Small theodolite

Abstract

A small theodolite belongs to the technical field of optics and comprises a dovetail plate connecting seat, a foot stool connecting seat, a main plate A, an outer cover A, a rotating mechanism A, a main plate B, an outer cover B, a rotating mechanism B, an arc-shaped connecting plate, a locking handle A, a locking handle B, a locking handle C, a cover plate A and a cover plate B, the rotating mechanism A comprises a connecting shaft A, a turbine friction ring A, a turbine A, a double-eye nut A, a focusing hand wheel A and a worm A; and the rotating mechanism B comprises a connecting shaft B, a turbine friction ring B, a turbine B, a double-eye nut B, a focusing hand wheel B and a worm rod B. And the main plate A and the main plate B are fixedly connected through an arc-shaped connecting plate. A locking structure A is arranged on the right side of the main plate A, and a locking structure B is arranged above the connecting shaft B; the utility model has the beneficial effects of simplified structure, small volume and convenience in carrying and use.

Description

Technical Field

[0001] The utility model discloses a theodolite, in particular to a rotatable small telescope theodolite, belonging to the technical field of optics. Background Art

[0002] Usually, when an astronomical telescope is used for observation and tracking of celestial targets, it needs to be adjusted in both horizontal and vertical directions, and the angle cannot be adjusted timely and effectively. This does not conform to people's actual usage habits and cannot achieve the expected observation effect.

[0003] The utility model patent with publication number CN102207381B, application number 201110065677X and utility model name equatorial theodolite composite bracket discloses the following technical solution: it includes a base, an hour angle mechanism and a declination mechanism; the hour angle mechanism is connected to the base and can rotate around a latitude axis driven by a latitude adjustment mechanism; the declination mechanism is connected to the hour angle mechanism and can rotate around an hour angle axis driven by an hour angle driving mechanism; both ends of the declination mechanism are respectively connected to a lens barrel connecting seat, and the lens barrel connecting seat can rotate around a declination axis driven by the declination driving mechanism.

[0004] The above technical solutions have complex structures, large volumes, and are inconvenient to carry and use, and still cannot achieve the expected observation effect. Utility Model Content

[0005] The purpose of the utility model is to provide a small theodolite with simplified structure, small size, convenient carrying and use, and can achieve the purpose of achieving the expected observation effect in view of the defects of the prior art of the above-mentioned astronomical telescope theodolite, which has complex structure, large size, inconvenient carrying and use, and can not achieve the expected observation effect.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: a small theodolite, including a dovetail plate connecting seat and a tripod connecting seat, when in use, the upper end of the dovetail plate connecting seat is connected to the telescope, and the tripod connecting seat is connected to the tripod;

[0007] It also includes a main board A, an outer cover A, a rotating mechanism A, a main board B, an outer cover B, a rotating mechanism B and an arc-shaped connecting plate; the main board A is fixedly arranged on the left side of the outer cover A, and the rotating mechanism A is fixedly arranged in the outer cover A; the main board B is fixedly arranged above the outer cover B, and the rotating mechanism B is fixedly arranged in the outer cover B; the lower part of the outer cover A is fixedly connected to the upper end of the outer cover B;

[0008] The rotating mechanism A comprises a connecting shaft A, a turbine friction ring A, a turbine A, a double-eye nut A, a focusing hand wheel A and a worm rod A; the connecting shaft A is passed through the center of the dovetail plate connecting seat and is fixedly connected, the turbine friction ring A is tightly sleeved on the connecting shaft A, the turbine A is tightly sleeved on the turbine friction ring A, and the turbine A is fixedly connected to the connecting shaft A through the wheel friction ring A; the focusing hand wheel A is arranged on the left side of the front of the outer cover A, the double-eye nut A is fixedly connected to the focusing hand wheel A, and the focusing hand wheel A is fixedly connected to the worm rod A through the double-eye nut A; the worm rod A is also rotatably connected to the turbine A; when the focusing hand wheel A rotates, the worm rod A drives the turbine A to rotate, the turbine A drives the connecting shaft A to rotate, and the connecting shaft A drives the telescope to rotate through the dovetail plate connecting seat;

[0009] The rotating mechanism B comprises a connecting shaft B, a turbine friction ring B, a turbine B, a double-eye nut B, a focusing hand wheel B and a worm rod B; a connecting shaft hole is provided at the center of the tripod connecting seat, the connecting shaft B is inserted into the connecting shaft hole, and the tripod connecting seat is fixedly connected to the tripod through the connecting shaft B; the turbine friction ring B is tightly sleeved on the connecting shaft B, the turbine B is tightly sleeved on the turbine friction ring B, and the turbine B is fixedly connected to the connecting shaft B through the wheel friction ring B; the focusing hand wheel B is provided at the lower end of the front face of the outer cover B, the double-eye nut B is fixedly connected to the focusing hand wheel B, and the focusing hand wheel B is fixedly connected to the worm rod B through the double-eye nut B; the worm rod B is also rotationally connected to the turbine B; when the focusing hand wheel B rotates, the worm rod B drives the turbine B to rotate, and the turbine B drives the connecting shaft B and the tripod connecting seat to rotate; the tripod is also rotated through the tripod connecting seat;

[0010] Turning the focus handle A and the focus handle B at the same time can rotate the telescope in the horizontal and vertical directions at the same time.

[0011] The main board A and the main board B are perpendicular to each other, the arc-shaped connecting plate is arranged between the main board A and the main board B, and the main board A and the main board B are fixedly connected by the arc-shaped connecting plate.

[0012] A cylindrical connecting groove is arranged on the upper part of the dovetail plate connecting seat, and a threaded shaft neck is arranged on the upper end of the connecting shaft A. The diameter of the cylindrical connecting groove is larger than the threaded shaft neck of the connecting shaft A, and the connecting shaft neck is arranged at the center position of the connecting groove; a flat washer is arranged at the bottom of the connecting groove and is sleeved on the threaded shaft neck; a hexagonal nut is arranged on the threaded shaft neck, and the hexagonal nut is tightened downward to fasten the connecting shaft A and the dovetail plate connecting seat together; the hexagonal nut is an M10 hexagonal nut.

[0013] A large washer A is provided at the bottom of the inner groove of the dovetail plate connection seat, and the lower surface of the large washer A is in close contact with the upper end surface of the turbine friction ring A and the upper end surface of the turbine A;

[0014] A large washer B is provided at the bottom of the inner groove of the tripod connecting seat, and the lower surface of the large washer B is in close contact with the right end surface of the turbine friction ring B and the right end surface of the turbine B.

[0015] A locking structure A is arranged on the right side of the main board A, and the locking structure A comprises a flat washer A, a needle roller bearing A and a locking ring A. The flat washer A is arranged below the main board A and sleeved on the lower part of the connecting shaft A. The needle roller bearing A is arranged below the flat washer A and sleeved on the lower part of the connecting shaft A. The locking ring A is arranged below the needle roller bearing A and sleeved on the lower end of the connecting shaft A. The flat washer A and the needle roller bearing A are fixed to the main board A by the locking ring A.

[0016] A locking structure B is arranged above the connecting shaft B, and the locking structure B includes a flat washer B, a needle roller bearing B and a locking ring B. The flat washer B is on the left side of the main board B and is sleeved on the left part of the connecting shaft B. The needle roller bearing B is arranged on the left side of the flat washer B and is sleeved on the left part of the connecting shaft B. The locking ring B is arranged on the left side of the needle roller bearing B and is sleeved on the left end of the connecting shaft B. The flat washer B and the needle roller bearing B are fixed to the main board B by the locking ring B.

[0017] The left end face of the turbine friction ring A and the left end face of the turbine A are in the same plane and form plane A. A gasket A and a spacer A are arranged between plane A and the main board A. From right to left, they are plane A, gasket A, spacer A and main board A which are tightly connected to each other. The main board A and spacer A are tightened with screws.

[0018] The upper end surface of the turbine friction ring B and the upper end surface of the turbine B are in the same plane and form a plane B. A gasket B and a spacer B are arranged between the plane B and the main board B. From bottom to top, they are the plane B, gasket B, spacer B and main board B which are tightly connected to each other. The main board B and the spacer B are tightened with screws.

[0019] It also includes a locking handle A, a locking handle B and a locking handle C; the locking handle A is arranged at one side of the dovetail plate connecting seat, and is used to lock other accessories installed on the dovetail plate connecting seat; the locking handle B is arranged below the dovetail plate connecting seat, and is used to lock the dovetail plate connecting seat so that it does not move; the locking handle C is arranged at one side of the tripod connecting seat, and is used to lock the tripod connecting seat;

[0020] The locking handle A is an M6 locking handle A, the locking handle B is an M5 locking handle B, and the locking handle C is an M6 locking handle C.

[0021] It also includes a cover plate A and a cover plate B. The cover plate A is arranged above the locking ring A to protect the locking structure A; the cover plate B is arranged above the locking ring B to protect the locking structure B.

[0022] Compared with the prior art, the utility model has the advantages of simplified structure, small size, convenient carrying and use, and can achieve the expected observation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is: the front view of the utility model;

[0024] Figure 2 Yes: left view of the utility model;

[0025] Figure 3 yes: Figure 2 AA section view;

[0026] Figure 4 yes: Figure 3 A magnified view of part A;

[0027] Figure 5 yes: Figure 3 A magnified view of part B;

[0028] Figure 6 yes: Figure 3 Enlarged view of part C;

[0029] Figure 7 It is: a three-dimensional view of the dovetail plate connecting seat and the tripod connecting seat of the utility model;

[0030] Figure 8 It is: the three-dimensional view of the cover plate A and the cover plate B of the utility model.

[0031] Description of the accompanying drawings: dovetail plate connecting seat 1, connecting groove 101, threaded shaft neck 102, flat washer 103, hexagonal nut 104, large washer A 105, washer A 106, spacer A 107, tripod connecting seat 2, large washer B 201, washer B 202, spacer B203, main board A 3, outer cover A 4, rotating mechanism A 5, connecting shaft A 501, turbine friction ring A 502, turbine A 503, double-eye nut A 504, focusing hand wheel A 505, worm rod A 506, main board B 6, outer cover B 7, rotating mechanism B 8, connecting shaft B 801, turbine friction ring B 802, turbine B 803, double-eye nut B 804, focusing hand wheel B 805, worm rod B 806, arc connecting plate 9, locking structure A 10, flat washer A 1001, needle bearing A 1002, locking ring A 1003, locking structure B 11, flat washer B 1101, needle bearing B 1102, locking ring B 1103, locking handle A 12, locking handle B 13, locking handle C14, cover A15, cover B16. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The front, back, left and right directions described in the utility model are for the convenience of description and can actually be interchanged.

[0033] like Figures 1 to 8 As shown, a small theodolite, such as Figure 1 and Figure 2 As shown, it includes a dovetail plate connecting seat 1 and a tripod connecting seat 2. When in use, the upper end of the dovetail plate connecting seat 1 is connected to the telescope (not shown in the figure), and the tripod connecting seat 2 is connected to the tripod (not shown in the figure);

[0034] like Figure 1 and Figure 2 As shown, it also includes a main board A3, an outer cover A4, a rotating mechanism A5, a main board B6, an outer cover B7, a rotating mechanism B8 and an arc-shaped connecting plate 9; the main board A3 is fixedly arranged on the left side of the outer cover A4, and the rotating mechanism A5 is fixedly arranged in the outer cover A4; the main board B6 is fixedly arranged above the outer cover B7, and the rotating mechanism B8 is fixedly arranged in the outer cover B7; the lower part of the outer cover A4 is fixedly connected to the upper end of the outer cover B7;

[0035] like Figure 3 , Figure 5 and Figure 6 As shown, the rotating mechanism A5 includes a connecting shaft A501, a turbine friction ring A502, a turbine A503, a double-eye nut A504, a focusing hand wheel A505 and a worm rod A506; the connecting shaft A501 is passed through the center of the dovetail plate connecting seat 1 and is fixedly connected, the turbine friction ring A502 is tightly sleeved on the connecting shaft A501, the turbine A503 is tightly sleeved on the turbine friction ring A502, and the turbine A503 is fixedly connected to the connecting shaft A501 through the wheel friction ring A; the focusing hand wheel A505 is arranged on the left side of the front face of the outer cover A4, the double-eye nut A504 is fixedly connected to the focusing hand wheel A505, and the focusing hand wheel A505 is fixedly connected to the worm rod A506 through the double-eye nut A504; the worm rod A506 is rotationally connected to the turbine A503; the focusing hand wheel A505 is fixedly connected to the focusing hand wheel A505. When 505 rotates, the turbine A 503 is driven to rotate through the worm rod A 506, and the turbine A 503 drives the connecting shaft A 501 to rotate, and the connecting shaft A 501 drives the telescope to rotate through the dovetail plate connecting seat 1;

[0036] like Figure 3 , Figure 5 and Figure 6 As shown, the rotating mechanism B8 includes a connecting shaft B801, a turbine friction ring B802, a turbine B803, a double-eye nut B804, a focusing hand wheel B805 and a worm rod B806; a connecting shaft hole is provided at the center of the tripod connecting seat 2, the connecting shaft B801 is inserted into the connecting shaft hole, and the tripod connecting seat 2 is fixedly connected to the tripod through the connecting shaft B801; the turbine friction ring B802 is tightly sleeved on the connecting shaft B801, the turbine B803 is tightly sleeved on the turbine friction ring B802, and the turbine B803 is fixedly connected to the connecting shaft B801 through the wheel friction ring B; the focusing hand wheel B805 is provided at the lower end of the front face of the outer cover B7, the double-eye nut B804 is fixedly connected to the focusing hand wheel B805, and the focusing hand wheel B805 is connected to the worm rod B806 through the double-eye nut B804. 806 is fixedly connected; the worm rod B 806 is rotatably connected to the turbine B 803; when the focusing hand wheel B 805 rotates, the worm rod B 806 drives the turbine B 803 to rotate, and the turbine B 803 drives the connecting shaft B 801 and the tripod connecting seat 2 to rotate; the tripod is rotated through the tripod connecting seat 2;

[0037] Turning the focus hand wheel A 505 and the focus hand wheel B 805 simultaneously can turn the telescope in the horizontal direction and the vertical direction at the same time.

[0038] like Figure 1 As shown, the main board A 3 and the main board B 6 are perpendicular to each other, and the arc-shaped connecting plate 9 is arranged between the main board A 3 and the main board B 6, and the main board A 3 and the main board B 6 are fixedly connected by the arc-shaped connecting plate 9.

[0039] like Figure 3 and Figure 4 As shown, a cylindrical connecting groove 101 is provided on the upper part of the dovetail plate connecting seat 1, and a threaded shaft neck 102 is provided on the upper end of the connecting shaft A 501. The diameter of the cylindrical connecting groove 101 is larger than the threaded shaft neck 102 of the connecting shaft A 501, and the connecting shaft neck is arranged at the center position of the connecting groove 101; a flat washer 103 sleeved on the threaded shaft neck 102 is provided at the bottom of the connecting groove 101; a hexagonal nut 104 is provided on the threaded shaft neck 102, and the hexagonal nut 104 is tightened downward to fasten the connecting shaft A 501 and the dovetail plate connecting seat 1 together; the hexagonal nut 104 is an M10 hexagonal nut 104.

[0040] like Figure 3 and 4As shown, a large washer A 106105 is provided at the bottom of the inner groove of the dovetail plate connecting seat 1, and the lower surface of the large washer A 106105 is in close contact with the upper end surface of the turbine friction ring A 502 and the upper end surface of the turbine A 503;

[0041] like Figure 4 As shown, a large washer B202 201 is provided at the bottom of the inner groove of the tripod connecting seat 2, and the lower surface of the large washer B202 201 is in close contact with the right end surface of the turbine friction ring B 802 and the right end surface of the turbine B 803.

[0042] like Figure 3 and 5 As shown, a locking structure A10 is provided on the right side of the main board A3, and the locking structure A10 includes a flat washer A1001, a needle bearing A1002 and a locking ring A1003. The flat washer A1001 is below the main board A3 and is sleeved on the lower part of the connecting shaft A501. The needle bearing A1002 is provided below the flat washer A1001 and is sleeved on the lower part of the connecting shaft A501. The locking ring A1003 is provided below the needle bearing A1002 and is sleeved on the lower end of the connecting shaft A501. The flat washer A1001 and the needle bearing A1002 are fixed to the main board A3 by the locking ring A1003.

[0043] like Figure 3 and 6 As shown, a locking structure B11 is provided above the connecting shaft B801, and the locking structure B11 includes a flat washer B1101, a needle bearing B1102 and a locking ring B1103. The flat washer B1101 is on the left side of the main board B6 and is sleeved on the left part of the connecting shaft B801. The needle bearing B1102 is provided on the left side of the flat washer B1101 and is sleeved on the left part of the connecting shaft B801. The locking ring B1103 is provided on the left side of the needle bearing B1102 and is sleeved on the left end of the connecting shaft B801. The flat washer B1101 and the needle bearing B1102 are fixed to the main board B6 by the locking ring B1103.

[0044] like Figure 3 , Figure 5 and Figure 8 As shown, the left side of the turbine friction ring A 502 and the left side of the turbine A 503 are in the same plane and constitute plane A. A gasket A 106 and a spacer A 107 are provided between plane A and the main board A 3. From right to left, plane A, gasket A 106, spacer A 107 and main board A 3 are tightly connected to each other, and screws are used to tighten the main board A 3 and the spacer A 107.

[0045] like Figure 3, Figure 6 and Figure 8 As shown, the upper end surface of the turbine friction ring B 802 and the upper end surface of the turbine B 803 are in the same plane and constitute plane B. A gasket B202 and a spacer B203 are provided between plane B and the main board B6. From bottom to top, plane B, gasket B202, spacer B203 and main board B6 are tightly connected to each other, and screws are used to tighten the main board B6 and the spacer B203.

[0046] like Figure 3 and Figure 7 As shown, it also includes a locking handle A12, a locking handle B13 and a locking handle C14; the locking handle A12 is arranged at one side of the dovetail plate connecting seat 1, and is used to lock other accessories installed on the dovetail plate connecting seat 1; the locking handle B13 is arranged below the dovetail plate connecting seat 1, and is used to lock the dovetail plate connecting seat 1 so that it does not move; the locking handle C14 is arranged at one side of the tripod connecting seat 2, and is used to lock the tripod connecting seat 2;

[0047] The locking handle A12 is an M6 locking handle A12, the locking handle B13 is an M5 locking handle B13, and the locking handle C14 is an M6 locking handle C14.

[0048] like Figure 8 As shown, it also includes a cover plate A15 and a cover plate B16. The cover plate A15 is arranged above the locking ring A1003 to protect the locking structure A10; the cover plate B16 is arranged above the locking ring B1103 to protect the locking structure B11.

[0049] The embodiments described above are only preferred implementations of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A small theodolite, comprising a dovetail plate connection seat and a tripod connection seat, wherein when in use, the upper end of the dovetail plate connection seat is connected to a telescope, and the tripod connection seat is connected to a tripod, characterized in that: It also includes a main board A, an outer cover A, a rotating mechanism A, a main board B, an outer cover B, a rotating mechanism B and an arc-shaped connecting plate; the main board A is fixedly arranged on the left side of the outer cover A, and the rotating mechanism A is fixedly arranged in the outer cover A; the main board B is fixedly arranged above the outer cover B, and the rotating mechanism B is fixedly arranged in the outer cover B; the lower part of the outer cover A is fixedly connected to the upper end of the outer cover B; The rotating mechanism A comprises a connecting shaft A, a turbine friction ring A, a turbine A, a double-eye nut A, a focusing hand wheel A and a worm rod A; the connecting shaft A is passed through the center of the dovetail plate connecting seat and is fixedly connected, the turbine friction ring A is tightly sleeved on the connecting shaft A, the turbine A is tightly sleeved on the turbine friction ring A, and the turbine A is fixedly connected to the connecting shaft A through the wheel friction ring A; the focusing hand wheel A is arranged on the left side of the front of the outer cover A, the double-eye nut A is fixedly connected to the focusing hand wheel A, and the focusing hand wheel A is fixedly connected to the worm rod A through the double-eye nut A; the worm rod A is also rotatably connected to the turbine A; when the focusing hand wheel A rotates, the worm rod A drives the turbine A to rotate, the turbine A drives the connecting shaft A to rotate, and the connecting shaft A drives the telescope to rotate through the dovetail plate connecting seat; The rotating mechanism B comprises a connecting shaft B, a turbine friction ring B, a turbine B, a double-eye nut B, a focusing hand wheel B and a worm rod B; a connecting shaft hole is provided at the center of the tripod connecting seat, the connecting shaft B is inserted into the connecting shaft hole, and the tripod connecting seat is fixedly connected to the tripod through the connecting shaft B; the turbine friction ring B is tightly sleeved on the connecting shaft B, the turbine B is tightly sleeved on the turbine friction ring B, and the turbine B is fixedly connected to the connecting shaft B through the wheel friction ring B; the focusing hand wheel B is provided at the lower end of the front face of the outer cover B, the double-eye nut B is fixedly connected to the focusing hand wheel B, and the focusing hand wheel B is fixedly connected to the worm rod B through the double-eye nut B; the worm rod B is also rotationally connected to the turbine B; when the focusing hand wheel B rotates, the worm rod B drives the turbine B to rotate, and the turbine B drives the connecting shaft B and the tripod connecting seat to rotate; the tripod is also rotated through the tripod connecting seat; Turning the focusing hand wheel A and the focusing hand wheel B at the same time means turning the telescope in the horizontal and vertical directions at the same time.

2. A small theodolite according to claim 1, characterized in that: The main board A and the main board B are perpendicular to each other, the arc-shaped connecting plate is arranged between the main board A and the main board B, and the main board A and the main board B are fixedly connected by the arc-shaped connecting plate.

3. A small theodolite according to claim 1, characterized in that: A cylindrical connecting groove is arranged on the upper part of the dovetail plate connecting seat, and a threaded shaft neck is arranged on the upper end of the connecting shaft A. The diameter of the cylindrical connecting groove is larger than the threaded shaft neck of the connecting shaft A, and the connecting shaft neck is arranged at the center position of the connecting groove; a flat washer is arranged at the bottom of the connecting groove and is sleeved on the threaded shaft neck; a hexagonal nut is arranged on the threaded shaft neck, and the hexagonal nut is tightened downward to fasten the connecting shaft A and the dovetail plate connecting seat together; the hexagonal nut is an M10 hexagonal nut.

4. A small theodolite according to claim 1, characterized in that: A large washer A is provided at the bottom of the inner groove of the dovetail plate connection seat, and the lower surface of the large washer A is in close contact with the upper end surface of the turbine friction ring A and the upper end surface of the turbine A; A large washer B is provided at the bottom of the inner groove of the tripod connecting seat, and the lower surface of the large washer B is in close contact with the right end surface of the turbine friction ring B and the right end surface of the turbine B.

5. A small theodolite according to claim 1, characterized in that: A locking structure A is arranged on the right side of the main board A, and the locking structure A comprises a flat washer A, a needle roller bearing A and a locking ring A. The flat washer A is arranged below the main board A and sleeved on the lower part of the connecting shaft A. The needle roller bearing A is arranged below the flat washer A and sleeved on the lower part of the connecting shaft A. The locking ring A is arranged below the needle roller bearing A and sleeved on the lower end of the connecting shaft A. The flat washer A and the needle roller bearing A are fixed to the main board A by the locking ring A.

6. A small theodolite according to claim 1, characterized in that: A locking structure B is arranged above the connecting shaft B, and the locking structure B includes a flat washer B, a needle roller bearing B and a locking ring B. The flat washer B is on the left side of the main board B and is sleeved on the left part of the connecting shaft B. The needle roller bearing B is arranged on the left side of the flat washer B and is sleeved on the left part of the connecting shaft B. The locking ring B is arranged on the left side of the needle roller bearing B and is sleeved on the left end of the connecting shaft B. The flat washer B and the needle roller bearing B are fixed to the main board B by the locking ring B.

7. A small theodolite according to claim 1, characterized in that: The left end face of the turbine friction ring A and the left end face of the turbine A are in the same plane and form plane A. A gasket A and a spacer A are arranged between plane A and the main board A. From right to left, they are plane A, gasket A, spacer A and main board A which are tightly connected to each other. The main board A and spacer A are tightened with screws.

8. A small theodolite according to claim 1, characterized in that: The upper end surface of the turbine friction ring B and the upper end surface of the turbine B are in the same plane and form a plane B. A gasket B and a spacer B are arranged between the plane B and the main board B. From bottom to top, they are the plane B, gasket B, spacer B and main board B which are tightly connected to each other. The main board B and the spacer B are tightened with screws.

9. A small theodolite according to claim 1, characterized in that: It also includes a locking handle A, a locking handle B and a locking handle C; the locking handle A is arranged at one side of the dovetail plate connecting seat, and is used to lock other accessories on the dovetail plate connecting seat; the locking handle B is arranged below the dovetail plate connecting seat, and is used to lock the dovetail plate connecting seat so that it does not move; the locking handle C is arranged at one side of the tripod connecting seat, and is used to lock the tripod connecting seat; The locking handle A is an M6 locking handle A, the locking handle B is an M5 locking handle B, and the locking handle C is an M6 locking handle C.

10. A small theodolite according to claim 1, characterized in that: It also includes a cover plate A and a cover plate B. The cover plate A is arranged above the locking ring A to protect the locking structure A; the cover plate B is arranged above the locking ring B to protect the locking structure B.

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