CN115143372A

CN115143372A - Automatic leveling device of ruler for surveying and mapping

Info

Publication number: CN115143372A
Application number: CN202210805497.9A
Authority: CN
Inventors: 李兴东; 董辉; 李中培; 孙伟清; 范大波; 孙国强; 王国强; 张鹏
Original assignee: Hangzhou Polytechnic
Current assignee: Hangzhou Polytechnic
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-10-04

Abstract

The invention discloses an automatic leveling device of a ruler for surveying and mapping, which comprises a base, wherein a plurality of supporting cones are arranged at the bottom of the base, a vertical ruler is rotatably connected to the top of the base, two inclined telescopic mechanisms are symmetrically hinged to the top of the base, and one ends of the two telescopic mechanisms, which are far away from the base, are respectively hinged to the ruler; the utility model discloses a two-way screw rod, two screw thread blocks, two arc briquetting and two sliding trays, two arc briquetting are inconsistent with two moving mechanism respectively, the top of scale is provided with the controller on being provided with inclination sensor, the side of scale, and inclination sensor and controller electric connection, the inside of base has been seted up and has been held the storehouse, is provided with two adjustment mechanism in holding the storehouse, and adjustment mechanism contains two-way screw rod, two screw thread blocks, two arc briquetting and two sliding trays. The invention can solve the technical problems that the prior surveying and mapping sliding staff maintains the vertical state of the sliding staff through manual control, has poor stability, is difficult to keep for a long time, brings great errors to measurement, cannot adjust the height and has inconvenient movement during multi-point measurement.

Description

Automatic leveling device of ruler for surveying and mapping

Technical Field

The invention belongs to the technical field of detection tools, and particularly relates to an automatic leveling device of a ruler for surveying and mapping.

Background

The ordinary surveying and mapping sliding staff is controlled manually to maintain the vertical state of the sliding staff, the stability of the method is poor, the method is difficult to maintain for a long time, a digital level gauge is matched with a bar code differentiation leveling staff, the bar codes are distributed according to a certain principle, the most important characteristic is that the reading is automatically read by an instrument, the ordinary level gauge is obtained by reading the position of a sight line on the ruler, the i angle of the digital level gauge is connected with the center of a CCD, the optical level gauge is related with the sight line, and if the ruler cannot be vertically erected, a large error is brought to measurement. In addition, the flattening work of present bar code chi mainly is artifical through the length that the regulation chi propped, observes the bubble position of circle level ware, reaches the purpose of bar code chi flattening, and is very time-consuming and hard, and it is very inconvenient often to remove when the multiple spot is measured simultaneously, and in addition, the height of present ordinary survey and drawing sopwith staff is difficult for adjusting, can't adapt to the not measurement requirement of co-altitude.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an automatic leveling device of a ruler for surveying and mapping.

In order to achieve the purpose, the invention adopts the technical scheme that:

an automatic leveling device of a ruler for surveying and mapping comprises a base, wherein a plurality of supporting cones are arranged at the bottom of the base, a height adjusting mechanism is arranged at the top of the base, a vertical ruler is rotatably connected to the top of the height adjusting mechanism, two inclined telescopic mechanisms are symmetrically hinged to the top of the height adjusting mechanism, and one ends, far away from the base, of the two telescopic mechanisms are respectively hinged to the ruler;

the top of the scale is provided with a tilt angle sensor, the side surface of the scale is provided with a controller, and the tilt angle sensor is electrically connected with the controller.

Preferably, the telescopic mechanism is an electric push rod, and a driving motor in the electric push rod is electrically connected with the controller.

Preferably, the base is provided with a containing bin inside, and two adjusting mechanisms are arranged in the containing bin.

Preferably, adjustment mechanism contains two-way lead screw, two screw blocks, two arc briquetting and two sliding trays, two-way lead screw transversely sets up in the inside that holds the storehouse, and the both ends of two-way lead screw run through the both sides face of base respectively, and two sliding trays symmetry respectively are seted up on the top lateral wall that holds the storehouse, and two screw blocks symmetry respectively set up on two-way lead screw, and the sliding tray sliding connection that the top of two screw blocks corresponds with the top respectively, and two arc briquetting set up respectively in the bottom of two screw blocks, and two arc briquetting are inconsistent with two moving mechanism respectively.

Preferably, every moving mechanism contains bracing piece, universal wheel, two connecting blocks and multiunit compression spring, the vertical inside that sets up in holding the storehouse of bracing piece, the arc briquetting that the top and the top of bracing piece correspond are inconsistent, the bottom of bracing piece runs through the bottom of base and extends to the outside of base, the universal wheel sets up in the bottom of bracing piece, two connecting blocks symmetry respectively set up in the top of bracing piece leading flank and trailing flank, multiunit compression spring sets up between the connecting block and the bottom inner wall that holds the storehouse, every compression spring's of group one end is connected with the bottom of connecting block, the other end and the bottom interior wall connection that holds the storehouse.

Preferably, the top of the supporting rod is provided with an arc-shaped supporting block matched with the arc surface radian of the arc-shaped pressing block.

Preferably, the lowest part of the cambered surface of the cambered pressure block is provided with a limiting block.

Preferably, the height adjusting mechanism comprises a mounting seat, a lifting mechanism, a driving mechanism and a supporting disk, the mounting seat is arranged at the top of the base, the driving mechanism is arranged on the mounting seat, the supporting disk is arranged above the mounting seat, the bottoms of the telescopic mechanism and the scale are respectively hinged with the top of the supporting disk, the supporting disk is of an inverted round platform structure, the lifting mechanism is arranged between the supporting disk and the mounting seat, and the lifting mechanism is connected with the driving mechanism.

Preferably, actuating mechanism contains installation cavity, screw rod, thread block, connecting block, sliding tray and servo motor, the installation cavity is seted up in the inside of mount pad, the sliding tray is seted up in the top of mount pad, and the bottom of sliding tray is linked together with the installation cavity, the screw rod transversely sets up in the inside of installation cavity, the one end of screw rod is connected with one side inner wall rotation of installation cavity, the other end runs through the mount pad and extends to the outside of mount pad, be provided with a supporting bench on the lateral surface of mount pad, servo motor sets up on a supporting bench, the screw rod is located the outside one end of mount pad and servo motor's output shaft fixed connection, the thread block sets up on the screw rod, the connecting block sets up in the top of thread block, the sliding tray slip can be followed to the connecting block.

Preferably, elevating system contains lifter, catch bar, spacing ring and two bearing bars, the catch bar sets up in the top of mount pad, and the bottom and the connecting block fixed connection of catch bar, two bearing bars are "L" type structure of falling, the bottom of the vertical end of two bearing bars respectively with the top fixed connection of mount pad, the spacing ring sets up between two bearing bars, and the tip of two bearing bar horizontal ends is connected with the spacing ring respectively, the lifter activity sets up in the inside of spacing ring, the top of lifter is connected with the bottom of supporting disk is perpendicular, the bottom can contact with the top of mount pad, the catch bar is the trapezium structure, the bottom of lifter be provided with the inclined plane assorted inclined plane with the catch bar.

Preferably, every all be provided with supplementary supporting mechanism between the top of bearing bar and the bottom of supporting disk, supplementary supporting mechanism contains a support section of thick bamboo and support column, supports a section of thick bamboo and sets up in the top of bearing bar, and the support column sets up in the bottom of supporting disk, supports the top of a section of thick bamboo and pegs graft with the top of support column.

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the invention, through the design of the base and the plurality of supporting cones, the scale can be stably erected without manually holding the scale to be erected, so that the manpower is saved;

(2) According to the invention, through the combined design of the tilt angle sensor, the telescopic mechanism and the controller, the tilt angle of the scale can be automatically detected through the tilt angle sensor, so that the length of the telescopic mechanism can be more accurately adjusted, the tilt angle of the scale can be more accurately adjusted, the scale is in a vertical state, and the measurement error is reduced;

(3) According to the device, through the combined design of the adjusting mechanism and the moving mechanism, when the device is required to be moved, the universal wheels are moved downwards to be in contact with the ground, so that the device is convenient to move through the universal wheels;

(4) According to the height adjusting device, through the design of the height adjusting mechanism, the height of the whole device can be adjusted, so that the initial measuring height of the ruler can be adjusted, different measuring requirements can be met, and the practicability of the surveying and mapping ruler is improved.

Drawings

Fig. 1 is a schematic structural diagram of an automatic leveling device of a surveying and mapping ruler according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an automatic leveling device of a surveying and mapping ruler according to an embodiment of the present invention, in which a base is in a cross-sectional state;

fig. 3 is a schematic structural view of the automatic leveling device of the surveying and mapping ruler according to the embodiment of the present invention, in which the base is in a cross-sectional state and the universal wheels are in contact with the ground;

FIG. 4 is a right side view of the base of FIG. 2;

FIG. 5 is a cross-sectional view of a height adjustment mechanism in an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the height adjustment mechanism of an embodiment of the present invention after adjusting the height of the device;

in the figure: 1. a base; 2. a support cone; 3. a scale; 4. a telescoping mechanism; 5. a tilt sensor; 6. a controller; 7. an accommodating bin; 8. a bidirectional screw rod; 9. a thread block; 10. an arc-shaped pressing block; 11. a sliding groove; 12. a support bar; 13. a universal wheel; 14. connecting blocks; 15. a compression spring; 16. an arc-shaped supporting block; 17. a limiting block; 18. a handle; 19. a support disc; 20. a mounting seat; 21. a load-bearing bar; 22. a support cylinder; 23. a support pillar; 24. a limiting ring; 25. a lifting rod; 26. a push rod; 27. a screw; 28. a servo motor; 29. a support table; 30. a mounting cavity; 31. a sliding groove; 32. connecting blocks; 33. and a thread block.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1 to 6, the automatic leveling device of the ruler for surveying and mapping provided by the embodiment of the invention comprises a base 1, wherein a plurality of supporting cones 2 are arranged at the bottom of the base 1, a height adjusting mechanism is arranged at the top of the base 1, a vertical ruler 3 is rotatably connected to the top of the height adjusting mechanism, two inclined telescopic mechanisms 4 are symmetrically hinged to the top of the height adjusting mechanism, one ends of the two telescopic mechanisms 4 far away from the base 1 are respectively hinged to the ruler 3, and the connecting pieces of the hinge modes can be hinges, pin shafts or universal joints and any conventional structure which can realize rotatable connection;

the top of the scale 3 is provided with the tilt sensor 5, the side surface of the scale 3 is provided with the controller 6, the tilt sensor 5 is electrically connected with the controller 6, the model of the tilt sensor 5 in the embodiment of the invention is SCA100, the controller 6 can specifically adopt a single chip microcomputer, the single chip microcomputer adopts a chip STC12C4204AD, the single chip microcomputer has an AD conversion function, and a 5V power supply is adopted for supplying power.

The telescopic mechanism 4 is an electric push rod, and a driving motor in the electric push rod is electrically connected with the controller 6.

Base 1's inside has been seted up and has been held storehouse 7, holds and is provided with two adjustment mechanism in the storehouse 7.

Adjustment mechanism contains two-way lead screw 8, two screw blocks 9, two arc briquetting 10 and two sliding tray 11, two-way lead screw 8 transversely sets up in the inside that holds storehouse 7, and the both ends of two-way lead screw 8 run through the both sides face of base 1 respectively, two sliding tray 11 symmetry respectively are seted up on the top lateral wall that holds storehouse 7, two screw blocks 9 symmetry respectively set up on two-way lead screw 8, the sliding tray 11 sliding connection that the top of two screw blocks 9 corresponds with the top respectively, two arc briquetting 10 set up respectively in the bottom of two screw blocks 9, two arc briquetting 10 are inconsistent with two moving mechanism respectively, the one end of two-way lead screw 8 is provided with the pivoted handle 18 of being convenient for.

Every moving mechanism contains bracing piece 12, universal wheel 13, two connecting blocks 14 and

multiunit compression spring

15, 12 vertical settings in the inside that holds storehouse 7 of bracing piece, the arc briquetting 10 that the top of bracing piece 12 corresponds with the top is inconsistent, the bottom of bracing piece 12 runs through base 1's bottom and extends to base 1's the outside, universal wheel 13 sets up in the bottom of bracing piece 12, two connecting blocks 14 symmetry respectively set up in the top of 12 leading flank of bracing pieces and trailing flank, multiunit compression spring 15 sets up between connecting block 14 and the bottom inner wall that holds storehouse 7, the one end of every compression spring 15 of group is connected with connecting block 14's bottom, the other end and the bottom wall connection that holds storehouse 7. The design of compression spring 15 can make bracing piece 12 move up and have certain cushion effect when moving down to can improve the stability that bracing piece 12 moved up and moved down, the design of arc briquetting 10 can make and have an inclined plane that contacts between screw block 9 and the bracing piece 12, and then can be when screw block 9 removes, presses down bracing piece 12, thereby realizes moving down of universal wheel 13.

The top of the support rod 12 is provided with an arc-shaped support block 16 matched with the arc-shaped radian of the arc-shaped pressing block 10. The design of arc supporting shoe 16 can with the cambered surface phase-match of arc briquetting 10 to make contact surface between them can be better contact, thereby can be when universal wheel 13 supports with ground, arc briquetting 10 has stable pressing force to bracing piece 12, has improved universal wheel 13's slip stability.

The lowest part of the cambered surface of the cambered block 10 is provided with a limiting block 17. The effect of stopper 17 is spacing screw thread piece 9, avoids screw thread piece 9 excessive movement and breaks away from mutually with bracing piece 12 to be unfavorable for the stability that universal wheel 13 moved down and supported.

Height adjusting mechanism contains mount pad 20, elevating system, actuating mechanism and supporting disk 19, mount pad 20 sets up in the top of base 1, actuating mechanism sets up on mount pad 20, supporting disk 19 sets up in the top of mount pad 20, the bottom of telescopic system and scale 3 is articulated with the top of supporting disk 19 respectively, supporting disk 19 is "round platform" type structure, supporting disk 19 designs to "round platform" type structure down, can increase the area of contact of telescopic system and scale 3 with supporting disk 19, and then increased the support steadiness, elevating system sets up between supporting disk 19 and mount pad 20, elevating system and actuating mechanism are connected.

Actuating mechanism contains mounting chamber 30, screw rod 27, thread block 33, connecting block 32, sliding tray 31 and servo motor 28, mounting chamber 30 is seted up in the inside of mount pad 20, sliding tray 31 is seted up at the top of mount pad 20, and sliding tray 31's bottom is linked together with mounting chamber 30, screw rod 27 transversely sets up in the inside of mounting chamber 30, screw rod 27's one end and one side inner wall of mounting chamber 30 rotate to be connected, the other end runs through mount pad 20 and extends to the outside of mount pad 20, be provided with brace table 29 on the lateral surface of mount pad 20, servo motor 28 sets up on brace table 29, screw rod 27 is located the outside one end of mount pad 20 and servo motor 28's output shaft fixed connection, thread block 33 sets up on screw rod 27, connecting block 32 sets up in the top of thread block 33, connecting block 32 can follow sliding tray 31 and slide.

Elevating system contains lifter 25, catch bar 26, spacing ring 24 and two bearing bar 21, catch bar 26 sets up in the top of mount pad 20, and catch bar 26's bottom and connecting block 32 fixed connection, two bearing bar 21 are "L" type structure of falling, the bottom of the vertical end of two bearing bar 21 respectively with the top fixed connection of mount pad 20, spacing ring 24 sets up between two bearing bar 21, and the tip of two bearing bar 21 horizontal ends is connected with spacing ring 24 respectively, the lifter 25 activity sets up in the inside of spacing ring 24, the top of lifter 25 is connected perpendicularly with the bottom of supporting disk 19, the bottom can contact with the top of mount pad 20, catch bar 26 is the trapezium structure, the bottom of lifter 25 is provided with the inclined plane assorted inclined plane with catch bar 26.

Specifically, when the bottom of the lifting rod 25 contacts with the top of the mounting base 20, the height of the device is the lowest value of the height required by surveying and mapping, when the height of the device, namely the initial measurement height of the scale 3, needs to be increased, the screw 27 is driven to rotate by starting the servo motor 28, the connecting block 32 is limited by the side wall of the sliding groove 31, the thread block 33 can only move left and right along the screw 27, and then the push rod 26 connected with the connecting block 32 is driven to move left, when the push rod 26 moves left and contacts with the bottom inclined plane of the lifting rod 25, the push rod 26 moves left and continues to move, under the left and right limiting effects of the limiting ring 24, the lifting rod 25 gradually moves upwards along the inclined plane of the push rod 26 to move vertically, and then drives the supporting disk 19 and the scale 3 to move upwards, when the initial measurement point of the scale 3 reaches the required height, the servo motor 28 is closed, and the height adjustment is completed.

Every all be provided with supplementary supporting mechanism between the top of bearing bar 21 and the bottom of supporting disk 19, supplementary supporting mechanism contains a support section of thick bamboo 22 and support column 23, and a support section of thick bamboo 22 sets up in the top of bearing bar 21, and support column 23 sets up in the bottom of supporting disk 19, and the top of a support section of thick bamboo 22 is pegged graft with the top of support column 23. The design of auxiliary mechanism can further increase the support steadiness to supporting disk 19, when avoiding lifter 25 to contact with mount pad 20, because the lifter 25 bottom is the inclined plane, and the condition that causes to support unstably appears, and then influences the straightness that hangs down of scale.

When the automatic leveling device for the surveying and mapping ruler provided by the embodiment of the invention is used, the ruler is pushed, the device provided by the embodiment of the invention is moved through the universal wheel 13, when the device is moved to a position to be measured, the universal wheel 13 is locked, then the bidirectional screw rod 8 is rotated through the handle, the two thread blocks 9 are driven to move in the direction away from each other, the two arc pressing blocks 10 connected below are driven to move in the opposite directions along with the movement of the two thread blocks 9, the pressure on the supporting rod 12 is gradually weakened along with the movement of the arc pressing blocks 10, the supporting rod 12 gradually moves upwards under the action of the restoring force of the compression spring 15 to drive the universal wheel 13 to move upwards, when the universal wheel 13 is separated from the ground, the bidirectional screw rod 8 stops rotating, the base 1 and the ruler 3 are supported through the supporting cone, then the vertical state of the ruler is detected through the inclination angle sensor 5, a signal is output to the controller 6, and the controller 6 controls the driving motor in the electric push rod 4 to rotate forwards or backwards, so as to extend or shorten the screw rod in the electric push rod 4, and automatically realize the vertical adjustment of the ruler; when the height of the whole device needs to be adjusted, the servo motor 28 is started to drive the screw 27 to rotate, the connecting block 32 is limited by the side wall of the sliding groove 31, so that the thread block 33 can only move left and right along the screw 27, and further the push rod 26 connected with the connecting block 32 is driven to move left, when the push rod 26 moves left and contacts with the bottom inclined plane of the lifting rod 25, the push rod 26 moves left and continues to move, under the left and right limiting action of the limiting ring 24, the lifting rod 25 gradually moves upwards along the inclined plane of the push rod 26 to drive the supporting disk 19 and the scale 3 to move upwards, when the initial measuring point of the scale 3 reaches the required height, the servo motor 28 is closed, and the height adjustment is completed.

In conclusion, the automatic leveling device of the ruler for surveying and mapping in the embodiment of the invention can enable the ruler to be stably upright through the design of the base and the plurality of supporting cones, and does not need to manually hold the ruler to maintain the ruler upright, thereby saving manpower; through the combined design of the tilt angle sensor, the telescopic mechanism and the controller, the tilt angle of the scale can be automatically detected through the tilt angle sensor, so that the length of the telescopic mechanism can be more accurately adjusted, the tilt angle of the scale can be more accurately adjusted, the scale is in a vertical state, and the measurement error is reduced; meanwhile, through the combined design of the adjusting mechanism and the moving mechanism, when the device disclosed by the invention needs to be moved, the universal wheels are moved downwards to be in contact with the ground, so that the device is convenient to move through the universal wheels.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An automatic leveling device of a ruler for surveying and mapping is characterized by comprising a base (1), wherein a plurality of supporting cones (2) are arranged at the bottom of the base (1), a height adjusting mechanism is arranged at the top of the base (1), a vertical ruler (3) is rotatably connected to the top of the height adjusting mechanism, two inclined telescopic mechanisms (4) are symmetrically hinged to the top of the height adjusting mechanism, and one ends, far away from the base (1), of the two telescopic mechanisms (4) are respectively hinged to the ruler (3);

the top of scale (3) is provided with inclination sensor (5), is provided with controller (6) on the side of scale (3), and inclination sensor (5) and controller (6) electric connection.

2. The automatic leveling device of the ruler for surveying and mapping according to claim 1, wherein the two telescoping mechanisms (4) are both electric push rods, and driving motors in the electric push rods are respectively electrically connected with the controller (6).

3. The automatic leveling device of the ruler for surveying and mapping according to claim 1, wherein the base (1) is provided with a containing bin (7) inside, and two adjusting mechanisms are arranged in the containing bin (7).

4. The automatic leveling device of the surveying and mapping ruler according to claim 3, wherein the adjusting mechanism comprises a bidirectional screw rod (8), two thread blocks (9), two arc-shaped pressing blocks (10) and two sliding grooves (11), the bidirectional screw rod (8) is transversely disposed inside the accommodating bin (7), two ends of the bidirectional screw rod (8) respectively penetrate through two side surfaces of the base (1), the two sliding grooves (11) are respectively symmetrically formed on the side wall of the top of the accommodating bin (7), the two thread blocks (9) are respectively symmetrically disposed on the bidirectional screw rod (8), the tops of the two thread blocks (9) are respectively in sliding connection with the corresponding sliding grooves (11) above, the two arc-shaped pressing blocks (10) are respectively disposed at the bottoms of the two thread blocks (9), and the two arc-shaped pressing blocks (10) respectively abut against the two moving mechanisms.

5. The automatic leveling device of the ruler for surveying and mapping according to claim 4, wherein each moving mechanism comprises a support rod (12), a universal wheel (13), two connecting blocks (14) and a plurality of sets of compression springs (15), the support rod (12) is vertically arranged inside the accommodating bin (7), the top of the support rod (12) is in contact with the arc-shaped pressing block (10) corresponding to the upper side, the bottom of the support rod (12) penetrates through the bottom of the base (1) and extends to the outer side of the base (1), the universal wheel (13) is arranged at the bottom of the support rod (12), the two connecting blocks (14) are respectively and symmetrically arranged at the top of the front side and the back side of the support rod (12), the plurality of sets of compression springs (15) are arranged between the connecting blocks (14) and the inner wall of the bottom of the accommodating bin (7), one end of each set of compression spring (15) is connected with the bottom of the connecting block (14), and the other end of each set of compression spring is connected with the inner wall of the bottom of the accommodating bin (7).

6. The automatic leveling device of the surveying and mapping ruler according to claim 5, wherein the top of the supporting rod (12) is provided with an arc-shaped supporting block (16) matched with the arc-shaped radian of the arc-shaped pressing block (10), and the lowest part of the arc-shaped surface of the arc-shaped pressing block (10) is provided with a limiting block (17).

7. The automatic leveling device of the surveying and mapping ruler of claim 1, wherein the height adjusting mechanism comprises a mounting base (20), a lifting mechanism, a driving mechanism and a supporting plate (19), the mounting base (20) is arranged on the top of the base (1), the driving mechanism is arranged on the mounting base (20), the supporting plate (19) is arranged above the mounting base (20), the bottoms of the telescopic mechanism and the ruler (3) are respectively hinged with the top of the supporting plate (19), the supporting plate (19) is of an inverted round platform structure, the lifting mechanism is arranged between the supporting plate (19) and the mounting base (20), and the lifting mechanism is connected with the driving mechanism.

8. The automatic leveling device of the surveying and mapping ruler of claim 7, wherein the driving mechanism comprises a mounting cavity (30), a screw rod (27), a thread block (33), a connecting block (32), a sliding groove (31) and a servo motor (28), the mounting cavity (30) is arranged inside the mounting seat (20), the sliding groove (31) is arranged at the top of the mounting seat (20), the bottom of the sliding groove (31) is communicated with the mounting cavity (30), the screw rod (27) is transversely arranged inside the mounting cavity (30), one end of the screw rod (27) is rotatably connected with the inner wall of one side of the mounting cavity (30), the other end of the screw rod penetrates through the mounting seat (20) and extends to the outside of the mounting seat (20), a supporting table (29) is arranged on the outer side surface of the mounting seat (20), the servo motor (28) is arranged on the supporting table (29), one end of the screw rod (27) located outside the mounting seat (20) is fixedly connected with an output shaft of the servo motor (28), the thread block (33) is arranged on the screw rod (27), and the connecting block (32) is arranged on the top of the sliding groove (31).

9. The automatic leveling device of the surveying and mapping ruler of claim 8, wherein the lifting mechanism comprises a lifting rod (25), a pushing rod (26), a limiting ring (24) and two bearing rods (21), the pushing rod (26) is disposed on the top of the mounting seat (20), the bottom of the pushing rod (26) is fixedly connected with the connecting block (32), the two bearing rods (21) are of an inverted "L" shaped structure, the bottoms of the vertical ends of the two bearing rods (21) are respectively fixedly connected with the top of the mounting seat (20), the limiting ring (24) is disposed between the two bearing rods (21), the ends of the horizontal ends of the two bearing rods (21) are respectively connected with the limiting ring (24), the lifting rod (25) is movably disposed inside the limiting ring (24), the top of the lifting rod (25) is vertically connected with the bottom of the supporting disk (19), the bottom can be contacted with the top of the mounting seat (20), the pushing rod (26) is of a trapezoidal structure, and the bottom of the lifting rod (25) is provided with an inclined plane matched with the inclined plane of the pushing rod (26).

10. The automatic leveling device of the surveying and mapping ruler according to claim 8, wherein an auxiliary support mechanism is disposed between the top of each bearing rod (21) and the bottom of the support plate (19), the auxiliary support mechanism comprises a support cylinder (22) and a support column (23), the support cylinder (22) is disposed on the top of the bearing rod (21), the support column (23) is disposed on the bottom of the support plate (19), and the top of the support cylinder (22) is inserted into the top of the support column (23).