Elastic rotating device for optical surveying and mapping holder

Abstract

The utility model discloses an elastic rotating device for an optical surveying and mapping holder, which comprises a base, a double-shaft motor is arranged in the middle of the base, support plates are respectively arranged on the left side and the right side of the base, and the left end and the right end of a main shaft of the double-shaft motor are respectively connected with a prism mounting bracket through an elastic coupling. The left end of the left elastic coupling is rotationally connected to the left supporting plate, the right end of the right elastic coupling is rotationally connected to the right supporting plate, and the rear side of the base is provided with an adjustable positioning frame used for positioning the prism installation support. According to the utility model, the double-shaft motor is adopted to simultaneously drive the two elastic couplings, the prism mounting bracket and the total reflection prism assembly to rotate, and then the height of the prism in the total reflection prism assembly is adjusted, so that no interference phenomenon occurs when distance measurement is carried out on a plurality of measurement points on the same straight line; and meanwhile, good stability is achieved at the high position and the low position. And the total reflection prism assembly is rotated and folded, so that the storage is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of surveying and mapping engineering technology, and specifically relates to an elastic rotation device for optical surveying gimbals. Background Technology

[0002] A total station, short for a total station electronic tachometer, is an optoelectronic instrument combining an electronic theodolite, an electro-optical distance meter, and a microprocessor. In surveying, total stations are used to measure distances at various points. A total internal reflection prism is installed at each measurement point to reflect the laser emitted by the total station, thus determining the distance. In some cases, multiple measurement points may overlap on a straight line. Currently, the total internal reflection prisms installed at these points cannot be height-adjusted. To avoid interference, there is a need to design an automatic folding and lifting platform for mounting the total internal reflection prism. This platform would use a motor to drive the prism's rotation via a flexible coupling, allowing for convenient height adjustment and good stability at both the highest and lowest points. Utility Model Content

[0003] The purpose of this invention is to provide a flexible rotating device for optical mapping gimbals that allows for easy adjustment of the height of the total internal reflection prism and offers high stability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an elastic rotation device for an optical mapping gimbal, including a base, a dual-axis motor in the middle of the base, a support plate on the left and right sides of the base, and a prism mounting bracket connected to the left and right ends of the main shaft of the dual-axis motor through an elastic coupling. The left end of the left elastic coupling is rotatably connected to the left support plate, and the right end of the right elastic coupling is rotatably connected to the right support plate. An adjustable positioning frame for positioning the prism mounting bracket is provided on the rear side of the base.

[0005] The base includes an upper base plate and a lower base plate connected by a first bolt. An L-shaped support is provided in the middle of the upper surface of the upper base plate by a second bolt. The dual-axis motor is mounted on the L-shaped support by a third bolt. The flexible coupling includes an inner sleeve, an outer sleeve, and a torsion spring. The main shaft of the dual-axis motor extends into one end of the inner sleeve. The inner sleeve is pressed against the plane milled on the outer circle of the main shaft by a first set screw connected by a radial thread. The other end of the inner sleeve extends coaxially into the outer sleeve. The torsion spring is set in the outer sleeve and coaxially mounted on the outer circle of the inner sleeve. The spring arms extending from both ends of the torsion spring pass through the inner sleeve and the outer sleeve, respectively. A rotating shaft is coaxially and integrally provided on the outer end of the outer sleeve. A support plate is fixed on the left and right sides of the upper base plate, and the rotating shaft is rotatably connected to the support plate through bearings.

[0006] The prism mounting bracket includes a mounting plate located above the dual-axis motor. Connecting plates are fixedly connected to the bottom left and right sides of the mounting plate by the fourth bolt. The lower part of the connecting plate is provided with a U-shaped groove that fits around the outer circle of the rotating shaft. The connecting plate and the rotating shaft are connected by the fifth bolt. A positioning connecting pin is threaded in the middle of the mounting plate. A prism limiting block is provided on the mounting plate.

[0007] The adjustable positioning frame has a gate-shaped structure. A positioning screw is threaded to the middle of the upper part of the adjustable positioning frame. A V-shaped groove with vertical penetration is opened in the middle of the rear side of the mounting plate. The front end of the positioning screw has a positioning ball head that extends into the V-shaped groove and presses against the mounting plate. A second set screw is threaded to the top of the adjustable positioning frame. The lower end of the second set screw presses against the outer circle of the positioning screw.

[0008] The upper base plate is provided with a housing that covers the dual-axis motor. The housing extends rearward into the interior of the adjustable positioning frame. The rear end of the housing is provided with a waterproof connector for connecting wires to power the dual-axis motor.

[0009] The upper base plate has a threaded hole on the front side of the L-shaped support, and the lower base plate has a receiving hole corresponding to the threaded hole. A limit adjustment bolt that can contact the front side of the mounting plate is threaded into the threaded hole, and the lower end of the limit adjustment bolt extends into the receiving hole.

[0010] Using the above technical solution, a connecting seat is provided below the base of this utility model. The connecting seat includes a disc-shaped fixed connector. Three conical positioning heads are arranged in a circular array at the lower end of the fixed connector. A stud is provided at the center of the upper end of the fixed connector. A fixed disc is threaded onto the stud. An annular groove is formed on the outer circumference of the fixed disc. The lower part of the bottom of the annular groove is a cylindrical surface, and the upper part of the bottom of the annular groove is a conical surface that is wider at the top and narrower at the bottom. A mounting hole with the same diameter as the fixed disc is formed at the center of the lower base plate. The bottom surface of the lower base plate contacts the top surface of the fixed connector. The fixed disc extends into the mounting hole of the lower base plate. There is a gap between the top surface of the fixed disc and the bottom surface of the upper base plate. A locking device for fastening the base and the connecting seat is provided on the side of the lower base plate. The locking device includes a locking screw, a pressure post, a handle, and a guide post. A through threaded hole and a light hole are provided in the lower base plate along the radial direction of the fixed plate. The locking screw extends into and is threaded into the threaded hole. The pressure post is set in the light hole. A guide hole is provided in the lower base plate below the light hole. The length direction of the guide hole is parallel to the center line of the light hole. The guide post is a screw threaded into the pressure post. The screw head is slidably connected in the guide hole. The handle is fixed to the outer end of the locking screw. The outer end of the guide post is pressed against the inner end of the locking screw. The inner end of the pressure post is pressed against the conical surface of the bottom of the annular groove on the outer circle of the fixed plate. The inner end of the guide post is spherical.

[0011] The fixed connector of this invention is installed on the point-aligning base at the top of the tripod, and the tripod is placed at the measurement point. The total internal reflection prism assembly is inserted into the positioning connecting pin in the middle of the mounting plate, thus ensuring that the total internal reflection prism assembly is securely mounted on the mounting plate of this invention.

[0012] When interference occurs when using a total station to survey multiple measurement points located on the same straight line, the dual-axis motor on the surveying platform at one or more measurement points is activated. The left and right ends of the main shaft of the dual-axis motor simultaneously drive the two inner sleeves to rotate. The inner sleeves drive the outer sleeve to rotate through an external torsion spring. The rotating shaft integrated with the outer sleeve drives the connecting plate and the mounting plate to rotate. The mounting plate drives the total internal reflection prism assembly set on the upper part to rotate, thereby reducing the height of the total internal reflection prism assembly and making the prism on the total internal reflection prism assembly not in the light line emitted by the total station, thus avoiding interference.

[0013] The start-to-stop time of the dual-axis motor is set according to its speed. The flexible coupling uses a torsion spring between the inner and outer sleeves. The dual-axis motor drives the inner sleeve, which in turn drives the outer sleeve to rotate via the torsion spring. The outer sleeve, through a rotating shaft, connecting plate, and mounting plate, drives the total internal reflection prism assembly to rotate around its centerline. During forward rotation, the height of the total internal reflection prism assembly decreases, and the V-groove on the rear side of the mounting plate disengages from the positioning ball head at the front end of the positioning screw. When the front side of the mounting plate contacts the upper end of the limit adjustment bolt, the dual-axis motor stops after a delay of 0.5-2 seconds. This allows the torsion spring to store force, and the front side of the mounting plate presses against the top of the limit adjustment bolt, thus ensuring the stability and reliability of the total internal reflection prism assembly. When adjusting the height of the total internal reflection prism assembly to move upward, the dual-axis motor is started. The main shaft of the dual-axis motor rotates in the opposite direction. According to the torque transmission process described above, it drives the mounting plate and the total internal reflection prism assembly to rotate backward and upward. When the V-groove on the rear side of the mounting plate contacts the positioning ball head at the front end of the positioning screw, the dual-axis motor stops after a delay of 0.5-2 seconds. The torsion spring stores force, and the rear side of the mounting plate presses against the positioning ball head at the front end of the positioning screw, thereby ensuring the stability and reliability of the total internal reflection prism assembly at its highest height (vertical state).

[0014] After the base and its components have rotated horizontally around the fixed plate into position, rotate the handle to drive the locking screw to move axially, driving the pressure post to move inward along the light hole until the inner end of the pressure post is pressed into the annular groove on the outer circle of the fixed plate. Because the inner end of the pressure post is pressed against the conical surface at the bottom of the annular groove on the outer circle of the fixed plate, there will be an upward pressing force on the fixed plate, so that the top surface of the fixed connector and the bottom surface of the lower substrate have a certain pressure, ensuring the reliability of the positioning after rotation adjustment.

[0015] The inner sleeve is press-fitted to the milled plane on the spindle of the dual-axis motor via a first set screw, facilitating manufacturing, installation, and disassembly. The outer sleeve has a coaxially integrated rotating shaft at its outer end, which is rotatably connected to the support plate via a bearing. The two rotating shafts are connected to the mounting plate via a connecting plate. This split-type manufacturing and installation structure not only offers better reliability but also makes the structure more compact and easier to install and disassemble. A positioning connecting pin in the middle of the mounting plate is used to install the total internal reflection prism assembly.

[0016] The positioning screw can adjust the forward extension length of the positioning ball head at the front end, thereby adjusting the top-pressing engagement position with the V-groove on the rear side of the mounting plate, i.e., adjusting the maximum height of the total reflection prism assembly. After adjusting the position of the positioning screw, the second setter screw presses against the positioning screw to prevent rotation and ensure that the front-to-back position of the positioning ball head remains unchanged. The engagement between the V-groove and the positioning ball head can also position the mounting plate in the left-to-right direction.

[0017] Since this invention is intended for outdoor use, a housing is provided on the substrate to cover the dual-axis motor, and a waterproof connector is provided to provide waterproof and dustproof protection.

[0018] Since the limit adjustment bolt is threaded to the upper base plate, the height of the limit adjustment bolt can be adjusted by rotation, thereby adjusting the rotation angle of the mounting plate, that is, adjusting the downward rotation distance of the total reflection prism assembly.

[0019] In summary, this invention is scientifically sound and compactly structured. By employing a dual-axis motor to simultaneously drive two flexible couplings, a prism mounting bracket, and the total internal reflection prism assembly to rotate, the height of the prism in the total internal reflection prism assembly is adjusted. This ensures that no interference occurs when measuring distances at multiple points along the same straight line, while also exhibiting good stability at both high and low positions. Furthermore, the foldable design of the total internal reflection prism assembly facilitates storage. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention from a frontal view.

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention from a rear view.

[0022] Figure 3 This is a partial cross-sectional view of the front of this utility model.

[0023] Figure 4 yes Figure 3 Enlarged view of section A. Detailed Implementation

[0024] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0025] like Figures 1-4 As shown, the optical surveying gimbal includes a horizontally arranged connecting seat, a base rotatably connected to the top of the connecting seat, a dual-axis motor 1 with its center line horizontally arranged in the left-right direction on the base, and a prism mounting bracket connected to the left and right ends of the main shaft of the dual-axis motor 1 through a flexible coupling 2, and an adjustable positioning frame 3 for positioning the prism mounting bracket is provided on the rear side of the base.

[0026] The connector includes a disc-shaped fixed connector 4. The lower end of the fixed connector 4 is provided with three conical positioning heads 5 arranged in a circumferential array. The upper end of the fixed connector 4 is provided with a stud 6. A fixed disc 7 is threaded onto the stud 6. The outer circle of the fixed disc 7 is provided with an annular groove 8. The lower part of the bottom of the annular groove 8 is a cylindrical surface 9, and the upper part of the bottom of the annular groove 8 is a conical surface 10 that is thicker at the top and thinner at the bottom.

[0027] The base includes an upper base plate 12 and a lower base plate 13 connected by a first bolt 11. The lower base plate 13 has a mounting hole with the same diameter as the fixing plate 7 at its center. The bottom surface of the lower base plate 13 contacts the top surface of the fixing connector 4. The fixing plate 7 extends into the mounting hole of the lower base plate 13. There is a gap between the top surface of the fixing plate 7 and the bottom surface of the upper base plate 12. The side of the lower base plate 13 is provided with a locking device for fastening the base and the connecting seat.

[0028] The locking device includes a locking screw 14, a pressure post 15, a handle 16, and a guide post 17. A through threaded hole 18 and a light hole 19 are provided in the lower base plate 13 along the radial direction of the fixed plate 7. The locking screw 14 extends into and is threaded into the threaded hole 18. The pressure post 15 is disposed in the light hole 19. A guide hole 20 is provided in the lower base plate 13 below the light hole 19. The length direction of the guide hole 20 is parallel to the center line of the light hole 19. The guide post 17 is a screw threaded into the pressure post 15. The screw head is slidably connected in the guide hole 20. The handle 16 is fixedly disposed on the outer end of the locking screw 14. The outer end of the guide post 17 is press-fitted with the inner end of the locking screw 14. The inner end of the pressure post 15 is press-fitted with the conical surface 10 at the bottom of the annular groove 8 on the outer circle of the fixed plate 7. The inner end of the guide post 17 is spherical.

[0029] An L-shaped support 22 is provided in the middle of the upper surface of the upper base plate 12 via a second bolt 21. The dual-axis motor 1 is mounted on the L-shaped support 22 via a third bolt 23. The flexible coupling 2 includes an inner sleeve 24, an outer sleeve 25, and a torsion spring 26. The main shaft of the dual-axis motor 1 extends into one end of the inner sleeve 24. The inner sleeve 24 is pressed against the plane milled on the outer circle of the main shaft via a first set screw 27 connected by a radial thread. The other end of the inner sleeve 24 extends coaxially into the outer sleeve 25. The torsion spring is set inside the outer sleeve 25 and coaxially mounted on the outer circle of the inner sleeve 24. The spring arms 28 extending from both ends of the torsion spring 26 pass through the inner sleeve 24 and the outer sleeve 25 respectively. A rotating shaft 29 is coaxially and integrally provided at the outer end of the outer sleeve 25. A support plate 30 is fixedly provided on the left and right sides of the upper base plate 12 respectively. The rotating shaft 29 is rotatably connected to the support plate 30 via a bearing 31.

[0030] The prism mounting bracket includes a mounting plate 32 located above the dual-axis motor 1. The bottom of the left and right sides of the mounting plate 32 is fixedly connected to a connecting plate 34 by a fourth bolt 33. The lower part of the connecting plate 34 is provided with a U-shaped groove that fits on the outer circle of the rotating shaft 29. The connecting plate 34 and the rotating shaft 29 are connected by a fifth bolt 35. A positioning connecting pin 36 is threadedly connected to the middle of the mounting plate 32. A prism limiting block 44 is provided on the mounting plate 32.

[0031] The adjustable positioning frame 3 has a gate-shaped structure. A positioning screw 37 is threadedly connected to the middle of the upper part of the adjustable positioning frame 3. A V-shaped groove 38 with vertical penetration is opened in the middle of the rear side of the mounting plate 32. The front end of the positioning screw 37 is provided with a positioning ball head 39 that extends into the V-shaped groove 38 and presses against the mounting plate 32. A second set screw 40 is threadedly connected to the top of the adjustable positioning frame 3. The lower end of the second set screw 40 is pressed against the outer circle of the positioning screw 37.

[0032] The upper base plate 12 is provided with a housing 41 that covers the dual-axis motor 1. The housing 41 extends rearward into the interior of the adjustable positioning frame 3. The rear end of the housing 41 is provided with a waterproof connector 42 for connecting wires to supply power to the dual-axis motor 1.

[0033] A threaded hole 18 is provided on the upper base plate 12 on the front side of the L-shaped support 22, and a receiving hole corresponding to the threaded hole 18 is provided on the lower base plate 13. A limiting adjustment bolt 43 that can contact the front side of the mounting plate 32 is threadedly connected to the threaded hole 18, and the lower end of the limiting adjustment bolt 43 extends into the receiving hole.

[0034] The fixed connector 4 of this invention is installed on the point-aligning base at the top of the tripod, and the tripod is placed at the measurement point. The total internal reflection prism assembly 45 is inserted into the positioning connecting pin 36 in the middle of the mounting plate 32, so that the total internal reflection prism assembly 45 is securely installed on the mounting plate 32 of this invention.

[0035] When interference occurs when using a total station to survey multiple measurement points located on the same straight line, the dual-axis motor 1 on the surveying platform at one or more measurement points is activated. The left and right ends of the main shaft of the dual-axis motor 1 simultaneously drive the two inner sleeves 24 to rotate. The inner sleeves 24 drive the outer sleeves 25 to rotate through the external torsion springs 26. The rotating shaft 29 integrated with the outer sleeves 25 drives the connecting plate 34 and the mounting plate 32 to rotate. The mounting plate 32 drives the total internal reflection prism assembly 45 set on the upper part to rotate, thereby reducing the height of the total internal reflection prism assembly 45 so that the prism on the total internal reflection prism assembly 45 is not on the light line emitted by the total station, thus avoiding interference.

[0036] The start-to-stop time of the dual-axis motor 1 is set according to its rotational speed. The flexible coupling 2 uses a torsion spring 26 between the inner sleeve 24 and the outer sleeve 25. The dual-axis motor 1 drives the inner sleeve 24, which in turn drives the outer sleeve 25 to rotate via the torsion spring 26. The outer sleeve 25, through the rotating shaft 29, connecting plate 34, and mounting plate 32, drives the total internal reflection prism assembly 45 to rotate around its centerline. During forward rotation, the height of the total internal reflection prism assembly 45 decreases, and the V-groove 38 on the rear side of the mounting plate 32 disengages from the positioning ball head 39 at the front end of the positioning screw 37. When the front side of the mounting plate 32 contacts the upper end of the limit adjustment bolt 43, the dual-axis motor 1 stops after a delay of 0.5-2 seconds. This allows the torsion spring 26 to store force, and the front side of the mounting plate 32 presses against the top of the limit adjustment bolt 43, thus ensuring the stability and reliability of the total internal reflection prism assembly 45. When adjusting the height of the total internal reflection prism assembly 45 to move upward, the dual-axis motor 1 is started. The main shaft of the dual-axis motor 1 rotates in the opposite direction. According to the torque transmission process described above, it drives the mounting plate 32 and the total internal reflection prism assembly 45 to rotate backward and upward. When the V-groove 38 on the rear side of the mounting plate 32 contacts the positioning ball head 39 at the front end of the positioning screw 37, the dual-axis motor 1 stops after a delay of 0.5-2 seconds. The torsion spring 26 stores force, and the rear side of the mounting plate 32 presses against the positioning ball head 39 at the front end of the positioning screw 37, thereby ensuring the stability and reliability of the total internal reflection prism assembly 45 at its highest height (vertical state).

[0037] After the base and its components are rotated horizontally around the fixed plate 7 into position, the handle 16 is rotated to drive the locking screw 14 to move axially, driving the pressure column 15 to move inward along the light hole 19 until the inner end of the pressure column 15 is pressed into the annular groove 8 on the outer circle of the fixed plate 7. Since the inner end of the pressure column 15 is pressed and engaged with the conical surface 10 at the bottom of the annular groove 8 on the outer circle of the fixed plate 7, there will be an upward pressing force on the fixed plate 7, so that the top surface of the fixed connector 4 and the bottom surface of the lower substrate 13 have a certain pressure, ensuring the reliability of the positioning after rotation adjustment.

[0038] The inner sleeve 24 is pressed against the plane milled on the spindle of the dual-axis motor 1 via the first set screw 27, facilitating processing, manufacturing, installation, and disassembly. The outer sleeve 25 has a coaxially integrated rotating shaft 29 at its outer end. The rotating shaft 29 is rotatably connected to the support plate 30 via a bearing 31. The two rotating shafts 29 are connected to the mounting plate 32 via a connecting plate 34. This split manufacturing and installation structure not only has better reliability but also makes the structure more compact and convenient for installation and disassembly. The positioning connecting pin 36 in the middle of the mounting plate 32 is used to install the total reflection prism assembly 45.

[0039] The positioning screw 37 can adjust the forward extension length of the positioning ball head 39 at the front end, thereby adjusting the top-pressing engagement position with the V-groove 38 on the rear side of the mounting plate 32, i.e., adjusting the maximum height of the total reflection prism assembly 45. After adjusting the position of the positioning screw 37, the second setter screw 40 presses against the positioning screw 37 to prevent the positioning screw 37 from rotating, ensuring that the front-back position of the positioning ball head 39 remains unchanged. The engagement between the V-groove 38 and the positioning ball head 39 can also position the mounting plate 32 in the left-right direction.

[0040] Since this utility model is used outdoors, a housing 41 is provided on the substrate to cover the dual-axis motor 1, and a waterproof connector 42 is provided to provide waterproof and dustproof functions.

[0041] Since the limiting adjustment bolt 43 is threadedly connected to the upper base plate 12, the height of the limiting adjustment bolt 43 can be adjusted by rotation, thereby adjusting the rotation angle of the mounting plate 32, that is, adjusting the downward rotation distance of the total reflection prism assembly 45.

[0042] The tripod, the alignment base, the dual-axis motor 1, the torsion spring 26, the bearing 31, the fixed connector 4, and the total reflection prism assembly 45 in this utility model are all commercially available.

[0043] The above embodiments illustrate the basic principles and features of this utility model. However, the above descriptions are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the protection scope of this utility model. Therefore, the patent and its scope of protection should be determined by the appended claims.

Claims

1. An elastic rotating device for an optical surveying head, characterized in that: The device includes a base with a dual-axis motor in the middle. There are support plates on the left and right sides of the base. The left and right ends of the main shaft of the dual-axis motor are connected to a prism mounting bracket through a flexible coupling. The left end of the flexible coupling on the left side is rotatably connected to the support plate on the left side, and the right end of the flexible coupling on the right side is rotatably connected to the support plate on the right side. An adjustable positioning frame for positioning the prism mounting bracket is provided on the rear side of the base.

2. The elastic rotating device for an optical surveying head as claimed in claim 1, characterized in that: The base includes an upper base plate and a lower base plate connected by a first bolt. An L-shaped support is provided in the middle of the upper surface of the upper base plate by a second bolt. The dual-axis motor is mounted on the L-shaped support by a third bolt. The flexible coupling includes an inner sleeve, an outer sleeve, and a torsion spring. The main shaft of the dual-axis motor extends into one end of the inner sleeve. The inner sleeve is pressed against the plane milled on the outer circle of the main shaft by a first set screw connected by a radial thread. The other end of the inner sleeve extends coaxially into the outer sleeve. The torsion spring is set in the outer sleeve and coaxially mounted on the outer circle of the inner sleeve. The spring arms extending from both ends of the torsion spring pass through the inner sleeve and the outer sleeve, respectively. A rotating shaft is coaxially and integrally provided on the outer end of the outer sleeve. A support plate is fixed on the left and right sides of the upper base plate, and the rotating shaft is rotatably connected to the support plate through bearings.

3. The elastic rotating device for an optical surveying head as claimed in claim 2, characterized in that: The prism mounting bracket includes a mounting plate located above the dual-axis motor. Connecting plates are fixedly connected to the bottom left and right sides of the mounting plate by the fourth bolt. The lower part of the connecting plate is provided with a U-shaped groove that fits around the outer circle of the rotating shaft. The connecting plate and the rotating shaft are connected by the fifth bolt. A positioning connecting pin is threaded in the middle of the mounting plate. A prism limiting block is provided on the mounting plate.

4. The elastic rotating device for an optical surveying head as claimed in claim 3, characterized in that: The adjustable positioning frame has a gate-shaped structure. A positioning screw is threaded to the middle of the upper part of the adjustable positioning frame. A V-shaped groove with vertical penetration is opened in the middle of the rear side of the mounting plate. The front end of the positioning screw has a positioning ball head that extends into the V-shaped groove and presses against the mounting plate. A second set screw is threaded to the top of the adjustable positioning frame. The lower end of the second set screw presses against the outer circle of the positioning screw.

5. The elastic rotating device for an optical surveying head as claimed in claim 4, characterized in that: The upper base plate is provided with a housing that covers the dual-axis motor. The housing extends rearward into the interior of the adjustable positioning frame. The rear end of the housing is provided with a waterproof connector for connecting wires to power the dual-axis motor.

6. The elastic rotating device for an optical surveying head as claimed in claim 2, characterized in that: The upper base plate has a threaded hole on the front side of the L-shaped support, and the lower base plate has a receiving hole corresponding to the threaded hole. A limit adjustment bolt that can contact the front side of the mounting plate is threaded into the threaded hole, and the lower end of the limit adjustment bolt extends into the receiving hole.

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