Checking device for engineering measuring instrument

By combining the rotary support, the horizontal detection component, and the auxiliary support component, the problem of existing devices being unable to quickly adjust the angle and detect the level is solved, thus achieving fast, accurate, and stable measurement results for engineering surveying instruments.

CN223579424UActive Publication Date: 2025-11-21SHANDONG YUANHONG SURVEY PLANNING DESIGN CO LTD
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Patent Information

Application Number
CN202423178610.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-11-21
Estimated Expiration
2034-12-23

AI Technical Summary

Technical Problem

Existing engineering surveying instrument calibration devices cannot quickly adjust the angle of the load-bearing components and cannot detect whether the car body is in a horizontal position when fixed, which affects the detection accuracy and stability of the surveying instruments.

Method used

The device employs a slewing support, a level detection component, an electric telescopic rod, and an auxiliary support component. The slewing support enables the rotational adjustment of the support platform, the level detection component monitors the level status in real time, and the auxiliary support component provides additional support force to ensure the stability and precise adjustment of the device.

Benefits of technology

It enables rapid orientation adjustment of engineering surveying instruments, ensuring the accuracy and stability of measurement results, improving the flexibility and adaptability of the device, and enhancing the precision and safety of measurements.

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Abstract

The utility model belongs to the technical field of engineering measurement verification equipment, and relates to a verification device for an engineering measurement instrument, which comprises a rotary support body, a horizontal detection assembly and symmetrically arranged electric telescopic rods which are arranged on a support main body, and the rotary support body is connected with a bearing platform through a height adjusting assembly. Clamping assemblies which are oppositely arranged are arranged on the bearing table, a plurality of auxiliary supporting assemblies are installed on the two sides, close to the horizontal detection assembly, of the supporting body, and the electric telescopic rod is connected with a collimator through a collimator adjusting device. The height and the horizontal angle of the bearing table are adjusted through the rotary supporting body and the height adjusting assembly, and the position and the horizontal angle of the collimator are adjusted in cooperation with the electric telescopic rod and the collimator adjusting device. The horizontal detection assembly can detect whether the whole device is in a horizontal state or not in real time, and the auxiliary supporting assembly not only can provide additional supporting force, but also can ensure that the whole device is in the horizontal state to provide a stable reference for an engineering measuring instrument.
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Description

TECHNICAL FIELD

[0001] The utility model relates to engineering surveying and checking equipment technical field especially relates to a kind of checking device for engineering surveying instrument. BACKGROUND

[0002] The direct placement of measuring instrument on ground when using can cause the abrasion of surveying instrument, and the fixed requirement of its position placement, so that it cannot be flexibly placed according to the specific situation of space, and generally needs the support seat to facilitate the fine adjustment of the base of engineering surveying instrument, so as to make the measurement result of engineering surveying instrument accurate.

[0003] In the new type road engineering surveying instrument checking device disclosed in Chinese patent CN 217083769 U, the vehicle box further comprises a balancing assembly, a supporting assembly, a bearing assembly, a lifting assembly and a limiting assembly. The balancing assembly comprises a sleeve connected to the top end of the inner wall of the vehicle box, a supporting leg connected to the inner wall of the sleeve and a fastening bolt connected to the side wall of the sleeve. The supporting assembly comprises a supporting rod connected to the top end of the vehicle box and a clamping component connected to the top end of the supporting rod. The bearing assembly comprises a sleeve table connected to the top end of the vehicle box, an extension rod connected to the inner wall of the sleeve table, a bearing table connected to the top end of the extension rod and a first bolt connected to the side wall of the bearing table. The lifting assembly is connected to the inner wall of the vehicle box and cooperates with the bearing assembly. The limiting assembly is connected to the side wall of the vehicle box and cooperates with the lifting assembly. The supporting assembly, the bearing assembly, the lifting assembly and the limiting assembly can fix the instrument and the parallel light pipe, avoid the extension rod from sliding down and improve the use effect of the device.

[0004] However, this patent cannot quickly adjust the angle of the bearing assembly, and can only be adjusted by the universal wheels at the bottom of the vehicle box, and cannot detect whether the vehicle box is in a horizontal position when fixed, which affects the subsequent measurement of the instrument. Utility model content

[0005] To solve the existing, the utility model provides a kind of checking device for engineering surveying instrument.

[0006] The utility model discloses a technical scheme is realized through the following scheme: a kind of checking device for engineering surveying instrument, including support main body, rotary support, bearing table and height adjustment assembly, rotary support, horizontal detection component and symmetrically arranged electric telescopic rod are installed on the support main body, rotary support is connected bearing table by height adjustment assembly, bearing table is equipped with the clamping assembly of opposite arrangement, the both sides of support main body close to horizontal detection component are equipped with a plurality of auxiliary support assembly, rotary support is located between two electric telescopic rods, controller is installed in horizontal detection component side, electric telescopic rod is connected parallel light pipe by light pipe adjusting device, controller is connected rotary support, height adjustment assembly, clamping assembly, auxiliary support assembly and electric telescopic rod with communication.

[0007] Through the above technical scheme, rotary support is used to realize the rotation adjustment of bearing table, so as to quickly adjust the direction of engineering surveying instrument, bearing table is used to place engineering surveying instrument, is connected with rotary support by height adjustment assembly, realizes the height adjustment in vertical direction;Electric telescopic rod is symmetrically arranged on support main body, is connected parallel light pipe by light pipe adjusting device, for adjusting the position and horizontal angle of parallel light pipe, to adapt to different measurement requirements;Horizontal detection component can detect whether the whole is in horizontal state in real time, ensure the accuracy of measurement result, auxiliary support assembly not only can provide additional support force, enhance the stability of whole device, also ensure that the whole equipment is in horizontal state, provide stable benchmark for engineering surveying instrument.

[0008] As preferred, the rotary support body includes a speed reducer, a rotary support, and a protective support shell, the speed reducer drive gear is engaged with the rotary support outer ring, the rotary support inner ring is bolted to the support body, the protective support shell covers the speed reducer drive gear and the rotary support, and the speed reducer is detachably installed on the bottom surface of the support body.

[0009] As preferred, the horizontal detection component includes a transparent protective plate, a level, and a plumb bob, the level is fixedly installed in the receiving protective box groove through the symmetrically arranged fixing columns, the plumb bob is detachably installed in the receiving protective box groove, a scale disc is arranged around the receiving protective box groove on the side of the plumb bob, and the transparent protective plate is detachably installed on the receiving protective box.

[0010] As preferred, the auxiliary support assembly includes a second screw rod lifting device, a moving seat, a conical fixing head, and a receiving cover, the moving seat is installed on the second screw rod lifting device, the moving seat is slidingly installed in the receiving cover, the conical fixing head is installed on the bottom surface of the moving seat, and the receiving cover is fixedly installed on the support body.

[0011] The driving gear of the speed reducer is engaged with the outer ring of the slewing bearing to drive rotation, so that the cover of the protective support shell not only plays a protection role, prevents sundries from entering and reduces noise, but also can adjust the horizontal angle of the engineering surveying instrument; the level meter is in an absolute horizontal state through the symmetrically arranged fixing columns, ensuring the accuracy of measurement, and the plumb bob is detachably installed, so that the plumb bob can be detached when the mobile device is moved as a whole, effectively avoiding that the plumb bob shakes back and forth to cause damage to the case and the transparent baffle when the workpiece is moved, improving the service life, accuracy and precision of measurement, and ensuring the reliability of the measurement result; the auxiliary support assembly enables the calibration device to be accurately adjusted in height according to different environments and requirements, so that the calibration device is in a horizontal state, and the flexibility and adaptability thereof are enhanced.

[0012] As preferred, the height adjustment assembly comprises a plurality of telescopic rods, an electric cylinder and a locking piece, the plurality of telescopic rods are arranged around the side of the electric cylinder, and the telescopic rods and the electric cylinder are fixedly connected with the bearing table.

[0013] As preferred, the clamping assembly comprises a first screw rod lifting device and a clamping plate, the clamping plate is slidably installed on the first screw rod lifting device, and a rubber pad is installed on the bottom surface of the clamping plate.

[0014] As preferred, a brake wheel is installed on the bottom surface of the support body, an antiskid pad is arranged on the top surface of the bearing table, and a gripping handle is installed on the top surface of the horizontal detection assembly.

[0015] Through the above technical scheme, the electric cylinder and the plurality of telescopic rods are multi-supported and fixedly connected with the bearing table, so as to ensure the stability and bearing capacity of the bearing table after height adjustment, and the telescopic rods are detachably connected with the locking piece through the mounting holes, so as to facilitate locking after height adjustment and ensure the stability after adjustment; the clamping assembly can adapt to engineering surveying instruments of different sizes, and the rubber pad and the antiskid pad increase friction to prevent the instruments from sliding or shaking, thereby improving the accuracy and safety of measurement.

[0016] In summary, the utility model has the following beneficial effects:

[0017] 1.The utility model discloses a rotary support body is used for realizing the rotation adjustment of bearing table, thereby the direction of engineering surveying instrument is adjusted quickly, and the bearing table is used for placing engineering surveying instrument, is connected with the rotary support body through height adjustment subassembly, realizes the height adjustment in vertical direction, and the electric telescopic link is symmetrically set up on the support main body, is connected parallel light pipe through the light pipe adjusting device, is used for adjusting the position and horizontal angle of parallel light pipe to adapt to different measurement demand, and the horizontal detection subassembly can detect whether the whole is in the horizontal state in real time, ensures the accuracy of measurement result, and the auxiliary support subassembly not only can provide additional support force, enhances the stability of whole device, but also ensures that the whole equipment is in the horizontal state, provides stable benchmark for engineering surveying instrument.

[0018] 2.The reduction gear drive gear is engaged with the outer ring of the rotary bearing and is connected to drive rotation, so that the cover of the protective support shell not only plays a protective role, prevents sundries from entering and reduces noise, but also can adjust the horizontal angle of the engineering surveying instrument; the level meter is in an absolute horizontal state through the symmetrically arranged fixed column, ensuring the accuracy of the measurement, and the plumb bob can be detachably installed, which can be detached when the whole mobile device is moved, effectively avoiding the damage to the case and transparent baffle caused by the back and forth shaking of the plumb bob when the workpiece is moved, improving the service life, accuracy and precision of the measurement, and ensuring the reliability of the measurement result; the auxiliary support subassembly enables the calibration device to accurately adjust the height according to different environments and needs, so that the calibration device is in a horizontal state, enhancing its flexibility and adaptability.

[0019] 3.The electric cylinder and the plurality of telescopic rods are connected to support and fix the bearing table, ensuring the stability and load-bearing capacity of the bearing table after height adjustment, and the telescopic rods are detachably connected to the locking pieces through the mounting holes, facilitating locking after height adjustment and ensuring the stability after adjustment; the clamping assembly can adapt to engineering surveying instruments of different sizes and increase friction through rubber pads and non-slip pads to prevent the instruments from slipping or shaking, improving the accuracy and safety of the measurement. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the utility model from the rear view angle;

[0022] Figure 3 is a schematic diagram of the three-dimensional structure of the utility model from the bottom view angle;

[0023] Figure 4 is a schematic diagram of the three-dimensional structure of the rotary support body of the utility model;

[0024] Figure 5 is a schematic diagram of the sectional structure of the auxiliary support subassembly of the utility model;

[0025] Figure 6 is the internal structure schematic view of the light pipe adjusting device of the utility model;

[0026] Figure 7 is the three-dimensional structure schematic view of the horizontal detection assembly and the controller.

[0027] Mark explanation: 1, rotary support body; 11, speed reducer; 12, rotary support; 13, protective support shell; 2, bearing table; 3, height adjustment assembly; 31, telescopic rod; 32, electric cylinder; 33, locking piece; 4, clamping assembly; 41, first lead screw lifting device; 42, clamping plate; 5, auxiliary support assembly; 51, second lead screw lifting device; 52, moving seat; 53, conical fixed head; 54, storage cover; 6, horizontal detection assembly; 7, electric telescopic rod; 8, collimator; 9, light pipe adjusting device; 91, light pipe locking piece; 92, bevel gear transmission piece; 93, protective box; 94, adjusting handle; 10, controller. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the drawings and examples.

[0029] In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the utility model, but the utility model can also be implemented in other ways different from the description herein, therefore, the utility model is not limited to the specific embodiments disclosed in the following disclosure, the utility model is further described in detail below in conjunction with the drawings.

[0030] A kind of calibration device for engineering surveying instrument, as shown in Fig. Figures 1-7 A kind of calibration device for engineering surveying instrument,

[0031] The utility model provides a kind of engineering surveying instrument, including support body, rotary support 1, bearing table 2 and height adjustment component 3, rotary support 1, horizontal detection component 6 and symmetrically arranged electric telescopic rod 7 are installed on support body, rotary support 1 is connected bearing table 2 by height adjustment component 3, bearing table 2 is equipped with oppositely arranged clamping component 4, support body is close to the two sides of horizontal detection component 6 and is equipped with several auxiliary support components 5, rotary support 1 is located between two electric telescopic rods 7, controller 10 is installed on the side of horizontal detection component 6, electric telescopic rod 7 is connected parallel light pipe 8 by light pipe adjusting device 9, controller 10 is connected with rotary support 1, height adjustment component 3, clamping component 4, auxiliary support component 5 and electric telescopic rod 7, brake wheel is installed on the bottom surface of support body, bearing table 2 top is equipped with antiskid pad, gripping handle is installed on the top of horizontal detection component 6, the number of auxiliary support component 5 is preferably four, is installed in the side of four brake wheels, after being moved to suitable position, when not being in horizontal state, four auxiliary support components 5 are extended and cooperate horizontal detection component 6 observation, until being in horizontal state, engineering surveying instrument is installed to bearing table 2, is clamped and fixed by clamping component 4, the horizontal angle and orientation of engineering surveying instrument and parallel light pipe 8 are adjusted by rotary support 1 and light pipe adjusting device 9, the height of bearing table 2 can be accurately adjusted by height adjustment component 3, ensure that engineering surveying instrument reaches the required working height, the cooperation of horizontal detection component 6 and auxiliary support component 5 ensures that the system can be quickly and accurately adjusted to horizontal state after being moved to suitable position, provides stable reference for engineering surveying instrument.

[0032] Light pipe adjusting device 9 is located at the telescopic end of electric telescopic rod 7, and the light pipe adjusting device 9 comprises a light pipe locking part 91, a bevel gear transmission part 92, a protection box 93 and an adjusting handle 94. The protection box 93 is fixedly installed at the telescopic end of the electric telescopic rod 7, and a hollow groove is formed in the protection box 93. The bevel gear transmission part 92 is located in the hollow groove of the protection box 93. The adjusting handle 94 is fixedly connected to one end of the bevel gear transmission part 92. The other end of the bevel gear transmission part 92 is connected to the bottom surface of the light pipe locking part 91. The transmission shaft connected with the bevel gear and the light pipe locking part 91 penetrates through the bottom surface of the hollow groove of the protection box 93. A bearing is installed at the connection between the transmission shaft and the bottom surface of the hollow groove, so as to enhance the support and prolong the service life of the equipment. The parallel light pipe 8 is fixed by the light pipe locking part 91, so as to facilitate the adjustment of the horizontal angle and the disassembly and maintenance.

[0033] The slewing support body 1 comprises a speed reducer 11, a slewing support 12 and a protective support shell 13, the speed reducer 11 is connected with the slewing support outer ring through gear engagement, the slewing support 12 is connected with the support main body through bolt connection, the protective support shell 13 is arranged on the speed reducer 11 and the slewing support 12, the speed reducer 11 is detachably installed on the bottom surface of the support main body, the outer surface of the speed reducer 11 is fixed with a protective plate through bolts, the slewing support 12 outer ring is supported by the inner ring, and the outer ring is not arranged on the support main body but has a certain distance from the support main body, when the driving gear of the slewing support 12 is driven, the outer ring rotates on the inner ring, the protective support shell 13 is installed on the outer ring through a plurality of bolts, so that the protective support shell 13 is driven to rotate, thereby driving the engineering surveying instrument on the bearing table 2 to adjust, the protective support shell 13 not only supports the adjustment of the engineering surveying instrument, but also protects the slewing support body 1, thereby avoiding the meshing failure caused by the interference of sundries, and improving the reliability and service life of the equipment.

[0034] The horizontal detection assembly 6 comprises a transparent protective plate, a level and a plumb bob, the level is fixedly installed in the receiving protective box groove through symmetrically arranged fixing columns, the plumb bob is detachably installed in the receiving protective box groove, a scale disc is arranged around the receiving protective box groove on the side of the plumb bob, the transparent protective plate is detachably installed on the receiving protective box, the plumb bob is located below the level, a threaded hole matched with the plumb bob is formed in the receiving protective box groove, the plumb bob is threadedly connected in the threaded hole and can be detached at any time, the plumb bob is protected by the transparent protective plate, the transparent protective plate is slidably arranged on the receiving protective box and is fixed to the receiving protective box through bolts, the interior of the receiving protective box can be cleaned and maintained by pulling out the transparent protective plate, the level is fixed to be in an absolute horizontal state through two fixing columns, the bubble is observed to determine whether the workpiece is in a horizontal state, the plumb bob and the scale disc are matched to determine whether the workpiece is vertical and record the deviation value of the plumb line and the scale disc in a non-vertical state, and the plumb bob can be removed through the bolt to be stored, thereby effectively avoiding the damage of the case and the transparent baffle caused by the back and forth shaking of the plumb bob when the workpiece is moved.

[0035] The auxiliary support assembly 5 comprises a second screw lifting device 51, a moving seat 52, a conical fixing head 53 and a receiving cover 54, the moving seat 52 is installed on the second screw lifting device 51, the moving seat 52 is slidably installed in the receiving cover 54, the conical fixing head 53 is installed on the bottom surface of the moving seat 52, the receiving cover 54 is fixedly installed on the support main body, a through hole is formed in the bottom surface of the receiving cover 54, a sliding channel is formed in the through hole, the moving seat 52 is slidably installed through the sliding channel, the second screw lifting device 51 is driven to make the moving seat 52 drive the conical fixing head 53 to sink and be fixed to the ground, when an inclined ground is encountered, the four auxiliary support assemblies 5 can sink by appropriate distances respectively, so that the whole equipment is horizontally supported until the horizontal detection assembly 6 is in a horizontal position.

[0036] The height adjusting assembly 3 comprises a plurality of telescopic rods 31, an electric cylinder 32 and a locking piece 33, the telescopic rods 31 are arranged around the side of the electric cylinder 32, the telescopic rods 31 and the electric cylinder 32 are fixedly connected to the bearing table 2, the telescopic rods 31 are detachably connected to the locking piece 33 through the mounting hole, the number of the telescopic rods 31 is preferably four, which are arranged in a square around the side of the electric cylinder 32 for effective support, the electric cylinder 32 is located at the center position of the protective support shell 13 of the rotary support body 1, one locking hole is mounted on the outer rod of the telescopic rod 31, a plurality of plug-in holes are arranged in the inner rod of the telescopic rod 31, in order to prevent the telescopic rod 31 from retracting, the locking piece 33 is mounted on the outer rod mounting hole and tightened to the corresponding mounting hole in the inner layer to complete the fixation of the telescopic rod 31.

[0037] The clamping assembly 4 comprises a first lead screw lifting device 41 and a clamping plate 42, the clamping plate 42 is slidably mounted on the first lead screw lifting device 41, a rubber pad is mounted on the bottom surface of the clamping plate 42, the first lead screw lifting device 41 drives the clamping plate 42 to adjust and clamp and fix the engineering surveying instrument, and the damage to the engineering surveying instrument is reduced through the rubber pad, the lead screw can be effectively self-locked and accurately adjusted.

[0038] Working principle: the worker pushes the device to the appropriate position, steps on the brake pad to fix the brake wheel, removes the transparent protective plate, installs the plumb line, and observes whether the level and the plumb line are in a horizontal state, if not, adjusts through the auxiliary support assembly 5 on the side until the horizontal state;

[0039] The bearing table 2 is lowered by the height adjusting assembly 3 controlled by the controller 10, the engineering surveying instrument is installed on the bearing table 2 and further clamped and fixed by the clamping assembly 4, and is adjusted to the appropriate height by the height adjusting assembly 3, and the further collimator 8 is adjusted by the electric telescopic rod 7 until the appropriate height;

[0040] When the horizontal angle needs to be adjusted, the rotary support body 1 is started to rotate by the controller 10, so as to drive the engineering surveying instrument to adjust, at this time, the collimator 8 is driven to be finely adjusted by rotating the adjusting handle 94 through the transmission of the bevel gear transmission member 92 until the appropriate position for data measurement.

[0041] The parts and devices all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here, and the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0042] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields with equivalent changes, but any simple modification or equivalent change made to the above embodiments according to the technical essence of the present application still falls within the protection scope of the present application technical scheme.

Claims

1. A verification device for a surveying instrument, characterised in that: The utility model provides a kind of horizontal detection device for supporting body, rotary support (1), bearing table (2) and height adjustment component (3) are included, rotary support (1), horizontal detection component (6) and symmetrically arranged electric telescopic rod (7) are installed on the supporting body, rotary support (1) is connected bearing table (2) by height adjustment component (3), bearing table (2) is equipped with oppositely arranged clamping component (4), the both sides of supporting body close to horizontal detection component (6) are installed with several auxiliary support components (5), rotary support (12) is located between two electric telescopic rods (7), controller (10) is installed on the side of horizontal detection component (6), electric telescopic rod (7) is connected parallel light pipe (8) by light pipe adjusting device (9), controller (10) is connected rotary support (1), height adjustment component (3), clamping component (4), auxiliary support component (5) and electric telescopic rod (7) in communication.

2. A checking device for engineering surveying instruments according to claim 1, characterized in that: The rotary support (1) includes a speed reducer (11), a rotary support (12) and a protective support shell (13), the speed reducer (11) drives a gear to engage a rotary bearing outer ring, the rotary support (12) inner circle is bolted to the support body, the protective support shell (13) is covered on the speed reducer (11) drive gear and the rotary support (12), and the speed reducer (11) is detachably installed on the bottom surface of the support body.

3. A testing apparatus for engineering surveying instruments according to claim 1, characterized in that: The horizontal detection component (6) includes a transparent protective plate, a level and a plumb bob, the level is fixedly installed in the receiving protective box groove by symmetrically arranged fixing columns, the plumb bob is detachably installed in the receiving protective box groove, a scale disc is arranged around the receiving protective box groove on the side of the plumb bob, and the transparent protective plate is detachably installed on the receiving protective box.

4. A testing apparatus for engineering surveying instruments according to claim 1, characterized in that: The auxiliary support component (5) includes a second screw rod lifting device (51), a moving seat (52), a conical fixing head (53) and a receiving cover (54), the second screw rod lifting device (51) is installed with the moving seat (52), the moving seat (52) is slidingly installed in the receiving cover (54), the conical fixing head (53) is installed on the bottom surface of the moving seat (52), and the receiving cover (54) is fixedly installed on the support body.

5. A testing apparatus for engineering surveying instruments according to claim 1, characterized in that: The height adjustment component (3) includes a plurality of telescopic rods (31), an electric cylinder (32) and a locking piece (33), a plurality of telescopic rods (31) are arranged around the side of the electric cylinder (32), the telescopic rods (31) and the electric cylinder (32) are both fixedly connected to the bearing table (2), and the telescopic rods (31) are detachably connected to the locking piece (33) through mounting holes.

6. A testing apparatus for engineering surveying instruments according to claim 1, characterized in that: The clamping component (4) includes a first screw rod lifting device (41) and a clamping plate (42), the first screw rod lifting device (41) is slidingly installed with the clamping plate (42), and the bottom surface of the clamping plate (42) is installed with a rubber pad.

7. A testing apparatus for engineering surveying instruments according to claim 1, characterized in that: A brake wheel is installed on the bottom surface of the support body, an antiskid pad is arranged on the top surface of the bearing table (2), and a grip handle is installed on the top surface of the horizontal detection component (6).

Citation Information

Patent Citations

  • Novel road engineering measuring instrument calibration device

    CN217083769U