Measuring device and measuring method for measuring true north azimuth angle based on theodolite

Abstract

The invention discloses a measuring device and a measuring method for measuring true north azimuth angle based on a theodolite, the measuring device comprises a fixing frame, one side of the top of the fixing frame is fixedly connected with a fixing block, the fixing block is internally provided with a driving assembly, the top end of the driving assembly is fixedly connected with a placing table, the top of the placing table is clamped with a theodolite device, and the theodolite device is fixedly connected with the fixing block. A fixed bevel protractor is arranged at the bottom of the placing table, a movable bevel protractor is arranged at the top of the fixing block, and a balance rod is fixedly connected to the other side of the top of the fixing frame. By arranging the adjusting assembly and the limiting piece, before the equipment is used, the true north direction can be marked through a rented gyro theodolite, the vertical edge of the vertical line of the fixed bevel protractor is connected with the arc-shaped rod through the extension plate by utilizing the limiting piece, an absolute point O is marked, and then the position of the fixed bevel protractor is adjusted through the adjusting assembly; therefore, the fixed bevel protractor is fixed in the true north direction.

Description

TECHNICAL FIELD

[0001] The present application relates to true north azimuth measuring device technical field, especially to a kind of based on theodolite measurement true north azimuth measuring device and measuring method. BACKGROUND

[0002] True north, through any point on the ground, the direction of the North Pole is called true north, its direction line is true north direction line or true meridian, the east-west inner map margin line on topographic map is true meridian, the horizontal angle of a straight line from true meridian north end clockwise direction is called true azimuth.

[0003] But the product that can measure true north azimuth on market existing has inertial navigation, gyro theodolite, three-axis turntable etc., but the above-mentioned product needs to be calibrated in advance when operating, calibration time is longer, so that operating personnel utilizes equipment to measure true north azimuth is more troublesome, increase the labor intensity of operating personnel, so that the practicability of equipment declines, and existing equipment is expensive, increases the use cost of equipment. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art and provide a measuring device and method for measuring true north azimuth based on a theodolite.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a measuring device for measuring true north azimuth based on a theodolite, comprising a fixed frame, a fixed block is fixedly connected to one side of the top of the fixed frame, a driving assembly is provided in the fixed block, a placing table is fixedly connected to the top end of the driving assembly, a theodolite device is clamped to the top of the placing table, a fixed angle ruler is provided at the bottom of the placing table, a movable angle ruler is provided at the top of the fixed block, a balance bar is fixedly connected to the other side of the top of the fixed frame, a fixed rod is fixedly connected to one side of the top of the fixed frame close to the balance bar, an adjusting assembly is provided in the fixed rod, a central hole is formed in the middle of the placing table, and a block is provided at one end of the top of the balance bar.

[0006] Further description of the above technical scheme:

[0007] The driving assembly comprises a cavity formed in the surface of the fixed block, a rotating shaft is rotatably connected to the top of the inner wall of the cavity, an arc-shaped rod is fixedly connected to the top of the rotating shaft, an extension plate is fixedly connected to one end of the arc-shaped rod close to the top of the fixed angle ruler, and a limiting piece is provided on the outer contour of the two arc-shaped rods close to the top and connected to the extension plate.

[0008] Further description of the above technical scheme:

[0009] The driving assembly further comprises a bevel gear I fixedly connected at the bottom of the rotating shaft, a rotating drum I arranged at the outer edge of the top of the bevel gear I and connected with the top of the inner wall of the cavity, a rotating rod rotatably connected at the side of the cavity, a bevel gear II fixedly connected at the other end of the rotating rod, a rotating drum II arranged at the side of the bevel gear II close to the rotating rod, a fixed cylinder rotatably connected at one side of the inner wall of the cavity and connected with the rotating drum II, a handle fixedly connected at one end of the rotating rod, and a clamping piece arranged on the outer contour of the rotating drum II.

[0010] As a further description of the above technical solution:

[0011] The limiting piece comprises an inner rotating bearing rotatably connected with the outer contour of the arc-shaped rod close to the top thereof, the outer contour of the inner rotating bearing is connected with the extension plate, a limiting ring is fixedly connected at the outer contour of the inner rotating bearing close to the bottom, and a limiting bolt is arranged at the bottom of the limiting ring.

[0012] As a further description of the above technical solution:

[0013] The adjusting assembly comprises a sliding groove arranged on the fixed rod, a sliding rod limitingly and slidably connected with the inner wall of the sliding groove, a sliding groove arranged at the top of the sliding rod, a sliding block slidably connected with the top inner wall of the sliding groove, and a connecting rod fixedly connected with the top of the sliding block.

[0014] As a further description of the above technical solution:

[0015] The fixed angle ruler is provided with an adjusting groove penetrating through the surface close to the connecting rod and used for clamping the connecting rod, an adjusting bolt is arranged at the inner wall of the adjusting groove, and the bottom of the adjusting bolt is threadedly connected with the connecting rod.

[0016] As a further description of the above technical solution:

[0017] The clamping piece comprises a reset spring arranged in the inner cavity of the fixed cylinder and sleeved with the rotating rod, a clamping block fixedly connected at the top of the outer contour of the rotating drum II, a moving groove arranged at the top of the outer contour of the fixed cylinder and used for slidably connecting the clamping block, a clamping groove arranged at one side of the inner wall of the moving groove, a groove arranged in the clamping groove away from the inner wall of the moving groove and used for clamping the clamping block, a positioning scale arranged at the top of the side wall of the fixed block close to the rotating rod and at the other end of the handle away from the bevel gear II, a blocking ring fixedly connected at one end of the rotating drum II close to the inner wall of the fixed cylinder and limitingly and slidably connected with the inner wall of the fixed cylinder.

[0018] As a further description of the above technical solution:

[0019] A blocking block is fixedly connected at the other end of the sliding rod away from the sliding block and limitingly and slidably connected at the inner wall of the sliding groove.

[0020] As a further description of the above technical solutions:

[0021] The bottom of the fixed block is fixedly connected with a horizontal sensor on one side, and the surface of the fixed frame is fixedly connected with a display control screen; the outer wall of the bottom of the support rod on the fixed frame is fixedly connected with an infrared height sensor; the bottom of the support rod on the fixed frame is provided with a mounting hole; the top of the inner wall of the mounting hole is fixedly connected with an electric push rod; the bottom of the electric push rod is fixedly connected with a supporting block; the top of the electric push rod is fixedly connected with a fixed bolt; and the top of the inner wall of the mounting hole is provided with a threaded groove for screwing the fixed bolt.

[0022] Referring to Figures 1-8 A use method of a measuring device and a measuring method for measuring a true north azimuth based on a theodolite, and the steps are as follows:

[0023] S1, place the rented gyro theodolite on the top of the placing table, remove the limiting bolt by using a wrench, and then measure the true north direction by the gyro theodolite; because the fixed angle ruler is connected with the arc-shaped rod through the extension plate and the longitudinal line vertical edge, it is convenient to mark the absolute O point; at this time, the operator rotates the extension plate around the arc-shaped rod, so as to mark the fixed angle ruler on the true north direction; after the marking is completed, the adjusting groove opened on the fixed angle ruler is aligned with the connecting rod, the fixed angle ruler and the connecting rod are fixed by using the adjusting bolt, and then the limiting bolt is installed on the extension plate; at this time, the marking of the true north direction is completed.

[0024] S2, install the theodolite device on the top of the placing table, and irradiate the center hole on the theodolite device with the laser, so that the O point is parallel to the longitudinal line surface of the block; adjust the lower base of the theodolite, so that the theodolite laser is perpendicular to the O point; at this time, rotate the rotating rod to drive the bevel gear I to rotate, and then drive the movable angle ruler on the arc-shaped rod and the placing table to rotate; and then observe the longitudinal line of the movable angle ruler by the theodolite device, so as to measure the true north azimuth.

[0025] S3, after the driving assembly is damaged, pull out the bevel gear II to drive the rotating drum II to move the fixed cylinder, so that the clamping block enters the moving groove; then rotate the rotating rod, so that the clamping block moves in the clamping groove; when the clamping block moves to the groove in the clamping groove, the clamping groove is clamped through the groove; at this time, manually rotate the movable angle ruler, and then adjust the lower base of the theodolite device to drive the theodolite device to rotate; by moving the cross wire on the theodolite device to the longitudinal line of the movable angle ruler, the true north azimuth is measured.

[0026] The present application has the following beneficial effects:

[0027] 1. Compared with existing technologies, this measuring device and method for measuring true north azimuth using a theodolite, through the setting of adjustment components and limiting components, allows the true north direction to be marked using a rented gyro theodolite before the equipment is used. The vertical edge of the fixed angle ruler is connected to the arc rod through the extension plate using the limiting components to mark the absolute O point. Then, the position of the fixed angle ruler is adjusted by the adjustment components, thereby fixing the fixed angle ruler in the true north direction. This avoids the problem that existing equipment cannot reuse the fixed angle ruler after it is fixed in the true north direction, which increases the cost of using the equipment.

[0028] 2. Compared with the existing technology, the measuring device and method for measuring true north azimuth based on theodolite can drive the arc rod to rotate through the set drive component. The rotating arc rod drives the movable angle ruler to move. Then, the longitudinal line of the movable angle ruler is observed through the theodolite to measure the true north azimuth, making the measurement of true north azimuth more convenient.

[0029] 3. Compared with existing technologies, this measuring device and method for measuring true north azimuth using a theodolite, through the setting of a snap-fit ​​component, can separate the meshing bevel gear one and bevel gear two when the drive component is damaged. Then, the operator can manually rotate the movable angle ruler and use the adjustment knob on the theodolite to move the crosshairs on the theodolite to the vertical line of the movable angle ruler to measure the true north azimuth. This allows the device to still manually measure the true north azimuth even after the drive component is damaged, further increasing the practicality of the device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall main structure of the measuring device and method for measuring true north azimuth based on a theodolite proposed in this invention.

[0031] Figure 2 This is a cross-sectional view of the cavity and placement platform of the measuring device and method for measuring true north azimuth based on a theodolite proposed in this invention.

[0032] Figure 3 This invention proposes a measuring device and method for measuring true north azimuth based on a theodolite. Figure 2 A magnified structural diagram at point A;

[0033] Figure 4 This is a schematic diagram of the main structure of the adjustment component of the measuring device and method for measuring true north azimuth based on a theodolite proposed in this invention.

[0034] Figure 5 This invention proposes a measuring device and method for measuring true north azimuth based on a theodolite. Figure 2 A magnified structural diagram at point B;

[0035] Figure 6 The application provides a measuring device and a measuring method for measuring a true north azimuth angle based on a theodolite Figure 1 The application provides an enlarged structure diagram of the C of the theodolite.

[0036] Figure 7 The application provides a main structure diagram of a clamping piece of the measuring device and the measuring method for measuring a true north azimuth angle based on a theodolite.

[0037] Figure 8 The application provides an internal structure diagram of the electric push rod of the measuring device and the measuring method for measuring a true north azimuth angle based on a theodolite.

[0038] Legend:

[0039] 1, fixed frame; 2, fixed block; 3, placing table; 4, theodolite device; 5, fixed angle ruler; 6, movable angle ruler; 7, balance bar; 8, fixed rod; 9, cavity; 10, rotating shaft; 11, arc-shaped rod; 12, extension plate; 13, inner rotating bearing; 14, limiting ring; 15, limiting bolt; 16, sliding groove; 17, sliding rod; 18, sliding groove; 19, sliding block; 20, connecting rod; 21, adjusting groove; 22, adjusting bolt; 23, stop block; 24, bevel gear one; 25, rotating drum one; 26, rotating rod; 27, bevel gear two; 28, rotating drum two; 29, fixed cylinder; 30, handle; 31, positioning scale; 32, return spring; 33, clamping block; 34, stop ring; 35, moving groove; 36, clamping groove; 37, horizontal sensor; 38, display control screen; 39, fixed bolt; 40, infrared height sensor; 41, mounting hole; 42, electric push rod; 43, supporting block; 61, abutting block; 301, center hole. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0041] Reference Figures 1-8The application provides a measuring device for measuring a true north azimuth based on a theodolite, which comprises a fixing frame 1, a fixing block 2 fixedly connected to one side of the top of the fixing frame 1, a driving assembly arranged in the fixing block 2, a placing table 3 fixedly connected to the top of the driving assembly, a theodolite device 4 clamped to the top of the placing table 3, a fixed angle ruler 5 arranged at the bottom of the placing table 3, a movable angle ruler 6 arranged at the top of the fixing block 2, a balance bar 7 fixedly connected to the other side of the top of the fixing frame 1, a fixing rod 8 fixedly connected to the side of the top of the fixing frame 1 close to the balance bar 7, an adjusting assembly arranged in the fixing rod 8, a central hole 301 formed in the middle of the placing table 3, a supporting block 61 arranged at one end of the top of the balance bar 7, and the true north direction is marked by a rented gyro theodolite, then the absolute O point is marked by the driving assembly, the position of the fixed angle ruler 5 is adjusted by the adjusting assembly, so that the fixed angle ruler 5 is fixed in the true north direction, then the theodolite device 4 and the movable angle ruler 6 are driven to rotate by the driving assembly, then the measurement of the true north azimuth is observed by the theodolite device 4, when the driving assembly is damaged, the operator separates the driving assembly by cooperation, manually rotates the movable angle ruler 6, moves the cross wire on the theodolite device 4 to the vertical line of the movable angle ruler 6 by the adjusting knob on the theodolite device 4, and measures the true north azimuth, and the movable angle ruler 6 can be finely adjusted by the supporting block 61 when the movable angle ruler 6 is manually rotated.

[0042] The driving assembly comprises a cavity 9 formed in the surface of the fixing block 2, a rotating shaft 10 rotatably connected to the top of the inner wall of the cavity 9, an arc-shaped rod 11 fixedly connected to the top of the rotating shaft 10, an extension plate 12 fixedly connected to the end of the fixed angle ruler 5 close to the arc-shaped rod 11, two limiters connected with the extension plate 12 and arranged on the outer profiles of the two arc-shaped rods 11 close to the top, the limiters comprising an inner rotating bearing 13 rotatably connected with the outer profile of the arc-shaped rod 11 close to the top, the outer profile of the inner rotating bearing 13 connected with the extension plate 12, a limiting ring 14 fixedly connected to the outer profile of the inner rotating bearing 13 close to the bottom, a limiting bolt 15 arranged at the bottom of the limiting ring 14, the adjusting assembly comprising a sliding groove 16 formed in the fixing rod 8, a sliding rod 17 limitingly and slidably connected to the inner wall of the sliding groove 16, a sliding groove 18 formed in the top of the sliding rod 17, a sliding block 19 slidably connected to the top inner wall of the sliding groove 18, a connecting rod 20 fixedly connected to the top of the sliding block 19, an adjusting groove 21 formed in the surface of the fixed angle ruler 5 close to the connecting rod 20 and used for clamping the connecting rod 20, an adjusting bolt 22 arranged in the inner wall of the adjusting groove 21 and screwed with the connecting rod 20 at the bottom, a stop block 23 fixedly connected to the end of the sliding rod 17 away from the sliding block 19 and limitingly and slidably connected to the inner wall of the sliding groove 16,

[0043] Firstly, the rented gyrotheod is placed on the top of the placing table 3, the limiting bolt 15 is removed by using the wrench, then the true north direction is measured by the gyrotheod, and because the vertical line of the fixed angle ruler 5 is connected with the arc-shaped rod 11 through the extension plate 12, the absolute O point is conveniently marked, at this time, the extension plate 12 is rotated around the arc-shaped rod 11, so that the fixed angle ruler 5 is marked in the true north direction, after the marking is completed, the adjusting groove 21 opened on the fixed angle ruler 5 is aligned with the connecting rod 20, the fixed angle ruler 5 and the connecting rod 20 are fixed by using the adjusting bolt 22, the sliding rod 17 in the sliding groove 16 is fastened by using the fastening screw on the side of the fixed rod 8, finally, the removed limiting bolt 15 is installed on the extension plate 12, at this time, the marking of the true north direction is completed, and when the sliding rod 17 moves outward in the sliding groove 16, the sliding rod 17 can be limited by the stop block 23, so that the sliding rod 17 is prevented from being separated from the fixed rod 8.

[0044] The driving assembly further comprises a bevel gear one 24 fixedly connected at the bottom of the rotating shaft 10, a rotating drum one 25 connected with the top of the inner wall of the cavity 9 is arranged at the outer edge of the top of the bevel gear one 24, a rotating rod 26 is rotatably connected to the side of the cavity 9, the other end of the rotating rod 26 is fixedly connected with a bevel gear two 27, a rotating drum two 28 is arranged on the bevel gear two 27 close to the side of the rotating rod 26, a fixed cylinder 29 rotatably connected with the rotating drum two 28 is arranged on one side of the inner wall of the cavity 9, a handle 30 is fixedly connected to one end of the rotating rod 26, a clamping piece is arranged on the outer contour of the rotating drum two 28, a stop ring 34 is fixedly connected to one end of the rotating drum two 28 close to the inner wall of the fixed cylinder 29, the stop ring 34 is limitingly and slidably connected with the inner wall of the fixed cylinder 29, after the true north direction is calibrated, the rented gyrotheod is disassembled from the theodolite device 4, then the gyrotheod is returned, the theodolite device 4 is installed on the top of the placing table 3, the laser on the theodolite device 4 is aligned with the center hole 301 and irradiated on the O point, the O point is parallel to the vertical line of the movable angle ruler 6, the theodolite lower base is adjusted, so that the theodolite laser is perpendicular to the O point, at this time, the handle 30 drives the rotating rod 26 to rotate, the bevel gear one 24 meshingly connected with the bevel gear two 27 is rotated through the rotating rotating rod 26, the movable angle ruler 6 on the arc-shaped rod 11 and the placing table 3 are rotated by using the bevel gear one 24, then the vertical line of the movable angle ruler 6 is observed by the theodolite device 4, so that the true north azimuth is measured.

[0045] The clamping piece comprises a reset spring 32 arranged in the inner cavity of the fixed cylinder 29 and sleeved with the rotating rod 26, the top of the outer contour of the rotating cylinder two 28 is fixedly connected with a clamping block 33, the top of the outer contour of the fixed cylinder 29 is provided with a moving groove 35 for sliding connection of the clamping block 33, one side of the inner wall of the moving groove 35 is provided with a clamping groove 36, the clamping groove 36 is provided with a groove away from the inner wall of the moving groove 35 for clamping of the clamping block 33, the top of the side wall of the fixed block 2 close to the rotating rod 26 and the handle 30 away from one end of the bevel gear two 27 are provided with a positioning scale 31, after damage of the driving assembly, the operator rotates the handle 30 to align the positioning scale 31 on the handle 30 with the positioning scale 31 provided on the fixed block 2, so that the clamping block 33 on the rotating cylinder two 28 is aligned with the moving groove 35 provided on the fixed cylinder 29, at this time, the operator pulls the handle 30 outward to drive the bevel gear two 27 at the end of the rotating rod 26 to move outward, so that the bevel gear two 27 drives the rotating cylinder two 28 to move to the fixed cylinder 29, so that the clamping block 33 enters the moving groove 35, then the rotating rod 26 is rotated, so that the clamping block 33 moves in the clamping groove 36, when it moves to the groove provided in the clamping groove 36, the groove clamps the clamping groove 36, at this time, the movable angle ruler 6 is manually rotated, the theodolite device 4 is adjusted to rotate, the cross wire on the theodolite device 4 is moved to the vertical line of the movable angle ruler 6 to measure the true north azimuth, and when the operator rotates the movable angle ruler 6 by hand, the abutting block 61 is at about zero degrees in the north direction, so that the movable angle ruler 6 can better keep zero degrees, if the movable angle ruler 6 is not at zero degrees in the north direction, the abutting block 61 can be moved left and right to adjust the movable angle ruler 6, and because the fixed frame 1 is fixed, with the passage of time, the movable angle ruler 6 is prone to deviate from zero degrees in the north direction, when calibration is needed, the abutting block 61 is adjusted to drive the movable ruler to return to zero degrees.

[0046] The bottom of the fixed block 2 is fixedly connected with a horizontal sensor 37, the surface of the fixed frame 1 is fixedly connected with a display control screen 38, the outer wall of the support rod close to the bottom of the fixed frame 1 is fixedly connected with an infrared height sensor 40, the bottom of the support rod of the fixed frame 1 is provided with a mounting hole 41, the top of the inner wall of the mounting hole 41 is fixedly connected with an electric push rod 42, the bottom of the electric push rod 42 is fixedly connected with a supporting block 43, the top of the electric push rod 42 is fixedly connected with a fixing bolt 39, and the top of the inner wall of the mounting hole 41 is provided with a threaded groove for screwing of the fixing bolt 39;

[0047] When the fixed frame 1 is placed in the designated position, the horizontal angle of the fixed frame 1 is detected by the horizontal sensor 37, and when the fixed frame 1 is not in the horizontal position, the inclined angle electrical signal is transmitted to the display control screen 38 by the horizontal sensor 37, and the length required to adjust each electric push rod 42 on the fixed frame 1 is calculated when the fixed frame 1 is leveled by the display control screen 38, and then the four electric push rods 42 are started to adjust the length of the support block 43 at the bottom of the four electric push rods 42 in turn, so as to adjust the fixed frame 1 to the horizontal position.

[0048] Referring to Figures 1-8 A use method of a measuring device and a measuring method for measuring a true north azimuth based on a theodolite, steps are as follows:

[0049] S1, place the rented gyro theodolite on the top of the placement table 3, remove the limiting bolt 15 with a wrench, then measure the true north direction through the gyro theodolite, and because the vertical edge of the longitudinal line of the fixed angle ruler 5 is connected with the arc-shaped rod 11 through the extension plate 12 and the arc-shaped rod 11, it is convenient to mark the absolute O point, at this time, the operator rotates the extension plate 12 around the arc-shaped rod 11, so as to mark the fixed angle ruler 5 at the true north direction, after the marking is completed, the adjustment slot 21 opened on the fixed angle ruler 5 is aligned with the connecting rod 20, the fixed angle ruler 5 and the connecting rod 20 are fixed by using the adjusting bolt 22, and then the removed limiting bolt 15 is installed on the extension plate 12, at this time, the marking of the true north direction is completed;

[0050] S2, take back the rented gyro theodolite, install the theodolite device 4 on the top of the placement table 3, and irradiate the center hole 301 of the laser on the O point on the theodolite device 4, and the O point is parallel to the longitudinal line of the movable angle ruler 6, adjust the lower base of the theodolite, so that the theodolite laser is perpendicular to the O point, at this time, rotate the rotating rod 26 to drive the bevel gear one 24 connected with the bevel gear two 27 to rotate, use the bevel gear one 24 to drive the movable angle ruler 6 on the arc-shaped rod 11 and the placement table 3 to rotate, and then observe the longitudinal line of the movable angle ruler 6 through the theodolite device 4 to measure the true north azimuth;

[0051] S3, after the driving assembly is damaged, pull the bevel gear two 27 outward to drive the rotating drum two 28 to move to the fixed cylinder 29, so that the clamping block 33 enters the moving slot 35, then rotate the rotating rod 26 to make the clamping block 33 move in the clamping slot 36, when the clamping block 33 moves to the groove in the clamping slot 36, the clamping slot 36 is clamped through the groove, at this time, manually rotate the movable angle ruler 6, and then adjust the lower base of the theodolite device 4 to make the theodolite device 4 rotate, move the cross hair on the theodolite device 4 to the longitudinal line of the movable angle ruler 6 to measure the true north azimuth.

[0052] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A measuring device for measuring true north azimuth using a theodolite, comprising a fixed frame (1), characterized in that: A fixing block (2) is fixedly connected to one side of the top of the fixing frame (1). A driving component is provided inside the fixing block (2). A placement platform (3) is fixedly connected to the top of the driving component. A theodolite device (4) is snapped onto the top of the placement platform (3). A fixed angle ruler (5) is provided at the bottom of the placement platform (3). A movable angle ruler (6) is provided at the top of the fixing block (2). A balance bar (7) is fixedly connected to the other side of the top of the fixing frame (1). A fixing rod (8) is fixedly connected to the side of the top of the fixing frame (1) near the balance bar (7). An adjustment component is provided inside the fixing rod (8). A center hole (301) is opened in the middle of the placement platform (3). A support block (61) is provided at one end of the top of the balance bar (7). An adjustment mechanism is provided at the bottom of the (1).

2. The measuring device for measuring true north azimuth based on a theodolite according to claim 1, characterized in that: The drive assembly includes a cavity (9) formed on the surface of the fixed block (2). A rotating shaft (10) is rotatably connected to the top of the inner wall of the cavity (9). An arc-shaped rod (11) is fixedly connected to the top of the rotating shaft (10). An extension plate (12) is fixedly connected to one end of the fixed angle ruler (5) near the arc-shaped rod (11). Limiting members connected to the extension plate (12) are provided on the outer contours of the two arc-shaped rods (11) near the top.

3. The measuring device for measuring true north azimuth based on a theodolite according to claim 2, characterized in that: The drive assembly also includes a bevel gear (24) fixedly connected to the bottom of the rotating shaft (10). A rotating cylinder (25) connected to the top of the inner wall of the cavity (9) is provided at the outer edge of the top of the bevel gear (24). A rotating rod (26) is rotatably connected to the side of the cavity (9). A bevel gear (27) is fixedly connected to the other end of the rotating rod (26). A rotating cylinder (28) is provided on the side of the bevel gear (27) near the rotating rod (26). A fixed cylinder (29) rotatably connected to the rotating cylinder (28) is provided on one side of the inner wall of the cavity (9). A handle (30) is fixedly connected to one end of the rotating rod (26). A snap-fit ​​component is provided on the outer contour of the rotating cylinder (28).

4. The measuring device for measuring true north azimuth based on a theodolite according to claim 2, characterized in that: The limiting component includes an inner rotating bearing (13) that is rotatably connected to the outer contour of the arc-shaped rod (11) near its top. The outer contour of the inner rotating bearing (13) is connected to the extension plate (12). A limiting ring (14) is fixedly connected to the outer contour of the inner rotating bearing (13) near its bottom. A limiting bolt (15) is provided at the bottom of the limiting ring (14).

5. The measuring device for measuring true north azimuth based on a theodolite according to claim 1, characterized in that: The adjustment assembly includes a sliding groove (16) formed on a fixed rod (8), a sliding rod (17) is slidably connected to the inner wall of the sliding groove (16), a sliding groove (18) is formed at the top of the sliding rod (17), a slider (19) is slidably connected to the inner wall of the top of the sliding groove (18), and a connecting rod (20) is fixedly connected to the top of the slider (19).

6. The measuring device for measuring true north azimuth based on a theodolite according to claim 5, characterized in that: The fixed angle ruler (5) has an adjustment groove (21) through which the connecting rod (20) is inserted on the surface near the connecting rod (20). An adjustment bolt (22) is provided on the inner wall of the adjustment groove (21), and the bottom of the adjustment bolt (22) is threadedly connected to the connecting rod (20).

7. The measuring device for measuring true north azimuth based on a theodolite according to claim 3, characterized in that: The snap-fit ​​component includes a return spring (32) that is sleeved with the rotating rod (26) in the inner cavity of the fixed cylinder (29). A snap-fit ​​block (33) is fixedly connected to the top of the outer contour of the rotating cylinder (28). A moving groove (35) for the snap-fit ​​block (33) to slide is opened on the top of the outer contour of the fixed cylinder (29). A snap-fit ​​groove (36) is opened on one side of the inner wall of the moving groove (35). A groove for the snap-fit ​​block (33) to snap-fit ​​is opened in the inner wall of the snap-fit ​​groove (36) away from the moving groove (35). A positioning scale (31) is opened on the side wall of the fixed block (2) near the top of the rotating rod (26) and on the handle (30) away from the bevel gear (27). A retaining ring (34) is fixedly connected to the end of the rotating cylinder (28) near the inner wall of the fixed cylinder (29). The retaining ring (34) is slidably connected to the inner wall of the fixed cylinder (29).

8. A measuring device for measuring true north azimuth based on a theodolite according to claim 5, characterized in that: A stop (23) is fixedly connected to one end of the sliding rod (17) away from the slider (19), and the stop (23) is slidably connected to the inner wall of the sliding groove (16).

9. A measuring device for measuring true north azimuth based on a theodolite according to claim 3, characterized in that: A horizontal sensor (37) is fixedly connected to one side of the bottom of the fixed block (2). A display control screen (38) is fixedly connected to the surface of the fixed frame (1). An infrared height sensor (40) is fixedly connected to the outer wall of the support rod near the bottom of the fixed frame (1). The support rod of the fixed frame (1) is provided with mounting holes (41) at the bottom. An electric push rod (42) is fixedly connected to the top of the inner wall of the mounting hole (41). A support block (43) is fixedly connected to the bottom of the electric push rod (42). A fixing bolt (39) is fixedly connected to the top of the electric push rod (42). A threaded groove for the fixing bolt (39) to be screwed in is provided on the top of the inner wall of the mounting hole (41).

10. A measurement method based on a theodolite for measuring true north azimuth according to claims 1-9, comprising the following steps: S1. Place the rented gyro theodolite on the top of the placement platform (3), remove the limiting bolt (15) with a wrench, and then determine the true north direction using the gyro theodolite. Since the vertical edge of the fixed angle ruler (5) is connected to the arc rod (11) through the extension plate (12), it is convenient to mark the absolute O point. At this time, the operator rotates the extension plate (12) around the arc rod (11) to mark the fixed angle ruler (5) in the true north direction. After the marking is completed, align the adjustment groove (21) on the fixed angle ruler (5) with the connecting rod (20) in the center, and use the adjustment bolt (22) to fix the fixed angle ruler (5) and the connecting rod (20). Then install the removed limiting bolt (15) on the extension plate (12). At this time, the marking of the true north direction is completed. S2. Install the theodolite device (4) on the top of the placement platform (3), align the laser on the theodolite device (4) with the center hole (301) and irradiate the O point, while the O point is parallel to the longitudinal plane of the support block (61). Adjust the lower base of the theodolite so that the theodolite laser is perpendicular to the O point. At this time, rotate the rotating rod (26) to drive the bevel gear one (24) that meshes with the bevel gear two (27) to rotate. Use the bevel gear one (24) to drive the movable angle ruler (6) on the arc rod (11) and the placement platform (3) to rotate. Then observe the longitudinal line of the movable angle ruler (6) through the theodolite device (4) to measure the true north azimuth. S3. After the drive component is damaged, pull the bevel gear two (27) outward to drive the rotating cylinder two (28) to move towards the fixed cylinder (29), so that the locking block (33) enters the moving groove (35). Then rotate the rotating rod (26) to make the locking block (33) move in the locking groove (36). When it moves to the groove opened in the locking groove (36), it locks the locking groove (36) through the groove. At this time, manually rotate the movable angle ruler (6), and then adjust the base of the theodolite device (4) to make the theodolite device (4) rotate. By moving the crosshairs on the theodolite device (4) to the longitudinal line of the movable angle ruler (6), the true north azimuth is measured.

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