Adjustable positioning equipment for land surveying and mapping

Abstract

The invention discloses adjustable positioning equipment for land surveying and mapping, and relates to the technical field of adjustable positioning supports, the adjustable positioning equipment comprises a mounting seat and a supporting rod, the supporting rod is movably hinged to the side edge of the mounting seat, an adjusting assembly is vertically arranged below the mounting seat, a connecting plate is hinged to the side edge of the adjusting assembly, and a bottom plate is slidably connected to the upper end of the connecting plate; when the connecting plate and the supporting rod are opened, the lower end of the supporting rod slides above the connecting plate through the bottom plate, when the connecting plate is horizontally aligned with the side edge of the fixing base, the rotating disc can be driven to rotate forwards, and the rotating disc rotates along with rotation of the rotating disc. The transmission arm can push the limiting plate to extend outwards through the through groove to be inserted into one end of the connecting plate to be limited and fixed, the connecting plate is kept in a transverse horizontal state, at the moment, the bottom plate drives the lower ends of the supporting rods to be fixed to the side, away from the fixing base, of the connecting plate, the three supporting rods are obliquely unfolded together to form a tripod for supporting, and stability is improved.

Description

Technical Field

[0001] This invention relates to the field of adjustable positioning bracket technology, specifically an adjustable positioning device for land surveying. Background Technology

[0002] Land surveying, as a fundamental task for acquiring geospatial information, has seen its accuracy and efficiency become key factors affecting project quality and the scientific nature of planning. Traditional land surveying operations typically rely on high-precision instruments such as total stations, GNSS receivers, and levels. However, these devices generally suffer from problems in actual field operations, including unstable positioning support, limited adjustment methods, and poor terrain adaptability. Especially in complex terrain environments, such as hilly areas, soft soil, sandy areas, or areas with exposed rock, traditional tripods often struggle to achieve rapid leveling and stable positioning, leading to increased measurement errors, reduced work efficiency, and even the need for multiple rework sessions, severely impacting the surveying cycle and data reliability.

[0003] Currently, most surveying support structures on the market are fixed tripod supports, with the leg length adjusted manually by pulling or rotating a screw thread. While this can adapt to different ground height differences to some extent, the adjustment process is cumbersome and lacks an effective synchronous limiting mechanism, making it prone to leg retraction or loosening, thus posing a risk of equipment tipping over. Furthermore, existing supports typically require changing different foot pads or ground stakes when dealing with hard surfaces (such as cement and asphalt) and soft surfaces (such as mud and grass), which is inconvenient and cannot be quickly switched according to ground conditions, reducing the equipment's versatility and portability.

[0004] Therefore, we have launched an adjustable positioning device for land surveying. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable positioning device for land surveying, thereby solving the problems mentioned in the background above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an adjustable positioning device for land surveying, comprising a mounting base and a support rod, wherein the support rod is movably hinged to the side of the mounting base, an adjustment component is vertically arranged below the mounting base, a connecting plate is hinged to the side of the adjustment component, a base plate is slidably connected to the upper end of the connecting plate, and a support component is installed at the end of the connecting plate away from the adjustment component; The adjustment assembly includes a fixed base and a turntable installed in the middle of the inner cavity of the fixed base. A transmission arm is hinged at a distance from the upper end of the turntable. A limit plate is hinged to the end of the transmission arm away from the turntable. A toothed plate is provided on one side of the turntable.

[0007] Based on the above features: when it is necessary to open the support rod to support the surveying equipment above the mounting base, the connecting plate and the support rod can be opened. After the connecting plate is fixed in a horizontal state, the base plate will drive the lower end of the support rod to be fixed on the side of the connecting plate away from the adjustment component. At this time, the three support rods will be tilted and unfolded together to form a tripod for support.

[0008] Furthermore, a sleeve is fixedly connected to the lower end of the support rod, and a support leg is movably inserted into the lower end of the sleeve. A threaded hole is opened on one side of the lower end of the sleeve, and a locking screw is threaded into the inner side of the threaded hole.

[0009] Based on the above features, the length of the support rod and legs can be adjusted and fixed by locking screws, which facilitates height adjustment and storage.

[0010] Furthermore, a protruding plate is fixedly welded to the side of the fixed seat, and a through groove is opened on the side surface of the fixed seat. The through groove is located in the middle of the protruding plate. An adjustment groove is opened on one side surface of the fixed seat, and a slide rail is symmetrically installed on the bottom surface of the side of the fixed seat cavity near the adjustment groove.

[0011] Based on the above features: it is used for the installation and sliding guidance of the limiting plate and toothed plate to achieve coordinated movement within the structure.

[0012] Furthermore, a gear is connected to the lower end of the turntable, and a rotating shaft is connected between the turntable and the gear. An adjustment knob is installed on the upper end of the rotating shaft, and the adjustment knob is located in the middle of the upper end of the fixed base.

[0013] Based on the above features, a manual adjustment mechanism is constructed to control the transmission arm to push the limit plate to extend or retract.

[0014] Furthermore, a buffer spring is installed on the side of the toothed plate away from the turntable, and sliding plates are symmetrically installed on the lower end of the toothed plate.

[0015] Based on the above characteristics: the slide plate is used to slide in conjunction with the slide rail to achieve smooth movement and reset of the toothed plate, thereby enhancing the stability and durability of the adjustment process.

[0016] Furthermore, the connecting plate has a guide groove in the middle, and grooves are symmetrically formed on the inner walls of both sides of the guide groove. The guide groove and the grooves form a cross structure, and a slot is formed in the middle of the side of the connecting plate near the fixing seat.

[0017] Based on the above features: the slot is used for inserting and fixing the limiting plate to achieve horizontal locking of the base plate.

[0018] Furthermore, a lug is fixedly installed on the upper end of the base plate, and a guide slider is fixedly installed on the lower end of the base plate near the fixed seat. A connecting hole is opened between the base plate and the guide slider, and an adjusting screw is threaded inside the connecting hole. A movable hole is symmetrically opened on both sides of the guide slider, and a ball is movably arranged inside the movable hole.

[0019] Based on the above features: the guide slider has movable holes and ball bearings on both sides, which, together with the adjusting screw, realize the switching between sliding and locking functions.

[0020] Furthermore, the support assembly includes a fixed cylinder and vertical grooves symmetrically opened on both sides of the fixed cylinder. A piston seat is movably connected to the inner cavity of the fixed cylinder, a spiral cone is fixedly connected to the bottom of the piston seat, and pressure plates are symmetrically installed on both sides of the piston seat.

[0021] Based on the above features: the spiral ground cone can be moved up and down by stepping on the pressure plate, realizing a quick switching support mode between hard and soft ground.

[0022] Furthermore, a through hole is provided at the bottom of the fixed cylinder, the diameter of which is larger than that of the spiral cone, and the diameter of the piston seat is larger than that of the through hole.

[0023] Based on the above features: to prevent the piston seat from coming out and to ensure that the spiral cone does not detach from the fixed cylinder during the extension and retraction process.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves precise positioning and stable support for surveying instruments by setting up support rods, adjusting components, connecting plates, and base plates. When the connecting plate and support rods are opened, the lower end of the support rods will slide above the connecting plate through the base plate. When the connecting plate is horizontally aligned with the side of the fixed seat, the turntable can be driven to rotate forward. As the turntable rotates, the transmission arm can push the limiting plate to extend outward through the through slot and insert into one end of the connecting plate for limiting and fixing, so that the connecting plate is kept in a horizontally horizontal state. When the connecting plate is unfolded to a horizontally horizontal state, the lower end of the support rods will slide through the base plate. After the connecting plate is fixed in a horizontally horizontal state, the base plate will drive the lower end of the support rods to be fixed on the side of the connecting plate away from the fixed seat. At this time, the three support rods will unfold together in an inclined shape to form a tripod for support, improving stability.

[0025] 2. The connecting plate and the base plate are connected by a guide groove and a guide slider. When the base plate needs to be moved, the adjusting screw can be reversed to move upward, so that the tapered surface at the lower end of the adjusting screw separates from the ball bearing. At this time, there is a gap between the two. When the base plate is moved, the ball bearing can roll inside the groove. When the base plate needs to be fixed, the adjusting screw can be turned clockwise, so that the tapered surface at the lower end of the adjusting screw presses against the surface of the ball bearing, so that the ball bearing cannot rotate and move. At this time, the base plate will also be stuck and cannot move on its own, which further enhances the stability of the equipment after adjustment and prevents deviation due to external interference.

[0026] 3. The spiral ground cone in the support assembly can be quickly extended and retracted through the piston seat, adapting to both hard and soft terrains. On hard surfaces such as cement and asphalt, the spiral ground cone can be completely retracted and directly supported by the fixed cylinder, avoiding wear on the ground cone. On soft surfaces such as sand and mud, the ground cone can be quickly inserted into the ground, enhancing grip and preventing the equipment from tipping over. This design not only improves the adaptability of the equipment but also reduces on-site debugging time, significantly improving the overall efficiency of surveying operations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an adjustable positioning device for land surveying according to the present invention; Figure 2 This is a schematic diagram of the adjustment components, connecting plate, and base plate structure of an adjustable positioning device for land surveying according to the present invention. Figure 3 This is a partial cross-sectional view of the support rod of an adjustable positioning device for land surveying according to the present invention; Figure 4 This is a top view of the internal adjustment component of an adjustable positioning device for land surveying according to the present invention; Figure 5 This is a diagram showing the rotation state of the turntable, transmission arm, and limiting plate of an adjustable positioning device for land surveying according to the present invention. Figure 6 This is a schematic diagram of the connecting plate structure of an adjustable positioning device for land surveying according to the present invention; Figure 7 This is an internal side view of the connecting plate and the base plate of an adjustable positioning device for land surveying according to the present invention; Figure 8 This is a diagram showing the extended state of a spiral ground cone in an adjustable positioning device for land surveying according to the present invention. Figure 9 This is a diagram showing the retraction state of a spiral ground cone in an adjustable positioning device for land surveying according to the present invention.

[0028] In the diagram: 1. Mounting base; 2. Support rod; 21. Sleeve; 22. Support leg; 23. Threaded hole; 24. Locking screw; 3. Adjusting assembly; 31. Fixed base; 311. Protruding plate; 312. Through groove; 313. Adjusting groove; 314. Slide rail; 32. Turntable; 321. Gear; 322. Rotating shaft; 323. Adjusting knob; 33. Transmission arm; 34. Limiting plate; 35. Toothed plate; 351. Buffer spring; 352. Slide plate; 4. Connecting plate; 41. Guide groove; 42. Groove; 43. Slot; 5. Base plate; 51. Lug; 52. Guide slider; 53. Connecting hole; 54. Adjusting screw; 55. Movable hole; 56. Ball bearing; 6. Support assembly; 61. Fixed cylinder; 611. Through hole; 62. Vertical groove; 63. Piston seat; 64. Spiral ground cone; 65. Pressure plate. Detailed Implementation

[0029] 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. Example

[0030] Please see Figure 1-6 An adjustable positioning device for land surveying includes a mounting base 1 and support rods 2. The surveying device is mounted on the mounting base 1 using bolt fixing, a prior art method, which will not be described in detail. The support rods 2 are configured in three sets to form a triangular bracket. The support rods 2 are movably hinged to the side of the mounting base 1 via hinge shafts. An adjustment assembly 3 is vertically arranged below the mounting base 1. A connecting plate 4 is hinged to the side of the adjustment assembly 3. A base plate 5 is slidably connected to the upper end of the connecting plate 4. The bottom of the support rods 2 is hinged above the base plate 5. The base plate 5, connecting plate 4, and support rods 2 are all configured in three sets. When it is necessary to open the support rods 2 to adjust the surveying device above the mounting base 1... When preparing the support, the connecting plate 4 and the support rod 2 can be opened. After the connecting plate 4 is fixed in a horizontal position, the base plate 5 will drive the lower end of the support rod 2 to be fixed on the side of the connecting plate 4 away from the adjustment component 3. At this time, the three support rods 2 will be tilted together to form a tripod for support. When the ground is uneven and one of the support rods 2 needs to be adjusted individually, the fixing effect of the base plate 5 can be released. Then push one of the support rods 2 to make the base plate 5 slide above the connecting plate 4 until the entire equipment is level and accurate (this can be done by observing the circular level or electronic level on the surveying equipment; the existing technology will not be elaborated).

[0031] Adjustment assembly 3 includes a fixed base 31 and a turntable 32 installed in the middle of the inner cavity of the fixed base 31. A protruding plate 311 is fixedly welded to the side of the fixed base 31. One end of the connecting plate 4 is movably hinged to the protruding plate 311. A through groove 312 is opened on the side surface of the fixed base 31. The through groove 312 is arranged in a circular array and consists of three grooves. The through groove 312 is located in the middle of the protruding plate 311. A transmission arm 33 is hinged at intervals on the upper end of the turntable 32. The transmission arms 33 are arranged in a circular array on the turntable 32. The transmission arms 33 are far from the center of the turntable 32. One end of the turntable 32 is hinged to a limiting plate 34, which can be moved through the through slot 312. A toothed plate 35 is provided on one side of the turntable 32. When the connecting plate 4 is unfolded and horizontally aligned with the side of the fixed seat 31, the toothed plate 35 can be moved away from the turntable 32, and then the turntable 32 is driven to rotate forward. As the turntable 32 rotates, the transmission arm 33 can push the limiting plate 34 to extend outward through the through slot 312 and insert into one end of the connecting plate 4 for limiting and fixing, so that the connecting plate 4 is kept in a horizontal state. Example

[0032] Please see Figure 1 and Figure 3 An adjustable positioning device for land surveying includes a sleeve 21 fixedly connected to the lower end of a support rod 2. The sleeve 21 has a diameter larger than that of the support rod 2. A support leg 22 is movably inserted into the lower end of the sleeve 21. A through hole is provided at the lower end of the sleeve 21, through which the upper end of the support leg 22 is inserted into the interior of the sleeve 21. A threaded hole 23 is provided at the lower end of one side of the sleeve 21, and a locking screw 24 is threaded inside the threaded hole 23. When it is necessary to adjust the tilt angle of one of the support rods 2 individually or to adjust the length of the entire support rod 2, the locking screw 24 can be unscrewed to allow the support leg 22 to extend and retract. After adjustment, the locking screw 24 is tightened to limit and fix the support leg 22, preventing it from extending and retracting on its own. Example

[0033] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5An adjustable positioning device for land surveying includes a turntable 32 with a gear 321 connected to its lower end. The diameter of the gear 321 is larger than that of the turntable 32. A rotating shaft 322 connects the turntable 32 and the gear 321. An adjustment knob 323 is mounted on the upper end of the rotating shaft 322 and is located in the middle of the upper end of a fixed base 31. When the adjustment knob 323 is rotated, the turntable 32 and the gear 321 can be rotated synchronously through the rotating shaft 322. A toothed plate 35 is located on one side of the turntable 32 and the gear 321, and the teeth of the toothed plate 35 match the tooth grooves of the gear 321. An adjustment groove 313 is provided on one side surface of the fixed base 31. The adjustment groove 313 is in a horizontal position to facilitate adjustment. The toothed plate 35 moves left and right. A buffer spring 351 is installed on the side of the toothed plate 35 away from the turntable 32. When the toothed plate 35 is pulled away from the turntable 32 and the gear 321, the buffer spring 351 will be squeezed and deformed. When the toothed plate 35 is released, the buffer spring 351 will restore its elastic potential energy and rebound the toothed plate 35, so that the toothed plate 35 and the gear 321 are engaged together, while the toothed plate 35 does not contact the turntable 32, leaving a certain gap between them. A slide rail 314 is symmetrically installed on the bottom side of the inner cavity of the fixed base 31 near the adjustment groove 313. A sliding plate 352 is symmetrically installed on the lower end of the toothed plate 35. The sliding plate 352 is slidably connected to the slide rail 314 to facilitate the parallel displacement of the toothed plate 35. Example

[0034] Please see Figure 1 , Figure 2 , Figure 6 and Figure 7 An adjustable positioning device for land surveying has a guide groove 41 in the middle of a connecting plate 4, and grooves 42 symmetrically formed on the inner walls of both sides of the guide groove 41. The guide groove 41 and the grooves 42 form a cross structure. The base plate 5 is guided and slid through the guide groove 41 and the grooves 42, so that when the base plate 5 moves the lower end of the support rod 2 above the connecting plate 4, the base plate 5 will not separate from the connecting plate 4. A slot 43 is formed in the middle of the side of the connecting plate 4 near the fixed seat 31. The slot 43 has the same diameter as the through groove 312, so that when the limiting plate 34 extends outward through the through groove 312, it can be inserted into the slot 43 to limit and fix the limiting plate 34, so that the limiting plate 34 is kept in a horizontal state. Example

[0035] Please see Figure 1 , Figure 2 , Figure 6 and Figure 7An adjustable positioning device for land surveying includes a base plate 5 with a lug 51 fixedly installed on its upper end. The lower end of a support leg 22 is hinged to the lug 51, allowing the entire support rod 2 to move when the base plate 5 is displaced. A guide slider 52 is fixedly installed on the lower end of the base plate 5 near the fixed seat 31. The base plate 5 is slidably connected to a guide groove 41 via the guide slider 52. A connecting hole 53 is provided between the base plate 5 and the guide slider 52. The connecting hole 53 is a threaded hole, and an adjusting screw 54 is threadedly connected inside the connecting hole 53. When the adjusting screw 54 rotates clockwise, it moves towards the lower end of the inner cavity of the connecting hole 53. When the adjusting screw 54 rotates counterclockwise, it gradually rotates upwards. The bottom of the adjusting screw 54 is equipped with... The guide slider 52 has a tapered surface and symmetrical movable holes 55 on both sides. A ball bearing 56 is movably disposed inside the movable hole 55. Half of the ball bearing 56 is located inside the guide slider 52, and the other half is located inside the groove 42. When the base plate 5 needs to be moved, the adjusting screw 54 can be reversed to move upward, so that the tapered surface at the lower end of the adjusting screw 54 separates from the ball bearing 56. At this time, there is a gap between the two. When the base plate 5 is moved, the ball bearing 56 can roll inside the groove 42. When the base plate 5 needs to be fixed, the adjusting screw 54 can be rotated forward, so that the tapered surface at the lower end of the adjusting screw 54 presses against the surface of the ball bearing 56, so that the ball bearing 56 cannot rotate or move. At this time, the base plate 5 will also be stuck and unable to move on its own. Example

[0036] Please see Figure 1 , Figure 2 , Figure 8 and Figure 9 An adjustable positioning device for land surveying is provided. A support component 6 is installed at the end of the connecting plate 4 away from the adjustment component 3. The support component 6 includes a fixed cylinder 61 and vertical grooves 62 symmetrically opened on both sides of the fixed cylinder 61. The fixed cylinder 61 is a hollow cylindrical structure. A piston seat 63 is movably connected to the inner cavity of the fixed cylinder 61. A spiral ground cone 64 (which can also be replaced by any ground cone that can be inserted into the ground in the prior art) is fixedly connected to the bottom of the piston seat 63. Pressure plates 65 are symmetrically installed on both sides of the piston seat 63. The pressure plates 65 extend through the vertical grooves 62 and can be guided and limited. A through hole 611 is opened at the bottom of the fixed cylinder 61. The diameter of the through hole 611 is larger than that of the spiral ground cone 64. The diameter of the piston seat 63 is larger than that of the through hole 611, so that the piston seat 63 can only be located in the inner cavity of the fixed cylinder 61. This facilitates the extension and retraction adjustment of the spiral ground cone 64 while preventing the spiral ground cone 64 and the piston seat 63 from separating from the fixed cylinder 61.

[0037] When the ground being surveyed is flat and hard (such as cement ground, asphalt road, asphalt, wooden floor, etc.), the pressure plate 65 can be pulled upward. At this time, the pressure plate 65 can drive the spiral cone 64 to move upward and retract into the inner cavity of the fixed cylinder 61 through the piston seat 63. Finally, the fixed cylinder 61 can be used to support it on the ground. When the ground being surveyed is a soft, insertable terrain (such as sand, mud, or grassland), when the fixing cylinder 61 is supported on the ground, the pressure plate 65 can be pressed down by stepping on it, causing the pressure plate 65 to drive the spiral ground cone 64 to press down and be inserted into the ground for fixation via the piston seat 63.

[0038] Working principle: First, when it is necessary to open the support rod 2 to support the surveying equipment above the mounting base 1, the connecting plate 4 and the support rod 2 can be opened. When the connecting plate 4 is horizontally aligned with the side of the fixed base 31, the toothed plate 35 can be moved away from the turntable 32 and gear 321. Then, the turntable 32 is driven to rotate forward. As the turntable 32 rotates, the transmission arm 33 can push the limiting plate 34 to extend outward through the through slot 312 and insert into one end of the connecting plate 4 for limiting and fixing, so that the connecting plate 4 is kept in a horizontally horizontal state. Then, the rotation of the turntable 32 is stopped, and the toothed plate 35 is released to limit the turntable 32 to prevent the turntable 32 from rotating on its own. When the connecting plate 4 is unfolded to a horizontally horizontal state, the lower end of the support rod 2 will slide through the base plate 5. When the connecting plate 4 is fixed in a horizontally horizontal state, the base plate 5 will drive the lower end of the support rod 2 to be fixed. When the connecting plate 4 is away from the fixed base 31, the three support rods 2 will unfold together in an inclined position to form a tripod for support. When the ground is uneven and one of the support rods 2 needs to be adjusted individually, the fixing effect of the base plate 5 can be released. Then, push one of the support rods 2 to make the base plate 5 slide above the connecting plate 4 until the entire device is level and accurate. When it is not needed, the toothed plate 35 can be pulled open again and the turntable 32 can be reversed to make the transmission arm 33 pull the limit plate 34 back into the cavity of the fixed base 31. Then, simply release the fixing effect of the three base plates 5 and push the three support rods 2 together toward the fixed base 31. At this time, the connecting plate 4 will be pushed downward and gradually become vertical, and the pushed support rods 2 will also gradually become vertical, reducing the overall footprint.

[0039] The above describes the entire working principle of this invention.

[0040] In this invention, the installation, connection, or setting methods of all the above components are common mechanical methods, and the specific structure, model, and coefficient indicators of all components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be described in detail.

[0041] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

[0042] In this invention, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are merely used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. An adjustable positioning device for land surveying, comprising a mounting base (1) and a support rod (2), wherein the support rod (2) is movably hinged to the side of the mounting base (1), characterized in that: An adjustment component (3) is vertically arranged below the mounting base (1). A connecting plate (4) is hinged to the side of the adjustment component (3). A base plate (5) is slidably connected to the upper end of the connecting plate (4). A support component (6) is installed at the end of the connecting plate (4) away from the adjustment component (3). The adjustment assembly (3) includes a fixed base (31) and a turntable (32) installed in the middle of the inner cavity of the fixed base (31). A transmission arm (33) is hinged at an interval on the upper end of the turntable (32). A limit plate (34) is hinged at the end of the transmission arm (33) away from the turntable (32). A toothed plate (35) is provided on one side of the turntable (32).

2. The adjustable positioning device for land surveying as described in claim 1, characterized in that: The lower end of the support rod (2) is fixedly connected to a sleeve (21), and the lower end of the sleeve (21) is movably inserted with a support leg (22). A threaded hole (23) is opened on one side of the lower end of the sleeve (21), and a locking screw (24) is threaded inside the threaded hole (23).

3. The adjustable positioning device for land surveying as described in claim 1, characterized in that: The fixed seat (31) has a protruding plate (311) fixedly welded to its side. A through groove (312) is opened on the side surface of the fixed seat (31). The through groove (312) is located in the middle of the protruding plate (311). An adjustment groove (313) is opened on one side surface of the fixed seat (31). A slide rail (314) is symmetrically installed on the bottom side of the inner cavity of the fixed seat (31) near the adjustment groove (313).

4. The adjustable positioning device for land surveying as described in claim 1, characterized in that: The lower end of the turntable (32) is connected to a gear (321), and a rotating shaft (322) is connected between the turntable (32) and the gear (321). An adjustment knob (323) is installed on the upper end of the rotating shaft (322), and the adjustment knob (323) is located in the middle of the upper end of the fixed base (31).

5. The adjustable positioning device for land surveying as described in claim 1, characterized in that: A buffer spring (351) is installed on the side of the toothed plate (35) away from the turntable (32), and a sliding plate (352) is symmetrically installed on the lower end of the toothed plate (35).

6. The adjustable positioning device for land surveying as described in claim 1, characterized in that: The connecting plate (4) has a guide groove (41) in the middle, and grooves (42) are symmetrically opened on the inner walls of both sides of the guide groove (41). The guide groove (41) and the grooves (42) form a cross structure. The connecting plate (4) has a slot (43) in the middle on the side near the fixed seat (31).

7. The adjustable positioning device for land surveying as described in claim 1, characterized in that: The base plate (5) is fixedly installed with a lug (51) at the upper end. The bottom end of the base plate (5) near the fixed seat (31) is fixedly installed with a guide slider (52). A connecting hole (53) is opened between the base plate (5) and the guide slider (52). An adjusting screw (54) is threaded inside the connecting hole (53). Movable holes (55) are symmetrically opened on both sides of the guide slider (52). A ball bearing (56) is movably arranged inside the movable hole (55).

8. The adjustable positioning device for land surveying as described in claim 1, characterized in that: The support assembly (6) includes a fixed cylinder (61) and vertical grooves (62) symmetrically opened on both sides of the fixed cylinder (61). A piston seat (63) is movably connected to the inner cavity of the fixed cylinder (61). A spiral cone (64) is fixedly connected to the bottom of the piston seat (63). Pressure plates (65) are symmetrically installed on both sides of the piston seat (63).

9. An adjustable positioning device for land surveying as described in claim 8, characterized in that: The bottom of the fixed cylinder (61) is provided with a through hole (611), the diameter of the through hole (611) is larger than that of the spiral cone (64), and the diameter of the piston seat (63) is larger than that of the through hole (611).

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