Foldable Beidou positioning handheld surveying instrument

Abstract

This utility model relates to the field of surveying instrument technology and proposes a foldable Beidou positioning handheld surveying instrument, including a base assembly for supporting the surveying instrument. The surveying instrument is used for positioning. One side of the surveying instrument is provided with a battery module for power supply and an external module for charging and connecting to external devices. The other side of the surveying instrument is provided with a control module for device control. A gyroscope centering assembly for stabilizing the surveying instrument is also provided between the base assembly and the surveying instrument. Through the design of structures such as an antenna sleeve and an antenna body, the antenna sleeve slides and is driven by a hinge shaft to achieve stepless telescopic folding of the antenna body. The damping slider moves synchronously along the limiting straight axis to ensure structural stability after unfolding, meeting the needs of rapid deployment in the field and portable storage. Through the above technical solution, the problems of insufficient storage and inadequate stability in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of surveying instrument technology, specifically to a foldable Beidou positioning handheld surveying instrument. Background Technology

[0002] Traditional handheld surveying instruments mostly employ fixed antenna structures, which suffer from three major drawbacks in field operations: low deployment efficiency, poor vibration resistance, and weak terrain adaptability. Specifically, the fixed antenna cannot be folded and stored, resulting in bulky and inconvenient equipment that is difficult to carry, significantly reducing efficiency in scenarios requiring rapid relocation of work sites; it directly affects the stability of BeiDou satellite signal reception, causing positioning data drift or distortion; furthermore, it can only achieve two-dimensional planar adjustment and cannot perform three-dimensional dynamic compensation, making it prone to systematic measurement errors due to equipment tilting in complex terrains such as slopes, forests, and gullies, leading to decreased data reliability.

[0003] These problems are particularly prominent in field scenarios such as forestry pest monitoring, geological disaster early warning, and border surveying. For example, when operating in mountainous forest areas, traditional equipment is too bulky to pass through narrow paths, increasing deployment time; antenna vibration and offset can interfere with the accuracy of BeiDou positioning, affecting the accurate mapping of pest spread paths; and leading to systematic deviations in surveying data. Utility Model Content

[0004] This invention proposes a foldable Beidou positioning handheld surveying instrument, which solves the problems of insufficient storage and instability in related technologies.

[0005] The technical solution of this utility model is as follows: a foldable Beidou positioning handheld surveying instrument, including a base assembly, which is used to support the base of the surveying instrument. The surveying instrument is used for positioning. One side of the surveying instrument is provided with a battery module for power supply and an external module for charging and connecting to external devices. The other side of the surveying instrument is provided with a control module for device control. A gyroscope centering assembly for stabilizing the surveying instrument is also provided between the base assembly and the surveying instrument. The surveying instrument has two antenna bodies for surveying assistance, which are arranged symmetrically.

[0006] In a preferred embodiment of this utility model, two symmetrically arranged hinge shafts are rotatably mounted inside the surveying instrument body. An antenna sleeve is provided on the outer circumferential surface of the hinge shaft. An antenna body is slidably mounted inside the antenna sleeve with interference fit. A limiting straight shaft is fixedly connected inside the surveying instrument body. Two symmetrically arranged damping sliders are provided on the outer circumferential surface of the limiting straight shaft. The damping sliders and the antenna sleeve are movably hinged together by a hinge shaft, which is used to assist in supporting the antenna sleeve.

[0007] As a preferred embodiment of this utility model, a sliding plate is fixedly connected to one side of the damping slider, a rack is provided on one side of the sliding plate, and a limit slide is provided on the other side of the sliding plate. The two sliding plates are arranged diagonally. At least two symmetrically arranged rotating shafts are installed inside the surveying instrument. An auxiliary gear is sleeved on the outer circumferential surface of the rotating shaft, and both racks mesh with the auxiliary gear.

[0008] In a preferred embodiment of this utility model, the base assembly comprises a top sleeve, an inner straight cylinder, a straight sleeve, and a fixed inner cylinder arranged axially along the axis of the inner cylinder. The top sleeve and the straight sleeve are both fitted onto the outer circumferential surface of the inner straight cylinder. A first height locking bolt is screwed to one side of the straight sleeve to fix the height of the inner straight cylinder. A second height locking bolt is threaded to one side of the top sleeve to fix the height of the top sleeve. A threaded joint is provided on the outer circumferential surface of the fixed inner cylinder, and the threaded joint is threaded into the inside of the straight sleeve to fix the connection of the inner cylinder.

[0009] As a preferred embodiment of this utility model, the internal movable hinge joint of the fixed inner cylinder has at least three circumferentially distributed hinge blocks, and a support frame is fixedly connected to one side of each hinge block. The support frame is used for placing the equipment. The top of the top sleeve is interference-fitted with a spherical joint, which is used for fixing the gyroscope centering assembly.

[0010] In a preferred embodiment of this utility model, the gyroscope centering assembly is composed of an axial semicircular fixing frame, a radial fixing frame, and a placement semicircular fixing frame arranged sequentially from the outside to the inside. Two symmetrically arranged first rotating fixing blocks are provided between the axial semicircular fixing frame and the radial fixing frame, and two symmetrically arranged second rotating fixing blocks are provided between the radial fixing frame and the placement semicircular fixing frame. Side plates are slidably mounted on the inner sides of both sides of the placement semicircular fixing frame. At least one auxiliary spring is provided between the side plates and the placement semicircular fixing frame. A damper is provided on the auxiliary spring. A plug-in plate is fixedly connected to the bottom of the surveying instrument by bolts. Friction plates are provided on both sides of the plug-in plate. The plug-in plate is inserted into the interior of the placement semicircular fixing frame. The plug-in plate and the friction plates are used for the insertion and fixing of the plug-in plate.

[0011] As a preferred embodiment of this utility model, the ball joint has an internal threaded groove inside, the bottom of the axial semi-circular fixing frame has a straight rod, the bottom of the straight rod has a connecting bolt, and the connecting bolt is threaded into the inside of the internal threaded groove.

[0012] In a preferred embodiment of this utility model, both the first rotating fixing block and the second rotating fixing block are composed of fixing bolts and connecting fixing seats. The fixing bolts pass through the interior of the axial semi-circular fixing frame and the radial fixing frame, and the radial fixing frame and the placement semi-circular fixing frame, respectively. A hexagonal nut is threaded onto the outer circumferential surface of the fixing bolt. The connecting fixing seat is fixedly connected to one side of the fixing bolt. A bearing is sleeved on the outer circumferential surface of the connecting fixing seat. The radial fixing frame and the placement semi-circular fixing frame are respectively sleeved on the outer circumferential surfaces of the four bearings. A handle is fixedly connected to the top of the surveying instrument.

[0013] The working principle and beneficial effects of this utility model are as follows: 1. This utility model, through the setting of antenna sleeve, antenna body and other structures, the antenna sleeve slides and is driven by the hinge shaft to realize the stepless telescopic folding of the antenna body, and the damping slider moves synchronously along the limiting straight axis to ensure the stability of the structure after unfolding, thus meeting the needs of rapid deployment in the field and portable storage.

[0014] 2. This utility model uses the structure of side plate and plug plate, etc. The auxiliary spring and spring damper on the side plate, together with the multi-layer rotating fixed block, absorb the measurement vibration. The gyroscope centering component and the base component realize the accurate centering of the surveying instrument. In addition, the low friction rotation characteristics of the bearing improve the positioning accuracy of the gyroscope centering component, so as to realize high-precision stable surveying and dynamic anti-vibration function. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the overall structure of this utility model; Figure 3 This is a front view of the base assembly of this utility model; Figure 4 This utility model Figure 3 Sectional view at point AA in the diagram; Figure 5 This is a schematic diagram of the overall structure of the gyroscope centering component of this utility model; Figure 6 This is a front view of the gyroscope centering component of this utility model; Figure 7 This utility model Figure 6 Sectional view at point BB in the middle; Figure 8 This utility model Figure 7 Enlarged view of section A in the image; Figure 9 This is a schematic diagram of the overall structure of the surveying instrument of this utility model; Figure 10 This is a schematic diagram of the antenna body transmission structure of this utility model; Figure 11 This utility model Figure 10 Enlarged view of section B in the image; Figure 12 This is a schematic diagram of the system of this utility model.

[0017] In the diagram: 1. Base assembly; 11. Straight sleeve; 12. First height locking bolt; 13. Top sleeve; 131. Inner straight cylinder; 132. Second height locking bolt; 14. Ball joint; 15. Fixed inner cylinder; 151. Threaded joint; 152. Support frame; 153. Hinge block; 2. Gyroscope centering assembly; 21. Straight rod; 22. Connecting bolt; 23. Axial semi-circular fixing frame; 24. First rotating fixing block; 25. Radial fixing circular frame; 26. Second rotating fixing block; 261. Fixing bolt; 262. Hexagonal nut; 263. Connecting fixing seat; 264. Bearing; 27. Placement of semi-circular fixing frame; 271. Side plate; 272. Auxiliary spring; 3. Surveying instrument; 31. Connector board; 311. Friction plate; 321. Battery module; 322. External module; 323. Control module; 324. Handle; 33. Limiting shaft; 331. Damping slider; 332. Sliding plate; 333. Rack; 334. Limiting slide plate; 34. Rotating shaft; 341. Auxiliary gear; 35. Antenna sleeve; 351. Hinge shaft; 352. Antenna body. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0019] Example 1 like Figures 1-12 As shown, a foldable Beidou positioning handheld surveying instrument includes a base assembly 1, which supports the base of the surveying instrument 3. The surveying instrument 3 is used for positioning. One side of the surveying instrument 3 is provided with a battery module 321 for power supply and an external module 322 for charging and connecting to external devices. The other side of the surveying instrument 3 is provided with a control module 323 for device control. The instrument is characterized in that a gyroscope centering assembly 2 for stabilizing the surveying instrument 3 is also provided between the base assembly 1 and the surveying instrument 3. The surveying instrument 3 has two antenna bodies 352 for surveying assistance inside, and the two antenna bodies 352 are arranged symmetrically.

[0020] In this embodiment, two symmetrically arranged hinge shafts 351 are rotatably mounted inside the surveyor 3 body. An antenna sleeve 35 is provided on the outer circumferential surface of the hinge shaft 351. An antenna body 352 is slidably arranged inside the antenna sleeve 35 with interference fit. A limiting straight shaft 33 is fixedly connected inside the surveyor 3 body. Two symmetrically arranged damping sliders 331 are provided on the outer circumferential surface of the limiting straight shaft 33. The damping sliders 331 and the antenna sleeve 35 are movably hinged together by the hinge shaft 351. The hinge shaft 351 is used to assist in supporting the antenna sleeve 35.

[0021] In this embodiment, a sliding plate 332 is fixedly connected to one side of the damping slider 331, a rack 333 is provided on one side of the sliding plate 332, and a limit slide 334 is provided on the other side of the sliding plate 332. The two sliding plates 332 are arranged diagonally. At least two symmetrically arranged rotating shafts 34 are rotatably installed inside the surveying instrument 3, and auxiliary gears 341 are sleeved on the outer circumferential surface of the rotating shafts 34.

[0022] In this embodiment, the base assembly 1 is composed of a top sleeve 13, an inner straight cylinder 131, a straight sleeve 11, and a fixed inner cylinder 15 arranged axially along the axis of the inner cylinder. The top sleeve 13 and the straight sleeve 11 are both sleeved on the outer circumferential surface of the inner straight cylinder 131. A first height locking bolt 12 is screwed to one side of the straight sleeve 11. The first height locking bolt 12 is used to fix the height of the inner straight cylinder 131. A second height locking bolt 132 is threaded to one side of the top sleeve 13. The second height locking bolt 132 is used to fix the height of the top sleeve 13. A threaded joint 151 is provided on the outer circumferential surface of the fixed inner cylinder 15. The threaded joint 151 is threaded into the inside of the straight sleeve 11 and is used to fix the connection of the inner cylinder 15.

[0023] In this embodiment, the inner cylinder 15 has at least three circumferentially distributed hinge blocks 153 on its internal movable hinge joint. A support frame 152 is fixedly connected to one side of the hinge block 153. The support frame 152 is used for placing the equipment. The top of the top sleeve 13 is interference-fitted with a ball joint 14. The ball joint 14 is used for fixing the gyroscope centering assembly 2.

[0024] In this embodiment, the gyroscope centering assembly 2 is composed of an axial semi-circular fixing frame 23, a radial fixing frame 25, and a placement semi-circular fixing frame 27 arranged sequentially from the outside to the inside. Two symmetrically arranged first rotating fixing blocks 24 are provided between the axial semi-circular fixing frame 23 and the radial fixing frame 25, and two symmetrically arranged second rotating fixing blocks 26 are provided between the radial fixing frame 25 and the placement semi-circular fixing frame 27. Side plates 271 are slidably mounted on the inner sides of both sides of the placement semi-circular fixing frame 27. At least one auxiliary spring 272 is provided between the side plates 271 and the placement semi-circular fixing frame 27. A damper is provided on the auxiliary spring 272. The bottom of the surveying instrument 3 is fixedly connected to the plug plate 31 by bolts. Friction plates 311 are provided on both sides of the plug plate 31. The plug plate 31 is inserted into the interior of the placement semi-circular fixing frame 27. The plug plate 31 and the friction plates 311 are used for the insertion and fixing of the plug plate 31.

[0025] In this embodiment, the ball joint 14 has an internal threaded groove, the bottom of the axial semi-circular fixing frame 23 has a straight rod 21, the bottom of the straight rod 21 has a connecting bolt 22, and the connecting bolt 22 is threaded into the inside of the internal threaded groove.

[0026] In this embodiment, both the first rotating fixing block 24 and the second rotating fixing block 26 are composed of fixing bolts 261 and connecting fixing seats 263. The fixing bolts 261 pass through the interior of the axial semi-circular fixing frame 23 and the radial fixing frame 25, and the radial fixing frame 25 and the placement semi-circular fixing frame 27, respectively. A hexagonal nut 262 is threaded on the outer circumferential surface of the fixing bolts 261. The connecting fixing seats 263 are fixedly connected to one side of the fixing bolts 261. Bearings 264 are sleeved on the outer circumferential surface of the connecting fixing seats 263. The radial fixing frame 25 and the placement semi-circular fixing frame 27 are respectively sleeved on the outer circumferential surface of the four bearings 264.

[0027] Example 1: Specifically, the foldable Beidou positioning handheld surveying instrument 3 consists of a base assembly 1, a gyroscope centering assembly 2, and the surveying instrument body 3. The base assembly 1 achieves height adjustment through the axial nesting of the top sleeve 13 and the straight sleeve 11. The first height locking bolt 12 fixes the position of the inner straight sleeve 131, and the second height locking bolt 132 locks the height of the top sleeve 13. The surveying instrument body 3 integrates a battery module 321 (the battery module 321 uses a high-capacity rechargeable lithium battery pack, supports long-term field operations, and has an internal intelligent power management system that can monitor the power level in real time and optimize power consumption distribution, prioritizing the stable power supply to the Beidou positioning module and control module, while also enabling fast charging or emergency power supply through an external module) and an external... Module 322 (an external module integrating a charging interface and a data transmission port, supporting bidirectional data interaction; the data transmission port can connect to external devices to realize positioning data export, firmware upgrade, or remote control command reception, which expands the functional boundaries of the device and allows it to be integrated into a larger surveying network system) and control module 323, internally have two symmetrically arranged antenna bodies 352, and the gyroscope centering component 2 is connected to the base top sleeve 13 through a ball joint 14 to realize three-dimensional spatial positioning compensation. The bottom plug-in plate 31 of the surveying instrument 3 and the semi-circular fixing frame 27 for placing the gyroscope centering component 2 are plugged in through a friction plate 311 to ensure that the device is stable and does not deviate during measurement, thereby improving the portability and measurement accuracy requirements of the Beidou positioning handheld device.

[0028] Example 2: Specifically, the surveyor 3 body has two symmetrical hinge shafts 351 inside. The antenna sleeve 35 is slidably connected to the limiting shaft 33 through the damping slider 331. When the hinge shaft 351 drives the antenna sleeve 35 to unfold, the damping slider 331 moves synchronously along the limiting shaft 33. The hinge shaft 351 achieves interference fit of the antenna body 352 to form support. The sliding plate 332 is provided with racks 333 and limiting slide plates 334 on both sides respectively. The two diagonally arranged sliding plates 332 achieve linkage of transmission through the meshing of auxiliary gears 341 to ensure that the antenna sleeve 35 unfolds and retracts synchronously. When the antenna sleeve 35 is unfolded, the antenna body 352 is pulled. The antenna body 352 adopts an interference sliding design to achieve stepless telescopic adjustment within the antenna sleeve 35. The antenna body 352 receives signals and realizes the foldable function of the antenna module. At the same time, the damping structure ensures the structural stability after unfolding, adapting to the rapid deployment needs of field surveying operations.

[0029] Example 3: Specifically, the base assembly 1 adopts a multi-layer nested structure, with the top sleeve 13, inner straight cylinder 131, straight sleeve 11 and fixed inner cylinder 15 being axially assembled in sequence. The fixed inner cylinder 15 is connected to the straight sleeve 11 through a threaded joint 151. Three evenly distributed support frames 152 are hinged to the inner wall to achieve three-point support when the equipment is placed. The straight sleeve 11 is provided with a first height locking bolt 12 on its side wall to fix the height of the inner straight cylinder 131. The second height locking bolt 132 on the side wall of the top sleeve 13 adjusts the position of the top ball joint 14. The height can be adjusted by locking the bolts. The ball joint 14 is used to achieve multi-angle rotation positioning to meet the support adaptability requirements when surveying different terrains.

[0030] Example 4: Specifically, the gyroscope centering component 2 adopts a three-layer nested fixing structure. The axial semi-circular fixing frame 23 is connected to the base ball joint 14 through the straight rod 21. The radial fixing circular frame 25 and the placement semi-circular fixing frame 27 are rotatably connected through the first rotating fixing block 24 and the second rotating fixing block 26. The placement semi-circular fixing frame 27 is provided with a sliding side plate 271 and an auxiliary spring 272. Together with the friction plate 311, it realizes the elastic fixation of the measuring instrument 3 plug plate 31. The angle adjustment in three-dimensional space is realized through the multi-layer rotating fixing blocks. Combined with the spring damper, it absorbs the vibration energy during measurement and improves the dynamic stability during handheld measurement.

[0031] Example 5: The first rotating fixing block 24 consists of a fixing bolt 261, a hexagonal nut 262, a connecting fixing seat 263, and a bearing 264. The first rotating fixing block 24 realizes the rotational connection between the axial semi-circular fixing frame 23 and the radial fixing circular frame 25. The second rotating fixing block 26 adopts the same structure to realize the rotational connection between the radial fixing circular frame 25 and the semi-circular fixing frame 27. The bearing 264 is designed to reduce rotational friction resistance, and the hexagonal nut 262 realizes the preload adjustment to ensure the smoothness and positioning accuracy of each fixing frame during rotation, and meet the three-dimensional spatial adjustment requirements of the gyroscope centering component 2.

[0032] Example 6: Three evenly distributed support frames 152 are hinged inside the fixed inner cylinder 15 to achieve stable support when the equipment is placed. The ball joint 14 at the top of the top sleeve 13 is threadedly connected to the connecting bolt 22 at the bottom of the straight rod 21 of the gyroscope centering component 2 through the internal thread groove. After the bottom plug plate 31 of the surveyor 3 is inserted into the semi-circular fixed frame 27, the friction plate 311 and the side plate 271 are elastically clamped by the auxiliary spring 272. The dual fixing method of thread fastening and spring elastic clamping ensures the positional stability of the surveyor 3 during the measurement process, while meeting the portability requirements of quick disassembly, which is in line with the operation characteristics of the Beidou positioning handheld device.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A foldable Beidou positioning handheld surveying instrument, comprising a base assembly (1), the base assembly (1) being used for base support of a surveying instrument (3), the surveying instrument (3) being used for positioning, a battery module (321) for power supply and an external module (322) for charging and connection to external devices being provided on one side of the surveying instrument (3), and a control module (323) for device control being provided on the other side of the surveying instrument (3), characterized in that, A gyroscope alignment component (2) for stabilizing the measurement of the surveying instrument (3) is also provided between the base assembly (1) and the surveying instrument (3). The surveying instrument (3) is equipped with two antenna bodies (352) for surveying assistance, and the two antenna bodies (352) are arranged symmetrically.

2. The foldable Beidou positioning handheld surveying instrument according to claim 1, characterized in that, The surveying instrument (3) has two symmetrically arranged hinge shafts (351) inside its main body. An antenna sleeve (35) is provided on the outer circumferential surface of the hinge shaft (351). An antenna body (352) is provided inside the antenna sleeve (35) with interference fit and sliding. A limiting straight shaft (33) is fixedly connected inside the surveying instrument (3). Two symmetrically arranged damping sliders (331) are provided on the outer circumferential surface of the limiting straight shaft (33). The damping sliders (331) and the antenna sleeve (35) are movably hinged together by the hinge shaft (351). The hinge shaft (351) is used to assist in the support of the antenna sleeve (35).

3. The foldable Beidou positioning handheld surveying instrument according to claim 2, characterized in that, A sliding plate (332) is fixedly connected to one side of the damping slider (331). A rack (333) is provided on one side of the sliding plate (332). A limit slide (334) is provided on the other side of the sliding plate (332). The two sliding plates (332) are arranged diagonally. At least two symmetrically arranged rotating shafts (34) are installed inside the surveying instrument (3). An auxiliary gear (341) is sleeved on the outer circumferential surface of the rotating shaft (34).

4. The foldable Beidou positioning handheld surveying instrument according to claim 3, characterized in that, The base assembly (1) is composed of a top sleeve (13), an inner straight cylinder (131), a straight sleeve (11), and a fixed inner cylinder (15) arranged axially along the axis of the inner cylinder. The top sleeve (13) and the straight sleeve (11) are both sleeved on the outer circumferential surface of the inner straight cylinder (131). A first height locking bolt (12) is screwed to one side of the straight sleeve (11) and is used to fix the height of the inner straight cylinder (131). A second height locking bolt (132) is threaded to one side of the top sleeve (13) and is used to fix the height of the top sleeve (13). A threaded joint (151) is provided on the outer circumferential surface of the fixed inner cylinder (15). The threaded joint (151) is threaded to the inside of the straight sleeve (11) and is used to fix the connection of the inner cylinder (15).

5. The foldable Beidou positioning handheld surveying instrument according to claim 4, characterized in that, The fixed inner cylinder (15) is internally hinged with at least three circumferentially distributed hinge blocks (153). A support frame (152) is fixedly connected to one side of the hinge block (153). The support frame (152) is used for placing the equipment. The top of the top sleeve (13) is interference-fitted with a ball joint (14). The ball joint (14) is used for fixing the gyroscope centering assembly (2).

6. The foldable Beidou positioning handheld surveying instrument according to claim 5, characterized in that, The gyroscope centering assembly (2) is composed of an axial semicircular fixing frame (23), a radial fixing frame (25), and a placement semicircular fixing frame (27) arranged sequentially from the outside to the inside. Two symmetrically arranged first rotating fixing blocks (24) are provided between the axial semicircular fixing frame (23) and the radial fixing frame (25). Two symmetrically arranged second rotating fixing blocks (26) are provided between the radial fixing frame (25) and the placement semicircular fixing frame (27). Side plates (26) are slidably mounted on the inner sides of both sides of the placement semicircular fixing frame (27). 71), at least one auxiliary spring (272) is provided between the side plate (271) and the semi-circular fixing frame (27), and a damper is provided on the auxiliary spring (272). The bottom of the surveying instrument (3) is fixedly connected to the plug plate (31) by bolts. Friction plates (311) are provided on both sides of the plug plate (31). The plug plate (31) is inserted into the interior of the semi-circular fixing frame (27). The plug plate (31) and the friction plates (311) are used for the plug-in fixing of the plug plate (31).

7. The foldable Beidou positioning handheld surveying instrument according to claim 6, characterized in that, The ball joint (14) has an internal thread groove inside, and the bottom of the axial semi-circular fixing frame (23) has a straight rod (21). The bottom of the straight rod (21) has a connecting bolt (22), which is threaded into the inside of the internal thread groove.

8. The foldable Beidou positioning handheld surveying instrument according to claim 6, characterized in that, The first rotating fixing block (24) and the second rotating fixing block (26) are both composed of fixing bolts (261) and connecting fixing seats (263). The fixing bolts (261) pass through the interior of the axial semi-circular fixing frame (23) and the radial fixing frame (25), the radial fixing frame (25) and the placement semi-circular fixing frame (27), respectively. The outer circumferential surface of the fixing bolts (261) is threaded with hexagonal nuts (262). The connecting fixing seats (263) are fixedly connected to one side of the fixing bolts (261). The outer circumferential surface of the connecting fixing seats (263) is fitted with bearings (264). The radial fixing frame (25) and the placement semi-circular fixing frame (27) are respectively fitted on the outer circumferential surface of the four bearings (264).

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