between the magnet blocks and the magnetic compass based on the compass's deviation when rotating in different directions on the platform. This enables targeted correction of the magnetic compass's deviation, improving calibration accuracy. Furthermore, the sliding adjustment method is more convenient, reducing calibration time and labor costs, and improving work efficiency. This solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A magnetic compass calibration device includes: a calibration mechanism, comprising a rotating platform for driving the magnetic compass to rotate horizontally, wherein an angle ring indicating the angle is provided on the outer side of the rotating platform; a magnet assembly, comprising a vertical guide rail, wherein four sets of vertical guide rails are respectively located around the rotating platform, and a magnet block that can slide along the vertical direction of the vertical guide rail is provided on the vertical guide rail; and an iron ball assembly, comprising an annular guide rail and four sets of adjusting rods that can slide along the path of the annular guide rail, wherein a soft iron ball that can slide along the adjusting rod is provided on each set of adjusting rods.

[0008] In a preferred embodiment, a support ring is provided below the rotating platform, and an annular groove is formed on the upper surface of the support ring. Multiple sets of universal balls are provided in the annular groove. One end of each universal ball is fixedly connected to the rotating platform, and the spherical part of the universal ball contacts the bottom of the annular groove.

[0009] In a preferred embodiment, a base plate is provided below the rotating platform, and a stepper motor is installed in the middle of the upper surface of the base plate. The output shaft of the stepper motor is connected to a transmission rod, and the upper end of the transmission rod is fixedly connected to the rotating platform. A set of inner support rods are fixedly connected to the four sides below the support ring, and the lower end of the inner support rods is fixedly connected to the base plate.

[0010] In a preferred embodiment, a vertical slider is slidably mounted on the upright guide rail, and the magnet is fixed on the side of the vertical slider near the rotating platform. A positioning bolt is threadedly connected to the middle of the magnet, and the tail end of the positioning bolt passes through the vertical slider.

[0011] In a preferred embodiment, a dovetail groove is provided below the vertical guide rail, and a bottom guide strip is provided inside the dovetail groove. The bottom guide strip matches the shape of the dovetail groove and is fixedly connected to the base plate.

[0012] In a preferred embodiment, four sets of outer support rods are fixedly connected to the inner side of the annular guide rail, and the lower ends of the outer support rods are fixedly connected to the base plate.

[0013] In a preferred embodiment, four sets of guide rail sliders are slidably mounted on the annular guide rail, and the adjusting rod fixes the guide rail sliders away from the annular guide rail.

[0014] In a preferred embodiment, a transverse slider is slidably sleeved outside the adjusting rod, the soft iron ball is located above the transverse slider, and the soft iron ball is fixedly connected to the transverse slider through a connecting rod. A clearance opening is provided at the corresponding position of the vertical guide rail and the adjusting rod.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] 1. By designing a magnet assembly, the magnetic compass can be adjusted in height by sliding the surrounding magnets up and down along a vertical guide rail as it rotates on the rotating platform. This allows for flexible adjustment of the magnetic field strength between the magnets and the magnetic compass based on the compass's deviation when rotating in different directions. This enables targeted correction of the magnetic compass's deviation at different angles, improving calibration accuracy and ensuring more accurate directional indication. This guide rail-based sliding adjustment method is more convenient to operate, reduces calibration time and labor costs, and improves work efficiency.

[0017] 2. By designing an iron ball assembly, four sets of soft iron balls can rotate and adjust their positions along the annular guide rail. They can also slide along the adjusting rod axis to adjust the distance between the soft iron balls and the magnetic compass. Because soft iron balls at different directions and distances have different effects on the magnetic field of the magnetic compass, this adjustment can more comprehensively and accurately compensate for the quadrantal deviations of the magnetic compass in various directions, making the magnetic compass pointing more precise. Compared to traditional fixed-position or inflexible adjustment calibration methods, this rotatable and sliding iron ball assembly design significantly shortens calibration time. Through simple rotation and sliding operations, suitable adjustment parameters can be quickly found, allowing the magnetic compass to be calibrated in a short time, improving the ship's sailing efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a magnetic compass calibration device according to the present invention.

[0020] Figure 2 This is a structural schematic diagram of a magnetic compass calibration device according to this utility model from another perspective.

[0021] Figure 3 This is a side view of the structure of a magnetic compass calibration device according to the present invention.

[0022] Figure 4 for Figure 2 A magnified structural diagram of part A.

[0023] Figure 5 for Figure 3 A magnified structural diagram of part B.

[0024] In the diagram, 1. Rotating platform; 11. Stepper motor; 12. Inner support rod; 13. Transmission rod; 14. Support ring; 15. Annular groove; 16. Universal ball; 2. Angle ring; 3. Iron ball assembly; 31. Soft iron ball; 32. Adjustment rod; 33. Lateral slider; 34. Circular guide rail; 35. Guide rail slider; 36. Outer support rod; 4. Magnet assembly; 41. Vertical guide rail; 42. Bottom guide bar; 43. Magnet block; 44. Vertical slider; 45. Positioning bolt; 46. Clearance opening; 5. Base plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1 to 5 A magnetic compass calibration device includes: a calibration mechanism, including a rotating platform 1 for driving the magnetic compass to rotate horizontally, with an angle ring 2 indicating the angle on the outer side of the rotating platform 1; a magnet assembly 4, including a vertical guide rail 41, with four sets of vertical guide rails 41 located around the rotating platform 1, and a magnet block 43 that can slide along the vertical direction of the vertical guide rail 41; and an iron ball assembly 3, including an annular guide rail 34 and four sets of adjusting rods 32 that can slide along the path of the annular guide rail 34, with a soft iron ball 31 that can slide along the adjusting rod 32 on each set of adjusting rods 32.

[0027] A support ring 14 is provided below the rotating platform 1, and an annular groove 15 is provided on the upper surface of the support ring 14. Multiple sets of universal balls 16 are provided in the annular groove 15. One end of the universal ball 16 is fixedly connected to the rotating platform 1, and the spherical part of the universal ball 16 contacts the bottom of the annular groove 15.

[0028] A base plate 5 is provided below the rotating platform 1. A stepper motor 11 is installed in the middle of the upper surface of the base plate 5. The output shaft of the stepper motor 11 is connected to a transmission rod 13. The upper end of the transmission rod 13 is fixedly connected to the rotating platform 1. A set of inner support rods 12 are fixedly connected to the four sides below the support ring 14, and the lower end of the inner support rods 12 is fixedly connected to the base plate 5.

[0029] A vertical slider 44 is slidably mounted on the vertical guide rail 41. A magnet block 43 is fixed on the side of the vertical slider 44 near the rotating platform 1, and a positioning bolt 45 is threadedly connected in the middle of the magnet block 43. The tail end of the positioning bolt 45 passes through the vertical slider 44.

[0030] A dovetail groove is provided below the vertical guide rail 41, and a bottom guide strip 42 is provided in the dovetail groove. The bottom guide strip 42 matches the shape of the dovetail groove and is fixedly connected to the base plate 5.

[0031] The vertical guide rail 41 can drive the dovetail groove to move axially along the path of the bottom guide bar 42, thereby facilitating the adjustment of the distance between the vertical guide rail 41 and the rotating platform 1.

[0032] Four sets of outer support rods 36 are fixedly connected to the inner side of the annular guide rail 34, and the lower end of the outer support rods 36 is fixedly connected to the base plate 5.

[0033] Four sets of guide rail sliders 35 are slidably mounted on the annular guide rail 34, and the adjusting rod 32 fixes the guide rail sliders 35 away from the annular guide rail 34.

[0034] A horizontal sliding block 33 is slidably sleeved on the outside of the adjusting rod 32. The soft iron ball 31 is located above the horizontal sliding block 33 and is fixedly connected to the horizontal sliding block 33 through a connecting rod. A clearance opening 46 is opened on the vertical guide rail 41 at the corresponding position of the adjusting rod 32.

[0035] The design of the clearance opening 46 allows the adjusting rod 32 to pass through the clearance opening 46 when the position of the vertical guide rail 41 is being adjusted, thus avoiding obstruction to the adjustment of the vertical guide rail 41.

[0036] In practical use, the working principle of this utility model is as follows:

[0037] In practical use, the magnetic compass is fixed to the rotating platform 1 with screws. The rotation of the rotating platform 1 is driven by a stepper motor 11, which is closely connected to the transmission rod 13. When the stepper motor 11 starts running, the rotational power it generates is transmitted to the transmission rod 13, thereby driving the rotating platform 1 to rotate. During the rotation of the rotating platform 1, the universal ball 16 and the annular groove 15 cooperate with each other, and the universal ball 16 can slide smoothly along the annular groove 15. This design reduces the friction when the rotating platform 1 rotates, ensuring that the rotating platform 1 can rotate smoothly. To facilitate the control of the rotation angle of the magnetic compass, an angle ring 2 is provided. During the rotation of the magnetic compass, the rotation angle can be visually observed through the angle ring 2, so that the magnetic compass can be rotated to a specific angle according to the calibration requirements, providing an accurate angle basis for subsequent calibration operations. When the magnetic compass is rotated to different directions, in order to achieve accurate correction of the self-error, it is necessary to flexibly adjust the magnetic field strength between the magnet block 43 and the magnetic compass. The height of the magnet 43 is adjusted by causing the vertical slider 44 to slide up and down along the vertical guide rail 41. After the height adjustment is complete, simply rotate the positioning bolt 45 to make it press firmly against the vertical guide rail 41, thus fixing the vertical slider 44 and keeping the magnet 43 at the desired height. During the calibration of the magnetic compass, the adjustment of the magnetic field strength is related to the height of the magnet 43. According to the basic principle of magnetic fields, the magnetic field strength is inversely proportional to the square of the distance. Changes in the height of the magnet 43 will change the distance between it and the magnetic compass. When the magnet 43 slides upward along the vertical guide rail 41, the height increases, the distance between it and the magnetic compass increases, and the magnetic field strength weakens accordingly; conversely, sliding downward reduces the height, the distance between them decreases, and the magnetic field strength increases. Moreover, changes in height will also change the direction in which the magnetic field acts on the magnetic compass. At different heights, the magnetic field of the magnet 43 is applied to the magnetic compass at different angles and in different ways. Given that magnetic compasses exhibit varying degrees of deviation in different directions, operators can precisely enhance or weaken the magnetic field strength by adjusting the height of magnet block 43 to address specific deviations. (For example, when a magnetic compass shows a fixed deviation in a certain direction (such as true north), the height of magnet block 43 needs to be adjusted to alter the superposition effect of its magnetic field on the magnetic compass. Alternatively, if the magnetic compass reading in the north direction is biased eastward due to interference from the ship's rigid iron hull material, the height of magnet block 43 needs to be lowered (to enhance the magnetic field), using a reverse magnetic field to counteract the interference.) This effectively improves the calibration accuracy of the magnetic compass and helps it accurately indicate direction.

[0038] During quadrant error correction, the adjusting rod 32 is rotated, causing the guide rail slider 35 to slide along the path of the annular guide rail 34, thereby adjusting the positions of the four sets of soft iron balls 31. After the positions of the soft iron balls 31 are adjusted, the connecting rod is further pushed by the soft iron balls 31. The connecting rod is connected to the transverse slider 33, which in turn causes the transverse slider 33 to slide along the outside of the adjusting rod 32, thereby adjusting the distance between the soft iron balls 31 and the magnetic compass. Since the magnetic field of the soft iron balls 31 at different directions and distances has different effects on the magnetic field of the magnetic compass, the quadrant compensation effect of the soft iron magnetic field is used to offset the directional error. Through the above multi-dimensional coordinated adjustment, the magnetic compass error is reduced to less than 0.2° within a 360° range, achieving high-precision pointing calibration. This adjustment method can more comprehensively and accurately compensate for the quadrant error of the magnetic compass in all directions, making the magnetic compass pointing more accurate.

[0039] In summary, during each adjustment of the magnetic field environment, the magnetic compass is slowly rotated one full circle, and its indication within a 360° range is carefully observed to confirm whether the self-error has stabilized within a range of less than 0.2°. This confirms whether the calibration has met the standards. By observing the magnetic compass's full rotation, any uncompensated self-error issues in specific directions can be identified. For example, in certain quadrants or specific angular regions, the magnetic compass indication may still have a large deviation, indicating that the adjustment of the magnetic field environment in these directions is not accurate or sufficient. If a large difference in the self-error range is observed, i.e., it is not stable within the range of less than 0.2°, the magnetic field environment needs further adjustment. Based on the specific self-error of the magnetic compass in different directions, the height of the magnet block 43 or the distance of the soft iron ball 31 can be adjusted again to further optimize the magnetic field environment, ensuring that the self-error of the magnetic compass in all directions meets the accuracy requirements. If the self-error of the magnetic compass in all directions meets the calibration requirements, the calibration work is complete. At this point, the magnetic compass can accurately indicate direction in the changed magnetic field environment.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic compass calibration device, characterized in that, include: The calibration mechanism includes a rotating platform (1) for driving the magnetic compass to rotate horizontally, and an angle ring (2) indicating the angle is provided on the outside of the rotating platform (1); The magnet assembly (4) includes a vertical guide rail (41), which has four sets located around the rotating platform (1). The vertical guide rail (41) is provided with a magnet block (43) that can slide along the vertical direction of the vertical guide rail (41). The iron ball assembly (3) includes an annular guide rail (34) and four sets of adjustable rods (32) that can slide along the path of the annular guide rail (34). Each set of adjustable rods (32) is provided with a soft iron ball (31) that can slide along the adjustable rod (32).

2. The magnetic compass calibration device as described in claim 1, characterized in that: The rotating platform (1) is provided with a support ring (14) below it, and an annular groove (15) is provided on the upper surface of the support ring (14). Multiple sets of universal balls (16) are provided in the annular groove (15). One end of the universal ball (16) is fixedly connected to the rotating platform (1), and the spherical part of the universal ball (16) contacts the bottom of the annular groove (15).

3. The magnetic compass calibration device as described in claim 2, characterized in that: The rotating platform (1) is provided with a base plate (5) below it. A stepper motor (11) is installed in the middle of the upper surface of the base plate (5). The output shaft of the stepper motor (11) is connected to a transmission rod (13). The upper end of the transmission rod (13) is fixedly connected to the rotating platform (1). A set of inner support rods (12) are fixedly connected to the four sides below the support ring (14), and the lower end of the inner support rods (12) is fixedly connected to the base plate (5).

4. The magnetic compass calibration device as described in claim 3, characterized in that: A vertical slider (44) is slidably mounted on the vertical guide rail (41). The magnet block (43) is fixed on the side of the vertical slider (44) near the rotating platform (1), and a positioning bolt (45) is threaded in the middle of the magnet block (43). The tail end of the positioning bolt (45) passes through the vertical slider (44).

5. The magnetic compass calibration device as described in claim 4, characterized in that: The vertical guide rail (41) has a dovetail groove below it, and a bottom guide strip (42) is provided in the dovetail groove. The bottom guide strip (42) matches the shape of the dovetail groove, and the bottom guide strip (42) is fixedly connected to the base plate (5).

6. The magnetic compass calibration device as described in claim 3, characterized in that: Four sets of outer support rods (36) are fixedly connected to the inner side of the annular guide rail (34), and the lower end of the outer support rods (36) is fixedly connected to the base plate (5).

7. The magnetic compass calibration device as described in claim 6, characterized in that: Four sets of guide rail sliders (35) are slidably installed on the annular guide rail (34), and the adjusting rod (32) fixes the guide rail sliders (35) away from the annular guide rail (34).

8. The magnetic compass calibration device as described in claim 6, characterized in that: The adjusting rod (32) is slidably fitted with a transverse sliding block (33), the soft iron ball (31) is located above the transverse sliding block (33), and the soft iron ball (31) is fixedly connected to the transverse sliding block (33) through a connecting rod. The vertical guide rail (41) is provided with a clearance opening (46) at the corresponding position of the adjusting rod (32).

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