Magnetic compass precision calibration device

Abstract

The utility model relates to a calibration device, in particular to a magnetic compass precision calibration device. A magnetic compass precision calibration device comprises a support, an upper base body, a lower base body and a base, the support is fixedly connected to the upper base body, the upper base body is connected with the lower base body, and the base is connected to the lower base body; a rail set is arranged between the upper base body and the lower base body and enables the upper base body to rotate relative to the lower base body. A plurality of first connecting through holes are formed in the support, a plurality of first fixing through holes are formed in the upper base body, and the first connecting through holes and the first fixing through holes are in one-to-one correspondence and are connected through mortise and tenon bolts. A plurality of second connecting through holes are formed in the base, a plurality of second fixing through holes are formed in the lower base body, and the second connecting through holes and the second fixing through holes are in one-to-one correspondence and are connected through mortise and tenon bolts. According to the utility model, the calibration time of the magnetic compass can be reduced, the calibration error is reduced, and the calibration efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a calibration device, in particular to a magnetic compass accuracy calibration device. Background Art

[0002] As an important navigation device for ships, the magnetic compass is a basic navigation method and is installed on every ship in huge quantities. The magnetic compass is affected by various external interference sources. After a period of time, a large error will occur and the navigation accuracy will decrease. It is necessary to perform precision calibration regularly to maintain a high precision index. The precision calibration process requires a rotation every 10 degrees to complete a 360-degree precision calibration, with a total of 36 rotation positions.

[0003] As one of the marine navigation equipment, the magnetic compass is a backup device. Due to its low price, manufacturers are unwilling to invest a lot of resources and energy in the research of precision calibration and convenience. Maintenance and support units can only use the manual contact rotation method. There is no better and more convenient method. At present, in practical work, crew members or maintenance technicians use the manual contact rotation method to directly rotate the main compass bowl through manual operation. Each position must be rotated multiple times to collect and record data. A total of several positions need to be recorded, and the calibration process is time-consuming.

[0004] The manual contact rotation method has the following three disadvantages: First, the main compass basin is in full contact with the base on the hull, resulting in great friction during rotation, and the rotation to each fixed position is not accurate enough, requiring repeated rotation back and forth. Second, manual rotation of the main compass basin will introduce human errors, causing the main compass basin to shake back and forth in the horizontal plane, which in turn causes visual reading errors and affects precision calibration. Third, during the manual rotation of the main compass basin, the force cannot be precisely controlled, resulting in the communication cable between the main compass basin and the base on the hull being easily pinched or stuck during rotation. Utility Model Content

[0005] The utility model aims to provide a magnetic compass precision calibration device to solve the problem of long magnetic compass calibration time and large error.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A magnetic compass precision calibration device comprises a bracket, an upper base, a lower base and a base, wherein the bracket is fixedly connected to the upper base, the upper base is connected to the lower base, and the base is connected to the lower base; a track group is arranged between the upper base and the lower base, and the track group can make the upper base rotate relative to the lower base.

[0008] Furthermore, the bracket is provided with a plurality of first connecting through holes, and the upper base is provided with a plurality of first fixing through holes, and the first connecting through holes correspond to the first fixing through holes one by one and are connected by mortise and tenon pins.

[0009] Furthermore, the base is provided with a plurality of second connecting through holes, and the lower base is provided with a plurality of second fixing through holes, and the second connecting through holes correspond one-to-one with the second fixing through holes and are connected by mortise and tenon pins.

[0010] Furthermore, the track group includes a first track and a second track, the first track is located on the inner side of the second track; the first track and the second track respectively include an upper track and a lower track, the upper track is located at the bottom of the upper base, and the lower track is located at the top of the lower base, the upper track is adapted to the lower track, and a ball bearing is provided between the upper track and the lower track.

[0011] Furthermore, the upper base is provided with a first fixing groove, and the bracket is inserted into the first fixing groove.

[0012] Furthermore, a second fixing groove is provided on the lower base, and the base is inserted into the second fixing groove.

[0013] Furthermore, a slide rail is provided on the lower base, and the slide rail facilitates the passage of the mortise and tenon pins.

[0014] Furthermore, the base is a hollow structure to facilitate placement of communication cables.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] The utility model adds an upper base and a lower base under the magnetic compass, and fixes them on the hull through a base, thus avoiding direct contact between the magnetic compass and the hull. Adding a track group between the upper base and the lower base can reduce the friction of the magnetic compass during rotation. The magnetic compass is fixedly connected to the upper base through a bracket, and the lower base is connected to the hull through the base. The magnetic compass is calibrated and rotated through the upper base to avoid shaking back and forth and reduce errors. The communication cable connected to the magnetic compass is placed in the hollow structure of the base to avoid the cable being stuck or clamped off during rotation calibration, thereby increasing the workload. The utility model can reduce calibration time, reduce calibration errors, and improve calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of a magnetic compass accuracy calibration device.

[0018] Figure 2 The figure is a cross-sectional view of a magnetic compass accuracy calibration device.

[0019] Figure 3 Schematic diagram of the connection between the bracket and the upper base.

[0020] Figure 4 Schematic diagram of the connection between the lower base and the base.

[0021] Figure 5 Schematic diagram of the upper substrate.

[0022] Figure 6 Schematic diagram of the lower substrate. DETAILED DESCRIPTION

[0023] like Figures 1 to 6 As shown, a magnetic compass precision calibration device includes a bracket 1, an upper base 2, a lower base 3 and a base 4, wherein the bracket 1 is fixedly connected to the upper base 2, the upper base 2 is connected to the lower base 3, and the base 4 is connected to the lower base 3; a track group is arranged between the upper base 2 and the lower base 3, and the track group can make the upper base 2 rotate relative to the lower base 3. The track group includes a first track 5 and a second track 6, and the first track 5 is located inside the second track 6; the first track 5 and the second track 6 respectively include an upper track 7 and a lower track 8, the upper track 7 is located at the bottom of the upper base 2, and the lower track 8 is located at the top of the lower base 3, the upper track 7 is adapted to the lower track 8, and a plurality of balls are arranged between the upper track 7 and the lower track 8, the first track 5 and the second track 6 are concentric tracks, and the two tracks can better make the upper base 2 rotate on the lower base 3, and the fluency, stability and accuracy of the device are greatly improved. The magnetic compass is connected to the upper base 2 through the bracket 1. When the magnetic compass needs to be calibrated, the magnetic compass is controlled to rotate on the lower base 3 through the upper base 2, and the direct contact between the magnetic compass and the hull is avoided, thereby reducing the friction between the magnetic compass and the hull. The friction between the upper base 2 and the lower base 3 is reduced by the track group provided with the ball bearings, and the problem of the magnetic compass shaking back and forth due to the manual rotation of the bracket 1 will not occur due to the existence of the ball bearings, thereby eliminating the error caused by the shaking back and forth of the magnetic compass. The bracket 1, the upper base 2, the lower base 3 and the base 4 are all circular and are arranged concentrically with each other, which also improves the accuracy of the device.

[0024] The bracket 1 is provided with a plurality of first connection through holes 11, and the upper base 2 is provided with a plurality of first fixing through holes 12, the first connection through holes 11 correspond to the first fixing through holes 12 one by one and are connected by mortise and tenon bolts. The base 4 is provided with a plurality of second connection through holes 13, and the lower base 3 is provided with a plurality of second fixing through holes 14, the second connection through holes 13 correspond to the second fixing through holes 14 one by one and are connected by mortise and tenon bolts. The mortise and tenon bolts connect the upper rail 7 and the lower rail 8 into a whole, which improves the universality of the device in different scenarios and facilitates the later maintenance and repair of the device by the staff.

[0025] The upper base 2 is provided with a first fixing groove, the bracket 1 is inserted into the first fixing groove, and the bracket 1 is fixedly connected to the upper base 2. The lower base 3 is provided with a second fixing groove, the base 4 is inserted into the second fixing groove, and the base 4 is fixedly connected to the lower base 3. A stopper 15 is provided on the outer side of the lower base 3, so that the upper base 2 is located inside the lower base 3, and the upper base 2 is concentrically connected to the lower base 3. The lower base 3 is provided with a slide rail 16, and the slide rail 16 facilitates the upper base 2 to drive the magnetic compass to rotate through the bracket 1, so that the mortise and tenon pin can pass smoothly through the slide rail 16. The base 4 is a hollow structure, which is convenient for placing communication cables, so as to avoid the communication cables being stuck or even pinched off during the rotation of the upper base 2.

[0026] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A magnetic compass accuracy calibration device, characterized in that: It includes a bracket, an upper base, a lower base and a base, the bracket is fixedly connected to the upper base, the upper base is connected to the lower base, and the base is connected to the lower base; a track group is arranged between the upper base and the lower base, and the track group can make the upper base rotate relative to the lower base.

2. A magnetic compass accuracy calibration device according to claim 1, characterized in that: The bracket is provided with a plurality of first connecting through holes, and the upper base is provided with a plurality of first fixing through holes, wherein the first connecting through holes correspond to the first fixing through holes one by one and are connected by mortise and tenon pins.

3. The magnetic compass accuracy calibration device according to claim 1, characterized in that: The base is provided with a plurality of second connecting through holes, and the lower base is provided with a plurality of second fixing through holes, wherein the second connecting through holes correspond to the second fixing through holes one by one and are connected by mortise and tenon pins.

4. The magnetic compass accuracy calibration device according to claim 1, characterized in that: The track group includes a first track and a second track, the first track is located on the inner side of the second track; the first track and the second track respectively include an upper track and a lower track, the upper track is located at the bottom of the upper base, and the lower track is located at the top of the lower base, the upper track is adapted to the lower track, and a ball bearing is provided between the upper track and the lower track.

5. The magnetic compass accuracy calibration device according to claim 1, characterized in that: The upper base is provided with a first fixing groove, and the bracket is inserted into the first fixing groove.

6. The magnetic compass accuracy calibration device according to claim 1, characterized in that: The lower base is provided with a second fixing groove, and the base is inserted into the second fixing groove.

7. The magnetic compass accuracy calibration device according to claim 1, characterized in that: The lower base is provided with a slide rail, which facilitates the passage of the mortise and tenon pins.

8. The magnetic compass accuracy calibration device according to claim 1, characterized in that: The base is a hollow structure which is convenient for placing communication cables.

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