A surveying and mapping instrument positioning device

Abstract

The application provides a surveying and mapping instrument positioning device for engineering surveying and mapping, and relates to the technical field of engineering surveying and mapping equipment, which comprises a support seat and further comprises an expansion adjusting assembly, wherein the expansion adjusting assembly comprises a first driving motor mounted at the bottom of the support seat, in the application, the gear engages to drive two centrally symmetrical racks to move reversely, the moving seat is synchronously moved with the racks through sliding cooperation with the linear guide rails, flexible adjustment of the distance between the support rods is realized, the rotating seat can rotate around the support frame, the angle is adjusted through the arc-shaped guide rails, and the positioning is completed by tightening the first knob bolt after the rotating seat is in place, in the multistage telescopic assembly, the support rods, telescopic rods and fine adjustment rods can slide along the length direction, are stretched to a suitable height as required, and are locked and fixed through corresponding knob bolts, the support rods on the support seat and the rotating seat are matched, telescopic adjustment and angle adjustment are combined, quick and flexible adjustment of the support span, the angle and the height is realized, and stable placement of the surveying and mapping instrument under various terrains is ensured.

Description

Technical Field

[0001] This invention relates to the field of engineering surveying equipment technology, and in particular to a positioning device for a surveying instrument used in engineering surveying. Background Technology

[0002] In engineering surveying operations, the positioning accuracy of the surveying instrument is a core element to ensure the reliability of measurement data. In complex operating scenarios such as mountains and muddy foundation pits, not only is the transportation and erection efficiency low, but it is also easily affected by external factors such as wind and ground vibration, resulting in positioning deviation and calibration failure, which makes it difficult to meet the stringent requirements of modern engineering for high-precision, high-efficiency, and multi-functional surveying.

[0003] However, in practical use, the following shortcomings still exist: Firstly, existing engineering surveying instrument positioning devices cannot achieve rapid and flexible adjustment of support span, angle, and height to ensure stable placement of the surveying instrument in various terrains. Secondly, this severely reduces operational efficiency; complex terrain requires repeated manual adjustments of support position and height, which is time-consuming and labor-intensive, especially in batch surveying scenarios where it significantly slows down progress. Thirdly, it affects surveying accuracy; inaccurate adjustment of support span and angle can easily lead to device tilting, and height mismatch increases the difficulty of leveling, ultimately causing systematic errors in surveying data and misleading engineering decisions. Fourthly, it exacerbates equipment safety risks; when span and angle adjustments are limited and cannot adapt to terrain, the device lacks stability and is prone to tipping over due to vibration or minor collisions, causing damage to the surveying instrument. Finally, it narrows the applicable scope; it is difficult to stably place the instrument in complex terrains such as mountains and slopes, forcing the abandonment of some survey points or the adoption of temporary reinforcement measures, affecting the integrity of surveying coverage and the comprehensiveness of data.

[0004] Therefore, this invention proposes a positioning device for a surveying instrument used in engineering surveying to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a positioning device for a surveying instrument used in engineering surveying.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a positioning device for a surveying instrument used in engineering surveying, comprising a support base, and further comprising:

[0007] An extended adjustment assembly includes a first drive motor mounted on the bottom of a support base. The output end of the first drive motor is connected to a gear. Two racks are meshed symmetrically on the gear. One end of each rack is connected to a movable seat. A linear guide rail is provided on the bottom of the support base corresponding to the movable seat. The movable seat is slidably engaged with the linear guide rail. A support frame is connected to one side of the movable seat. A rotating seat is rotatably connected to the support frame. An arc-shaped guide rail is provided on the side of the movable seat near the rotating seat. The rotating seat is positioned and engaged with the arc-shaped guide rail by a first knob bolt.

[0008] A multi-stage telescopic assembly includes a support rod rotatably connected to a support base and a rotating base, a telescopic rod slidably connected inside the support rod along its length, a fine-tuning rod slidably connected inside the telescopic rod along its length, and a fixed base block connected to the bottom of the fine-tuning rod.

[0009] Furthermore, in the extended adjustment assembly, a second drive motor is installed inside the support frame, the output end of the second drive motor is connected to a first synchronous pulley, a synchronous belt is sleeved on the first synchronous pulley, and a second synchronous pulley is sleeved on the end of the synchronous belt away from the first synchronous pulley, and the second synchronous pulley is coaxially and fixedly connected to the rotating seat.

[0010] The beneficial effects of adopting the above-mentioned further solution are as follows: In the extended adjustment assembly, after the second drive motor starts, it drives the first synchronous pulley to rotate. The synchronous pulley transmits power through the synchronous belt, driving the second synchronous pulley to rotate synchronously. Since the second synchronous pulley is coaxially fixed with the rotating seat, it can drive the rotating seat to rotate around the support frame, thereby realizing angle adjustment and improving adjustment accuracy and efficiency.

[0011] Furthermore, a slider is integrally formed or detachably connected to the side of the movable seat near the linear guide rail. The slider is slidably embedded in the linear guide rail to achieve sliding engagement between the movable seat and the linear guide rail.

[0012] The beneficial effects of adopting the above-mentioned further solution are: the sliding engagement between the movable seat and the linear guide rail is achieved by a slider. The slider and the movable seat are integrally formed or detachably connected. The slider is slidably embedded in the linear guide rail to provide guiding constraints for the movable seat. When the rack drives the movable seat to move, the slider slides smoothly along the guide rail to avoid the movable seat from deviating and to ensure the stability and accuracy of the spacing adjustment.

[0013] Furthermore, in the multi-stage telescopic assembly, a second knob bolt is threaded through the bottom of the support rod, one end of which extends into the support rod and abuts against the telescopic rod. A third knob bolt is threaded through the bottom of the telescopic rod, one end of which extends into the telescopic rod and abuts against the fine-tuning rod.

[0014] The beneficial effects of adopting the above-mentioned further solution are as follows: the multi-stage telescopic assembly locks and fixes each rod segment through knob bolts. After the telescopic rod is stretched to the appropriate position, the second knob bolt at the bottom of the support rod is tightened, with one end extending into the rod to press against the telescopic rod, restricting the relative sliding between the two. After the fine-tuning rod is adjusted to the correct position, the third knob bolt at the bottom of the telescopic rod is tightened, and the fine-tuning rod is locked in the same way to ensure the stability of the overall telescopic structure.

[0015] Furthermore, a positioning and locking assembly is provided on the top of the support base. The positioning and locking assembly includes a fixing plate fixedly connected to the top of the support base. An adjusting screw is threadedly connected to the fixing plate. A mounting base is rotatably connected to the top of the adjusting screw. A fixing seat is fixedly connected to the mounting base.

[0016] The beneficial effects of adopting the above-mentioned further solution are: the height of the positioning and locking assembly is finely adjusted by the adjusting screw. When the adjusting screw is rotated, the mounting base connected to the top rotation can be raised and lowered because the screw is threaded to the fixing plate. The fixing base on the mounting base is used to support the surveying instrument. The height of the mounting base is precisely adjusted by adjusting the screw, and the mounting base is leveled in conjunction with the level.

[0017] Furthermore, a first limiting groove is provided in the fixed base, a clamping block is slidably connected in the first limiting groove, a second limiting groove is provided in the clamping block, a fourth knob bolt is threaded through the fixed base, one end of the fourth knob bolt extends into the second limiting groove and is fixedly connected to a cam, the cam abuts against the inner wall of the second limiting groove, and a magnetic block is embedded in the mounting base.

[0018] The beneficial effects of adopting the above-mentioned further solution are: rotating the fourth knob bolt drives the cam to rotate, the cam rotates in the second limiting groove of the clamping block and squeezes the groove wall, pushing the clamping block to slide along the first limiting groove of the fixed seat, the two clamping blocks work together to clamp the base of the surveying instrument, and at the same time the magnetic block on the mounting base attracts the base to assist in pre-fixing, so as to realize the rapid positioning and firm locking of the surveying instrument.

[0019] Furthermore, a buffer assembly is provided on the fine-tuning rod. The buffer assembly includes a support plate fixedly connected to the fine-tuning rod, a damper connected to the bottom of the support plate, and a spring sleeved on the outer side of the damper.

[0020] The beneficial effects of adopting the above-mentioned further solution are: the buffer assembly achieves buffering through the synergistic effect of the damper and the spring. When the fixed base block lands too quickly, the spring absorbs some of the energy first, and the damper suppresses the spring rebound. The damper is fixed to the support plate to ensure the stability of the buffer structure.

[0021] Furthermore, the bottom of the damper is connected to a connecting plate, the bottom of the connecting plate is connected to a universal ball, the universal ball is provided with a base plate, the base plate is provided with a ball groove adapted to the universal ball, and the universal ball is rotatably fitted into the ball groove.

[0022] The beneficial effects of adopting the above-mentioned further solution are: the bottom of the damper is connected to the universal ball through the connecting plate, and the universal ball is rotatably embedded in the matching ball groove of the base plate. This structure allows the base plate to rotate flexibly relative to the connecting plate. When the ground is uneven, the base plate can adaptively adjust its posture to ensure that its bottom surface maintains the maximum contact area with the ground.

[0023] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0024] 1. In this invention, when the support rod is extended and adjusted, the first drive motor drives the gear to rotate. The gear meshes and drives the two centrally symmetrical racks to move in opposite directions. The moving seat moves synchronously with the racks through sliding cooperation with the linear guide rail, realizing flexible adjustment of the support rod spacing. The rotating seat can rotate around the support frame and adjust the angle through the arc-shaped guide rail. After reaching the position, tighten the first knob bolt to complete the positioning. In the multi-stage telescopic assembly, the support rod, telescopic rod, and fine-tuning rod can slide along the length direction and be stretched to a suitable height as needed. They are then locked and fixed by the corresponding knob bolts. The support rods on the support seat and the rotating seat cooperate, and combined with telescopic adjustment and angle adjustment, the support span, angle, and height can be quickly and flexibly adjusted to ensure the stable placement of the surveying instrument in various terrains.

[0025] 2. In this invention, the core of the positioning and locking component is to achieve leveling and fine-tuning of the surveying instrument, rapid pre-fixing, and secure locking. The fixing plate provides a stable base for the component. When the adjusting screw is rotated, the screw and the fixing plate are threaded together, which can drive the top rotating mounting base to rise and fall. With the help of the level, the surveying instrument can be accurately leveled and adjusted. After the surveying instrument is placed on the mounting base, the magnetic block embedded on it quickly attracts the base to achieve pre-fixing and prevents displacement during the adjustment process. When locking, rotating the fourth knob bolt drives the cam to rotate. The cam presses against the groove wall in the second limiting groove of the clamping block, pushing the clamping block to slide along the first limiting groove of the fixing base. The two sets of clamping blocks work together to clamp the base of the surveying instrument. The overall structure combines mechanical transmission and magnetic attraction to balance adjustment accuracy and locking stability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a positioning device for an engineering surveying instrument according to the present invention;

[0027] Figure 2 This is a schematic diagram of the support rod structure of the positioning device for an engineering surveying instrument after adjustment, according to the present invention.

[0028] Figure 3This is a schematic diagram of the extended adjustment component structure of a positioning device for an engineering surveying instrument according to the present invention;

[0029] Figure 4 This is a schematic diagram of the extended adjustment structure of a positioning device for an engineering surveying instrument according to the present invention;

[0030] Figure 5 This is a schematic diagram of the rotation adjustment structure of a positioning device for an engineering surveying instrument according to the present invention;

[0031] Figure 6 This is a schematic diagram of the multi-stage telescopic group structure of a positioning device for an engineering surveying instrument according to the present invention;

[0032] Figure 7 This is a schematic diagram of the positioning and locking component structure of a positioning device for an engineering surveying instrument according to the present invention;

[0033] Figure 8 This is a structurally disassembled schematic diagram of the positioning and locking component of a positioning device for an engineering surveying instrument according to the present invention;

[0034] Figure 9 This is a schematic diagram of the buffer component structure of a positioning device for an engineering surveying instrument according to the present invention.

[0035] Figure label:

[0036] 1. Support base;

[0037] 2. Extended adjustment assembly; 21. First drive motor; 22. Gear; 23. Rack; 24. Moving seat; 25. Linear guide rail; 26. Slider; 27. Support frame; 28. Second drive motor; 29. ​​First synchronous pulley; 210. Synchronous belt; 211. Second synchronous pulley; 212. Rotating seat; 213. Arc-shaped guide rail; 214. First knob bolt;

[0038] 3. Multi-stage telescopic assembly; 31. Support rod; 32. Telescopic rod; 33. Second knob bolt; 34. Fine-tuning rod; 35. Third knob bolt; 36. Fixed base block;

[0039] 4. Positioning and locking assembly; 41. Fixing plate; 42. Adjusting screw; 43. Mounting base; 44. Fixing base; 45. First limiting groove; 46. Clamping block; 47. Fourth knob bolt; 48. Second limiting groove; 49. Cam; 410. Magnetic block;

[0040] 5. Buffer assembly; 51. Support plate; 52. Damper; 53. Spring; 54. Connecting plate; 55. Universal ball; 56. Base plate; 57. Ball groove. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1-6 As shown, this embodiment provides a technical solution: a positioning device for an engineering surveying instrument, including a support base 1, and further comprising:

[0043] The extended adjustment assembly 2 includes a first drive motor 21 installed at the bottom of the support base 1. The output end of the first drive motor 21 is connected to a gear 22. Two racks 23 are meshed symmetrically on the gear 22. One end of each rack 23 is connected to a movable seat 24. A linear guide rail 25 is provided at the bottom of the support base 1 corresponding to the movable seat 24. The movable seat 24 and the linear guide rail 25 are slidably engaged. A support frame 27 is connected to one side of the movable seat 24. A rotating seat 212 is rotatably connected to the support frame 27. An arc-shaped guide rail 213 is provided on the side of the movable seat 24 near the rotating seat 212. The rotating seat 212 is positioned and engaged with the arc-shaped guide rail 213 by a first knob bolt 214.

[0044] The multi-stage telescopic assembly 3 includes a support rod 31 rotatably connected to the support base 1 and the rotating base 212, respectively. A telescopic rod 32 is slidably connected within the support rod 31 along its length. A fine-tuning rod 34 is slidably connected within the telescopic rod 32 along its length. A fixed base block 36 is connected to the bottom of the fine-tuning rod 34. When the support rod 31 is extended and adjusted, the first drive motor 21 drives the gear 22 to rotate. The gear 22 meshes and drives two centrally symmetrical racks 23 to move in opposite directions. The moving base 24 moves synchronously with the racks 23 through sliding engagement with the linear guide rail 25, realizing the extension of the support rod. The spacing of 31 is flexibly adjustable. The rotating seat 212 can rotate around the support frame 27. The angle is adjusted by the arc guide rail 213. After it is in place, the first knob bolt 214 is tightened to complete the positioning. In the multi-stage telescopic assembly 3, the support rod 31, telescopic rod 32, and fine-tuning rod 34 can slide along the length direction and be stretched to a suitable height as needed. They are then locked and fixed by the corresponding knob bolts. The support rod 31 on the support seat 1 and the rotating seat 212 cooperate with each other. Combined with telescopic adjustment and angle adjustment, the support span, angle and height can be quickly and flexibly adjusted to ensure the stable placement of the surveying instrument in various terrains.

[0045] like Figures 1-5As shown, in the extended adjustment assembly 2, a second drive motor 28 is installed inside the support frame 27. The output end of the second drive motor 28 is connected to a first synchronous pulley 29. A synchronous belt 210 is fitted onto the first synchronous pulley 29. A second synchronous pulley 211 is fitted onto the end of the synchronous belt 210 away from the first synchronous pulley 29. The second synchronous pulley 211 is coaxially and fixedly connected to the rotating seat 212. In the extended adjustment assembly 2, after the second drive motor 28 starts, it drives the first synchronous pulley 29 to rotate. The synchronous pulley transmits power through the synchronous belt 210, driving the second synchronous pulley 211 to rotate synchronously. Because the second synchronous pulley 211 is coaxially and fixedly connected to the rotating seat 212, it can drive the rotating seat 212 to rotate around the support frame 27. 7. Rotation enables angle adjustment, improving adjustment accuracy and efficiency. A slider 26 is integrally formed or detachably connected to the side of the movable seat 24 near the linear guide rail 25. The slider 26 is slidably embedded in the linear guide rail 25, realizing the sliding engagement between the movable seat 24 and the linear guide rail 25. The sliding engagement between the movable seat 24 and the linear guide rail 25 is achieved through the slider 26. The slider 26 and the movable seat 24 are integrally formed or detachably connected. The slider 26 is slidably embedded in the linear guide rail 25, providing guiding constraints for the movable seat 24. When the rack 23 drives the movable seat 24 to move, the slider 26 slides smoothly along the guide rail, preventing the movable seat 24 from deviating and ensuring the stability and accuracy of the spacing adjustment.

[0046] like Figures 1-2 as well as Figure 6 As shown, in the multi-stage telescopic assembly 3, the bottom of the support rod 31 is threaded with a second knob bolt 33, one end of which extends into the support rod 31 and abuts against the telescopic rod 32. The bottom of the telescopic rod 32 is threaded with a third knob bolt 35, one end of which extends into the telescopic rod 32 and abuts against the fine-tuning rod 34. The multi-stage telescopic assembly 3 locks and fixes each rod segment through the knob bolts. After the telescopic rod 32 is stretched to the appropriate position, the second knob bolt 33 at the bottom of the support rod 31 is tightened, with one end extending into the rod and abutting against the telescopic rod 32 to restrict the relative sliding between the two. After the fine-tuning rod 34 is adjusted to the appropriate position, the third knob bolt 35 at the bottom of the telescopic rod 32 is tightened, and the fine-tuning rod 34 is locked in the same way to ensure the stability of the overall telescopic structure.

[0047] like Figures 1-2 as well as Figures 7-8As shown, a positioning and locking assembly 4 is provided on the top of the support base 1. The positioning and locking assembly 4 includes a fixed plate 41 fixedly connected to the top of the support base 1. An adjusting screw 42 is threadedly connected to the fixed plate 41. A mounting base 43 is rotatably connected to the top of the adjusting screw 42. A fixed base 44 is fixedly connected to the mounting base 43. The height of the positioning and locking assembly 4 is finely adjusted by the adjusting screw 42. When the adjusting screw 42 is rotated, because the screw is threadedly connected to the fixed plate 41, it can drive the mounting base 43 rotatably connected to the top to rise or fall. The fixed base 44 on the mounting base 43 is used to support the surveying instrument. The height of the mounting base 43 is precisely adjusted by adjusting the adjusting screw 42. The mounting base 43 is leveled with a level. A first limiting groove 45 is provided in the fixed base 44. A clamping block 46 is slidably connected in a limiting groove 45. A second limiting groove 48 is opened in the clamping block 46. A fourth knob bolt 47 is threaded through the fixing seat 44. One end of the fourth knob bolt 47 extends into the second limiting groove 48 and is fixedly connected to a cam 49. The cam 49 abuts against the inner wall of the second limiting groove 48. A magnet 410 is embedded in the mounting seat 43. Rotating the fourth knob bolt 47 drives the cam 49 to rotate. The cam 49 rotates in the second limiting groove 48 of the clamping block 46 and squeezes the groove wall, pushing the clamping block 46 to slide along the first limiting groove 45 of the fixing seat 44. The two clamping blocks 46 work together to clamp the base of the surveying instrument. At the same time, the magnet 410 on the mounting seat 43 attracts the base to assist in pre-fixing, realizing the rapid positioning and firm locking of the surveying instrument.

[0048] like Figures 1-2 , Figure 6 as well as Figure 9 As shown, a buffer assembly 5 is provided on the fine-tuning rod 34. The buffer assembly 5 includes a support plate 51 fixedly connected to the fine-tuning rod 34. A damper 52 is connected to the bottom of the support plate 51, and a spring 53 is sleeved on the outside of the damper 52. The buffer assembly 5 achieves buffering through the synergistic action of the damper 52 and the spring 53. When the fixed base block 36 lands too quickly, the spring 53 first absorbs some of the energy, and the damper 52 then suppresses the spring 53 from rebounding. The damper 52 is fixed to the support plate 51 to ensure the stability of the buffer structure. The bottom of the damper 52 is connected to a connecting... The connecting plate 54 has a universal ball 55 connected to its bottom. A base plate 56 is provided on the universal ball 55. A ball groove 57 adapted to the universal ball 55 is provided on the base plate 56. The universal ball 55 is rotatably fitted into the ball groove 57. The bottom of the damper 52 is connected to the universal ball 55 through the connecting plate 54. The universal ball 55 is rotatably fitted into the matching ball groove 57 of the base plate 56. This structure allows the base plate 56 to rotate flexibly relative to the connecting plate 54. When the ground is uneven, the base plate 56 can adaptively adjust its posture to ensure that its bottom surface maintains the maximum contact area with the ground.

[0049] Working principle:

[0050] like Figures 1-9As shown, when the span of the positioning device of the surveying instrument is adjusted, the first drive motor 21 in the extended adjustment component 2 starts, driving the gear 22 to rotate. The gear 22 meshes and drives the two centrally symmetrical racks 23 to move in opposite directions. The moving seat 24 moves smoothly and synchronously with the racks 23 through the sliding cooperation of the bottom slider 26 and the linear guide rail 25. This drives the two side support frames 27 and the multi-stage telescopic component 3 to move synchronously, quickly adjusting the distance between the two side support rods 31 to adapt to the support requirements of different terrains. The angle adjustment adopts a combination of motor drive and mechanical positioning. After the second drive motor 28 starts, it transmits power through the first synchronous pulley 29, the synchronous belt 210 and the second synchronous pulley 211, driving the rotating seat 212, which is coaxially fixed with the second synchronous pulley 211, to rotate around the support frame 27. During the rotation, the arc-shaped guide rail 213 provides guidance for the rotating seat 212 to ensure accurate angle adjustment. After the adjustment is in place, tightening the first knob bolt 214 completes the positioning, greatly improving the adjustment efficiency and stability. In the multi-stage telescopic assembly 3, the support rod 31, telescopic rod 32, and fine-tuning rod 34 can slide and stretch along the length direction. After stretching to the target height, the second knob bolt 33 and the third knob bolt 35 are tightened respectively. The relative sliding of each rod segment is restricted by the bolt clamping method, so as to achieve a firm fixation at different heights. At the same time, the adjusting screw 42 on the top of the support base 1 can precisely fine-tune the height of the mounting base 43. With the help of the level, the leveling is completed to ensure that the surveying instrument is placed horizontally. When the surveying instrument is fixed, the fourth knob bolt 47 is rotated to drive the cam 49 to rotate. The cam 49 presses the wall of the second limiting groove 48 of the clamping block 46 and pushes the clamping block 46 to slide along the first limiting groove 45 to clamp the base of the surveying instrument. The magnetic block 410 on the mounting base 43 simultaneously adsorbs the base to complete the pre-fixation. The double guarantee of the fixation is firm. In the bottom buffer assembly 5, the damper 52 and the spring 53 work together to absorb the impact of landing. The universal ball 55 and the ball groove 57 work together to make the base plate 56 adapt to the ground slope, so as to ensure the overall stability of the device in complex terrain.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A positioning device for a surveying instrument used in engineering surveying, comprising a support base (1), characterized in that, Also includes: An extended adjustment assembly (2) includes a first drive motor (21) installed at the bottom of a support base (1). The output end of the first drive motor (21) is connected to a gear (22). Two racks (23) are meshed symmetrically on the gear (22). One end of each rack (23) is connected to a movable seat (24). A linear guide rail (25) is provided at the bottom of the support base (1) corresponding to the movable seat (24). The movable seat (24) is slidably engaged with the linear guide rail (25). A support frame (27) is connected to one side of the movable seat (24). A rotating seat (212) is rotatably connected to the support frame (27). An arc-shaped guide rail (213) is provided on the side of the movable seat (24) near the rotating seat (212). The rotating seat (212) is positioned and engaged with the arc-shaped guide rail (213) by a first knob bolt (214). A multi-stage telescopic assembly (3) includes a support rod (31) rotatably connected to a support base (1) and a rotating base (212), a telescopic rod (32) slidably connected inside the support rod (31) along its length direction, a fine-tuning rod (34) slidably connected inside the telescopic rod (32) along its length direction, and a fixed base block (36) connected to the bottom of the fine-tuning rod (34).

2. The positioning device for an engineering surveying instrument according to claim 1, characterized in that: In the extended adjustment assembly (2), a second drive motor (28) is installed in the support frame (27). The output end of the second drive motor (28) is connected to a first synchronous pulley (29). A synchronous belt (210) is sleeved on the first synchronous pulley (29). A second synchronous pulley (211) is sleeved on the end of the synchronous belt (210) away from the first synchronous pulley (29). The second synchronous pulley (211) is coaxially fixedly connected to the rotating seat (212).

3. The positioning device for an engineering surveying instrument according to claim 1, characterized in that: The movable seat (24) has a slider (26) integrally formed or detachably connected on one side near the linear guide rail (25). The slider (26) is slidably embedded in the linear guide rail (25) to realize the sliding cooperation between the movable seat (24) and the linear guide rail (25).

4. The positioning device for an engineering surveying instrument according to claim 1, characterized in that: In the multi-stage telescopic assembly (3), the bottom of the support rod (31) is threaded with a second knob bolt (33), one end of the second knob bolt (33) extends into the support rod (31) and abuts against the telescopic rod (32), and the bottom of the telescopic rod (32) is threaded with a third knob bolt (35), one end of the third knob bolt (35) extends into the telescopic rod (32) and abuts against the fine-tuning rod (34).

5. The positioning device for an engineering surveying instrument according to claim 1, characterized in that: The top of the support base (1) is provided with a positioning and locking assembly (4). The positioning and locking assembly (4) includes a fixing plate (41) fixedly connected to the top of the support base (1). An adjusting screw (42) is threadedly connected to the fixing plate (41). A mounting seat (43) is rotatably connected to the top of the adjusting screw (42). A fixing seat (44) is fixedly connected to the mounting seat (43).

6. The positioning device for an engineering surveying instrument according to claim 5, characterized in that: The fixed base (44) has a first limiting groove (45) and a clamping block (46) is slidably connected in the first limiting groove (45). The clamping block (46) has a second limiting groove (48). A fourth knob bolt (47) is threaded through the fixed base (44). One end of the fourth knob bolt (47) extends into the second limiting groove (48) and is fixedly connected to a cam (49). The cam (49) abuts against the inner wall of the second limiting groove (48). A magnetic block (410) is embedded in the mounting base (43).

7. The positioning device for an engineering surveying instrument according to claim 1, characterized in that: A buffer assembly (5) is provided on the fine adjustment rod (34). The buffer assembly (5) includes a support plate (51) fixedly connected to the fine adjustment rod (34). A damper (52) is connected to the bottom of the support plate (51). A spring (53) is sleeved on the outside of the damper (52).

8. The positioning device for an engineering surveying instrument according to claim 7, characterized in that: The bottom of the damper (52) is connected to a connecting plate (54), and the bottom of the connecting plate (54) is connected to a universal ball (55). The universal ball (55) is provided with a base plate (56), and the base plate (56) is provided with a ball groove (57) adapted to the universal ball (55). The universal ball (55) is rotatably embedded in the ball groove (57).

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