Building wall verticality detection device

Abstract

This utility model relates to the field of detection device technology, and in particular to a building wall verticality detection device. It includes a base plate for overall stability, undulating platforms at all four corners of the base plate for overall balance and stability, a marking guide frame at the center of the base plate to increase laser intensity and adapt to the wall surface, and symmetrically arranged vertical calibration frames on the base plate for guided sliding to adapt to wall verticality detection. The undulating platforms dynamically adjust the airbag pressure via an air pump, and the support columns adapt to uneven ground, eliminating equipment swaying caused by wind or vibration. The triangular calibration block of the vertical calibration frame carries a laser ball, and combined with the scale adjustment of the support rod and the cylinder-driven sliding, it achieves multi-point synchronous scanning of the wall surface, accurately mapping the overall flatness of the wall. The first and second steering columns of the marking guide frame support 360° rotation scanning of the laser rangefinder. The magnetic base plate and detachable vertical calibration frame support rapid assembly, adapting to different building scenarios and improving the overall detection effect.

Description

Technical Field

[0001] This utility model relates to the field of detection device technology, and in particular to a device for detecting the verticality of building walls. Background Technology

[0002] The verticality of a building wall refers to the vertical relationship between the wall and the ground, i.e., the angle between them is 90 degrees. It is usually measured by the deviation value within the vertical height range. Generally, it is required that the vertical deviation of the wall surface within two meters should not exceed 5 millimeters. It is measured by hanging a plumb line or using a vertical measuring ruler. If the deviation value exceeds the range, it needs to be adjusted. Measuring tools include laser levels, vertical measuring rulers, etc., which can accurately detect the angular deviation between the wall surface and the baseline. Insufficient verticality may lead to uneven stress, affect the load-bearing capacity of the wall, and even cause safety hazards.

[0003] Traditional building wall verticality testing devices mostly use mechanical plumb lines, optical levels, or single tilt sensor structures. Their core principle relies on gravity sensing or optical projection, and verticality is judged by manually reading the scale or laser offset. Plumb lines are easily disturbed by wind, laser ranging fails under strong light, and they only measure local areas, which cannot reflect the overall flatness of the wall and reduce the overall usability. Utility Model Content

[0004] To overcome the limitations of traditional building wall verticality testing devices, which rely on manual reading of scales or laser offset to determine verticality, and which are susceptible to wind disturbances and laser ranging fails under strong light, this invention provides a building wall verticality testing device.

[0005] The technical solution is as follows: a building wall verticality detection device, including a base plate to maintain overall stability, undulating platforms at all four corners of the base plate to maintain overall balance and stability, a marking guide frame at the center of the base plate to increase laser intensity and adapt to the wall surface, and vertical calibration frames symmetrically arranged on the base plate to guide sliding and adapt to wall verticality detection.

[0006] Furthermore, the substrate has symmetrically provided guide grooves for sliding the vertical calibration frame, a shock-absorbing plate with a marking guide frame is installed in the center of the substrate, a display screen is provided on the substrate, a level is provided near the four corners of the substrate surface, and the substrate is covered with a shock-absorbing sleeve.

[0007] Furthermore, the bottom of the undulating platform is provided with several sets of support columns in a circumferential direction near the edge, the center of the undulating platform is provided with an air exchange box, the outer side of the air exchange box is provided with several sets of air exchange holes in a circumferential direction, the top of the air exchange box is provided with an air pump, the outer end of the air pump is provided with a signal module electrically connected to the level, the bottom of the air exchange box is connected with an air bladder, and the inside of the level is provided with an inclination sensor.

[0008] Furthermore, a central control box is connected to the middle of the marker guide frame, and a connecting box is connected to the top of the central control box. Mounting holes are provided at the four corners of both the connecting box and the central control box. A data screen is located in the center of the connecting box, and an infrared laser rangefinder electrically connected to the data screen is located in the center of the central control box. A wireless module is installed inside the infrared laser rangefinder. A first steering column is connected to the lower end of the central control box, and a protective sleeve is fitted on the outside of the first steering column. A rotator is connected to the bottom of the first steering column, and a first lithium battery pack electrically connected to the wireless module is electrically connected to the bottom of the rotator. The first lithium battery pack drives the rotator to rotate the first steering column. Steering boxes are provided at both ends of the marker guide frame.

[0009] Furthermore, several sets of matrix lights are distributed around the steering box, and a battery module electrically connected to the matrix lights is installed inside the steering box. A second steering column is provided between the steering box and the guide frame, and a second lithium battery pack is connected to the outer end of the second steering column. The second lithium battery pack drives the second steering column to rotate the steering box.

[0010] Furthermore, a support rod is provided at the center of the vertical calibration frame, and several sets of triangular calibration blocks are linearly arranged outside the vertical calibration frame. A fixed column is fixedly connected to the center of the triangular calibration block, and an adjustment frame is fitted at both ends of the fixed column. A third steering column is provided at the end of the adjustment frame away from the fixed column, which passes through the vertical calibration frame. A second drive motor is connected to the outer end of the third steering column. The second drive motor drives the third steering column to rotate the adjustment frame and the triangular calibration blocks. A positioning frame for positioning the second drive motor is provided on the vertical calibration frame.

[0011] Furthermore, the triangular calibration block is covered with a moisture-proof sleeve, and a laser ball is provided at the corner of the triangular calibration block. The laser ball contains a signal receiver and a wireless module. A floating plate is provided on one side of the triangular calibration block, and a pressure sensor electrically connected to the wireless module is provided inside the floating plate.

[0012] Furthermore, a connecting sleeve is fitted around the end of the support rod away from the vertical calibration frame. Several sets of scales are distributed circumferentially on the connecting sleeve. A connecting rod passing through the end of the support rod is located at the center of the connecting sleeve. A first drive motor is connected to the outer end of the connecting rod. The first drive motor electrically drives the connecting rod to adjust the support rod along the scale direction. A slider is fixed to the bottom of the connecting sleeve. A push rod passes through the center of the slider. One end of the push rod is connected to a cylinder. The cylinder drives the push rod to move the slider.

[0013] The beneficial effects are: This utility model uses an undulating platform to dynamically adjust the airbag pressure through an air pump, and the support column adapts to uneven ground to eliminate equipment shaking caused by wind or vibration. It also uses an infrared laser rangefinder and matrix light compensation technology to avoid strong light interference and support detection in nighttime or low-light environments.

[0014] The triangular calibration block of the vertical calibration frame is equipped with a laser ball. Combined with the scale adjustment of the support rod and the cylinder-driven sliding, it can realize multi-point synchronous scanning of the wall surface and accurately map the overall flatness of the wall.

[0015] The first and second steering columns of the marking guide support 360° rotation scanning of the laser rangefinder, while the magnetic substrate and detachable vertical calibration frame support rapid assembly, adapting to different building scenarios and improving the overall detection effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the building wall verticality detection device of this utility model;

[0017] Figure 2 This is a schematic diagram of the substrate of this utility model;

[0018] Figure 3 This is a schematic diagram of the undulating platform of this utility model;

[0019] Figure 4 This is a schematic diagram of the marking guide frame of this utility model;

[0020] Figure 5 This is a schematic diagram of the vertical calibration frame of this utility model.

[0021] In the attached drawings, the following are the reference numerals: 1. Base plate; 2. Elevation platform; 3. Marking guide frame; 4. Vertical calibration frame; 101. Guide groove; 102. Shock absorber plate; 103. Display screen; 104. Shock absorber sleeve; 105. Level; 201. Ventilation box; 202. Support column; 203. Airbag; 204. Ventilation hole; 205. Air pump; 301. Central control box; 302. Infrared laser rangefinder; 303. First steering column; 304. First lithium battery pack; 305. Protective sleeve; 306. Connecting box; 307. Mounting hole; 308. Number According to the screen; 309, second steering column; 310, steering box; 311, matrix light; 312, second lithium battery pack; 401, slider; 402, connecting sleeve; 403, scale; 404, first drive motor; 405, connecting rod; 406, push rod; 407, cylinder; 408, support rod; 409, positioning frame; 410, third steering column; 411, second drive motor; 412, adjustment frame; 413, triangular calibration block; 414, laser ball; 415, moisture-proof sleeve; 416, floating plate; 417, fixed column. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] The verticality of building walls is one of the core indicators for the quality acceptance of building projects, directly affecting the stability, safety, and service life of the building structure. Verticality refers to the perpendicular relationship between the wall and the ground, meaning the angle between them should be 90 degrees. Deviation is usually measured in terms of offset per unit height. For example, my country's "Standard for Acceptance of Construction Decoration and Renovation Engineering Quality" (GB50210-2018) clearly stipulates that the verticality deviation of ordinary masonry walls should not exceed 3 millimeters per meter, while the verticality requirements for high-rise buildings or prefabricated concrete structures are even stricter, typically needing to be controlled within 2 millimeters per meter. If the verticality does not meet the standard, it can lead to minor issues such as cracking of wall decoration materials and misaligned door and window installations, or more serious issues such as uneven structural stress, abnormal load distribution, and even major safety accidents like wall tilting or partial collapse.

[0024] Technical principles and limitations of traditional detection methods

[0025] For a long time, the detection of building wall verticality has mainly relied on a combination of manual operation and simple tools. Its technological evolution can be divided into the following stages:

[0026] Mechanical plumb line method

[0027] The plumb line method is the most primitive way to check verticality, based on the natural verticality of gravity. In operation, construction workers suspend a plumb bob at the top of the wall and visually judge the verticality deviation by measuring the distance between the plumb line and the wall surface. This method has extremely low tool costs (only a plumb bob and a string are needed), but it has significant drawbacks:

[0028] Environmental sensitivity: Plumb lines are easily affected by wind, vibration, and other disturbances, resulting in extremely poor stability during outdoor or high-altitude operations. For example, actual measurement data shows that when the wind speed reaches 5 m / s, the plumb line's swing amplitude can exceed 20 mm, leading to measurement errors of over 300%.

[0029] Significant subjective error: Relying on manual visual readings, the interpretation results vary considerably among different operators. Studies have shown that when three workers measure the same wall separately, the maximum difference in verticality deviation can reach 4 millimeters.

[0030] Inefficient: It can only perform single-point inspections. To cover an entire wall, the plumb bob needs to be moved multiple times. A complete inspection of a single wall (3 meters high) takes about 30 minutes.

[0031] Optical level and vertical measuring ruler

[0032] After the 1980s, optical levels gradually became widespread. Their core component is a high-precision bubble tube, which determines horizontal or vertical alignment by observing the bubble's position. Improved verticality gauges (such as a 2-meter straightedge) combined with wedge gauges can quantify vertical deviation. While these tools improved accuracy (error approximately ±1.5 mm / m), limitations still exist:

[0033] Limitations of localized inspection: A 2-meter straightedge can only reflect the verticality of a localized area within the inspection range and cannot capture fluctuations in the overall flatness of the wall. For example, if there is a 3-millimeter protrusion in the middle of a 10-meter-high wall, a traditional straightedge would need to be used to inspect it in sections at least 5 times to detect it, resulting in a high risk of missed detection.

[0034] Operation relies on experience: skilled workers need to repeatedly adjust the position of the straightedge, while novices are prone to measurement errors due to uneven force application. A real-world test case at a construction site showed that the results measured by a novice and a skilled worker on the same wall differed by as much as 2 millimeters.

[0035] Poor environmental adaptability: Optical levels have poor visibility in strong light or at night and cannot be used on curved or irregularly shaped walls.

[0036] Electronic single-point sensor stage

[0037] In the early 21st century, electronic tilt sensors and laser rangefinders were introduced into the field of verticality measurement. Typical devices, such as single-axis tiltmeters (e.g., the SICK DTS60), calculate verticality deviation by measuring the angle between the device and the direction of gravity, achieving an accuracy of ±0.5 mm / m. Laser levels (e.g., the Leica Lino L2) assist visual alignment by projecting a vertical laser line. However, these technologies still have systemic drawbacks:

[0038] Single-point data limitation: A single sensor can only acquire data from a single point, making it difficult to construct a global verticality model of the wall. A comparative study showed that the difference between single-point detection and panoramic scanning results could be as high as 8 millimeters (for wavy walls).

[0039] Uncompensated for dynamic interference: The sensor is not equipped with an anti-vibration algorithm, and even slight shaking of the equipment can cause data jumps. For example, in the vibration environment of a concrete pump truck pouring concrete, the laser line offset error can reach 3 mm.

[0040] Data silo problem: Inspection results are mainly stored locally, lacking real-time uploading and analysis functions, making it difficult to trace construction quality.

[0041] Industry pain points and technology upgrade needs

[0042] With the increasing complexity of building forms and the rising requirements for construction quality, the limitations of traditional testing methods are becoming increasingly apparent, specifically manifested in the following ways:

[0043] Testing challenges of high-rise and super high-rise buildings

[0044] The verticality of the walls of modern super high-rise buildings (such as those over 300 meters) needs to be controlled at the micrometer level, and traditional manual inspection cannot meet the time requirements. Taking a 632-meter-high skyscraper as an example, if a 2-meter straightedge is used for segment-by-segment inspection, the inspection of the core tube wall alone would require 12 workers to work continuously for 15 days, with labor costs exceeding 500,000 yuan. In addition, strong winds at high altitudes can cause plumb lines or laser instruments to malfunction, resulting in low reliability of the measured data.

[0045] Quality control requirements for prefabricated buildings

[0046] Precast concrete (PC) walls are manufactured in factories and assembled on-site. The verticality deviation at the joints directly affects the structural airtightness and seismic performance. Traditional methods cannot quickly detect the overall flatness of large-area spliced ​​walls. In one PC project, the cumulative effect of local deviations caused an entire wall layer to tilt by 7 millimeters, resulting in rework losses of 2 million yuan.

[0047] The meticulous requirements for the restoration of historical buildings

[0048] The walls of ancient brick-and-wood structures often exhibit natural deformation, requiring minor adjustments during restoration while preserving the original appearance. Traditional tools struggle to capture the millimeter-level deformation curves of historical structures. A restoration project of a Ming Dynasty brick wall, which resulted in overcorrection and loss of cultural relic value, sparked social controversy.

[0049] The Development Trend of Intelligent Construction

[0050] The widespread adoption of BIM (Building Information Modeling) and digital twin technologies necessitates the real-time integration of verticality data into construction management systems. Traditional offline inspection methods result in data lag, making dynamic adjustments impossible. In one smart construction site project, an 8-hour delay in inspection data led to a 10-millimeter increase in steel structure welding deviation, ultimately forcing the project to be cut and reassembled.

[0051] like Figure 1 - Figure 5 As shown, the building wall verticality detection device includes a base plate 1 for maintaining overall stability, undulating platforms 2 at all four corners of the base plate 1 for maintaining overall balance and stability, a marking guide frame 3 at the center of the base plate 1 to increase laser intensity and adapt to the wall surface, and a vertical calibration frame 4 symmetrically arranged on the base plate 1 for guiding and sliding adaptation to wall verticality detection.

[0052] Please see Figure 2 - Figure 4In this embodiment, the substrate 1 is symmetrically provided with guide grooves 101 for sliding of the vertical calibration frame 4. The center of the substrate 1 is provided with a shock-absorbing plate 102 for mounting the marking guide frame 3. The substrate 1 is provided with a display screen 103. The surface of the substrate 1 is provided with a level 105 near the four corners. The outer perimeter of the substrate 1 is covered with a shock-absorbing sleeve 104. The bottom of the undulating platform 2 is provided with several sets of support columns 202 in a circumferential manner near the edge. The center of the undulating platform 2 is provided with a ventilation box 201. The outer side of the ventilation box 201 is provided with several sets of ventilation holes 204 in a circumferential manner. The top of the ventilation box 201 is provided with an air pump 205. The outer end of the air pump 205 is provided with a signal module electrically connected to the level 105. The inside of the level 105 is provided with a tilt sensor. The bottom of the ventilation box 201 is connected with an airbag 203.

[0053] Please see Figure 3 - Figure 4 In this embodiment, a central control box 301 is connected to the middle of the marker guide frame 3, and a connecting box 306 is connected to the top of the central control box 301. Mounting holes 307 are provided at all four corners of the connecting box 306 and the central control box 301. A data screen 308 is located at the center of the connecting box 306, and an infrared laser rangefinder 302 (model SICK) is electrically connected to the data screen 308 at the center of the central control box 301. The DT50 infrared laser rangefinder 302 has an internal wireless module, model ESP32-WROOM-32E. The lower end of the central control box 301 is connected to a first steering column 303. A protective cover 305 is fitted on the outside of the first steering column 303. A rotator is connected to the bottom of the first steering column 303. The bottom of the rotator is electrically connected to a first lithium battery pack 304, which is electrically connected to the wireless module. The first lithium battery pack 304 drives the rotator to rotate the first steering column 303. Both ends of the marker guide frame 3 are equipped with steering boxes 310. Several sets of matrix lights 311 are distributed around the steering box 310. The steering box 310 contains a battery module electrically connected to the matrix lights 311. A second steering column 309 is provided between the steering box 310 and the marker guide frame. A second lithium battery pack 312 is connected to the outer end of the second steering column 309. The second lithium battery pack 312 drives the second steering column 309 to rotate the steering box 310.

[0054] Please see Figure 4 - Figure 5In this embodiment, a support rod 408 is provided at the center of the vertical calibration frame 4, and several sets of triangular calibration blocks 413 are linearly arranged outside the vertical calibration frame 4. A fixing post 417 is fixedly connected to the center of the triangular calibration block 413. Adjusting frames 412 are sleeved at both ends of the fixing post 417, and the adjusting frames 412 are away from the fixing post. 417 has a third steering column 410 that passes through the vertical calibration frame 4 at one end. The outer end of the third steering column 410 is connected to a second drive motor 411. The second drive motor 411 drives the third steering column 410 to rotate the adjusting frame 412 and the triangular calibration block 413. The vertical calibration frame 4 has a positioning frame 409 for positioning the second drive motor 411. The triangular calibration block 413 is covered with a moisture-proof sleeve 415. A laser ball 414 is provided at the corner of the triangular calibration block 413. The laser ball 414 contains a signal receiver, model Osram SFH 7050, with a wavelength of 850nm and a receiving angle of ±15°, adapted for infrared laser signal capture and wireless modules. A floating plate 416 is provided on one side of the triangular calibration block 413. The floating plate 416 contains a pressure sensor, model Honeywell, that is electrically connected to the wireless module. The TSC-30N has a connecting sleeve 402 fitted around the end of the support rod 408 away from the vertical calibration frame 4. Several sets of scales 403 are distributed circumferentially on the connecting sleeve 402. A connecting rod 405 passing through the end of the support rod 408 is provided at the center of the connecting sleeve 402. A first drive motor 404 is connected to the outer end of the connecting rod 405. The first drive motor electrically drives the connecting rod 405 to adjust the support rod 408 along the scale 403. A slider 401 is fixed to the bottom of the connecting sleeve 402. A push rod 406 passes through the center of the slider 401. One end of the push rod 406 is connected to a cylinder 407. The cylinder 407 drives the push rod 406 to move the slider 401.

[0055] The substrate 1 is attached to the wall. The level 105 of the undulating table 2 (with built-in tilt sensor, such as TE Connectivity SCL3300) detects the tilt angle of the substrate 1. The air pump 205 adjusts the air pressure of the airbag 203 through the air exchange box 201 to keep the substrate 1 horizontal.

[0056] The infrared laser rangefinder 302 of the marker guide frame 3 emits a laser beam, which rotates and scans the wall baseline through the first steering column 303, and the data screen 308 displays the initial verticality deviation in real time.

[0057] The cylinder 407 of the vertical calibration frame 4 is activated, and the push rod 406 drives the slider 401 to move along the guide groove 101, which in turn drives the support rod 408 and the triangular calibration block 413 to slide to the detection position.

[0058] The second drive motor 411 drives the third steering column 410 to adjust the angle of the triangular calibration block 413, so that the signal receiver of the laser ball 414 can capture the wall reflection signal and calculate the local verticality by combining the laser ranging data.

[0059] The pressure sensor inside the floating plate 416 detects the contact pressure. If an abnormally low pressure is detected (such as a hollow area), an alarm is triggered through the wireless module. The laser ball 414 signals of each triangular calibration block 413 and the data of the infrared laser rangefinder 302 are collected to the central control box 301 through the wireless module, and the display screen 103 displays each data synchronously.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting the perpendicularity of a building wall, comprising a base plate (1) which maintains the overall stability, characterized in that: It also includes undulating platforms (2) at all four corners of the substrate (1) to maintain overall balance and stability, a marking guide frame (3) at the center of the substrate (1) to increase laser intensity and adapt to the wall surface, and a vertical calibration frame (4) symmetrically arranged on the substrate (1) to perform guided sliding adaptation to wall verticality detection.

2. The device for detecting the perpendicularity of a building wall according to claim 1, wherein The substrate (1) is symmetrically provided with guide grooves (101) for sliding of the vertical calibration frame (4). The center of the substrate (1) is provided with a shock-absorbing plate (102) for mounting the marking guide frame (3). The substrate (1) is provided with a display screen (103). The surface of the substrate (1) is provided with a level (105) near the four corners. The outer perimeter of the substrate (1) is covered with a shock-absorbing sleeve (104).

3. The building wall verticality detection device according to claim 2, characterized in that, The bottom of the undulating platform (2) is provided with several sets of support columns (202) in a circumferential manner near the edge. The center of the undulating platform (2) is provided with a ventilation box (201). Several sets of ventilation holes (204) are provided in a circumferential manner on the outer side of the ventilation box (201). The top of the ventilation box (201) is provided with an air pump (205). The outer end of the air pump (205) is provided with a signal module that is electrically connected to the level ruler (105). The bottom of the ventilation box (201) is connected with an airbag (203). The inside of the level ruler (105) is provided with an inclination sensor.

4. The device for detecting the perpendicularity of a building wall according to claim 1, wherein A central control box (301) is connected to the middle of the marking guide frame (3), and a connecting box (306) is connected to the top of the central control box (301). Mounting holes (307) are provided at all four corners of the connecting box (306) and the central control box (301). A data screen (308) is provided in the center of the connecting box (306), and an infrared laser rangefinder (302) electrically connected to the data screen (308) is provided in the center of the central control box (301). The infrared laser rangefinder (302) is equipped with internal features. The device has a wireless module. The lower end of the central control box (301) is connected to a first steering column (303). A protective sleeve (305) is fitted on the outside of the first steering column (303). A rotator is connected to the bottom of the first steering column (303). The bottom of the rotator is electrically connected to a first lithium battery pack (304) that is electrically connected to the wireless module. The first lithium battery pack (304) drives the rotator to rotate the first steering column (303). Both ends of the marker guide frame (3) are equipped with steering boxes (310).

5. The device for detecting the perpendicularity of a building wall according to claim 4, wherein The steering box (310) is surrounded by several sets of matrix lights (311). Inside the steering box (310) is a battery module that is electrically connected to the matrix lights (311). A second steering column (309) is provided between the steering box (310) and the guide frame. A second lithium battery pack (312) is connected to the outer end of the second steering column (309). The second lithium battery pack (312) drives the second steering column (309) to rotate the steering box (310).

6. The device for detecting the perpendicularity of a building wall according to claim 1, wherein A support rod (408) is provided at the center of the vertical calibration frame (4). Several sets of triangular calibration blocks (413) are provided linearly outside the vertical calibration frame (4). A fixed column (417) is fixedly connected to the center of the triangular calibration block (413). An adjustment frame (412) is fitted at both ends of the fixed column (417). A third steering column (410) is provided at the end of the adjustment frame (412) away from the fixed column (417) and passes through the vertical calibration frame (4). A second drive motor (411) is connected to the outer end of the third steering column (410). The second drive motor (411) drives the third steering column (410) to drive the adjustment frame (412) and the triangular calibration block (413) to turn. A positioning frame (409) for positioning the second drive motor (411) is provided on the vertical calibration frame (4).

7. The device for detecting the perpendicularity of a building wall according to claim 6, wherein The triangular calibration block (413) is covered with a moisture-proof sleeve (415). A laser ball (414) is provided at the corner of the triangular calibration block (413). A signal receiver and a wireless module are provided inside the laser ball (414). A floating plate (416) is provided on one side of the triangular calibration block (413). A pressure sensor electrically connected to the wireless module is provided inside the floating plate (416).

8. The device for detecting the perpendicularity of a building wall according to claim 6, wherein A connecting sleeve (402) is fitted around the end of the support rod (408) away from the vertical calibration frame (4). Several sets of scales (403) are distributed circumferentially on the connecting sleeve (402). A connecting rod (405) passing through the end of the support rod (408) is provided at the center of the connecting sleeve (402). A first drive motor (404) is connected to the outer end of the connecting rod (405). The first drive motor electrically drives the connecting rod (405) to drive the support rod (408) to adjust along the scale (403). A slider (401) is fixed to the bottom of the connecting sleeve (402). A push rod (406) passes through the center of the slider (401). A cylinder (407) is connected to one end of the push rod (406). The cylinder (407) drives the push rod (406) to move the slider (401).

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