High-precision total station

Abstract

The invention discloses a high-precision total station, which relates to the technical field of engineering measuring instruments and comprises a tripod, an instrument body and an auxiliary lofting mechanism, the auxiliary lofting mechanism comprises a shell, a scale and a winding and unwinding device, and a winding and unwinding opening is formed in the shell; a direction detection device is arranged at the collecting and releasing opening, and a display device is arranged at the tail end, extending out, of the ruler. Before the displacement of the prism is adjusted, the scale is pulled out to the prism and is kept straight, and then the positions of the prism and the end part of the scale are synchronously moved, so that the angle direction of the prism relative to the corresponding axis of the eyepiece of the total station can be obtained by utilizing the direction detection device; the prism holder can directly adjust the position according to the displayed data through the display device, the operation precision is high, a commander does not need to give commands and communicate for many times, and the prism holder is fast and efficient and is not affected by external factors such as distance and noise.

Description

Technical Field

[0001] The present application relates to the technical field of engineering surveying instruments, and in particular to a high-precision total station. Background Art

[0002] Total station is the abbreviation of total station electronic tachometer, which is a photoelectric instrument that combines electronic theodolite, photoelectric distance meter and microprocessor. Total station has many uses such as angle measurement, distance (slant distance, horizontal distance, height difference) measurement, three-dimensional coordinate measurement, traverse measurement, intersection point measurement and layout measurement.

[0003] When the total station is used for layout measurement, it needs to be operated with a prism. In the "layout point coordinate setting" operation step, it is necessary to instruct the person holding the prism to move the position, first move the prism to the axis corresponding to the eyepiece, and then move the prism closer to or away from the total station until the parameters display dh=0, dz=0. At this time, the position of the prism is the layout point position.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the following defects exist: during the entire stocking measurement process, due to the long distance or noise, it is often difficult for the prism holder to quickly and accurately hear the commander's orders, and the accuracy of the displacement direction and distance is also difficult to control, resulting in the step of commanding the prism to adjust the position taking the longest time and being the most cumbersome to operate, which needs to be improved. Summary of the invention

[0005] In order to solve the problem that the prism movement process is time-consuming and cumbersome to operate, the present application provides a high-precision total station.

[0006] The high-precision total station provided in this application adopts the following technical solution: A high-precision total station comprises a tripod and an instrument body arranged at the upper end of the tripod. The high-precision total station also comprises an auxiliary layout mechanism arranged at one side of the instrument body; the auxiliary layout mechanism comprises a shell, a strip-shaped ruler arranged in the shell, and a reeling device for controlling the retraction and release of the ruler, the shell is provided with a retracting opening for releasing and retracting one end of the ruler; a direction detection device for detecting the extension direction of the ruler is arranged at the retracting opening, a display device is arranged at the end of the ruler extending out, and the display device is used to receive an electrical signal transmitted by the direction detection device and display direction data; the auxiliary layout mechanism also comprises a power supply module for supplying power to the display device and the direction detection device.

[0007] By adopting the above technical solution, before adjusting the prism for displacement, the ruler is pulled out to the prism and kept straight, and then the position of the prism and the end of the ruler are moved synchronously, so that the angular direction of the prism relative to the corresponding axis of the eyepiece of the total station can be obtained using the direction detection device, and the prism holder can use the display device to directly adjust the position according to the displayed data, and the operation is highly accurate, without the commander having to issue commands and communicate multiple times, which is fast and efficient, and will not be affected by external factors such as distance and noise.

[0008] Optionally, the direction detection device includes a swinging member rotatably connected to the retractable opening and an angle sensor arranged in the swinging member; the swinging member is provided with a limit opening for the ruler to pass through, and when the ruler passes through the limit opening, the swinging member is driven to rotate in the extension direction of the ruler itself.

[0009] By adopting the above technical solution, the extension direction of the ruler is converted into the rotation angle of the swinging part, and then the rotation angle of the swinging part is detected by the angle sensor. Compared with directly detecting the soft ruler, the data precision is higher and more accurate.

[0010] Optionally, a length detection device is provided in the shell, and the display device can receive the electrical signal transmitted by the length detection device and display the length data; the length detection device includes a rotation sensor and a matching rotating sleeve, the rotating sleeve is rotatably connected in the guide arm and the axis is perpendicular to the displacement direction of the scale; the rotating sleeve is provided with positioning teeth along the circumferential direction, and the scale is evenly provided with positioning holes for engaging with the positioning teeth along its own length direction.

[0011] By adopting the above technical solution, the ruler can drive the rotating sleeve to rotate during the process of retracting and releasing, and the rotation sensor is used to detect the number of revolutions of the rotating sleeve. The length of the ruler released can be obtained according to the corresponding formula and displayed to the prism holder on the display device; and when the commander gives the distance between the prism and the layout point, the prism holder can accurately move the required distance according to the length of the ruler retracted when moving forward, and can also adjust the direction in real time according to the data of the direction detection device during the movement toward the total station, so as to achieve accurate and rapid arrival at the layout point.

[0012] Optionally, the ruler includes an outer skin and a plurality of copper cores arranged in the outer skin; the copper cores are flexible, filament-like or thin-strip-like, and extend along the length direction of the ruler; the copper cores are connected between the display device and the direction detection device to realize a conductive loop; the power supply module supplies power to the display device through the copper cores.

[0013] By adopting the above technical solution, the copper core is used to realize the electrical signal transmission and power supply function of the display device, which is more stable and convenient compared with built-in batteries and other signal transmission methods.

[0014] Optionally, a conductive slip ring is arranged in the shell, and the conductive slip ring includes a rotor terminal and a stator terminal. The inner copper core of the scale is electrically connected to the rotor terminal, and the stator terminal is electrically connected to the direction detection device.

[0015] By adopting the above technical solution, the part of the ruler rolled up in the shell is prevented from rotating and the wires from getting tangled during the process of retracting and releasing, thereby improving the reliability of the internal circuit system.

[0016] Optionally, an external mounting structure is provided on one side of the instrument body, and a guide mounting structure cooperating with the external mounting structure is provided on the auxiliary lofting mechanism, and the auxiliary lofting mechanism is detachably connected to the instrument body through the guide mounting structure and the external mounting structure.

[0017] By adopting the above technical solution, the instrument body and the auxiliary lofting mechanism can be disassembled for easy storage and carrying, and when the prism is not needed for lofting operation, the instrument body can be installed without the auxiliary lofting mechanism to reduce the weight.

[0018] Optionally, the external installation structure includes a docking guide rail and a limit fastener, the guide installation structure is a guide block, and the guide block is provided with a guide groove for plugging and cooperating with the docking guide rail; the limit fastener is rotatably connected to the instrument body, and the guide block is provided with a limit slot. When the guide block is plugged into the docking guide rail through the guide groove, rotating the limit fastener can enable the limit fastener to be inserted into the limit slot.

[0019] By adopting the above technical solution, the connecting guide rail and the guide groove are slidably matched, and then locked by a limiting fastener, which makes the operation simple and convenient.

[0020] Optionally, a power supply contact is provided at the bottom of the docking rail, and the power supply contact is connected to the power supply system of the instrument body; a power connection contact is provided in the guide groove, and the power connection contact is connected to the power supply module; the power supply contact and the power connection contact both include positive and negative poles; when the guide block and the docking rail are plugged into place, the power supply contact and the power connection contact abut against each other, and the power supply circuit is turned on.

[0021] By adopting the above technical solution, after the auxiliary lofting mechanism is installed on the instrument body, it can be directly powered by the power supply of the instrument body, avoiding the situation where the auxiliary lofting mechanism is out of power when it is needed. In addition, the power supply contacts and the power contact can also be set to transmit electrical signals, so that the instrument body can also display the angle direction data of the prism to the commander, or match different external modules to realize other expansion functions.

[0022] Optionally, the winding and unwinding device includes a central shaft, a coil spring wound on the central shaft, a turntable and a rotating sleeve rotatably connected to the outside of the central shaft; the inner end of the coil spring is fixedly connected to the central shaft, and the outer end is fixedly connected to the turntable; the rotating sleeve and the turntable are linked by a planetary gear set, and the turntable is driven to rotate when the rotating sleeve rotates; the ruler is wound on the outside of the rotating sleeve, and the inner end of the ruler is fixedly connected to the rotating sleeve.

[0023] By adopting the above technical solution, when the ruler is pulled out, the inner rotating sleeve will be driven to rotate, and the rotating sleeve will drive the turntable to rotate through the planetary gear, and the turntable will drive the outer end of the coil spring to move, while the inner end of the coil spring is fixed to the center axis, so that the coil spring is curled and elastic potential energy is stored, generating a force in the winding direction of the ruler, so that the pulled out ruler can remain in a taut state and realize the function of automatic retraction of the ruler.

[0024] Optionally, a guide arm is provided at one end of the shell facing the front of the instrument body, and the front end of the guide arm extends to the front of the eyepiece of the instrument body; the guide arm is hollow and connected to the inner cavity of the shell, and the retractable opening is provided at the end of the guide arm.

[0025] By adopting the above technical solution, the guide arm is used to pull the ruler out from the front of the eyepiece, so that the rotation base point of the ruler is located on the axis of the eyepiece, which makes it easy for the prism holder to intuitively obtain the relative deviation angle of the prism.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: The direction detection device can be used to obtain the angular direction of the prism relative to the corresponding axis of the eyepiece of the total station, and the prism holder can use the display device to directly adjust the position according to the displayed data. The operation is highly accurate and does not require the commander to issue commands and communicate multiple times. It is fast and efficient and will not be affected by external factors such as distance and noise. The ruler can drive the rotating sleeve to rotate during the process of retraction and extension, and the rotation sensor is used to detect the number of revolutions of the rotating sleeve. The length of the ruler released can be obtained according to the corresponding formula and displayed to the prism holder on the display device; and when the commander gives the distance between the prism and the stakeout point, the prism holder can accurately move the required distance according to the length of the ruler retracted when moving forward, and can also adjust the direction in real time according to the data of the direction detection device when moving toward the total station, so as to achieve accurate and rapid arrival at the stakeout point. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the installation of the instrument body and the auxiliary lofting mechanism in the embodiment of the present application.

[0029] Figure 3 It is a schematic diagram of the exploded structure of the auxiliary lofting mechanism in the embodiment of the present application.

[0030] Figure 4 It is a schematic cross-sectional view of the guide arm in the embodiment of the present application.

[0031] Figure 5 It is a cross-sectional schematic diagram of the scale in the embodiment of the present application.

[0032] Figure 6 It is a schematic diagram of the structure of the scale, rotating sleeve and conductive slip ring in the embodiment of the present application.

[0033] Figure 7 yes Figure 1 A is an enlarged schematic diagram.

[0034] Description of reference numerals: 1. Tripod; 11. Mounting table; 12. Leveling knob; 2. Instrument body; 21. Telescope; 211. Eyepiece; 22. Rotating seat; 23. External mounting structure; 231. Connecting rail; 2311. Power supply contact; 232. Limit fastener; 2321. Limit hole; 233. Fixing piece; 2331. Embedded groove; 2332. Locking bolt; 24. Battery box; 3. Auxiliary lofting mechanism; 31. Shell; 311. Guide arm; 3111. Retractable opening; 3112. Guide roller; 312. Guide block; 3121. Guide groove; 3122. Limit groove; 3123. Power contact ; 3124, limit bolt; 32, reeling and winding device; 321, center axis; 322, coil spring; 323, turntable; 324, planetary gear set; 325, rotating sleeve; 33, ruler; 331, outer skin; 332, copper core; 333, positioning hole; 34, direction detection device; 341, swinging piece; 342, angle sensor; 343, limit port; 35, length detection device; 351, rotating sleeve; 352, rotating sensor; 353, positioning tooth; 36, clamping device; 361, display device; 37, conductive slip ring; 371, rotor terminal; 372, stator terminal. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-7 This application is described in further detail.

[0036] The present application embodiment discloses a high-precision total station. Figure 1 , Figure 2The high-precision total station includes a tripod 1, a mounting platform 11 disposed on the upper end of the tripod 1, and an instrument body 2 fixedly connected to the mounting platform 11. The mounting platform 11 is provided with three leveling buttons for adjusting the horizontal state of the instrument body 2. A telescope 21 is disposed on the instrument body 2, and a rotating seat 22 is provided at the bottom connected to the mounting platform 11. The rotating seat 22 enables the instrument body 2 to rotate and adjust the direction of the eyepiece 211 of the telescope 21, thereby realizing various measurement tasks.

[0037] Reference Figure 2 , Figure 3 The auxiliary sample-laying mechanism 3 is installed on one side of the instrument body 2 provided with the battery box 24, and the auxiliary sample-laying mechanism 3 can adjust the direction with the rotation of the instrument body 2. The auxiliary sample-laying mechanism 3 includes a shell 31, a strip-shaped scale 33 arranged in the shell 31, and a retracting and unreeling device 32 for controlling the retraction of the scale 33. A retracting and unreeling opening 3111 for releasing and retracting the outer end of the scale 33 is provided on the side of the shell 31 facing the front of the instrument body 2. A clamping device 36 is fixedly connected to the end of the outer side of the scale 33. The clamping device 36 can be a clamping claw, a clamp or a strap. In this embodiment, it is a clamp, which is used to fix the end of the scale 33 on the bracket of the prism.

[0038] The reeling and unreeling device 32 comprises a central shaft 321 fixedly connected to the housing 31, a coil spring 322 wound on the central shaft 321, a turntable 323 and a rotating sleeve 325 rotatably connected to the outside of the central shaft 321; the inner end of the coil spring 322 is fixedly connected to the central shaft 321, and the outer end is fixedly connected to the turntable 323, while the scale 33 is wound on the outside of the rotating sleeve 325, and the inner end of the scale 33 is fixedly connected to the rotating sleeve 325; the turntable 323 and the rotating sleeve 325 are arranged side by side along the axis of the central shaft 321, so that The scale 33 and the coil spring 322 are divided into two layers; the rotating sleeve 325 and the rotating disk 323 are linked by the planetary gear set 324, so that when the scale 33 is pulled out, the rotating sleeve 325 inside can be driven to rotate, and the rotating sleeve 325 drives the rotating disk 323 to rotate through the planetary gear. The rotation of the rotating disk 323 causes the coil spring 322 to curl and store elastic potential energy, generating a force in the winding direction on the scale 33, so that the pulled out scale 33 can be kept in a taut state, and the scale 33 can be automatically retracted. Among them, changing the gear ratio of the planetary gear can adjust the tension of the scale 33.

[0039] Reference Figure 2 , Figure 3A guide arm 311 is welded to one end of the shell 31 facing the front of the instrument body 2. The guide arm 311 is hollow and communicates with the inner cavity of the shell 31. The front end of the guide arm 311 extends to the front of the eyepiece 211 of the instrument body 2. The receiving opening 3111 is located at the end of the guide arm 311. The scale 33 extends outward through the receiving opening 3111, and a plurality of guide rollers 3112 for guiding the scale 33 are rotatably connected in the guide arm 311.

[0040] Reference Figure 3 , Figure 4 A direction detection device 34 for detecting the extension direction of the ruler 33 is provided at the retractable opening 3111, a length detection device 35 for detecting the extension length of the ruler 33 is provided in the guide arm 311, and a display device 361 is fixedly installed on the clamping device 36 at the end of the ruler 33. The display device 361 can receive the electrical signals transmitted by the direction detection device 34 and the length detection device 35 and display the direction and length data.

[0041] The direction detection device 34 includes a swinging member 341 rotatably connected to the receiving and releasing opening 3111, and an angle sensor 342 disposed in the swinging member 341; the seat of the angle sensor 342 is fixedly connected to the guide arm 311, and its rotation axis is fixedly connected to the swinging member 341. A limit opening 343 is formed on the swinging member 341 for the ruler 33 to pass through, and the limit opening 343 is in a flat mouth shape. When the ruler 33 passes through the limit opening 343, the swinging member 341 is driven to rotate in the extension direction of the ruler 33 itself. The extension direction of the ruler 33 is converted into the rotation angle of the swinging member 341, and then the rotation angle of the swinging member 341 is detected by the angle sensor 342. Compared with directly detecting the soft ruler 33, the data precision is higher and more accurate. The angle sensor 342 in this embodiment can be a potentiometer.

[0042] Reference Figure 3 , Figure 4 The length detection device 35 includes a rotation sensor 352 and a matching rotation sleeve 351. The rotation sleeve 351 is rotationally connected to the guide arm 311 and its axis is perpendicular to the displacement direction of the scale 33. The base of the rotation sensor 352 is fixedly connected to the guide arm 311, and its rotation axis is fixedly connected to the rotation sleeve 351. A circle of positioning teeth 353 is integrally formed on the rotation sleeve 351 along the circumferential direction. Positioning holes 333 for meshing with the positioning teeth 353 are evenly opened on the scale 33 along its own length direction, so that the scale 33 can drive the rotation sleeve 351 to rotate during the retraction and release process. The number of rotations of the rotation sleeve 351 is detected by the rotation sensor 352, and the length of the scale 33 released can be obtained according to a simple formula. In addition, a scale can be set on the surface of the scale 33 to facilitate the commander to read. The rotation sensor 352 in this embodiment can adopt a combination structure of a multi-turn potentiometer and a speed change gear.

[0043] Reference Figure 3 The display device 361 in this embodiment adopts a structure style that combines a pointer and a digital display (not specifically shown in the figure). The pointer points to the scale to display the deviation angle of the ruler 33 relative to the axis of the eyepiece 211, and the digital display reading shows the specific length of the ruler 33, which is convenient for the prism holder to check and judge the moving position by himself.

[0044] Reference Figure 5 , Figure 6 The scale 33 includes an outer skin 331 and a plurality of copper cores 332 disposed in the outer skin 331. The outer skin 331 is made of glass fiber and PVC plastic, and the copper cores 332 are in the shape of flexible threads or thin strips, and the copper cores 332 extend along the length direction of the scale 33. A conductive slip ring 37 is installed in the housing 31, the inner ring of the conductive slip ring 37 is fixedly connected to the central shaft 321 as a stator, and the outer ring is fixedly connected to the inner side of the rotating sleeve 325 as a rotor, and the rotor and the stator are respectively provided with a rotor terminal 371 and a stator terminal 372; the copper core 332 located at the outer end of the scale 33 is electrically connected to the display device 361, and the copper core 332 located at the inner end of the scale 33 is electrically connected to the rotor terminal 371, and the stator terminal 372 is electrically connected to the direction detection device 34 and the length detection device 35, so that a conductive loop is formed between the display device 361 and the direction detection device 34 and the length detection device 35, realizing the functions of electrical signal transmission and power supply. In this embodiment, the auxiliary lofting mechanism 3 is powered by the power supply of the instrument body 2 directly, and a battery built into the housing 31 can also be used as a power supply.

[0045] Reference Figure 2 , Figure 7 The instrument body 2 is provided with an external mounting structure 23, and the auxiliary lofting mechanism 3 is provided with a guide installation structure matched with the external mounting structure 23, and the auxiliary lofting mechanism 3 is detachably connected to the instrument body 2 through the guide installation structure and the external mounting structure 23. The external mounting structure 23 includes a docking guide rail 231 and a limit fastener 232 rotatably connected to the end of the docking guide rail 231; the guide installation structure is a guide block 312 integrally formed on the top of the shell 31, and a guide groove 3121 for plugging and matching with the docking guide rail 231 is formed on the guide block 312; the end of the limit fastener 232 protrudes in an L shape, and a limit groove 3122 is provided on the side of the upper end surface of the guide block 312 away from the guide groove 3121. When the guide block 312 is plugged with the docking guide rail 231 through the guide groove 3121, the limit fastener 232 flips downward to allow the protruding end to be inserted downward into the limit groove 3122, thereby realizing the locking function.

[0046] Reference Figure 2 , Figure 7The limiting fastener 232 is provided with a limiting hole 2321, and the guide block 312 is provided with a threaded hole, in which a limiting bolt 3124 is threadedly connected. Before the guide block 312 is plugged into the docking guide rail 231, the limiting bolt 3124 is first removed, and when the limiting fastener 232 is turned over to be inserted into the limiting groove 3122, the limiting hole 2321 and the threaded hole overlap up and down, and then the limiting bolt 3124 is passed through the limiting hole 2321 and screwed back into the threaded hole, and the limiting fastener 232 can be locked.

[0047] Reference Figure 2 , Figure 7 A power supply contact 2311 is provided at the bottom of the docking guide rail 231, and the power supply contact 2311 is connected to the power supply system of the instrument body 2; a power connection contact 3123 is provided in the guide groove 3121, and the power connection contact 3123 is connected to the power supply circuit in the shell; the power supply contact 2311 and the power connection contact 3123 both include positive and negative poles; when the guide block 312 and the docking guide rail 231 are plugged into place, the power supply contact 2311 and the power connection contact 3123 abut against each other, and the power supply circuit is turned on.

[0048] The implementation principle of a high-precision total station in the embodiment of the present application is: Before adjusting the prism for displacement, pull out the ruler 33 and connect the clamping device 36 at the end to the bracket of the prism to keep the ruler 33 straight, then synchronously move the position of the prism and the end of the ruler 33, and use the direction detection device 34 to obtain the angular direction of the prism relative to the corresponding axis of the eyepiece 211 of the total station; when the prism holder adjusts the direction position according to the data on the display device 361, the commander gives the distance between the prism and the layout point, and then the prism holder accurately moves the required distance according to the length of the ruler 33 retracted when moving forward on the display device 361, and can also adjust the direction in real time according to the data of the direction detection device 34 during the movement toward the total station, so as to achieve accurate and rapid arrival at the layout point. The entire layout step has high operating precision, does not require the commander to issue commands and communicate multiple times, is fast and efficient, and will not be affected by external factors such as distance and noise.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-precision total station, comprising a tripod (1) and an instrument body (2) arranged on the upper end of the tripod (1), characterized in that: The high-precision total station also includes an auxiliary layout mechanism (3) arranged on one side of the instrument body (2); the auxiliary layout mechanism (3) includes a shell (31), a strip-shaped scale (33) arranged in the shell (31), and a reeling and unreeling device (32) for controlling the retraction and unreeling of the scale (33); the shell (31) is provided with a reeling and unreeling opening (3111) for releasing and retracting one end of the scale (33); a direction detection device (34) for detecting the extension direction of the scale (33) is arranged at the reeling and unreeling opening (3111); a display device (361) is arranged at the end of the scale (33) extending outward, and the display device (361) is used to receive an electrical signal transmitted by the direction detection device (34) and display direction data; the auxiliary layout mechanism (3) also includes a power supply module for supplying power to the display device (361) and the direction detection device (34).

2. A high-precision total station according to claim 1, characterized in that: The direction detection device (34) comprises a swinging member (341) rotatably connected to the receiving and releasing opening (3111) and an angle sensor (342) arranged in the swinging member (341); the swinging member (341) is provided with a limit opening (343) for the ruler (33) to pass through, and when the ruler (33) passes through the limit opening (343), the swinging member (341) is driven to rotate in the extension direction of the ruler (33) itself.

3. A high-precision total station according to claim 1, characterized in that: A length detection device (35) is arranged in the housing (31), and the display device (361) is capable of receiving an electrical signal transmitted by the length detection device (35) and displaying length data; the length detection device (35) comprises a rotation sensor (352) and a matching rotation sleeve (351), the rotation sleeve (351) is rotatably connected in the guide arm (311) and the axis is perpendicular to the displacement direction of the scale (33); the rotation sleeve (351) is provided with positioning teeth (353) along the circumferential direction, and the scale (33) is evenly provided with positioning holes (333) for meshing with the positioning teeth (353) along its own length direction.

4. A high-precision total station according to claim 1, characterized in that: The scale (33) comprises an outer skin (331) and a plurality of copper cores (332) arranged in the outer skin (331); the copper cores (332) are in the form of flexible threads or thin strips, and the copper cores (332) extend along the length direction of the scale (33); the copper cores (332) are connected between a display device (361) and a direction detection device (34) to realize a conductive loop; and the power supply module supplies power to the display device (361) through the copper cores (332).

5. A high-precision total station according to claim 4, characterized in that: A conductive slip ring (37) is arranged in the housing (31), and the conductive slip ring (37) includes a rotor terminal (371) and a stator terminal (372). The inner copper core (332) of the scale (33) is electrically connected to the rotor terminal (371), and the stator terminal (372) is electrically connected to the direction detection device (34).

6. A high-precision total station according to claim 1, characterized in that: An external mounting structure (23) is provided on one side of the instrument body (2), and a guide mounting structure cooperating with the external mounting structure (23) is provided on the auxiliary lofting mechanism (3). The auxiliary lofting mechanism (3) is detachably connected to the instrument body (2) via the guide mounting structure and the external mounting structure (23).

7. A high-precision total station according to claim 6, characterized in that: The external mounting structure (23) comprises a docking guide rail (231) and a limiting fastener (232); the guide mounting structure is a guide block (312); the guide block (312) is provided with a guide groove (3121) for plugging and matching with the docking guide rail (231); the limiting fastener (232) is rotatably connected to the instrument body (2); the guide block (312) is provided with a limiting groove (3122); when the guide block (312) is plugged with the docking guide rail (231) through the guide groove (3121), the limiting fastener (232) can be rotated to allow the limiting fastener (232) to be inserted into the limiting groove (3122).

8. A high-precision total station according to claim 7, characterized in that: A power supply contact (2311) is arranged at the bottom of the docking guide rail (231), and the power supply contact (2311) is connected to the power supply system of the instrument body (2); a power connection contact (3123) is arranged in the guide groove (3121), and the power connection contact (3123) is connected to the power supply module; the power supply contact (2311) and the power connection contact (3123) both include positive and negative poles; when the guide block (312) and the docking guide rail (231) are plugged into place, the power supply contact (2311) and the power connection contact (3123) abut against each other, and the power supply circuit is turned on.

9. A high-precision total station according to claim 1, characterized in that: The reeling and unreeling device (32) comprises a central shaft (321), a coil spring (322) wound on the central shaft (321), a turntable (323) and a rotating sleeve (325) rotatably connected to the outside of the central shaft (321); the inner end of the coil spring (322) is fixedly connected to the central shaft (321), and the outer end is fixedly connected to the turntable (323); the rotating sleeve (325) and the turntable (323) are linked via a planetary gear set (324), and when the rotating sleeve (325) rotates, the turntable (323) is driven to rotate; the scale (33) is wound on the outside of the rotating sleeve (325), and the inner end of the scale (33) is fixedly connected to the rotating sleeve (325).

10. A high-precision total station according to claim 1, characterized in that: A guide arm (311) is provided at one end of the shell (31) facing the front of the instrument body (2), and the front end of the guide arm (311) extends to the front of the eyepiece (211) of the instrument body (2); the guide arm (311) is hollow and communicates with the inner cavity of the shell (31), and the retractable opening (3111) is provided at the end of the guide arm (311).

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