A deflection detection system and a deflection detection method

Abstract

The application discloses a deflection detection system and a deflection detection method. The deflection detection system comprises a laser emitting device and a deflection detection device. The laser emitting device is used to be installed to the lower end of the fixed end of a guide beam and emits laser towards the suspended end of the guide beam. The deflection detection device comprises a first installation structure used to be installed to the lower end of the suspended end of the guide beam, a laser receiving assembly and a dial gauge assembly installed on the first installation structure. The first installation structure comprises a main body and a first magnetic attraction structure installed on the upper end of the main body. The first magnetic attraction structure is used to be adsorbed to the lower end of the suspended end of the guide beam to fix the deflection detection device. A containing cavity is arranged in the main body. A first jacking structure is arranged in the containing cavity. The laser receiving assembly and the dial gauge assembly are installed on the first jacking structure. The application aims to provide a deflection detection system which is convenient to disassemble and assemble.

Description

Technical Field

[0001] This invention relates to the field of deflection detection technology, specifically to a deflection detection system and a deflection detection method. Background Technology

[0002] During the erection of the steel box girder, the guide beam is suspended at one end, inevitably resulting in deflection deformation. Deflection deformation is the most direct reflection of structural stiffness, a macroscopic manifestation of structural safety, and an important indicator of safety assurance.

[0003] Currently, the commonly used equipment for detecting deflection deformation, i.e., the deformation of relative displacement of a structure, includes dial gauges, levels, electronic rulers, and continuous static levels. Manual on-site measurement is simple, convenient, and highly accurate. However, manual methods are unsuitable during the box girder laying process when the guide beam is suspended. Furthermore, existing laser measurement and imaging methods both require the installation of detection devices on the guide beam, which is cumbersome. Therefore, there is an urgent need for a deflection detection system that can effectively detect the deflection deformation at the end of the guide beam and is easy to install and remove. Summary of the Invention

[0004] The main objective of this invention is to provide a deflection detection system and a deflection detection method, aiming to offer a deflection detection system that is easy to assemble and disassemble.

[0005] To achieve the above objectives, the present invention proposes a deflection detection system for detecting the deflection of the suspended end of a guide beam, wherein the deflection detection system comprises:

[0006] A laser emitting device for mounting to the lower end of a fixed end of a guide beam and emitting a laser beam toward the suspended end of the guide beam; and,

[0007] The deflection detection device includes a first mounting structure for mounting to the lower end of the suspension end of a guide beam, and a laser receiving assembly and a dial indicator assembly mounted on the first mounting structure.

[0008] The first mounting structure includes a main body and a first magnetic attraction structure mounted on the upper end of the main body. The first magnetic attraction structure is used to attract the lower end of the suspension end of the guide beam to fix the deflection detection device. A receiving cavity is opened inside the main body, and a measuring port connecting the receiving cavity to the outside is opened on the top of the main body. A receiving port connecting the receiving cavity to the outside is opened on the side of the main body. A first lifting structure is provided in the receiving cavity. The laser receiving component and the dial indicator component are mounted on the first lifting structure, and the receiving end of the laser receiving component is set corresponding to the receiving port. The dial indicator component passes through the measuring port to support the lower end of the guide beam for measurement.

[0009] Optionally, the first lifting structure includes:

[0010] A movable base for supporting the laser receiving assembly and the dial indicator assembly; and,

[0011] The drive screw assembly includes a screw extending vertically within the accommodating cavity and a drive member for rotating the screw. The screw passes through the movable seat and is screwed to the movable seat to drive the movable seat to move vertically.

[0012] Optionally, the movable seat is circular, and the drive screw assembly has at least three screws arranged in a ring around the movable seat;

[0013] The movable seat is also equipped with a tilt sensor, which is used in conjunction with the drive screw assembly to maintain the horizontal state of the movable seat.

[0014] Optionally, the movable seat is provided with a ball joint structure corresponding to the position of the screw. The ball joint structure includes a hinge seat extending vertically and a ball joint installed in the hinge seat. The ball joint is provided with a threaded through hole, and the screw passes through the threaded through hole.

[0015] Optionally, the magnetic attraction structure includes at least three magnetic attractors arranged in a ring around the upper end of the main body, and each of the magnetic attractors is spaced apart in the horizontal plane between the two drive screw assemblies.

[0016] Optionally, the receiving end of the laser receiving component includes a plurality of photosensitive components arranged in a linear array, and the plurality of photosensitive components form a baseline extending in a horizontal direction.

[0017] Optionally, the first lifting structure is further provided with a camera device for acquiring images of the dial of the dial indicator assembly and the receiving end of the laser receiving assembly.

[0018] Optionally, the laser emitting device includes:

[0019] Laser emitting components; and,

[0020] The second mounting structure includes a mounting body and a second magnetic structure mounted on the upper end of the mounting body. The second magnetic structure is used to attract to the lower end of the fixed end of the guide beam. The mounting body is provided with a second lifting structure, and the laser emitting component is mounted on the second lifting structure to adjust the height of the emitted laser.

[0021] Optionally, the laser emitting assembly includes a laser emitter and a rotating device that carries the laser emitter, the rotating device comprising:

[0022] A turntable, which carries the laser emitter, is rotatably mounted on the second lifting structure. An annular groove is formed at the lower end of the turntable, and the groove wall of the annular groove is provided with teeth. A drive gear is mounted on the second lifting structure, and the drive gear extends into the groove and meshes with the teeth to drive the turntable to rotate.

[0023] This invention also proposes a deflection detection method based on the above-mentioned deflection detection system, wherein the steps of the deflection detection method include:

[0024] When the guide beam is installed onto the box girder, the laser emitting device is installed at the lower end of the guide beam fixed to the box girder, and the deflection detection device is installed at the lower end of the guide beam's suspended end.

[0025] Adjust the first lifting structure until the dial indicator assembly returns to zero;

[0026] Adjust the height of the laser emitted by the laser emitting device and its relative orientation to the deflection detection device until the laser receiving component on the deflection detection device receives the laser emitted by the laser emitting device;

[0027] Perform the box girder installation steps until the guide beam is suspended at the suspension end, and control the first lifting structure to lift it to maintain the laser receiving component receiving the laser emitted by the laser emitting device;

[0028] Obtain the dial indicator assembly readings to calculate the deflection at the suspended end of the guide beam.

[0029] In the technical solution of this invention, when the guide beam is not suspended, the laser emitting device and the deflection detection device are installed at the fixed end and suspended end of the guide beam, respectively. The installation method at this time is magnetic attraction, specifically using either a permanent magnet or an electromagnet, to facilitate their installation and disassembly. Then, the laser emitted by the laser emitting device is received by the laser receiving component to determine the height of the deflection detection device. At this time, the reading of the dial indicator component is recorded, or the dial indicator component is adjusted to zero. Then, when deflection deformation occurs after the guide beam is suspended, it must be due to the suspended end of the guide beam sinking. The first lifting structure lifts the laser receiving component and the dial indicator component until the laser receiving component receives the laser emitted by the laser emitting device again, thus completing the height positioning. At this point, the height of the dial indicator component is consistent with the initial height, and the difference between the reading of the dial indicator component and the initial reading is the deformation of the suspended end of the guide beam. This design makes the deflection detection system simple, practical, and easy to install and disassemble, thus enhancing its usability. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 A perspective view of an embodiment of the laser emitting device provided by the present invention;

[0032] Figure 2 This is a perspective view of an embodiment of the deflection detection device provided by the present invention;

[0033] Figure 3 for Figure 1 A cross-sectional schematic diagram of the rotating device in the diagram;

[0034] Figure 4 for Figure 2 A partial cross-sectional diagram of the movable seat in the middle;

[0035] Figure 5 A schematic diagram illustrating the application of the deflection detection system provided by this invention on a guide beam;

[0036] Figure 6 This is a schematic flowchart illustrating the steps of the deflection detection method provided by the present invention.

[0037] Explanation of icon numbers:

[0038] label name label name 1000 Deflection Detection System 2111 Container cavity 1 Laser emitting device 2112 Measuring port 11 Laser emitting components 2113 Receiver 111 laser emitter 212 First magnetic structure 112 Rotating device 22 Laser receiver component 1121 turntable 23 Dial gauge components 1122 Drive gear 24 First lifting structure 12 Second installation structure 241 Activity Seat 121 Installation main body 2411 Hinge 122 Second magnetic structure 2412 Ball hinge 123 Second lifting structure 242 Drive screw assembly 2 Deflection detection device 2421 screw 21 First installation structure 2422 Drive components 211 main body

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] During the erection of the steel box girder, the guide beam is suspended at one end, inevitably resulting in deflection deformation. Deflection deformation is the most direct reflection of structural stiffness, a macroscopic manifestation of structural safety, and an important indicator of safety assurance.

[0044] Currently, the commonly used equipment for detecting deflection deformation, i.e., the deformation of relative displacement of a structure, includes dial gauges, levels, electronic rulers, and continuous static levels. Manual on-site measurement is simple, convenient, and highly accurate. However, manual methods are unsuitable during the box girder laying process when the guide beam is suspended. Furthermore, existing laser measurement and imaging methods both require the installation of detection devices on the guide beam, which is cumbersome. Therefore, there is an urgent need for a deflection detection system that can effectively detect the deflection deformation at the end of the guide beam and is easy to install and remove.

[0045] In view of this, the present invention provides a deflection detection system. Figures 1 to 5 The following is an embodiment of the deflection detection system provided by the present invention, and will be described in conjunction with specific accompanying drawings.

[0046] Please see Figures 1 to 5The deflection detection system 1000 is used to detect the deflection of the suspended end of the guide beam. The system includes a laser emitting device 1 and a deflection detection device 2. The laser emitting device 1 is mounted to the lower end of the fixed end of the guide beam and emits a laser beam towards the suspended end of the guide beam. The deflection detection device 2 includes a first mounting structure 21 mounted to the lower end of the suspended end of the guide beam, a laser receiving assembly 22 mounted on the first mounting structure 21, and a dial indicator assembly 23. The first mounting structure 21 includes a main body 211 and a first magnetic attraction structure 212 mounted on the upper end of the main body 211. The first magnetic attraction structure 212 is used to attract the suspended end of the guide beam. The lower end of the deflection detection device 2 is fixed. A receiving cavity 2111 is opened inside the main body 211, and a measuring port 2112 connecting the receiving cavity 2111 to the outside is opened on the top of the main body 211. A receiving port 2113 connecting the receiving cavity 2111 to the outside is opened on the side of the main body 211. A first lifting structure 24 is provided in the receiving cavity 2111. The laser receiving component 22 and the dial indicator component 23 are installed on the first lifting structure 24, and the receiving end of the laser receiving component 22 is set corresponding to the receiving port 2113. The dial indicator component 23 passes through the measuring port 2112 to support the lower end of the guide beam for measurement.

[0047] In the technical solution of this invention, when the guide beam is not suspended, the laser emitting device 1 and the deflection detection device 2 are installed to the fixed end and the suspended end of the guide beam, respectively. The installation method at this time is magnetic attraction, specifically using a permanent magnet or an electromagnet, to facilitate their installation and disassembly. Then, the laser emitted by the laser emitting device 1 is received by the laser receiving component 22 to locate the height of the deflection detection device 2. At this time, the reading of the dial indicator component 23 is recorded or adjusted to zero. Then, when deflection deformation occurs after the guide beam is suspended, it must be due to the suspended end of the guide beam sinking. The first lifting structure 24 lifts the laser receiving component 22 and the dial indicator component 23 until the laser receiving component 22 receives the laser emitted by the laser emitting device 1 again, thus completing the height positioning. At this time, the height of the dial indicator component 23 is consistent with the initial height, so the difference between the reading of the dial indicator component 23 and the initial reading is the deformation of the suspended end of the guide beam. This design makes the deflection detection system 1000 simple, practical, easy to install and remove, and more practical.

[0048] Specifically, the first lifting structure 24 includes a movable seat 241 and a drive screw assembly 242. The movable seat 241 is used to support the laser receiving assembly 22 and the dial indicator assembly 23. The drive screw assembly 242 includes a screw 2421 extending vertically within the accommodating cavity 2111 and a drive member 2422 for rotating the screw 2421. The screw 2421 passes through the movable seat 241 and is screwed to the movable seat 241 to drive the movable seat 241 to move up and down. During the lifting process, the laser receiving assembly 22 and the dial indicator assembly 23 need to be stably positioned to ensure stable cooperation with the laser emitting device 1 and stable detection of the guide beam. The lifting process also needs to be stable to avoid deviation caused by vibration, thereby avoiding affecting the detection accuracy. Therefore, in this embodiment, the drive screw assembly 242 and the movable seat 241 are combined, with the screw 2421 rotating to drive the movable seat 241 to move up and down to meet the above requirements.

[0049] Furthermore, the movable seat 241 is circularly arranged, and at least three drive screw assemblies 242 are arranged in a ring around the movable seat 241; the movable seat 241 is also provided with an tilt sensor, which is used to cooperate with the drive screw assembly 242 to maintain the horizontal state of the movable seat 241. To ensure proper pairing of the laser emitting device 1 and the laser receiving component 22, and to guarantee the accuracy of vertical deflection detection of the guide beam, the horizontal state of the movable seat 241 must be maintained. Therefore, in this embodiment, multiple drive screw assemblies 242 are used to drive the movable seat 241 up and down, arranged around the movable seat 241. By adjusting the rotation amplitude of different screws 2421, the tilt of the movable seat 241 can be adjusted, thereby achieving horizontal adjustment of the movable seat 241. It is understood that the more drive screw assemblies 242 there are, the more complex the control becomes, but the better the leveling effect. In this embodiment, three drive screw assemblies 242 are used to achieve horizontal adjustment with the fewest possible number, simplifying control and reducing costs. For this purpose, an tilt sensor is provided on the movable seat 241 to detect and provide feedback on the horizontality of the movable seat 241, so as to cooperate with the drive screw assemblies 242 to complete the leveling of the movable seat 241.

[0050] Furthermore, the movable seat 241 is provided with a ball joint 2412 structure corresponding to the position of the screw 2421. The ball joint 2412 structure includes a hinge seat 2411 extending vertically and a ball joint 2412 installed within the hinge seat 2411. The ball joint 2412 is provided with a threaded through hole, and the screw 2421 passes through the threaded through hole. During the leveling process of the movable seat 241, the screw 2421 and the movable seat 241 may tilt at a certain angle. For example, if one screw 2421 rotates a large range while the other two screws 2421 rotate a small range, the angle between the screw 2421 and the movable seat 241 will change. Although the tilt angle is small, there will still be contact wear between the screw 2421 and the movable seat 241, and in severe cases, the movable seat 241 may become stuck and unable to move. Therefore, in this embodiment... The movable seat 241 is provided with a ball joint 2412 structure, and the screw 2421 passes through the ball joint 2412. The ball joint 2412 is hinged to the hinge seat 2411. When the screw 2421 rotates, it drives the ball joint 2412 up and down, thereby driving the movable seat 241 up and down. The ball joint 2412 can rotate within the hinge seat 2411, thereby avoiding contact wear between the screw 2421 and the movable seat 241 when there is an inclination angle between the movable seat 241 and the screw 2421.

[0051] Furthermore, the magnetic attraction structure includes at least three magnetic attractors arranged in a ring around the upper end of the main body 211, with each magnetic attractor spaced apart between two drive screw assemblies 242 in a horizontal plane. The magnetic force of the magnetic attraction structure exerts resistance on the movement of the drive screw assembly 242, potentially affecting its rotational accuracy. Therefore, in this embodiment, the magnetic attractors are misaligned with the drive screw assembly 242 to reduce the influence of the magnetic force on the drive element 2422 within the drive screw assembly 242, thereby avoiding any impact on the rotation of the screw 2421.

[0052] Furthermore, the receiving end of the laser receiving component 22 includes multiple photosensitive components arranged in a linear array, and these multiple photosensitive components form a baseline extending horizontally. To increase the probability of laser capture, reduce the difficulty of capture, and prevent the laser receiving component 22 from losing its target, the receiving end of the laser receiving component 22 is configured with multiple photosensitive components arranged in a linear array, so that the laser can be captured when it shines on one of the photosensitive components. Based on this, the multiple photosensitive components arranged in the horizontal direction are used as a baseline as a height reference for laser positioning. When the guide beam is not suspended, the laser is aligned with the baseline. After suspension, when the laser receiving component 22 captures the laser, the height of the laser receiving component 22 is adjusted so that the laser is aligned with the baseline again, thereby completing the pairing of the laser emitting device 1 and the deflection detection device 2, and then the deflection of the guide beam is obtained by reading the dial indicator component 23. It should be noted that the reference on the laser receiving component 22 can also be set as a reference point, which can be used as a height reference for pairing the laser emitting device 1 and the deflection detection device 2. In this embodiment, a baseline is used for alignment, which can still complete the height calibration when horizontal offset occurs, reducing the difficulty of laser alignment, reducing the laser alignment time, and improving the detection efficiency.

[0053] Furthermore, the first lifting structure 24 is also equipped with a camera device for acquiring images of the dial of the dial indicator assembly 23 and the receiving end of the laser receiving assembly 22. By providing the camera device on the first lifting structure 24, on the one hand, a regular dial indicator can be used for measurement, and the reading can be obtained through the camera device; on the other hand, the camera device can acquire the position of the laser irradiation on the laser receiving assembly 22, so as to assist in laser capture when the laser receiving assembly 22 fails to capture the laser, further reducing the difficulty of laser alignment, reducing laser alignment time, and improving detection efficiency.

[0054] Furthermore, the laser emitting device 1 includes a laser emitting assembly 11 and a second mounting structure 12. The second mounting structure 12 includes a mounting body 121 and a second magnetic attraction structure 122 mounted on the upper end of the mounting body 121. The second magnetic attraction structure 122 is used to attract to the lower end of the fixed end of the guide beam. A second lifting structure 123 is provided on the mounting body 121, and the laser emitting assembly 11 is mounted on the second lifting structure 123 to adjust the height of the emitted laser. The laser emitting device 1 is also installed magnetically for easy assembly and disassembly. Moreover, the second lifting structure 123 on the mounting body 121 allows the height of the laser emitting assembly 11 to be adjusted when the guide beam is not suspended, thus facilitating the pairing of the laser emitting assembly 11 with the laser receiving assembly 22.

[0055] It should be noted that in this embodiment, the specific structure of the second mounting structure 12 is the same as that of the first mounting structure 21. That is, since the second mounting structure 12 adopts all the technical solutions of the first mounting structure 21, it has at least all the beneficial effects brought about by the technical solutions of the first mounting structure 21, which will not be described in detail here.

[0056] Furthermore, the laser emitting assembly 11 includes a laser emitter 111 and a rotating device 112 that carries the laser emitter 111. The rotating device 112 includes a turntable 1121, which carries the laser emitter 111 and is rotatably mounted on the second lifting structure 123. An annular groove is formed at the lower end of the turntable 1121, and the groove wall of the annular groove is provided with teeth. A drive gear 1122 is mounted on the second lifting structure 123, and the drive gear 1122 extends into the groove and meshes with the teeth to drive the turntable 1121 to rotate. The laser emitter 111 is mounted on the rotating device 112, so that the rotating device 112 can drive the laser emitter 111 to rotate, thereby forming a fan-shaped coverage area with the emitted laser. This increases the probability that the laser will be captured by the laser receiving component 22. After the laser receiving component 22 captures the laser, it only needs to calibrate the height. That is, it is not necessary to control the rotating device 112 to stop to position the laser at the receiving end of the laser receiving component 22. The height calibration of the laser receiving component 22 and the laser emitter 111 can be completed during the rotation of the rotating device 112. The operation process is simple, easy to implement, and quite practical.

[0057] Please see Figure 6 The present invention also proposes a deflection detection method based on the deflection detection system 1000 described above, wherein the steps of the deflection detection method include:

[0058] S10: When the guide beam is installed onto the box girder, the laser emitting device 1 is installed at the lower end of the fixed end of the guide beam that is fixed to the box girder, and the deflection detection device 2 is installed at the lower end of the suspended end of the guide beam.

[0059] S20: Adjust the first lifting structure 24 until the dial indicator component 23 returns to zero;

[0060] S30: Adjust the height of the laser emitted by the laser emitting device 1 and its relative orientation with respect to the deflection detection device until the laser receiving component 22 on the deflection detection device 2 receives the laser emitted by the laser emitting device 1;

[0061] S40: Perform the box girder installation steps until the guide beam is suspended at the suspension end, and control the first lifting structure 24 to lift to maintain the laser receiving component 22 receiving the laser emitted by the laser emitting device 1;

[0062] S50: Obtain the reading of dial indicator assembly 23 to calculate the deflection at the suspended end of the guide beam.

[0063] By installing the deflection detection system 1000 when the guide beam is not suspended, and adjusting the pairing of the laser emitting device 1 and the deflection detection device 2, while resetting the dial indicator assembly 23 for subsequent readings, the preparation for deflection detection is completed. During the box girder installation step, the guide beam is gradually suspended, and the first lifting structure 24 follows the movement of the guide beam, lifting the laser receiving assembly 22 and the dial indicator assembly 23 to maintain the pairing of the laser receiving assembly 22 and the laser emitting device 1. At this time, the dial indicator assembly 23 gradually presses against the guide beam to obtain the offset value of the suspended end of the guide beam, thereby obtaining the deflection of the suspended end of the guide beam. Finally, during the guide beam removal process, the laser emitting device 1 and the deflection detection device 2 can be removed, making installation and removal convenient. The overall process is simple and practical, and does not require additional detection structures on the guide beam, such as tracks or fixing structures, making it widely applicable and low-cost.

[0064] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A deflection detection system for detecting the deflection of the suspended end of a guide beam, characterized in that, include: A laser emitting device is used to be installed at the lower end of the fixed end of the guide beam and to emit a laser towards the suspended end of the guide beam; as well as, The deflection detection device includes a first mounting structure for mounting to the lower end of the suspension end of a guide beam, and a laser receiving assembly and a dial indicator assembly mounted on the first mounting structure. The first mounting structure includes a main body and a first magnetic attraction structure mounted on the upper end of the main body. The first magnetic attraction structure is used to attract the lower end of the suspension end of the guide beam to fix the deflection detection device. A receiving cavity is opened inside the main body, and a measuring port connecting the receiving cavity to the outside is opened on the top of the main body. A receiving port connecting the receiving cavity to the outside is opened on the side of the main body. A first lifting structure is provided in the receiving cavity. The laser receiving component and the dial indicator component are mounted on the first lifting structure, and the receiving end of the laser receiving component is set corresponding to the receiving port. The dial indicator component passes through the measuring port to support the lower end of the guide beam for measurement.

2. The deflection detection system as described in claim 1, characterized in that, The first lifting structure includes: A movable base for supporting the laser receiving assembly and the dial indicator assembly; and, The drive screw assembly includes a screw extending vertically within the accommodating cavity and a drive member for driving the screw to rotate. The screw passes through the movable seat and is screwed to the movable seat to drive the movable seat to move vertically.

3. The deflection detection system as described in claim 2, characterized in that, The movable seat is circular, and the drive screw assembly has at least three screws arranged in a ring around the movable seat. The movable seat is also equipped with a tilt sensor, which is used in conjunction with the drive screw assembly to maintain the horizontal state of the movable seat.

4. The deflection detection system as described in claim 3, characterized in that, The movable seat is provided with a ball joint structure corresponding to the position of the screw. The ball joint structure includes a hinge seat extending vertically and a ball joint installed in the hinge seat. The ball joint is provided with a threaded through hole, and the screw passes through the threaded through hole.

5. The deflection detection system as described in claim 3, characterized in that, The magnetic attraction structure includes at least three magnetic attractors arranged in a ring around the upper end of the main body, and each of the magnetic attractors is spaced apart between the two drive screw assemblies in a horizontal plane.

6. The deflection detection system according to any one of claims 1 to 5, characterized in that, The receiving end of the laser receiving component includes a plurality of photosensitive components arranged in a linear array, and the plurality of photosensitive components form a baseline extending in a horizontal direction.

7. The deflection detection system according to any one of claims 1 to 5, characterized in that, The first lifting structure is also equipped with a camera device for acquiring images of the dial of the dial indicator assembly and the receiving end of the laser receiving assembly.

8. The deflection detection system as described in claim 1, characterized in that, The laser emitting device includes: Laser emitting components; and, The second mounting structure includes a mounting body and a second magnetic structure mounted on the upper end of the mounting body. The second magnetic structure is used to attract to the lower end of the fixed end of the guide beam. The mounting body is provided with a second lifting structure, and the laser emitting assembly is mounted on the second lifting structure to adjust the height of the emitted laser.

9. The deflection detection system as described in claim 8, characterized in that, The laser emitting assembly includes a laser emitter and a rotating device that carries the laser emitter. The rotating device includes: A turntable, which carries the laser emitter, is rotatably mounted on the second lifting structure. An annular groove is formed at the lower end of the turntable, and the groove wall of the annular groove is provided with teeth. A drive gear is mounted on the second lifting structure, and the drive gear extends into the groove and meshes with the teeth to drive the turntable to rotate.

10. A deflection detection method based on the deflection detection system according to any one of claims 1 to 9, characterized in that, The steps of the deflection detection method include: When the guide beam is installed onto the box girder, the laser emitting device is installed at the lower end of the guide beam fixed to the box girder, and the deflection detection device is installed at the lower end of the guide beam's suspended end. Adjust the first lifting structure until the dial indicator assembly returns to zero; Adjust the height of the laser emitted by the laser emitting device and its relative orientation to the deflection detection device until the laser receiving component on the deflection detection device receives the laser emitted by the laser emitting device; Perform the box girder installation steps until the guide beam is suspended at the suspension end, and control the first lifting structure to lift to maintain the laser receiving component receiving the laser emitted by the laser emitting device; Obtain the dial indicator assembly readings to calculate the deflection at the suspended end of the guide beam.

Images