CN210981261U - A centering leveling device for engineering survey - Google Patents

Abstract

The utility model provides a centering leveling device for engineering survey belongs to the engineering survey field. It has solved the comparatively loaded down with trivial details inconvenient problem of current engineering measuring instrument centering flattening operation. This a centering leveling device for engineering survey, including the foot rest that has the mount pad, set up in the measuring instrument of mount pad top and be located the leveling mechanism between measuring instrument and the mount pad, the bottom of measuring instrument is equipped with laser centering device, still is provided with translation mechanism between mount pad and the leveling mechanism, and laser centering device includes base and suspension body, the relative measuring instrument of base is fixed, the base has the cavity, splendid attire has liquid in the cavity, the bottom of suspension body has laser emitter, suspension body suspends and makes laser emitter's laser beam vertical down all the time in the cavity. The utility model discloses only need can accomplish detecting instrument's centering flattening through thick centering, flattening, the three step of smart centering, easy operation is convenient, the easy operation of going up.

Description

A centering leveling device for engineering survey

Technical Field

The utility model belongs to the engineering survey field relates to a centering leveling device for engineering survey.

Background

When outdoor engineering measuring instruments such as theodolites, levels and the like are used for measurement, the measuring instruments must be centered and leveled first, so that the centers of the instruments and the marking centers of the measuring stations on the bottom surface are on the same plumb line, the vertical axes of the instruments are vertical, and the horizontal dial is horizontal, thereby ensuring the accuracy of measured data.

At present, most measuring instruments are centered by a laser centering device, for example, a laser centering device disclosed in chinese patent application (application No. 200320115810.9), which is fixedly installed on a base of a theodolite, a total station, a distance measuring instrument, a GPS or a target, so that the laser centering device can emit laser downward along a vertical axis direction of the measuring instrument, and a tripod for fixing the measuring instrument is moved to make a laser beam projected downward by the laser centering device coincide with a station mark on the ground, thereby completing centering. However, since the laser centering device is fixedly connected with the measuring instrument, after the theodolite is centered, the theodolite on the tripod is usually in a non-horizontal state at the moment, namely the actual direction of the laser beam is not the direction of the plumb line, the leveling operation is required at the moment, so that the measuring instrument is in a horizontal state, at the moment, along with the leveling operation of the theodolite, the direction of the laser beam is changed along with the change of the laser beam, so that the laser beam deviates from the mark of the measuring station, the centering is required again, the tripod is required to be moved for centering, and the measuring instrument on the tripod is in a non-horizontal state after the centering is carried out again, so that the ideal state can be reached by repeatedly centering and leveling operations for many times.

Therefore, when the conventional measuring instrument is centered and leveled, a beginner usually needs to last 5-10 minutes or more, a middle-skilled person needs 3-5 minutes, and the ground position needs to be changed after about 10 minutes of observation, so that a large amount of time is used for centering and leveling operation, and the overall labor efficiency of mapping is low and the labor comfort is poor.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a centering leveling device for engineering survey, the utility model aims to solve the technical problem that: how to make the centering and leveling operation of the engineering measuring instrument simpler and more convenient.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a centering leveling device for engineering survey, includes the foot rest that has the mount pad, sets up measuring instrument and the leveling mechanism that is located between measuring instrument and the mount pad in the mount pad top, the bottom of measuring instrument is equipped with laser centering device, its characterized in that, still be provided with between mount pad and the leveling mechanism and make measuring instrument along horizontal and longitudinal translation and locking's translation mechanism, laser centering device includes base and suspension body, the base is fixed relative to measuring instrument, the base has the cavity, the splendid attire has liquid in the cavity, the bottom of suspension body has laser emitter, suspension body makes laser emitter's laser beam vertical downwards all the time in the cavity.

The centering and leveling device comprises a foot rest, wherein the foot rest comprises a mounting seat and a plurality of supporting legs for supporting the mounting seat, a translation mechanism is arranged on the mounting seat, a leveling mechanism is arranged above the translation mechanism, the measuring instruments can be theodolite, level, total station and range finder, and the like, are arranged at the top of the leveling mechanism, can be adjusted to be in a horizontal state and can move in a horizontal two-dimensional plane, and meanwhile, a mechanism centering device arranged at the bottom of the measuring instrument is matched with a suspension body suspended in the base by utilizing the base filled with liquid, so that the end part of a laser emitter arranged at the bottom of the suspension body can be vertically downward all the time under the action of gravity. When the centering and leveling device is used for centering and leveling a measuring instrument, the laser emitter is firstly turned on to ensure that the measuring instrument is basically positioned above the mark of the measuring station, then the leveling mechanism is adjusted to ensure that the measuring instrument reaches the level, because the projection direction of the laser beam can not be changed along with the adjustment of the leveling mechanism, the deviation between the leveled laser beam and the station mark can not be too large, and the laser beam of the laser emitter is coincided with the station mark only by moving the position of the measuring instrument in the horizontal direction through the leveling mechanism, this centering leveling device only needs to accomplish measuring instrument's centering flattening operation through three steps of thick centering, flattening and smart centering promptly, need not the position of repeated removal foot rest, has avoided the operation that current measuring instrument need centering repeatedly and flattening, and the efficiency of whole centering flattening is higher, and operates simplyr.

The laser centering device adopts the matching of the base and the suspension body, the suspension body is suspended in the liquid, and the liquid can play a certain damping role while supporting the suspension body, so that the suspension body can be more quickly kept still, the end part of the laser emitter is vertically downward, and the centering and leveling efficiency is further improved. Moreover, the suspension body is basically positioned in the cavity of the base, and the liquid and the suspension body positioned in the base are not easily influenced by outdoor wind, so that the centering precision is ensured.

In foretell be used for engineering survey's centering flattening device, the cavity of base is the annular, and the base has opened along the axial lead of cavity and has stepped down the hole, the suspension includes the suspension portion of annular and embedding cavity, laser emitter is cylindricly, laser emitter is located the axis of suspension portion and wears to locate to step down downtheholely, the aperture of stepping down the hole is greater than laser emitter's external diameter. Therefore, the laser transmitter can be ensured to be positioned at the central position of the cavity as much as possible, and the centering precision is ensured.

In the above centering and leveling device for engineering measurement, an inner wall of the cavity opposite to the outer peripheral surface of the suspension body is arc-shaped. Therefore, when the suspension body swings relative to the cavity, the suspension body is prevented from interfering with the inner wall of the cavity, and the angle of the laser emitter is further influenced.

In the above centering and leveling device for engineering measurement, the aperture of the abdicating hole increases from top to bottom in sequence. The hole of stepping down is the flaring form, and steps down the clearance between the inner wall at hole top and the laser emitter less, and like this, the cooperation precision of laser emitter and base is higher, makes laser emitter be located the center of base as far as possible, and laser emitter can have great free swing space, and when the base was not in the horizontality, laser emitter still can keep vertical state.

In the above centering and leveling device for engineering measurement, the base is made of transparent material, and a sealing cover for sealing the cavity is further fixedly arranged on the base. The base adopts a closed structure, so that liquid and suspension are completely sealed in the cavity of the base, the liquid in the cavity is prevented from being spilled out of the cavity in the using or carrying process, and the base is made of transparent materials, so that laser emitted by the laser emitter can directly penetrate through the bottom of the base and be projected to the ground.

In the above-mentioned centering and leveling device for engineering measurement, the suspension body is further fixedly provided with a first magnetic member arranged along the circumferential direction of the suspension portion, the base is also provided with a second magnetic member arranged around the first magnetic member, and the magnetic poles of the adjacent sides of the first magnetic member and the second magnetic member are the same. Through the repulsion between the first magnetic part and the second magnetic part, a certain gap can be kept between the suspension body and the inner wall of the cavity in each circumferential direction, and the suspension body is positioned at the center of the cavity, so that the precision of the laser beam is ensured. In this design, the magnetic force of first magnetism spare and second magnetism spare can be designed weakly, only need have between the two certain repulsion can to avoid causing other influences because of magnetic force is too big.

In the above centering and leveling device for engineering measurement, the first magnetic member is a permanent magnet, and the second magnetic member is a permanent magnet or an electromagnet.

In the above-mentioned centering and leveling device for engineering survey, the laser emitter includes a housing, a power supply, a wireless communication module, a control module and a laser emitting head, the power supply, the wireless communication module and the laser emitting head are all electrically connected with the control module, and a switch for connecting with a wireless signal of the wireless communication module is arranged on the measuring instrument or the mounting base. The laser transmitter adopts an independent power supply, avoids the power supply from external wiring, and the switch arranged outside the base controls the switch of the laser transmitter through wireless communication, thereby avoiding the interference of the electric wire to the movement of the suspension body and ensuring the position precision of the laser beam.

In foretell centering leveling device for engineering survey, translation mechanism includes the bottom plate that links firmly with the mount pad, and the interval is provided with two first guide rails along horizontal extension on the bottom plate, and equal sliding connection has first sliding seat on two first guide rails, has linked firmly two second guide rails along longitudinal extension between two first sliding seats, equal sliding connection has the second sliding seat on the second guide rail, leveling mechanism sets firmly on two second sliding seats. Through first guide rail and second guide rail sliding fit, precision and stability when having guaranteed the leveling mechanism translation.

In the above centering and leveling device for engineering measurement, a first positioning bolt capable of abutting against or separating from the first guide rail is connected to the first sliding seat in a threaded manner, and a second positioning bolt capable of abutting against or separating from the second guide rail is connected to the second sliding seat in a threaded manner. Therefore, after the measuring instrument is precisely centered, the measuring instrument can be fixed by locking the first positioning bolt and the second positioning bolt.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model discloses set gradually translation mechanism and leveling mechanism on the mount pad of foot rest, the laser emitter of the laser centering device of detecting instrument bottom passes through the buoyancy of liquid and keeps the state of vertical orientation all the time, makes the utility model discloses only need can accomplish detecting instrument's centering flattening through thick centering, flattening, the three step of smart centering, need not the centering that relapses, easy operation is convenient, easy to handle.

2. The laser emitter is matched with the suspension body through the base, so that the end part of the laser emitter faces vertically downwards, liquid in the base plays a role in supporting the suspension body and also plays a role in damping, the time required by the suspension body to reach a static state is shortened, the centering and leveling efficiency is improved, the suspension body is located in the base, the suspension body is not easily affected by external factors such as outdoor wind power and the like, and the centering precision and the stability are better.

3. This laser emitter adopts independent power and connects through wireless communication and realize control to avoid passing through the connection of electric lines with the outside and influence its centering precision, centering precision and stability are better.

Drawings

Fig. 1 is a perspective view of the present invention;

FIG. 2 is a schematic structural view of a foot rest, translation mechanism and leveling structure;

FIG. 3 is a schematic view of the assembly of the translation mechanism and the flattening mechanism;

FIG. 4 is a schematic structural view of a laser centering device;

FIG. 5 is a schematic diagram of a laser transmitter;

fig. 6 is a schematic structural view of another laser centering device.

In the figure, 1, a foot rest; 11. a mounting seat; 12. supporting legs; 2. a translation mechanism; 21. a base plate; 22. a supporting seat; 23. a first guide rail; 24. a first sliding seat; 25. a second guide rail; 26. a second sliding seat; 27. positioning a first bolt; 28. a second positioning bolt; 3. a leveling mechanism; 31. a chassis; 32. a top tray; 33. adjusting the screw rod; 4. a measuring instrument; 5. a laser centering device; 6. a base; 61. a cavity; 62. a hole of abdication; 63. a second magnetic member; 7. a suspension; 71. a suspension section; 71a, a first magnetic member; 71b, a damping hole; 72. a laser transmitter; 72a, a housing; 72b, a power supply; 72c, a wireless communication module; 72d, a control module; 72e, a laser emitting head; 72f, a balancing weight; 8. a yielding channel; 9. and (7) sealing the cover.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in figures 1-3, a centering leveling device for engineering survey comprises a foot rest 1, a translation mechanism 2, a leveling mechanism 3 and a measuring instrument 4 which are sequentially connected from bottom to top along the vertical direction, wherein the measuring instrument 4 comprises a theodolite, a total station, a distance meter, a GPS or target and other common outdoor engineering surveying equipment, the foot rest 1 comprises a mounting seat 11 and a plurality of supporting legs 12 for supporting the mounting seat 11, the translation mechanism 2 is arranged on the mounting seat 11, a laser centering device 5 is arranged at the bottom of the measuring instrument 4, the laser centering device 5 comprises a base 6 and a suspension body 7, the base 6 is fixed relative to the measuring instrument 4, liquid is contained in the base 6, a laser emitter 72 is arranged at the bottom of the suspension body 7, the suspension body 7 is suspended on the liquid in the base 6, the laser beam of the laser emitter 72 is always vertically downward, and the centering leveling device only needs to pass through rough, And leveling and fine centering to finish centering and leveling operation.

Specifically, as shown in fig. 2 and 3, the translation mechanism 2 includes a bottom plate 21, the bottom plate 21 is in a square plate shape and is fixedly attached to the upper end surface of the mounting seat 11, two pairs of supporting seats 22 are disposed on the bottom plate 21, the two pairs of supporting seats 22 are respectively located at two sides of the bottom plate 21, and a rod-shaped first guide rail 23 is fixedly disposed between the two supporting seats 22 of each pair of supporting seats 22, so that the two first guide rails 23 extend transversely and are arranged at intervals. Equal sliding connection has first sliding seat 24 on two first guide rails 23, has linked firmly two second guide rails 25 along longitudinal extension between two first sliding seat 24, and equal sliding connection has second sliding seat 26 on the second guide rail 25, and leveling mechanism 3's chassis 31 links firmly on two sliding seats, and through translation mechanism 2, leveling mechanism 3 and measuring instrument 4 can be along horizontal and the interior translation of longitudinal. Meanwhile, the first sliding seat 24 is connected with a first positioning bolt 27 in a threaded manner, by screwing the first positioning bolt 27, the first positioning bolt 27 can abut against the first guide rail 23 and enables the first sliding seat 24 to be fixed on the first guide rail 23 or separated from the first guide rail 23 and the first sliding seat 24 to be unlocked, and similarly, the second sliding seat 26 is connected with a second positioning bolt 28 in a threaded manner, and the second positioning bolt 28 can abut against or be separated from the second guide rail 25 to lock or unlock the second sliding seat 26.

As shown in fig. 2 and 3, in this embodiment, the leveling mechanism 3 includes a bottom plate 31 and a top plate 32 located above the bottom plate 31, the bottom plate 31 and the top plate 32 are both disc-shaped, a plurality of adjusting screws 33 with two ends respectively in threaded connection with the top plate 32 and the bottom plate 31 are disposed between the top plate 32 and the bottom plate 31, the adjusting screws 33 are uniformly distributed at intervals along the circumferential direction of the top plate 32, in this embodiment, the number of the adjusting screws 33 is three, and the spiral directions of the threads at two ends of the adjusting screws 33 are opposite, in this embodiment, the measuring instrument 4 is detachably connected with the top plate 32 through bolts, so that the top plate 32 and the measuring instrument 4 can be brought into a horizontal state through manual adjustment. Of course, like an automatic leveling level disclosed in the chinese patent application (application No. 201720865372.X), a similar automatic leveling device may be used as the leveling mechanism 3 in the present application to achieve automatic leveling.

As shown in fig. 3 and 4, in order to project the laser beam onto the ground, the centering and leveling device has a yielding channel 8 which is arranged along the vertical direction and sequentially penetrates through the leveling mechanism 3, the translation mechanism 2 and the mounting seat 11, in this embodiment, the laser centering device 5 is arranged on the top plate 32 and located in the yielding channel 8, the laser centering device 5 includes a base 6 and a suspension body 7, wherein the base 6 is substantially bowl-shaped, the base 6 is fixedly arranged on the top plate 32 and located in the yielding channel 8, and has a cavity 61 for containing liquid, the liquid may be water or other liquid with large buoyancy, in this embodiment, the cavity 61 is annular, the base 6 is provided with a yielding hole 62 along the axial line of the cavity 61, and the inner wall of the cavity 61 opposite to the outer peripheral surface of the suspension body 7 is arc-shaped. The suspension body 7 comprises a suspension part 71 and a laser emitter 72, wherein the suspension part 71 is made of materials with larger buoyancy, such as foam or hollow plastic, the suspension part 71 is also approximately annular, the suspension part 71 is embedded into the cavity 61 and suspended in the cavity 61, the suspension part 71 and the outer side wall of the cavity 61 keep clearance fit with a smaller clearance, the laser emitter 72 is cylindrical, the laser emitter 72 is fixedly arranged at the bottom of the suspension part 71 and located on the axis of the suspension part 71, and the laser emitter 72 penetrates through the yielding hole 62. The abdicating hole 62 is in an expanded shape with the aperture increasing from top to bottom in sequence, and the aperture at the small end of the abdicating hole 62 is slightly larger than the outer diameter of the laser emitter 72, so that the laser emitter 72 can be located at the central position of the cavity 61, and the laser emitter 72 has a larger free swing space, and when the base 6 is not in a horizontal state, the laser emitter 72 can still keep a vertical state.

In this embodiment, the base 6 may be detachably connected to the top plate 32 by a snap fit, or may be directly fixed to the top plate 32.

Furthermore, a first magnetic member 71a arranged along the circumferential direction of the suspension part 71 is fixedly arranged on the suspension body 7, a second magnetic member 63 arranged around the first magnetic member 71a is also arranged on the base 6, the magnetic poles of the adjacent sides of the first magnetic member 71a and the second magnetic member 63 are the same, a certain distance is kept between the suspension body 7 and the outer side wall of the cavity 61 through the repulsive force between the first magnetic member 71a and the second magnetic member 63, the suspension body and the outer side wall of the cavity 61 are kept in a coaxial state as much as possible, the influence of the two on the angle of the laser emitter 72 due to touch is avoided, and therefore centering accuracy is guaranteed. In this embodiment, the first magnetic member 71a is a permanent magnet, and the second magnetic member 63 may be either a permanent magnet or an electromagnet. And the magnetic force between the first magnetic part 71a and the second magnetic part 63 can be designed to be small, and only the situation that the first magnetic part and the second magnetic part are not easy to touch can be ensured.

As shown in fig. 5, the laser transmitter 72 includes a housing 72a, a power supply 72b, a wireless communication module 72c, a control module 72d and a laser transmitter 72e, wherein the housing 72a is cylindrical, the power supply 72b, the wireless communication module 72c, the control module 72d and the laser transmitter 72e are all disposed in the housing 72a, the laser transmitter 72e is disposed at the bottom of the housing 72a, the power supply 72b, the wireless communication module 72c and the laser transmitter 72e are all electrically connected to the control module 72d, a switch capable of being wirelessly connected to the wireless communication module 72c is disposed on the measuring instrument 4 or the mounting base 11, a switch signal can be transmitted to the wireless communication module 72c through the switch, the wireless communication module 72c transmits a signal to the control module 72d, and the switch of the laser transmitter 72 is controlled by the control module 72 d. By adopting the structure, the suspension body 7 is prevented from being connected with the outside by arranging the electric wire, so that the suspension body 7 is prevented from being interfered in centering, and the centering is more accurate.

Further, a weight 72f is further disposed in the housing 72a, the weight 72f is annular and located at the bottom of the housing 72a, that is, the weight 72f is disposed at one end of the housing 72a where the laser emitter 72 is disposed, so that the laser emitter 72 can stably face downward vertically.

This centering leveling device when carrying out centering flattening operation, only need carry on following step can:

1. roughly centering; the laser transmitter 72 in the laser centering device 5 is turned on to project the laser beam downwardly and the foot rest 1 is moved to bring the laser beam into approximate alignment with the station mark on the ground.

2. Leveling; the leveling mechanism 3 is adjusted so that the top plate 32 is in a horizontal state.

3. Fine centering; and loosening the first positioning bolt 27 and the second positioning bolt 28 on the translation mechanism 2, then driving the leveling mechanism 3 to translate on the translation mechanism 2 by hand, aligning the laser beam emitted by the laser transmitter 72 with the station mark, locking through the first positioning bolt 27 and the second positioning bolt 28, and finally closing the laser transmitter 72.

Example two

The technical solution of this embodiment is substantially the same as that of the first embodiment, except that in this embodiment, the laser emitter 72 includes a housing 72a, a power source 72b, a switch and a laser emitting head 72e, both the switch and the laser emitting head 72e are electrically connected to the power source 72b, and the switch is disposed at the top of the housing 72a, that is, the switch is located at one end of the housing 72a far away from the laser emitting head 72 e. In use, when the measuring instrument 4 is not installed, the switch of the mechanism emitter is turned on before the measuring instrument 4 is not installed on the top plate 32, and then after the centering is completed through the centering and leveling step in the first embodiment, the switch of the laser emitter 72 is turned off, and then the measuring instrument 4 is installed to start measuring.

EXAMPLE III

As shown in fig. 6, the present embodiment is also substantially the same as the first embodiment, except that in the present embodiment, the base 6 is made of a transparent material, the base 6 is further provided with a cover 9, and the cover 9 is in threaded fit with the base 6 to seal the cavity 61. In this embodiment, the laser transmitter 72 is controlled by a wireless signal according to one embodiment. Therefore, the liquid in the base 6 can not be spilled in the using or carrying process, and the carrying is convenient.

The laser centering device 5 in this embodiment may be disposed on the top plate 32, or may be directly fixed to the measuring instrument 4 and located at the bottom of the measuring instrument 4.

Furthermore, in this embodiment, the suspension portion 71 is in a disc shape adapted to the shape of the cavity 61, a plurality of damping holes 71b are circumferentially spaced on the suspension portion 71, and the damping holes 71b are through holes penetrating through the upper and lower surfaces of the suspension portion 71, so that when the liquid in the cavity 61 is affected by an external force and shakes, the liquid in the cavity 61 can repeatedly pass through the through holes to play a role in consuming kinetic energy in the liquid, so that the suspension body 7 is made to stand as soon as possible, thereby improving the centering efficiency.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms foot rest 1, mounting 11, support foot 12, abdicating channel 8, translation mechanism 2, levelling mechanism 3, measuring instrument 4, laser centring device 5 etc. are used more extensively herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims (10)

1. A centering and leveling device for engineering measurement, which comprises a foot rest (1) with a mounting seat (11), a measuring instrument (4) arranged above the mounting seat (11) and a leveling mechanism (3) positioned between the measuring instrument (4) and the mounting seat (11), wherein the bottom of the measuring instrument (4) is provided with a laser centering device (5), the centering and leveling device is characterized in that a translation mechanism (2) capable of enabling the measuring instrument (4) to translate and lock along the transverse direction and the longitudinal direction is further arranged between the mounting seat (11) and the leveling mechanism (3), the laser centering device (5) comprises a base (6) and a suspension body (7), the base (6) is fixed relative to the measuring instrument (4), the base (6) is provided with a cavity (61), liquid is contained in the cavity (61), and the bottom of the suspension body (7) is provided with a laser emitter (72), the suspension body (7) is suspended in the cavity (61) so that the laser beam of the laser emitter (72) always faces vertically downwards.

2. The centering and leveling device for engineering measurement according to claim 1, wherein the cavity (61) of the base (6) is annular, the base (6) is provided with a yielding hole (62) along an axial line of the cavity (61), the suspension body (7) comprises an annular suspension portion (71) embedded in the cavity (61), the laser emitter (72) is cylindrical, the laser emitter (72) is located on the axial line of the suspension portion (71) and penetrates through the yielding hole (62), and the aperture of the yielding hole (62) is larger than the outer diameter of the laser emitter (72).

3. Centering and levelling device for engineering measurements according to claim 2, characterized in that the inner wall of the cavity (61) opposite to the outer circumference of the suspension (7) is curved.

4. Centering and leveling device for engineering measurements according to claim 2 or 3, characterized in that the hole diameter of the abdicating hole (62) increases in order from top to bottom.

5. Centering and leveling device for engineering measurements according to claim 1, characterized in that the base (6) is made of transparent material, and a cover (9) for closing the cavity (61) is further fixed on the base (6).

6. A centering and leveling device for engineering measurement according to claim 2, 3 or 5, wherein a first magnetic member (71a) arranged along the circumference of the suspension portion (71) is further fixedly arranged on the suspension body (7), a second magnetic member (63) arranged around the first magnetic member (71a) is also arranged on the base (6), and the magnetic poles of the adjacent sides of the first magnetic member (71a) and the second magnetic member (63) are the same.

7. Centering and levelling device for engineering measurements according to claim 6, characterized in that the first magnetic part (71a) is a permanent magnet and the second magnetic part (63) is a permanent magnet or an electromagnet.

8. The centering and leveling device for engineering measurement according to claim 6, wherein the laser emitter (72) comprises a housing (72a), a power supply (72b), a wireless communication module (72c), a control module (72d) and a laser emitting head (72e), the power supply (72b), the wireless communication module (72c) and the laser emitting head (72e) are all electrically connected with the control module (72d), and a switch for wireless signal connection with the wireless communication module (72c) is arranged on the measuring instrument (4) or the mounting seat (11).

9. The centering and leveling device for engineering measurement according to claim 8, wherein the translating mechanism (2) includes a bottom plate (21) fixedly connected to the mounting base (11), two first guide rails (23) extending in a transverse direction are spaced apart from each other on the bottom plate (21), a first sliding base (24) is slidably connected to each of the two first guide rails (23), two second guide rails (25) extending in a longitudinal direction are fixedly connected between the two first sliding bases (24), a second sliding base (26) is slidably connected to each of the second guide rails (25), and the leveling mechanism (3) is fixedly connected to each of the two second sliding bases (26).

10. Centering and leveling device for engineering measurements according to claim 9, characterized in that a first positioning bolt (27) capable of abutting against or separating from the first guide rail (23) is screwed on the first sliding seat (24), and a second positioning bolt (28) capable of abutting against or separating from the second guide rail (25) is screwed on the second sliding seat (26).

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