Apparatus for construction site calibration of inclinometer sensors

Abstract

This utility model discloses a device for calibrating inclinometer sensors on construction sites, comprising a housing, within which a worm gear reduction mechanism is installed. The worm gear reduction mechanism includes a horizontally arranged input shaft and an output shaft. A handwheel is located at the end of the input shaft on the outside of the housing. An angle measuring scale is installed at the connection between the output shaft and the housing. The end of the output shaft extends outside the housing and is connected to a mounting base via a quick-connect mechanism. The mounting base has two insertion slots at its bottom that mate with the connecting piece at the top of the inclinometer sensor. These insertion slots intersect to form a cross-shaped structure. Each insertion slot has threaded holes on both sides for fixing the connecting piece. This utility model improves the installation efficiency of the inclinometer sensor, effectively simplifies the complex adjustment steps of traditional processes, eliminates tedious manual operation, thereby reducing human error and improving calibration accuracy.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular to a device for calibrating inclination sensors at construction sites. Background Technology

[0002] Inclinometers, as key monitoring equipment in water conservancy projects and building construction, are mainly used to monitor changes in the tilt angle of structures and promptly detect potential structural problems during construction. With the increasing scale and complexity of construction projects, higher demands are placed on the accuracy and reliability of inclinometers, while the calibration of inclinometer sensors at construction sites remains a challenge. Currently, on-site calibration of inclinometer sensors mainly relies on manual installation and adjustment or the use of standard angle molds for positioning. These traditional methods typically require disassembling, realigning, and re-fixing the sensor when adjustment of the calibration angle is needed, resulting in cumbersome procedures and inconvenient angle adjustments. Furthermore, existing methods struggle to achieve rapid, continuous multi-angle calibration; angle adjustments largely depend on manual operation, which is not only inefficient but also prone to introducing human error, making it difficult to maintain consistent calibration accuracy. In the complex and variable environment of construction sites, these problems further affect the accuracy and reliability of inclinometer sensor calibration results, limiting their effective monitoring capabilities. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a high-precision and easy-to-use device for calibrating inclinometer sensors at construction sites. Specifically, the following technical solution can be adopted: The device for calibrating inclinometer sensors at construction sites according to this utility model includes a housing. A worm gear reduction mechanism is installed inside the housing. The worm gear reduction mechanism includes a horizontally arranged input shaft and an output shaft. A handwheel is located on the outside of the housing at the end of the input shaft. An angle measuring scale is installed at the connection between the output shaft and the housing. The end of the output shaft extends outside the housing and is connected to a mounting base via a quick-connect mechanism. The bottom of the mounting base has two insertion slots adapted to the connecting piece at the top of the inclinometer sensor. The insertion slots intersect to form a cross-shaped structure. Each insertion slot has threaded holes on both sides for fixing the connecting piece.

[0004] This invention uses a worm gear reduction mechanism to transmit the power input from the handwheel to the insert base, allowing the inclinometer sensor mounted on the insert base to rotate and shift its angle. The inclinometer sensor is then calibrated by comparing the real-time tilt angle value monitored by the inclinometer sensor with the actual tilt angle measured by an angle measuring ruler. The insert base has a cross-shaped insertion slot at its bottom, allowing the inclinometer sensor to be quickly connected to the insert base in two mounting positions, enabling rapid calibration of the dual-axis inclinometer sensor. Clearly, this invention improves the installation efficiency of the inclinometer sensor. During calibration, only the handwheel needs to be rotated to precisely control the rotation of the output shaft, enabling continuous adjustment of the inclinometer sensor at different angles. This effectively simplifies the complex adjustment steps of traditional processes, eliminating tedious manual operation, thereby reducing human error and improving calibration accuracy.

[0005] Preferably, the worm gear reducer employs a two-stage worm gear reducer, including a primary worm coaxially arranged with the input shaft, a primary worm wheel meshing with the primary worm on one side, a vertical connecting rod at the center of the primary worm wheel, the vertical connecting rod being coaxially arranged with the secondary worm, a secondary worm wheel meshing with the secondary worm on one side, and the output shaft at the center of the secondary worm wheel. Through this two-stage worm gear transmission, the input speed of the handwheel is significantly reduced, allowing the output shaft to rotate slowly and precisely, facilitating fine-tuning operations.

[0006] Preferably, the lead angle of the first-stage worm is less than or equal to the equivalent friction angle between the first-stage worm wheel and the first-stage worm material, and the lead angle of the second-stage worm is less than or equal to the equivalent friction angle between the second-stage worm wheel and the second-stage worm material. This design enables the worm gear mechanism to possess a reverse self-locking characteristic, effectively preventing the output shaft from reversing due to external forces during measurement, thus ensuring the stability and reliability of the equipment.

[0007] Preferably, the housing is a structure that is large at both ends and small in the middle, adapted to the worm gear reduction mechanism. It includes an upper housing for accommodating the first-stage worm and worm wheel, a gripping sleeve for accommodating the vertical connecting rod, and a lower housing for accommodating the second-stage worm and worm wheel. Both the upper and lower housings are made of high-strength aluminum alloy, featuring light weight and high strength. The gripping sleeve in the middle is made of stainless steel and is fixedly connected to the upper and lower housings, thus forming a robust and easy-to-grip frame structure, which is very convenient for carrying and use on the construction site.

[0008] Preferably, the handwheel and the angle measuring scale are located at opposite ends of the housing. The angle measuring scale includes a fixed disk on the housing and a rotating disk on the output shaft. The fixed disk is a full-circle scale with a graduation of 1°, and the rotating disk has an annular structure. A vernier scale is provided on the rotating disk, with n equal graduations. The total angle of the vernier scale is (n-1)° on the fixed disk, and a pointer is provided at the 0 position of the vernier scale. As a calibration component, the angle measuring scale can improve the resolution of the angle reading to (1 / n)°, thereby achieving accurate calibration of the rotation angle of the inclinometer sensor.

[0009] Preferably, the quick-connect mechanism includes a plug-in hole on the top of the insert base that matches the outer diameter of the output shaft. The inner wall of the plug-in hole has a locking groove. It also includes a spring-loaded locking block on the output shaft that matches the locking groove. When installing the inclinometer sensor, simply align the plug-in hole of the insert base with the output shaft, ensuring the locking groove and spring-loaded locking block are aligned. The insert base is then fitted onto the output shaft. When the predetermined position is reached, the spring-loaded locking block springs into the locking groove, locking the position. At this point, the central axes of the insert base and the output shaft remain perpendicular. For disassembly, simply press the spring-loaded locking block and pull the insert base outwards. This mechanism makes the installation and adjustment of the inclinometer sensor more convenient.

[0010] The device for calibrating inclinometer sensors at construction sites provided by this utility model achieves rapid installation and high-precision calibration of the inclinometer sensors through the coordinated operation of a handwheel, worm gear reduction mechanism, quick-connect components, and angle measuring ruler. Compared with traditional methods that rely on manual adjustment or standard angle molds, this utility model solves the problems of cumbersome operation, inconvenient angle adjustment, and difficulty in continuous multi-angle calibration. It effectively avoids human error introduced by repeated disassembly and manual adjustment. It adopts a mechanical structure design, which is compact, lightweight, and easy to install. It has good stability, vibration resistance, and bump resistance, and can withstand long-distance transportation, making it especially suitable for field and complex construction site environments.

[0011] Building upon this foundation, this invention introduces a high-precision calibration component based on the vernier caliper principle. It employs a dual-protractor structure combining a fixed disc and a rotating disc. The fixed disc provides the basic angle reference, while the rotating disc rotates synchronously with the sensor. By precisely aligning the main scale with the subdivision scale during the relative motion of the two discs, the rotation angle can be finely differentiated, raising the angle measurement accuracy to the level of subdivision scale graduations. This design significantly enhances angle resolution and calibration controllability, improves the reliability of calibration data, ensures the accurate transmission and analysis of real-time monitoring data, and provides strong support for on-site monitoring. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 yes Figure 1 A simplified structural diagram of a worm gear reducer.

[0014] Figure 3 yes Figure 1 A schematic diagram of the structure of a mid-angle measuring ruler.

[0015] Figure 4 yes Figure 1 Enlarged view of part A in the image.

[0016] Figure 5 yes Figure 4 A schematic diagram of the structure of the middle insert socket.

[0017] Figure 6 yes Figure 4 A schematic diagram of the top connecting piece of the inclinometer sensor. Detailed Implementation

[0018] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0019] like Figure 1-6 As shown, the device for calibrating inclination sensors at construction sites according to this utility model includes a housing consisting of an upper shell 11, a lower shell 12, and a gripping cylinder 13. The upper shell 11 and the lower shell 12 are both made of high-strength aluminum alloy, which is lightweight and has high strength. The gripping cylinder 13 in the middle is made of stainless steel and is fixedly connected to the upper shell 11 and the lower shell 12, forming a structure that is large at both ends and small in the middle. This structure is not only easy to hold, but also compatible with the worm gear reduction mechanism set inside the housing.

[0020] The above-mentioned worm gear reduction mechanism adopts a two-stage worm gear reduction device, such as... Figure 2As shown, the system includes a primary worm gear 21 coaxially arranged with the input shaft. A primary worm wheel 22 meshes with the primary worm gear 21 on one side. A vertical connecting rod 23 is located at the center of the primary worm wheel 22, and the vertical connecting rod 23 is coaxially arranged with a secondary worm gear 24. A secondary worm wheel 25 meshes with the secondary worm gear 24 on one side. An output shaft is located at the center of the secondary worm wheel 25. Both the input and output shafts are horizontally oriented. The input shaft is rotatably connected to the upper housing 11, and a handwheel 3 is mounted on its end outside the housing. The output shaft is rotatably connected to the lower housing 12, and an angle measuring scale 4 is located at their connection point. Furthermore, a mounting base 6 located outside the housing is mounted on the end of the output shaft via a quick-connect mechanism 5. The mounting base is used to connect a clinometer sensor 7 to be calibrated. The lead angle of the first-stage worm 21 is less than or equal to the equivalent friction angle between the materials of the first-stage worm wheel 22 and the first-stage worm 21, and the lead angle of the second-stage worm 24 is less than or equal to the equivalent friction angle between the materials of the second-stage worm wheel 25 and the second-stage worm 24. This gives the worm gear mechanism a reverse self-locking characteristic, effectively preventing the output shaft from reversing due to external force during measurement, ensuring the stability and reliability of the equipment. Normally, the handwheel 3 and the insert seat 6 are located on opposite sides of the housing to avoid interference between the operation of the handwheel 3 and the inclinometer sensor 7. When the handwheel 3 is turned, the inclinometer sensor 7 mounted on the insert seat 6 slowly rotates around the output shaft due to the deceleration effect of the two-stage worm gears. During this process, the tilt angle value displayed by the inclinometer sensor 7 is monitored in real time. When the predetermined angle is reached, the handwheel 3 is stopped. At this time, the actual tilt angle of the inclinometer sensor 7 is read through the angle measuring ruler 4 and compared with the real-time tilt angle value for calibration.

[0021] The aforementioned angle measuring scale 4 includes a fixed disk 41 mounted on the housing and a rotating disk 42 mounted on the output shaft. The fixed disk 41 is a full-circle scale with a graduation of 1°. The rotating disk 42 has an annular structure and a vernier scale 43 with n equal divisions. The total angle of these n divisions is (n-1)° on the fixed disk, and a pointer 44 is provided at the 0 position of the vernier scale 43. Its operating principle is the same as that of a vernier caliper, which can improve the resolution of the angle reading to (1 / n)°, thereby achieving accurate calibration of the rotation angle of the inclinometer sensor 7. In this embodiment, the vernier scale 43 has 10 equal divisions (see... Figure 3 The total angle of these 10 equal divisions is 9° on the fixed plate, which can improve the resolution of the angle reading to 0.1°. Of course, the specific settings of the vernier scale 43 can also be changed according to the calibration accuracy requirements.

[0022] The aforementioned quick-connect mechanism 5 includes a insertion hole 51 on the top of the insertion base 6 that matches the outer diameter of the output shaft. A locking groove 52 is provided on the inner wall of the insertion hole 51. It also includes a spring-loaded locking block 53 on the output shaft that matches the locking groove 52. When installing the inclinometer sensor 7, simply align the insertion hole 51 of the insertion base 6 with the output shaft, and align the locking groove 52 with the spring-loaded locking block 53. Then, insert the insertion base 6 onto the output shaft. When it reaches the predetermined position, the spring-loaded locking block 53 springs into the locking groove 52 to lock the position. At this time, the insertion base 6 and the central axis of the output shaft remain perpendicular to each other. For disassembly, simply press the spring-loaded locking block 53 and pull the insertion base 6 outwards. This mechanism makes the installation and adjustment of the inclinometer sensor more convenient. After installation, the inclinometer sensor 7 is firmly fixed, effectively preventing positional shift due to vibration or other external forces during use, thus improving the overall stability of the equipment.

[0023] The bottom of the aforementioned insertion base 6 is provided with two insertion slots 61 that are adapted to the top connecting piece 71 of the inclinometer sensor 7. The two insertion slots 61 intersect each other to form a cross-shaped structure. Each insertion slot 61 has threaded holes 62 on both sides for fixing the connecting piece 71. During installation, the top connecting piece 71 of the inclinometer sensor 7 is inserted into one of the insertion slots 61, and the screw is screwed into the threaded hole 62 to fix it. Because it has two mounting positions, this utility model can be used for the calibration of biaxial inclinometer sensors.

[0024] During operation, the device is securely fixed to a horizontal base. Handwheel 3 is rotated to check the worm gear reduction mechanism for flexible rotation. Then, the inclinometer 7 is installed on the insert 6, and the insert 6 is installed on the output shaft. Next, handwheel 3 is slowly and uniformly rotated at 3° intervals to rotate the inclinometer 7. The output data of the inclinometer 7 is read and recorded using a reading instrument. At each predetermined interval (e.g., 3°, 6°, 9°, etc.), after the reading instrument data stabilizes, the angle value displayed on the reading instrument (A1) and the actual rotation angle value read from the angle measuring ruler 4 (A2) are recorded respectively. Multiple points are continuously rotated (e.g., from 0° to +15°), and then the rotation is reversed for measurement (from 0° to -15°) to obtain the reciprocating motion performance of the sensor. The recorded data (A1, A2) are compared and the error is calculated to complete the calibration and verification of the inclinometer's accuracy.

[0025] This invention can improve the installation efficiency of inclinometer sensors. During the calibration process, only the handwheel needs to be turned to precisely control the rotation of the output shaft, realizing continuous adjustment of the inclinometer sensor at different angles. This effectively simplifies the complex adjustment steps of traditional processes, eliminates the need for tedious manual operation, thereby reducing manual operation errors and improving calibration accuracy.

[0026] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A device for calibrating inclinometer sensors at construction sites, characterized in that: The device includes a housing, within which a worm gear reduction mechanism is installed. The worm gear reduction mechanism includes a horizontally arranged input shaft and an output shaft. The end of the input shaft is equipped with a handwheel located outside the housing. An angle measuring scale is installed at the connection between the output shaft and the housing. The end of the output shaft extends outside the housing and is connected to a mounting base via a quick-connect mechanism. The bottom of the mounting base is provided with two mounting slots that are adapted to the connecting piece at the top of the inclinometer sensor. The mounting slots intersect each other to form a cross-shaped structure. Each mounting slot has threaded holes on both sides for fixing the connecting piece.

2. The device for calibrating inclinometer sensors at construction sites according to claim 1, characterized in that: The worm gear reducer adopts a two-stage worm gear reducer, including a first-stage worm coaxially arranged with the input shaft, a first-stage worm gear meshing with the first-stage worm on one side, a vertical connecting rod at the center of the first-stage worm gear, the vertical connecting rod being coaxially arranged with the second-stage worm, a second-stage worm gear meshing with the second-stage worm on one side, and the output shaft at the center of the second-stage worm gear.

3. The device for calibrating inclinometer sensors at construction sites according to claim 2, characterized in that: The lead angle of the first-stage worm is less than or equal to the equivalent friction angle between the first-stage worm wheel and the first-stage worm material, and the lead angle of the second-stage worm is less than or equal to the equivalent friction angle between the second-stage worm wheel and the second-stage worm material.

4. The device for calibrating inclinometer sensors at construction sites according to claim 2, characterized in that: The housing is a structure that is large at both ends and small in the middle, adapted to the worm gear reduction mechanism. It includes an upper shell for accommodating the first-stage worm and the first-stage worm wheel, a holding cylinder for accommodating the vertical connecting rod, and a lower shell for accommodating the second-stage worm and the second-stage worm wheel.

5. The device for calibrating inclinometer sensors at construction sites according to claim 1, characterized in that: The handwheel and angle measuring scale are respectively located at both ends of the housing. The angle measuring scale includes a fixed disk set on the housing and a rotating disk set on the output shaft. The fixed disk is a full-circle scale with a graduation value of 1°. The rotating disk has a ring structure and is equipped with a vernier scale. The vernier scale has n equal divisions. The total angle of the vernier scale is (n-1)° on the fixed disk, and a pointer is set at the 0 position of the vernier scale.

6. The device for calibrating inclinometer sensors at construction sites according to claim 1, characterized in that: The quick-connect mechanism includes a plug hole on the top of the plug seat that matches the outer diameter of the output shaft, a snap-fit ​​groove on the inner wall of the plug hole, and a spring clip on the output shaft that matches the snap-fit ​​groove.

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