Theodolite convenient to carry

Abstract

The utility model relates to a portable theodolite which comprises a base, a theodolite body is arranged on the upper surface of the base, a stand column and three supporting columns are arranged on the lower surface of the base, a suction cup is arranged on the bottom face of each supporting column, the suction face of each suction cup faces the ground, a containing groove is formed in each supporting column, and an air cylinder is arranged in each containing groove. The stand column is provided with a driving assembly for driving the piston rods to reciprocate in the length direction of the air cylinders, the driving assembly drives the three piston rods to synchronously move towards the base, and air in the air cylinders and the suction holes is pumped out by the piston rods. A negative pressure state is formed in the suction hole, and the suction cup is tightly sucked on the ground under the action of atmospheric pressure, so that the supporting stability of the supporting column is improved, and the possibility of shaking when the supporting column is collided by external force during measurement is reduced. The method has the effect of improving the stability of the theodolite during measurement.

Description

Technical Field

[0001] This application relates to the technical field of theodolites, and particularly to a portable theodolite. Background Art

[0002] A theodolite is a measuring instrument designed based on the principle of angle measurement for measuring horizontal angles and vertical angles, and is widely used in fields such as construction, engineering, and surveying. During measurement, the theodolite is placed on a tripod, and the instrument center is aligned with the ground measurement point using a plumb bob or an optical plummet. The instrument is leveled using a level, and the measuring target is aimed at using a telescope. The horizontal angle and vertical angle are measured using a horizontal dial and a vertical dial.

[0003] A theodolite is a precision instrument, so the stability requirements for the placed tripod are relatively high. In the prior art, tripods usually only have anti-slip pads at the bottom of the legs to increase the friction between the tripod and the ground. However, if there is an external collision, the existing tripods lack stability and are prone to shaking and other situations, reducing the stability of the theodolite during measurement, and there are obvious deficiencies. Utility Model Content

[0004] In order to improve the stability of the theodolite during measurement, this application provides a portable theodolite.

[0005] A portable theodolite provided by this application adopts the following technical solution:

[0006] A portable theodolite includes a base. The upper surface of the base is provided with a theodolite body. The lower surface of the base is provided with a column and three support columns. The column is arranged at the center of the base. The bottom surface of each support column is provided with a suction cup, and the adsorption surface of the suction cup faces the ground. A receiving groove is formed in the support column, and an air cylinder is arranged in the receiving groove. The suction cup is provided with a suction hole communicating with the inside of the air cylinder. A piston rod is slidably connected inside the air cylinder, and a driving assembly for driving the piston rod to reciprocate along the length direction of the air cylinder is arranged on the column.

[0007] By adopting the above technical solution, during measurement, the theodolite body is installed on the base, and then the three piston rods are driven by the driving assembly to move synchronously towards the base. The air in the air cylinder and the suction hole is pumped out by the piston rod, and a negative pressure state is formed in the suction hole. The suction cup is tightly sucked on the ground under the action of atmospheric pressure. The support stability of the support column is improved under the adsorption of the three suction cups, so that the possibility of shaking when being subjected to an external collision during measurement is reduced, and further the stability of the theodolite during measurement is improved.

[0008] Optionally, a cavity is formed inside the upright column. The driving assembly includes a screw rod rotatably arranged inside the cavity. A nut block is threadedly connected to the screw rod. The outer surface of the nut block is hinged with driving rods corresponding to the three piston rods one by one. One end of the driving rod away from the nut block is hinged to the piston rod. Guide grooves for slidingly cooperating with the driving rods are formed in the support column and the upright column. A rotating assembly for driving the screw rod to rotate is arranged on the upright column.

[0009] By adopting the above technical solution, when it is necessary to fix the base, the rotating assembly drives the screw rod to rotate forward. During the forward rotation of the screw rod, the nut block moves along the screw rod towards the base. The movement of the nut block drives the whole driving rod to move towards the base, and the movement of the driving rod drives the piston rod to move, so as to realize the air extraction of the air cylinder. When it is necessary to release the fixation, the driving assembly drives the piston rod to move towards the direction of the suction cup. When moving, gas is re-introduced into the air cylinder and the suction holes. As the gas is introduced, the pressure difference inside and outside the suction cup gradually decreases, and the adsorption force of the suction cup on the ground gradually decreases, thus facilitating the measurement worker to move the theodolite body.

[0010] Optionally, a rotating groove is formed on the outer side wall of the upright column. The rotating assembly includes a rotating shaft rotatably connected in the rotating groove. One end of the rotating shaft extends into the cavity and is fixedly connected with a main bevel gear. A secondary bevel gear meshing with the main bevel gear is fixedly connected to the screw rod. The main bevel gear and the secondary bevel gear are both rotatably arranged inside the cavity. A limiting assembly for limiting the rotation of the rotating shaft is arranged on the rotating shaft.

[0011] By adopting the above technical solution, when it is necessary to rotate the screw rod, the worker rotates the rotating shaft. The rotation of the rotating shaft drives the main bevel gear to rotate. The main bevel gear drives the meshing secondary bevel gear to rotate. The secondary bevel gear drives the screw rod to rotate. After the suction cup adsorbs on the ground, the limiting assembly limits the rotation of the rotating shaft. The rotation of the rotating shaft is prevented, so that the position of the nut block on the screw rod is fixed, and thus the negative pressure state inside the suction hole is fixed, avoiding the occurrence of the phenomenon that the rotating shaft rotates due to the accidental touch of the tester, and further improving the stability of the theodolite during the measurement process.

[0012] Optionally, the limiting assembly includes a limiting block sleeved on the outer surface of the rotating shaft. A sliding block is arranged on the limiting block. A sliding groove for slidingly cooperating with the sliding block is formed on the surface of the rotating shaft. A limiting groove is formed on the inner side wall of the rotating groove. The limiting block is slidably arranged in the limiting groove. A second spring is arranged in the limiting groove. One end of the second spring is connected to the inner side wall of the limiting groove, and the other end is connected to the limiting block. In the natural state of the second spring, the limiting block is embedded inside the limiting groove.

[0013] By adopting the above technical solution, when it is necessary to rotate the rotating shaft, the worker pulls the limiting block outwards until the limiting block disengages from the limiting groove. At this time, the second spring is stretched, and the rotating shaft can be rotated. After the suction cup is firmly adsorbed on the ground, the worker cancels the force on the limiting block, the pulling force on the second spring disappears, the second spring resets and pulls the limiting block to re-embed into the limiting groove. At this time, the limiting block cannot rotate in the limiting groove, and at the same time, under the limitation of the sliding groove and the slider, the rotating shaft cannot rotate either, so that the position of the nut block on the screw rod is fixed.

[0014] Optionally, an installation cylinder is arranged on the bottom surface of the nut block. An installation ring plate is arranged at one end of the installation cylinder away from the nut block. The installation ring plate is slidably connected in the cavity. A plurality of rollers are arranged on the installation ring plate. When the nut block moves to the bottom end of the threaded section of the screw rod, the rollers abut against the ground.

[0015] By adopting the above technical solution, during the process of the nut block moving towards the ground, the adsorption force of the suction cup gradually disappears. At the same time, the nut block drives the installation cylinder to move downwards, and the installation cylinder drives the installation ring plate to move. When the nut block moves to the bottom end of the threaded section of the screw rod, the rollers abut against the ground. Under the rolling action of the rollers, the worker can move the theodolite body by pushing the column, saving manpower. When it is necessary to fix again, during the process of the nut block moving towards the base, the nut block drives the rollers to move into the cavity through the installation cylinder, the rollers disengage from the bottom surface, and at the same time, the suction cup is adsorbed and fixed on the ground, so as to realize the fixation of the base.

[0016] Optionally, a connection disk is arranged on the surface of the base, and a connection component is arranged on the bottom surface of the theodolite body. The theodolite body is detachably connected to the connection disk through the connection component.

[0017] By adopting the above technical solution, the setting of the connection disk and the connection component realizes the detachable connection between the theodolite body and the base, which is convenient for the worker to separate the base and the theodolite body when not measuring. At the same time, the worker can replace different theodolite bodies according to the test requirements, improving the convenience of measurement for the surveyor.

[0018] Optionally, the connecting component includes a plug post arranged on the theodolite body. A slot is formed in the connecting plate and is in sliding fit with the plug post. Fixed blocks are arranged at both opposite ends of the plug post. Fixed slots are formed in the inner side wall of the slot and are in sliding fit with the fixed blocks. An arc-shaped slot communicating with the fixed slot is formed in the inner peripheral bottom wall of the slot. A first spring is arranged on the inner bottom wall of the slot. One end of the first spring is connected with a pressing plate. One end of the pressing plate is inserted into the arc-shaped slot and is in sliding fit with the arc-shaped slot. A clamping groove for inserting the fixed block is formed in the side wall of the arc-shaped slot. In the natural state of the first spring, the fixed block is pressed by the pressing plate and clamped in the clamping groove.

[0019] By adopting the above technical solution, when the theodolite body needs to be installed, the worker inserts the plug post into the slot. When the bottom surface of the plug post contacts the surface of the pressing plate, the worker presses the plug post downward. At this time, the first spring is compressed, and the fixed block moves from the fixed slot to the arc-shaped slot. The worker rotates the plug post to make the fixed block slide from the arc-shaped slot to the communicating position with the clamping groove of the arc-shaped slot. Then the worker cancels the downward force on the plug post. The first spring resets and drives the pressing plate to reset. The pressing plate presses the slider in the clamping groove. Under the restriction of the clamping groove, the plug post cannot rotate in the slot, thus realizing the installation of the theodolite on the base. Such a setting realizes the detachable connection between the theodolite body and the base.

[0020] Optionally, a rubber pad is arranged on the surface of the column near the bottom surface.

[0021] By adopting the above technical solution, the setting of the rubber pad increases the friction between the bottom surface of the column and the ground, thereby further improving the stability of the theodolite during measurement.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. By arranging a suction cup, an air cylinder, a piston rod and a driving component in the present application, the driving component drives the piston rod to pump air inside the air cylinder. The air in the suction cup is pumped out by the piston rod, and a negative pressure state is formed in the suction hole. The suction cup is tightly sucked on the ground under the action of atmospheric pressure, improving the support stability of the support column, thereby reducing the possibility of shaking when being collided by an external force during measurement, and further improving the stability of the theodolite during measurement;

[0024] 2. By arranging a rotating component and a limiting component in the present application, the limiting component restricts the rotation of the rotating shaft. The rotation of the rotating shaft is restricted, so that the position of the nut block on the screw rod is fixed, thereby fixing the negative pressure state inside the suction hole and avoiding the occurrence of the phenomenon that the rotating shaft rotates due to the accidental touch of the tester, further improving the stability of the theodolite during the measurement process;

[0025] 3. By providing a connection plate and a connection component, the detachable connection between the theodolite body and the base is achieved. This facilitates the separation of the base and the theodolite body by workers when not in use, and at the same time, workers can replace different theodolite bodies according to test requirements, improving the convenience of measurement for surveyors. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the present application.

[0027] Figure 2 is a sectional view of the insertion post and the connection plate in an embodiment of the present application.

[0028] Figure 3 is a sectional view of the upright column and the support column in an embodiment of the present application.

[0029] Figure 4 is a sectional view of the upright column in an embodiment of the present application.

[0030] Figure 5 is the present application Figure 3 magnified view of part A.

[0031] Description of the reference numerals: 01, theodolite body; 1, base; 2, connection plate; 21, slot; 22, fixing groove; 23, arc groove; 24, clamping groove; 3, connection component; 31, insertion post; 32, fixing block; 33, first spring; 34, pressing plate; 4, upright column; 41, rubber pad; 42, cavity; 5, support column; 51, receiving groove; 6, suction cup; 61, suction hole; 7, air cylinder; 71, piston rod; 8, driving component; 81, screw; 82, nut block; 83, driving rod; 9, rotating component; 91, rotating shaft; 911, sliding groove; 92, main bevel gear; 93, sub-bevel gear; 10, rotating groove; 101, limiting groove; 11, limiting component; 111, limiting block; 112, slider; 113, second spring; 12, mounting cylinder; 121, mounting ring plate; 122, roller. Detailed Description of the Embodiment

[0032] The following further elaborates on the present application in conjunction with the attached Figures 1 - 5 drawings.

[0033] An embodiment of the present application discloses a portable theodolite.

[0034] Refer to Figure 1 and Figure 2, A portable theodolite includes a base 1 and a theodolite body 01. A connecting plate 2 is fixedly connected to the upper surface of the base 1. A connecting component 3 is provided on the bottom surface of the theodolite body 01. The theodolite body 01 is detachably connected to the upper surface of the base 1 through the connecting component 3. A column 4 and three support columns 5 are fixedly connected to the lower surface of the base 1. The column 4 is arranged at the center of the base 1. The three support columns 5 are circumferentially and equidistantly distributed on the base 1. One ends of the column 4 and the support columns 5 away from the base 1 are both abutted against the ground. A rubber pad 41 is fixedly connected to the surface of the column 4 close to the ground to increase the friction between the column 4 and the ground.

[0035] Refer to Figure 1 and Figure 2 , The connecting component 3 includes a plug post 31 fixedly connected to the theodolite body 01. A slot 21 slidably matched with the plug post 31 is formed on the connecting plate 2. Fixed blocks 32 are fixedly connected to two opposite end faces of the plug post 31. Fixed grooves 22 for the two fixed blocks 32 to slide are formed on the opposite inner side walls of the slot 21. Arc-shaped grooves 23 corresponding to and communicating with the two fixed grooves 22 are formed on the inner circumferential side wall of the slot 21. A first spring 33 is arranged in the slot 21. One end of the first spring 33 is connected to the inner bottom wall of the slot 21, and the other end is connected to a pressing plate 34. The pressing plate 34 includes an integrally formed circular bottom plate and two arc-shaped plugging plates. The arc-shaped plugging plates are inserted into the corresponding arc-shaped grooves 23 and are slidably matched with the arc-shaped grooves 23. Clamping grooves 24 for clamping and cooperating with the two sliders 112 are formed on the inner side walls of the two arc-shaped grooves 23. In the natural state of the first spring 33, the two sliders 112 are pressed tightly in the clamping grooves 24 by the pressing plate 34.

[0036] When it is necessary to install the theodolite body 01, the worker inserts the plug post 31 into the slot 21. When the bottom surface of the plug post 31 contacts the surface of the pressing plate 34, the worker presses the plug post 31 downward. At this time, the first spring 33 is compressed, and the fixed block 32 moves from the fixed groove 22 to the arc-shaped groove 23. The worker rotates the plug post 31 to make the fixed block 32 slide from the arc-shaped groove 23 to the communicating part with the clamping groove 24 of the arc-shaped groove 23. Then the worker cancels the downward acting force on the plug post 31. The first spring 33 resets to drive the pressing plate 34 to reset. The pressing plate 34 presses the slider 112 tightly in the clamping groove 24. Under the restriction of the clamping groove 24, the plug post 31 cannot rotate in the slot 21, thus realizing the installation of the theodolite on the base 1. Such a setting realizes the detachable connection between the theodolite body 01 and the base 1, which is convenient for the worker to separate the base 1 and the theodolite body 01 when not measuring. At the same time, the worker can replace different theodolite bodies 01 according to the test requirements, improving the convenience of measurement for the surveyor.

[0037] Refer to Figure 1 and Figure 3, a suction cup 6 is fixedly installed on the bottom surface of each support column 5, the adsorption surface of the suction cup 6 faces the ground, a receiving groove 51 is formed in each support column 5 along the length direction, an air cylinder 7 is fixedly installed in the receiving groove 51, a suction hole 61 communicating with the inside of the air cylinder 7 is formed in the suction cup 6, a piston rod 71 is slidably connected to the inside of each air cylinder 7, and a driving assembly 8 for driving the three piston rods 71 to reciprocate synchronously along the length direction of the air cylinder 7 is arranged on the column 4.

[0038] Referring to Figure 1 and Figure 3 , a cavity 42 is formed inside the column 4. The driving assembly 8 includes a screw rod 81 rotatably arranged inside the cavity 42. A nut block 82 is threadedly connected to the screw rod 81. Driving rods 83 corresponding to the three piston rods 71 one by one are hinged on the outer peripheral surface of the nut block 82. One end of the driving rod 83 far from the nut block 82 is hinged on the piston rod 71. Guide grooves for the driving rods 83 to slide are formed on the support column 5 and the column 4. A rotating assembly 9 for driving the screw rod 81 to rotate is arranged on the column 4.

[0039] Referring to Figure 3 , Figure 4 and Figure 5 , a rotating groove 10 communicating with the inside of the cavity 42 is formed on the outer side wall of the column 4 close to the base 1. A rotating shaft 91 is rotatably connected in the rotating groove 10. One end of the rotating shaft 91 is fixedly connected with a handle, and the other end extends into the cavity 42 and is fixedly connected with a main bevel gear 92. One end of the screw rod 81 close to the base 1 is fixedly connected with a sub-bevel gear 93 meshing with the main bevel gear 92. The main bevel gear 92 and the sub-bevel gear 93 are both rotatably arranged inside the cavity 42.

[0040] After the theodolite body 01 is installed, the surveying worker holds the handle and rotates the rotating shaft 91 forward. The rotation of the rotating shaft 91 drives the main bevel gear 92 to rotate. The main bevel gear 92 drives the engaged sub-bevel gear 93 to rotate. The sub-bevel gear 93 drives the screw rod 81 to rotate. During the forward rotation of the screw rod 81, the nut block 82 moves along the screw rod 81 towards the base 1. The nut block 82 drives the whole driving rod 83 to move towards the base 1. The driving rod 83 drives the piston rod 71 to move towards the base 1. During the movement of the piston rod 71, the air in the air cylinder 7 and the suction hole 61 is pumped out by the piston rod 71, and a negative pressure state is formed in the suction hole 61. The suction cup 6 is tightly sucked on the ground under the action of the atmospheric pressure. The support stability of the support column 5 is improved by the adsorption of the three suction cups 6, so that the possibility of shaking when being collided by external forces during measurement is reduced, and further the stability of the theodolite during measurement is improved;

[0041] When the fixation needs to be released, the worker holds the handle and rotates the rotating shaft 91 in the reverse direction. The rotating shaft 91 drives the screw 81 to rotate in the reverse direction through the meshing action of the main bevel gear 92 and the secondary bevel gear 93. The rotation of the screw 81 drives the piston rod 71 to move toward the suction cup 6. During the movement, gas is re-introduced into the gas cylinder 7 and the suction hole 61. As the gas is introduced, the pressure difference between the inside and outside of the suction cup 6 gradually decreases, and the adsorption force of the suction cup 6 on the ground gradually decreases, thereby making it convenient for the surveying worker to move the theodolite body 01.

[0042] Reference Figure 3 , Figure 4 and Figure 5 A limiting assembly 11 is provided on the rotating shaft 91, and the limiting assembly 11 includes a limiting block 111 sleeved on the outer circumferential surface of the rotating shaft 91. The limiting block 111 is square, and a slider 112 is fixedly connected to the surface of the limiting block 111 facing the rotating shaft 91. The slider 112 and the limiting block 111 are integrally formed. A sliding groove 911 is provided on the surface of the rotating shaft 91 for slidingly cooperating with the slider 112. A limiting groove 101 is provided on the inner side wall of the rotating shaft 91. The outer surface of the limiting block 111 is tightly fitted with the inner side wall of the limiting groove 101. The limiting block 111 is slidably connected in the limiting groove 101. A second spring 113 is provided in the limiting groove 101. One end of the second spring 113 is fixedly connected to the inner side wall of the limiting groove 101, and the other end is connected to the surface of the limiting block 111. When the second spring 113 is in a natural state, the limiting block 111 is embedded in the limiting groove 101.

[0043] When it is necessary to rotate the rotating shaft 91, the worker pulls the limiting block 111 outward until the limiting block 111 disengages from the limiting groove 101. At this time, the first spring 33 is stretched and the rotating shaft 91 can be rotated. When the suction cup 6 is firmly adsorbed on the ground, the worker cancels the force on the limiting block 111, and the tension on the second spring 113 disappears. The second spring 113 resets and pulls the limiting block 111 to re-embed into the limiting groove 101. At this time, the limiting block 111 cannot rotate in the limiting groove 101. At the same time, under the restriction of the sliding groove 911 and the slider 112, the rotating shaft 91 cannot rotate either. The inability of the rotating shaft 91 to rotate fixes the position of the nut block 82 on the screw 81, thereby fixing the negative pressure state inside the suction hole 61, thereby avoiding the occurrence of the rotation phenomenon of the rotating shaft 91 due to accidental touching of the tester, and further improving the stability of the theodolite during the measurement process.

[0044] Reference Figure 4 and Figure 5, an installation cylinder 12 is fixedly connected to the bottom surface of the nut block 82. One end of the installation cylinder 12 away from the nut block 82 is fixedly connected with an installation ring plate 121. The installation ring plate 121 is slidably connected inside the cavity 42. A plurality of rollers 122 are fixedly connected to the surface of the installation ring plate 121 away from the nut block 82. In this embodiment, the number of rollers 122 is three. When the nut block 82 moves to the bottom end of the threaded section of the screw rod 81, the rollers 122 abut against the ground.

[0045] During the process of the nut block 82 moving towards the ground, the adsorption force of the suction cup 6 gradually disappears. At the same time, the nut block 82 drives the installation cylinder 12 to move downward, and the installation cylinder 12 drives the installation ring plate 121 to move. When the nut block 82 moves to the bottom end of the threaded section of the screw rod 81, the rollers 122 abut against the ground. Under the rolling action of the rollers 122, workers can move the theodolite body 01 by pushing the column 4, saving manpower. When it is necessary to fix the base 1 again, during the process of the nut block 82 moving towards the base 1, the nut block 82 drives the rollers 122 to move into the cavity 42 through the installation cylinder 12, and the rollers 122 are separated from the bottom surface. At the same time, the suction cup 6 adsorbs and fixes on the ground.

[0046] The implementation principle of a portable theodolite in an embodiment of the present application is as follows: During measurement, the theodolite body 01 is installed on the base 1 through the connection assembly 3 and the connection plate 2. Subsequently, by rotating the rotating shaft 91, the rotating shaft 91 drives the screw rod 81 to rotate through the main bevel gear 92 and the sub-bevel gear 93. The screw rod 81 drives the nut block 82 to move upward, the nut block 82 drives the driving rod 83 to move, and the driving rod 83 drives the piston rod 71 to move in a direction away from the suction cup 6. During the movement of the piston rod 71, the air in the air cylinder 7 and the suction holes 61 is pumped out, and a negative pressure state is formed in the suction holes 61. The suction cup 6 is tightly sucked on the ground under the action of atmospheric pressure. Under the adsorption action of the three suction cups 6, the support stability of the support column 5 is improved, so that the possibility of shaking when being collided by an external force during measurement is reduced, and thus the stability of the theodolite during measurement is improved.

[0047] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A portable theodolite, comprising a base (1), wherein the upper surface of the base (1) is provided with a theodolite body (01), and the lower surface of the base (1) is provided with a column (4) and three supporting columns (5), wherein the column (4) is arranged at the center of the base (1), characterized in that: The bottom surface of each support column (5) is provided with a suction cup (6), the suction surface of the suction cup (6) faces the ground, a receiving groove (51) is provided in the support column (5), a gas cylinder (7) is provided in the receiving groove (51), a suction hole (61) connected to the inside of the gas cylinder (7) is provided on the suction cup (6), a piston rod (71) is slidably connected to the inside of the gas cylinder (7), and a driving component (8) for driving the piston rod (71) to reciprocate along the length direction of the gas cylinder (7) is provided on the column (4).

2. A portable theodolite according to claim 1, characterized in that: A cavity (42) is provided inside the column (4), and the driving assembly (8) includes a screw rod (81) rotatably arranged inside the cavity (42), a nut block (82) is threadedly connected to the screw rod (81), and a driving rod (83) corresponding to the three piston rods (71) is hinged on the outer surface of the nut block (82), and one end of the driving rod (83) away from the nut block (82) is hinged on the piston rod (71), and a guide groove that slidably cooperates with the driving rod (83) is provided on the support column (5) and the column (4), and a rotating assembly (9) that drives the screw rod (81) to rotate is provided on the column (4).

3. A portable theodolite according to claim 2, characterized in that: A rotation groove (10) is provided on the outer wall of the column (4); the rotation assembly (9) comprises a rotation shaft (91) rotatably connected to the rotation groove (10); one end of the rotation shaft (91) extends into the cavity (42) and is fixedly connected to a main bevel gear (92); a secondary bevel gear (93) meshing with the main bevel gear (92) is fixedly connected to the screw rod (81); the main bevel gear (92) and the secondary bevel gear (93) are both rotatably arranged in the cavity (42); and a limiting assembly (11) for limiting the rotation of the rotation shaft (91) is provided on the rotation shaft (91).

4. A portable theodolite according to claim 3, characterized in that: The limiting assembly (11) comprises a limiting block (111) sleeved on the outer surface of the rotating shaft (91), a slider (112) being arranged on the limiting block (111), a sliding groove (911) slidably matched with the slider (112) being provided on the surface of the rotating shaft (91), a limiting groove (101) being provided on the inner side wall of the rotating groove (10), the limiting block (111) being slidably arranged in the limiting groove (101), a second spring (113) being arranged in the limiting groove (101), one end of the second spring (113) being connected to the inner side wall of the limiting groove (101), and the other end being connected to the limiting block (111), and when the second spring (113) is in a natural state, the limiting block (111) is embedded in the limiting groove (101).

5. A portable theodolite according to claim 4, characterized in that: A mounting tube (12) is arranged on the bottom surface of the nut block (82); a mounting ring plate (121) is arranged at one end of the mounting tube (12) away from the nut block (82); the mounting ring plate (121) is slidably connected in the cavity (42); a plurality of rollers (122) are arranged on the mounting ring plate (121); when the nut block (82) moves to the bottom end of the threaded section of the screw rod (81), the rollers (122) abut against the ground.

6. A portable theodolite according to claim 1, characterized in that: The surface of the base (1) is provided with a connection disk (2), the bottom surface of the theodolite body (01) is provided with a connection assembly (3), and the theodolite body (01) is detachably connected to the connection disk (2) via the connection assembly (3).

7. A portable theodolite according to claim 6, characterized in that: The connection assembly (3) comprises a plug post (31) arranged on the theodolite body (01); a slot (21) slidably matched with the plug post (31) is provided on the connection plate (2); fixing blocks (32) are provided at opposite ends of the plug post (31); a fixing groove (22) slidably matched with the fixing block (32) is provided on the inner side wall of the slot (21); an arc groove (23) communicating with the fixing groove (22) is provided on the inner bottom wall of the slot (21); A first spring (33) is arranged on the inner bottom wall of the slot (21); one end of the first spring (33) is connected to a clamping plate (34); one end of the clamping plate (34) is inserted into the arc groove (23) and slidably cooperates with the arc groove (23); a clamping groove (24) for inserting the fixing block (32) is provided on the side wall of the arc groove (23); when the first spring (33) is in a natural state, the fixing block (32) is clamped in the clamping groove (24) by the clamping plate (34).

8. The portable theodolite according to claim 1, characterized in that: A rubber pad (41) is provided on the surface of the column (4) close to the bottom surface.

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