CN114542914A

CN114542914A - Adjustable supporting device for surveying instrument

Info

Publication number: CN114542914A
Application number: CN202210197499.4A
Authority: CN
Inventors: 程钢; 张科谦; 张连波; 王红根; 宗训培; 杜少飞; 张广飞; 刘瑞芳; 许庆福; 张振波
Original assignee: Henan University of Technology
Current assignee: Henan University of Technology
Priority date: 2022-03-02
Filing date: 2022-03-02
Publication date: 2022-05-27
Anticipated expiration: 2042-03-02
Also published as: CN114542914B

Abstract

The invention relates to an adjustable supporting device of a surveying instrument, which solves the problems of troublesome operation and difficult adjustment of centering and leveling of the supporting frame of the conventional surveying instrument; the device comprises a fixed table, a horizontal pipe is fixedly installed in the fixed table, buoys are installed in the horizontal pipe in a sliding mode, a first moving plate is installed at the bottom of the fixed table, a second moving plate is installed at the bottom of the first moving plate in a sliding mode, supporting devices are evenly distributed on the circumference of the bottom of the second moving plate, vertical blocks are installed at the bottom of the fixed table in a ball hinge mode, centering devices are installed in the vertical blocks, and the level is judged through scale comparison of the four buoys in the horizontal pipe; the displacement of the center of the fixed station and the displacement of the measuring station are determined to be transverse and longitudinal movement, the displacement position is judged by matching the cotton rope with the sliding resistance card, and the displacement position is accurately measured by measuring the ball and the electrode plate in the groove plate, so that the precision measurement is realized.

Description

Adjustable supporting device for surveying instrument

Technical Field

The invention relates to the technical field of surveying and mapping auxiliary equipment, in particular to an adjustable supporting device for a surveying and mapping instrument.

Background

The surveying instrument is designed and manufactured for surveying work, and performs operations such as data acquisition, processing, output and the like, and generally, the surveying instrument is one of indispensable instruments in various aspects such as orientation, level, centering, distance measurement, height measurement, photogrammetry and the like required by measurement work in planning, designing, construction and operation management stages in engineering construction; the existing surveying and mapping support device only judges whether a surveying and mapping instrument needs to be centered through holes of human eyes only by the holes of the support device when the existing surveying and mapping support device is centered, so that the accurate positioning cannot be achieved, and the time is wasted on positioning movement; the existing support frame adopts a three-support form, but when the levelness of a fixed disk on the support frame is adjusted, the levelness of the three support frames needs to be adjusted repeatedly, the repeated adjustment wastes time, and when the levelness is viewed, the existing bubble level meter has large errors and large scales; during ordinary adjustment, centering is firstly carried out, then leveling is carried out, but after centering usually occurs, a centering point can deviate during leveling, and then during centering, a horizontal point can deviate again;

in view of the above, we provide an adjustable supporting device for a surveying instrument to solve the above problems.

Disclosure of Invention

Aiming at the situation and overcoming the defects of the prior art, the invention provides an adjustable supporting device of a surveying instrument, which is provided with two horizontal tubes, a movable plate and a supporting device which are vertically arranged, wherein buoys are arranged in the horizontal tubes, so that the accurate horizontal adjustment from four directions is realized; the vertical block and the fixed cylinder are arranged, the fixed cylinder is fixed on a station to be measured through a wire rope, and the fixed table is moved to achieve accurate centering by measuring the sliding position of a ball in the groove plate and the sliding resistance value of the wire rope during pulling.

Strutting arrangement with adjustable mapping instrument, its characterized in that, including the fixed station, the inside fixed mounting of fixed station has horizontal pipe and horizontal intraductal slidable mounting to have the buoy, first movable plate and first movable plate bottom slidable mounting have the second movable plate are installed to the fixed station bottom, strutting arrangement is installed to second movable plate bottom circumference equipartition, install centering device in perpendicular piece and the perpendicular piece in the fixed station bottom ball joint.

Preferably, a first screw rod is installed in the first movable plate in a rotating mode and installed in a matched mode with the fixed platform through threads, a second screw rod is installed in the second movable plate in a rotating mode and installed in a matched mode with the first movable plate through threads, and a clamping device is fixedly installed inside the fixed platform.

Preferably, the supporting device comprises a plurality of first supporting rods which are installed in a ball-hinged mode with the second movable plate, a driving motor is fixedly installed in each first supporting rod, a third lead screw is installed in each first supporting rod in a rotating mode, the third lead screw is in threaded fit with a second supporting rod installed in each first supporting rod in a sliding mode, and a pedal is installed on the side wall of the fixed rod and the side wall of the fixed rod in a ball-hinged mode at the bottom of each second supporting rod.

Preferably, the centering device comprises a fixed cylinder fixedly installed at the bottom of the vertical block, two groups of symmetrical slotted holes are uniformly distributed on the inner circumference of the fixed cylinder, wire fixing blocks slidably installed in the slotted holes are connected in the slotted holes through extension springs, sliding resistance sheets are installed on the inner side walls of the slotted holes and are in sliding fit with the wire fixing blocks, the wire fixing blocks are connected with fixed blocks through cords, a measuring groove plate is fixedly installed inside the vertical block, and balls are installed inside the measuring groove plate in a rolling mode.

Preferably, the inside hole of placing and placing the hole lateral wall of seting up of solid fixed cylinder rotate and install a plurality of hasps, the coaxial rotation of hasp installs the torsional spring, it has the board that resets of slidable mounting in the inside reset hole to set up reset hole and reset hole in the solid fixed cylinder to be connected with through reset spring.

Preferably, clamping device includes the inside electric telescopic handle of fixed mounting at the fixed station, electric telescopic handle top fixed mounting has fixed disk and fixed disk circumference equipartition to install a plurality of bevel gears, bevel gear coaxial fixation has the rotation to install in the fourth lead screw of fixed disk and fourth lead screw-thread fit has sliding mounting in the backup pad of fixed station, the backup pad rotates installs back-off and back-off bottom through first spring coupling in the backup pad.

Preferably, the electrode plates are installed on the inner side wall of the measuring groove plate and are in contact with the balls, a plurality of electrode plates are installed on the inner bottom wall of the measuring groove plate at intervals, and a plurality of fixing teeth are evenly distributed on the circumference of the bottom wall of the fixing block.

Preferably, the outer side wall of the horizontal pipe is provided with scales.

The beneficial effects of the technical scheme are as follows:

(1) the device is provided with two vertical and communicated horizontal pipes and four support frames corresponding to the horizontal pipes, one direction is leveled by adjusting the opposite support frames, the support rods are driven by the screws to stretch and retract in the support frames, the accuracy is higher, and then the other direction is leveled by the other two support frames, so that the adjustment of the fixed table is realized, and the accuracy and the stability are higher;

(2) setting a vertical block and a fixed cylinder, wherein a fixed line block which is arranged in the fixed cylinder in a sliding way is fixed at a measuring station through a thread rope, the fixed line block slides on a sliding resistor by pulling the thread rope, the sliding resistance value is measured, the position of a ball in a measuring groove plate arranged on the vertical block on an electrode plate is measured, the bottom of the measuring groove plate is in an inclined state, the deviation of the vertical block is judged, then the ball in the transverse or longitudinal measuring groove plate is firstly positioned at the same position through a moving plate, the resistance value is the same, coarse centering is carried out through the resistance value, accurate centering is carried out through the ball and the electrode plate, and the positions of the balls in the two vertically arranged measuring groove plates are the same through the movement of the moving plate, namely the centering position is reached;

(3) the clamping device is arranged, the instrument is placed on the surface of the fixing table, the four bevel gears synchronously rotate, the back-off buckling instrument is enabled to be fastened until the trigger device in the back-off is triggered, the electric telescopic rod is enabled to be contracted, the back-off buckling instrument is pulled downwards, the instrument is further fixed, and the instrument is prevented from shaking; set up the fixed block, make the interior cotton rope of solid fixed cylinder fix at surveying the website, gu the fixed cylinder is inside to set up the hasp, can place the fixed block inside gu the fixed cylinder, conveniently carry.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a centering device according to the present invention;

FIG. 3 is a schematic cross-sectional view of a centering device according to the present invention;

FIG. 4 is an enlarged view of part A of the present invention;

FIG. 5 is an enlarged view of a portion B of the present invention;

FIG. 6 is an enlarged view of a portion C of the present invention;

FIG. 7 is a schematic view of the moving plate structure of the present invention;

FIG. 8 is a schematic view of a clamping device according to the present invention;

FIG. 9 is an enlarged view of a portion D of the present invention;

FIG. 10 is a schematic view of a fixing block according to the present invention;

FIG. 11 is a schematic view of the supporting device of the present invention;

fig. 12 is a schematic view of the locking structure of the present invention.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 12. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

The embodiment provides an adjustable supporting device for a surveying and mapping instrument, and is shown in the attached

drawings

1 and 3, and comprises a fixed table 1, wherein a horizontal tube 2 is fixedly arranged in the fixed table 1, a buoy 3 is arranged in the horizontal tube 2 in a sliding manner, the horizontal tube 2 is vertically arranged, the horizontal tube 2 is communicated, scales are arranged on the outer side wall of the horizontal tube 2, a first movable plate 4 is arranged at the bottom of the fixed table 1, a second movable plate 5 is arranged at the bottom of the first movable plate 4 in a sliding manner, supporting devices are uniformly distributed and arranged on the circumference of the bottom of the second movable plate 5, the supporting devices are respectively arranged and matched with the horizontal tube 2 in an installing manner, a vertical block 6 is arranged at the bottom of the fixed table 1 in a ball hinge manner, and a centering device is arranged in the vertical block 6;

a first screw rod 7 is rotatably mounted in the first movable plate 4, the first screw rod 7 is installed in a matched mode with the fixed table 1 through threads, a first motor fixedly mounted on the side wall of the first movable plate 4 is coaxially and fixedly mounted on the first screw rod 7, the first motor is electrically connected to the microcontroller, a second screw rod 8 is rotatably mounted in the second movable plate 5, the second screw rod 8 is installed in a matched mode with the first movable plate 4 through threads, a second motor fixedly mounted on the side wall of the second movable plate 5 is coaxially and fixedly mounted on the second screw rod 8, the second motor is electrically connected to the microcontroller, and a clamping device is fixedly mounted inside the fixed table 1;

in an initial state, floating balls in the horizontal tubes 2 are positioned at the same scale position under the action of water, the fixed table 1 is positioned in the middle of the first movable plate 4, the first movable plate 4 is positioned in the middle of the second movable plate 5, the fixed table 1 is uniformly provided with four horizontal tubes 2, and the bottom of the second movable plate 5 is uniformly provided with four supporting devices; when the device is used, the supporting devices are manually opened, a certain angle is opened to enable the supporting devices to be supported on the ground, the device is suitable for various grounds, whether the buoys 3 in the four horizontal pipes 2 are in the same scale or not is observed, if the fixed platform 1 is in an inclined state, the two supporting devices on one side in the opposite direction can be adjusted, one supporting device extends out, the other supporting device contracts, and the fixed platform 1 rotates around the middle lines of the other two supporting devices until the buoys 3 in the horizontal pipes 2 on one side in the opposite direction are in the same scale; then, the buoys 3 in the two corresponding horizontal pipes 2 are adjusted by adjusting the other two supporting devices until the scales of the buoys 3 in the four horizontal pipes 2 are the same; at the moment, whether the central position of the fixed table 1 is positioned right above a plumb line of the station to be measured can be determined through the centering device, if the central position deviates from the plumb line of the station to be measured, the deviation direction can be observed through the centering device, then the fixed table 1 can longitudinally and transversely move through the first screw rod 7 and the second screw rod 8 until the centering device enables the central position of the fixed table 1 to be positioned right above the plumb line of the station to be measured; after centering and leveling are finished, the surveying and mapping instrument can be placed on the upper wall of the fixed table 1, and then the surveying and mapping instrument is clamped by the clamping device, so that the surveying and mapping can be carried out; after the device is used or when the device is moved, the clamping device is opened, the instrument is taken out, the supporting device is contracted, and the device is directly moved.

The supporting device comprises a plurality of first supporting rods 9 which are arranged in a ball-hinged mode with the second moving plate 5, a driving motor 10 is fixedly arranged in each first supporting rod 9, the driving motor 10 rotates to be provided with a third lead screw 11, the driving motor 10 is electrically connected to the microcontroller, the third lead screw 11 is in threaded fit with a second supporting rod 12 which is slidably arranged inside the first supporting rod 9, and a fixed rod 13 and a pedal 14 are arranged on the side wall of the fixed rod 13 in a ball-hinged mode at the bottom of the second supporting rod 12.

In an initial state, the second support rod 12 is contracted inside the first support rod 9 by the rotation of the third screw rod 11, when the device is used, firstly the driving motor 10 drives the third screw rod 11 to start, so that the second support rod 12 extends out for a certain distance, the fixed rod 13 is rotated to a proper angle, and the fixed rod 13 is fixed on the ground by stepping on the pedal 14 (the fixed rod 13 and the second support rod 12 have large friction force, so that the second support rod 12 can not be easily rotated), then the driving motor 10 drives the third screw rod 11 in the first support rod 9 corresponding to the horizontal tube 2 to be adjusted, the third screw rod 11 with high scale of the buoy 3 in the horizontal tube 2 at one side is reversely rotated, the second support rod 12 is contracted, the third screw rod 11 with low scale of the buoy 3 in the horizontal tube 2 is forwardly rotated, so that the second support rod 12 slides out of the first support rod 9 until the buoys 3 in the two horizontal tubes 2 are at the same scale position, then, the second support rod 12 is extended and contracted to adjust the graduation position of the buoy 3 in the other two horizontal pipes 2.

The centering device comprises a fixed cylinder 15 fixedly arranged at the bottom of a vertical block 6, two groups of symmetrical slotted holes 16 are uniformly distributed on the inner circumference of the fixed cylinder 15, the slotted holes 16 are internally connected with wire fixing blocks 18 which are slidably arranged in the slotted holes 16 through extension springs 17, sliding resistance sheets 19 are arranged on the inner side walls of the slotted holes 16, the sliding resistance sheets 19 are in sliding fit with the wire fixing blocks 18, the sliding resistance sheets 19 are electrically connected with a microcontroller (the sliding resistance sheets are the same as sliding resistors and slide on the surfaces of the resistors, the resistance values of the sliding resistance sheets can be changed), when the wire fixing blocks 18 are pulled, the sliding distance of the wire fixing blocks 18 in the slotted holes 16 can be judged according to the values of the sliding resistance sheets 19, the wire fixing blocks 18 are connected with fixed blocks 20 through cords (as shown in figure 2), a measuring slotted plate 21 is fixedly arranged in the vertical block 6, balls 22 are arranged in the measuring slotted plate 21 in a rolling manner, and the bottom plate and two side plates are arranged in an inclined manner, and because the inclination angle is large, the ball 22 can not roll when the measuring groove plate 21 inclines; when the measuring groove plate 21 is inclined, the ball 22 slides in the measuring groove plate 21, and the included angle between the bottom plate of the measuring groove plate 21 and one side wall is smaller than 90 degrees, so that the ball 22 always leans against the inner side wall of the measuring groove plate 21; electrode plates are installed on the inner side wall of the measuring groove plate 21 and are in contact with the ball 22, a plurality of electrode plates are installed on the inner bottom wall of the measuring groove plate 21 at intervals, the ball 22 is in point contact with the electrode plates to form a passage, the position of a bottom electrode plate in contact with the ball 22 can be measured, the interval and the width of the electrode plates can be set to be smaller, the smaller the interval and the width of the electrode plates are, the more accurate the adjustment and the centering are, the electrode plates are electrically connected to a microcontroller, each electrode plate arranged on a bottom plate at intervals is connected to the microcontroller through a circuit, when the ball 22 rolls to the position of the bottom electrode plate, the passage is formed by the electrode plates on the side walls and the electrode plates at the bottom of the ball 22, the offset position of the ball 22 can be judged through the circuit, a plurality of fixing teeth 36 are evenly installed on the circumference of the bottom wall of the fixing block 20, and the fixing block 20 can be fixed on the ground through the fixing teeth 36 manually;

in the initial state, the wire rope in the wire fixing block 18 is in a relaxed state and is not connected with the fixed block 20, the extension spring 17 is in a normal state, when the device is used, the fixed block 20 is fixed at the position of a station measuring point, then the wire rope connected with the bottom of the wire fixing block 18 is fixed at the central position of the fixed block 20, and the vertical block 6 rotates along with the wire rope under the action of the wire rope; then, firstly, carrying out horizontal leveling, then judging the pulling direction of the cords and the pulling force of each cord according to the values of the four groups of sliding resistance pieces 19, wherein the smaller the value of the downward sliding resistance piece 19 of the fixed cord piece 18 is according to the position of the tensile fixed cord piece 18 of the cord on one opposite side on the sliding resistance piece 19, the larger the pulling force of the cord is, the more the sliding of the cord needs to be carried out in the pulling direction of the cord, the transverse or longitudinal movement of the fixed platform 1 is realized through the first screw rod 7 and the second screw rod 8 until the positions of the tensile fixed cord pieces 18 on the sliding resistance piece 19 on the two opposite sides are the same, namely the values of the sliding resistance pieces 19 are the same; then, according to the other two cords pulling the cord fixing blocks 18 at the positions of the sliding resistance sheets 19, the transverse or longitudinal moving distance of the fixed table 1 is adjusted, and the two cords pulling the fixed blocks 20 to stop at the same positions of the sliding resistance sheets 19; the judgment of the resistance value on the sliding resistance sheet 19 may be only roughly performed for centering, if precision equipment placement or precision measurement in engineering is required, after rough centering, the microcontroller judges the positions of the electrode plates at the bottom of the two balls 22 in the measurement groove plate 21, if one ball 22 leans against the bottom and the transverse side wall, and the other ball 22 does not contact the transverse side wall, which indicates that the fixed table 1 has deviation and is cheap in the direction of the contact position of the ball 22 and the transverse side wall, the screw in the direction can be driven to rotate, so that the fixed table 1 moves in the opposite direction of the contact position of the ball 22 and the transverse side wall until the electrode plates at the bottom contacted by the two balls 22 are the same; then, the contact positions of the two balls 22 in the other measuring groove plate 21 perpendicular to the measuring groove plate 21 and the bottom electrode plate can be observed, and further, the fixed table 1 is positioned right above the vertical direction of the measuring station by adjusting through a screw rod in a moving plate in the direction of the measuring groove plate 21, so that the aim of centering is achieved.

A placing hole 23 is formed in the fixed cylinder 15, a plurality of lock catches 24 are rotatably mounted on the side wall of the placing hole 23, each lock catch 24 is in a barb shape, a torsion spring 25 is coaxially and rotatably mounted on each lock catch 24, a reset hole 26 is formed in the fixed cylinder 15, and each reset hole 26 is connected with a reset plate 28 which is slidably mounted in each reset hole 26 through a reset spring 27;

in an initial state, the latch 24 rotates towards the inside of the placing hole 23 under the action of the torsion spring 25, the return spring 27 is in a normal state, the fixed block 20 is placed in the placing hole 23, the top wall of the turned fixed block 20 contacts with the latch 24 and is prevented from being in the placing hole 23 under the action of the latch 24, when the electronic device is used, the bottom wall of the return plate 28 is manually pressed, the return plate 28 slides towards the return hole 26, the upper part of the turned latch 24 rotates towards the placing hole 23 while the return plate 28 slides, the bottom of the turned latch 24 rotates towards the direction far away from the placing hole 23, the latch 24 leaves the top wall of the fixed block 20, the fixed block 20 slides out of the placing hole 23 under the action of gravity, and is manually fixed at a station measuring position, at the moment, the return plate 28 is manually loosened, the return plate 28 returns to the initial state under the action of the return spring 27, and the latch 24 returns to the initial state under the action of the torsion spring 25; after the use, the fixed block 20 is manually taken out, after the fixed block is turned, the fixed block is prevented from being placed in the hole 23, meanwhile, the side wall of the fixed block 20 extrudes the side wall of the lock catch 24, the lock catch 24 rotates in the direction away from the hole 23 until the fixed block 20 slides to the hole 23 and leaves the lock catch 24, and the lock catch 24 slides in the direction of the hole 23 under the action of the torsion spring 25 and is buckled on the top wall of the fixed block 20 again.

The clamping device comprises an electric telescopic rod 29 fixedly installed inside a fixed table 1, a fixed disc 30 is fixedly installed at the top of the electric telescopic rod 29, a plurality of bevel gears 31 are evenly distributed on the circumference of the fixed disc 30, the electric telescopic rod 29 is electrically connected with a microcontroller, the bevel gears 31 at adjacent positions are mutually meshed to enable one bevel gear 31 to rotate, the other bevel gear 31 synchronously rotates, the bevel gear 31 is coaxially fixed with a fourth screw 32 rotatably installed on the fixed disc 30, the fourth screw 32 is in threaded fit with a supporting plate 33 slidably installed on the fixed table 1, the fourth screw 32 is coaxially and fixedly connected with a fourth motor fixedly installed in the fixed disc 30, the fourth motor is electrically connected with the microcontroller, the supporting plate 33 is rotatably installed with an inverted buckle 34, the bottom of the inverted buckle 34 is connected with the supporting plate 33 through a first spring 35, the inverted buckle 34 is formed by installing a first spring 35 on the side wall of the inverted hook-shaped supporting plate 33, and the first trigger switch is electrically connected with the microcontroller, when the bottom of the reverse buckle 34 rotates towards the direction of the first spring 35 until the bottom contacts the side wall of the supporting plate 33, the first trigger switch is triggered;

in the initial state, the electric telescopic rod 29 is in the extending state, and the bottom of the reverse buckle 34 rotates towards the direction away from the support plate 33 under the action of the first spring 35, so that the reverse buckle 34 is in the extending state; when in use, the instrument is manually placed on the upper wall of the fixed table 1, then the fourth motor is driven to start, the fourth motor drives the fourth screw rod 32 to rotate, the fourth screw rod 32 rotates to enable the supporting plate 33 to slide towards the central position of the fixed table 1, meanwhile, the fourth screw 32 drives the bevel gears 31 to rotate, the bevel gears 31 drive the adjacent bevel gears 31 to rotate, simultaneously drives all the fourth screw rods 32 on the fixed disc 30 to rotate, so that the support plate 33 slides towards the central position of the fixed table 1 until the upper part of the reverse buckle 34 contacts the bottom of the instrument, the supporting plate 33 continues to slide, the reverse buckle 34 rotates under the blocking of the instrument, the first spring 35 is compressed until the reverse buckle 34 contacts the side wall of the supporting plate 33, the first trigger switch is triggered, the electric telescopic rod 29 is contracted, the fixed disc 30 slides downwards, the top of the reverse buckle 34 is buckled at the bottom of the instrument and moves downwards, the instrument is fixed, and the instrument is prevented from shaking; after the use, the electric telescopic rod 29 stretches, the reverse buckle 34 rises, the fourth motor drives the fourth screw rod 32 to rotate reversely, the bevel gear 31 rotates reversely, the supporting plate 33 slides in the direction away from the instrument, the initial state is recovered, and the instrument is manually taken away.

The above description is only for the purpose of illustrating the present invention, and it should be understood that the present invention is not limited to the above embodiments, and various modifications conforming to the spirit of the present invention are within the scope of the present invention.

Claims

1. Strutting arrangement with adjustable mapping instrument, its characterized in that, including fixed station (1), the inside fixed mounting of fixed station (1) has level pipe (2) and level pipe (2) slidable mounting to have buoy (3), first movable plate (4) and first movable plate (4) bottom slidable mounting have second movable plate (5) are installed to fixed station (1) bottom, strutting arrangement is installed to second movable plate (5) bottom circumference equipartition, install centering device in perpendicular piece (6) and perpendicular piece (6) in fixed station (1) bottom ball joint.

2. The adjustable supporting device for the surveying instrument according to claim 1, wherein a first screw rod (7) is rotatably mounted on the first moving plate (4) and the first screw rod (7) is mounted in a matching manner with the fixed platform (1) through threads, a second screw rod (8) is rotatably mounted on the second moving plate (5) and the second screw rod (8) is mounted in a matching manner with the first moving plate (4) through threads, and a clamping device is fixedly mounted inside the fixed platform (1).

3. The adjustable supporting device for the surveying instrument according to claim 1, wherein the supporting device comprises a plurality of first supporting rods (9) mounted with the second moving plate (5) in a ball-hinged manner, a driving motor (10) is fixedly mounted in the first supporting rods (9), a third screw rod (11) is rotatably mounted on the driving motor (10), a second supporting rod (12) slidably mounted inside the first supporting rod (9) is in threaded fit with the third screw rod (11), a fixing rod (13) is rotatably mounted at the bottom of the second supporting rod (12) in a ball-hinged manner, and a pedal (14) is mounted on the side wall of the fixing rod (13).

4. The adjustable supporting device for the surveying instrument according to claim 1, wherein the centering device comprises a fixed cylinder (15) fixedly mounted at the bottom of the vertical block (6), two sets of symmetrical slots (16) are uniformly distributed on the inner circumference of the fixed cylinder (15), a wire fixing block (18) slidably mounted in the slot (16) is connected in the slot (16) through an extension spring (17), a sliding resistance sheet (19) is mounted on the inner side wall of the slot (16), the sliding resistance sheet (19) is slidably matched with the wire fixing block (18), the wire fixing block (18) is connected with a fixed block (20) through a wire rope, a measuring slot plate (21) is fixedly mounted inside the vertical block (6), and a ball (22) is rotatably mounted inside the measuring slot plate (21).

5. The adjustable supporting device for the surveying instrument according to claim 4, wherein a placing hole (23) is formed in the fixed cylinder (15), a plurality of latches (24) are rotatably mounted on the side wall of the placing hole (23), a torsion spring (25) is coaxially rotatably mounted on the latches (24), and a reset hole (26) is formed in the fixed cylinder (15), and the reset hole (26) is connected with a reset plate (28) slidably mounted in the reset hole (26) through a reset spring (27).

6. The adjustable supporting device for the surveying instrument according to claim 2, wherein the clamping device comprises an electric telescopic rod (29) fixedly installed inside the fixing table (1), a fixed disc (30) and a plurality of bevel gears (31) are rotatably installed on the top of the electric telescopic rod (29) in a circumferential uniform distribution manner, the bevel gears (31) are coaxially fixed with a supporting plate (33) which is rotatably installed on a fourth screw rod (32) of the fixed disc (30) in a sliding manner and is slidably installed on the fixing table (1) in a threaded fit manner, and an inverted buckle (34) and the inverted buckle (34) are rotatably installed on the supporting plate (33) and are connected to the supporting plate (33) through a first spring (35) at the bottom of the supporting plate (33).

7. The adjustable supporting device for the surveying instrument according to claim 1, wherein electrode plates are mounted on the inner side wall of the measuring groove plate (21) and are in contact with the balls (22), a plurality of electrode plates are mounted on the inner bottom wall of the measuring groove plate (21) at intervals, and a plurality of fixing teeth (36) are uniformly distributed on the circumference of the bottom wall of the fixing block (20).

8. The adjustable support device for surveying instruments according to claim 7, characterized in that the outside wall of the horizontal tube (2) is provided with graduations.