Bolt installation laser-assisted positioning method

Abstract

The invention relates to the technical field of steelmaking roller way overhaul construction in the metallurgical industry, in particular to a laser-assisted positioning method for bolt installation. Comprising the following steps that connection between a roller way and a driving motor and a dry oil pipe are removed, and the roller way is hoisted to a storage site; bolts and slurry piers on the roller bed foundation are cleaned, and all the bolts are ensured to be intervisible; and the laser locator Z prints an elevation line parallel to the plane of the roller bed foundation, the elevations of all the bolts are measured, and the unified installation elevation of the bolts is determined by taking the mode of the measured values and combining the original design drawing and the elevations of the front and rear sections of foundations and considering the foundation settlement and the running stability of the steel billets. According to the method, the longitudinal datum line, the transverse datum line and the elevation datum line are established through the laser locator X, the laser locator Y and the laser locator Z respectively, a three-dimensional space positioning network is formed, it is ensured that the bolts are accurately aligned in the horizontal position, the perpendicularity and the height direction, and personal errors and position deviation caused by a traditional lofting method are remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of steelmaking roller conveyor maintenance and construction technology in the metallurgical industry, and more specifically, to a laser-assisted positioning method for bolt installation. Background Technology

[0002] In the steelmaking process, the slab roller conveyor in the steelmaking area serves as a key conveying equipment between continuous casting and hot rolling processes, undertaking the functions of transferring high-temperature steel billets and connecting processes. Due to the harsh working conditions of high temperature, heavy load, high humidity, and high dust, the roller conveyor system faces multiple technical challenges: First, the high temperature of the steel billets (the surface temperature often reaches above 900℃) causes significant thermal expansion of the roller bearings and transmission components, while also causing the lubricating medium to fail and exacerbating mechanical wear; Second, the weight of a single steel billet can reach tens of tons, and frequent start-stop and speed-changing operations cause fatigue damage to structural components; Third, the continuous peeling of the oxide scale on the surface of the steel billet during the conveying process, coupled with the intrusion of dust from the workshop environment into the roller conveyor gaps, further accelerates the erosion of moving parts and supporting structures; Fourth, the presence of cooling water spray or water mist in areas such as the secondary cooling section easily leads to corrosion of metal components and reduces the service life of the equipment.

[0003] To ensure production continuity and equipment reliability, severely damaged roller conveyors and their foundations need to be replaced periodically. Traditional maintenance methods typically involve removing the old roller conveyor, breaking up the original concrete foundation, recasting a new foundation and pre-embedding installation bolts, and then reinstalling the new roller conveyor. However, this process suffers from long construction cycles and difficulties in precision control. Especially in the bolt pre-embedding stage, traditional methods rely on manual layout and template positioning, which is not only inefficient but also susceptible to on-site vibration, temperature differences, and human error, leading to bolt position deviations and consequently affecting the installation accuracy and operational stability of the roller conveyor.

[0004] While current methods utilize total stations or GPS for positioning, these technologies are complex to operate and slow to respond in the high-temperature, high-humidity, and space-constrained environment of steelmaking workshops. This makes it difficult to meet the stringent requirements of compressed schedules and rapid resumption of production during annual maintenance. Therefore, there is an urgent need for a highly efficient, precise, and adaptable bolt positioning technology to shorten maintenance cycles and improve installation quality. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a laser-assisted positioning method for bolt installation, comprising the following steps:

[0006] Disconnect the roller conveyor from the drive motor and remove the dry oil pipe; hoist the roller conveyor to the storage site; clean the bolts and grout blocks on the roller conveyor foundation to ensure that all bolts are visible.

[0007] The laser positioning instrument Z projects an elevation line parallel to the plane of the roller conveyor foundation, measures the elevation of all bolts, takes the mode of the measured values ​​and combines them with the original design drawings and the elevations of the front and rear foundations, considers foundation settlement and billet running stability to determine the unified installation elevation of the bolts, calibrates and fixes the laser positioning instrument Z;

[0008] For the bolts arranged longitudinally on both sides of the roller conveyor foundation groove, use a laser positioning instrument X-ray to aim at the center of the bolts, so that most bolts are located on the X-ray path. Investigate the cause of the offset bolts, fine-tune and calibrate the laser positioning instrument X-ray, and then fix it, using its X-ray as the longitudinal calibration line.

[0009] A laser positioning instrument Y auxiliary installation bracket is welded to the columns on both sides of the roller conveyor foundation. After the laser positioning instrument Y is arranged, the parallelism of each group of bolts is measured to eliminate serious displacement. The laser positioning instrument Y is calibrated and fixed, and its ray is used as the transverse calibration line.

[0010] Remove the damaged concrete of the roller conveyor foundation, cut the reinforcing bars and re-install them, tie the reinforcing bars after setting up the formwork, turn on the laser positioning instrument X and laser positioning instrument Y, and embed the corrugated sleeve with the intersection of the two rays as the bolt pre-embedding position, and pour the new concrete foundation.

[0011] After the basic maintenance is completed, install the bolts. Use laser positioning instruments X and Y to calibrate the bolt center and use laser positioning instrument Z to confirm the consistency of the upper elevation of the screw rod, ensuring that the bolt is accurately positioned, the screw rod is perpendicular to the ground, and the length and height of the bolt from the foundation meet the standards.

[0012] The steel mesh was laid, the mold was installed, and CGM early-strength grouting material was used for secondary grouting and fixing.

[0013] Preferably, after cleaning the bolts and grout blocks, the elevation of each bolt is measured and the mode is taken. Combined with the original design drawings and the elevation of the foundation before and after, the unified installation elevation of the bolts is determined by considering the foundation settlement and the running stability of the steel billet. The laser positioning instrument Z is calibrated and fixed, and its elevation line is used as the height reference for subsequent foundation repair and bolt calibration.

[0014] Preferably, after the laser positioning device Z is fixed, the center of the bolt is aimed at the X-ray of the laser positioning device, the X-ray is adjusted so that most bolts are on the path, the cause of the deviation is investigated and fine-tuned and calibrated, and then the laser positioning device X is fixed. Its X-ray is used as a longitudinal calibration line to guide the longitudinal alignment of the bolts and the longitudinal positioning of the pre-embedded corrugated sleeve.

[0015] Preferably, based on the layout of fewer horizontal and more vertical bolts on both sides of the roller conveyor foundation groove, multiple sets of laser positioning instruments Y are arranged to cover each set of bolts through auxiliary installation brackets. After measuring the parallelism of the bolts and eliminating serious displacement, the laser positioning instruments Y are calibrated and fixed. The rays of the laser positioning instruments are used as the horizontal calibration lines, forming a cross-reference network with the vertical calibration lines to ensure accurate horizontal positioning of the bolts.

[0016] Preferably, after the laser positioning instruments X, Y, and Z are fixed, the damaged concrete is removed, the rebar is installed and the formwork is erected, and the laser positioning instruments X and Y are turned on when the rebar is tied. The intersection of the two rays is used to determine the bolt pre-embedded position and the corrugated sleeve is pre-embedded, so as to achieve accurate pre-reservation of hole positions before pouring.

[0017] Preferably, after the basic maintenance is up to standard, the bolts are installed. The center of the bolt is calibrated to the intersection of the two rays using laser positioning instruments X and Y, and the upper elevation of the bolt is calibrated to be level with the rays using laser positioning instrument Z, so as to ensure that the bolt positioning, verticality, length and height from the foundation all meet the standards.

[0018] Preferably, after the bolts are calibrated, steel mesh is laid according to the design, molds are installed, and CGM early-strength grout is used for secondary grouting to fill the gaps around the bolts. After curing, the bolts are finally fixed.

[0019] Preferably, throughout the entire construction process, the elevation line of the laser positioning instrument Z and the longitudinal and transverse calibration lines of the laser positioning instruments X and Y are always used as spatial position references, providing continuous positioning references in each step of foundation removal, rebar installation and pouring, bolt pre-embedding, installation calibration and secondary grouting, ensuring the construction accuracy and process continuity of each process.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. By using laser positioning instruments X, Y, and Z to establish three baselines for longitudinal, transverse, and elevation respectively, a three-dimensional spatial positioning network is formed to ensure that the bolts are precisely aligned in the horizontal, vertical, and height directions, significantly reducing human error and positional deviations caused by traditional layout methods.

[0022] 2. The three-dimensional laser reference line provides a continuous and consistent positioning reference throughout the construction process, ensuring precise connection between each process, avoiding cumulative errors caused by reference changes, improving the stability and reliability of the overall construction quality, and providing a solid and reliable foundation for the installation of roller conveyor equipment by precisely controlling the position, verticality, foundation length and elevation of bolts. This reduces equipment vibration, wear and failure caused by bolt deviation, extends equipment service life, and ensures the stability and continuity of billet conveying. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the laser positioning device in this invention;

[0024] Figure 2 This is a demonstration diagram of the use of the laser positioning device in this invention;

[0025] Figure 3 This is a layout diagram of the laser-assisted positioning technology in this invention.

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1. Laser positioning device X; 2. Laser positioning device Y; 3. Laser positioning device Z; 4. Bolts; 5. Roller conveyor foundation Detailed Implementation

[0028] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1-3 As shown, this embodiment provides a laser-assisted positioning method for bolt installation, applied in the repair construction of steelmaking roller conveyor foundations, to achieve high-precision and high-efficiency restoration of roller conveyor foundation bolt positioning, ensuring the stability and operational reliability of subsequent roller conveyor equipment installation, including the following steps:

[0030] S1. Preliminary preparation and foundation cleaning: Dismantle the mechanical connection and dry oil lubrication pipeline between the roller conveyor and the drive motor. Use lifting equipment to lift the roller conveyor as a whole to the designated storage site. Then, inspect the original roller conveyor foundation 5 and remove the old bolts 4 and grout blocks and other obstacles on it to ensure that the operators can see the position of the bolts 4 to be repaired or newly installed on the foundation 5, so as to provide unobstructed vision conditions for subsequent laser measurement and positioning.

[0031] S2, Elevation Benchmark Establishment: After cleaning, the laser positioning device Z3 is set up in a suitable position, and its attitude is adjusted so that the laser elevation line emitted is strictly parallel to the design plane of the roller conveyor foundation 5. The elevation line is used to measure the elevation of the existing bolts 4, obtain the measured values ​​of each point, and calculate the mode of the elevation data. Combined with the original design drawings and the elevation information of the adjacent front and rear foundation sections, and taking into account the possible settlement and deformation of the foundation and the stability requirements of the billet running on the roller conveyor, the unified installation elevation of the bolts 4 is finally determined. Based on this, the elevation line is calibrated, and the laser positioning device Z3 is firmly fixed to keep it stable throughout the construction process, serving as the height benchmark for subsequent processes.

[0032] S3, Longitudinal Calibration Line Setting: For the bolts 4 arranged longitudinally on both sides of the groove of the roller conveyor foundation 5, a laser positioning instrument X1 is set up so that its laser beam is aimed at the center of the bolts along the groove direction. By fine-tuning the position and angle of the laser positioning instrument X1, most of the bolts 4 are positioned on the laser beam path. For individual bolts 4 that deviate significantly from the beam, the reasons for their deviation are analyzed (such as foundation displacement, construction errors, etc.), and after eliminating abnormal factors, the laser positioning instrument X1 is finely calibrated. After calibration, it is fixed, and this laser beam serves as the calibration baseline for the longitudinal installation of the bolts 4.

[0033] S4, setting the transverse calibration line: Considering the characteristic that there are fewer transverse bolts 4 on both sides of the groove of the roller foundation 5 but more longitudinal columns, a special laser positioning instrument Y2 auxiliary installation bracket is welded on the columns on both sides of the roller foundation 5. Multiple sets of laser positioning instruments Y2 are arranged on the bracket so that their laser beams cover each set of transverse bolts 4. After the laser positioning instrument Y2 is turned on, the transverse parallelism between each set of bolts 4 is measured, and abnormal points with serious displacement or deformation are eliminated. Then, the direction of each laser positioning instrument Y2 is calibrated and fixed. Their respective beams together form a transverse calibration network to guide the precise control of the transverse position of the bolts 4.

[0034] S5, Foundation Repair and Pre-embedded Positioning: After setting the upper three-dimensional laser reference, the damaged concrete structure on the roller conveyor foundation 5 is removed using a chisel, and the original reinforcing bars are cut. Reinforcing bars are then re-installed according to specifications and connected to the newly installed reinforcing bars. Subsequently, formwork is erected and reinforcing mesh is tied. During this process, laser positioning devices X1 and Y2 are simultaneously activated. The intersection of their intersecting laser beams is used to precisely locate the pre-embedded position of each bolt 4, and corrugated sleeves are pre-embedded at the intersection points to reserve holes for subsequent bolt installation. After confirmation, new concrete is poured to form the repaired foundation structure.

[0035] S6, Bolt Installation and 3D Calibration: After the newly poured concrete has cured to the required strength, bolt 4 is installed. During the installation process, the center position of bolt 4 is precisely adjusted using the intersection of laser positioning instruments X1 and Y2. At the same time, the elevation line of laser positioning instrument Z3 is used to check whether the upper end of the bolt is level with the set elevation. Through the three-dimensional laser-assisted method, it is ensured that each bolt 4 is accurately positioned, has good verticality, consistent length from the foundation, and uniform height, thus meeting the technical requirements for equipment installation.

[0036] S7, Secondary grouting and fixing: After all bolts 4 are calibrated, steel mesh is laid according to design requirements and grouting mold is installed. CGM early strength grout is used to fill the gaps around bolts 4 with secondary grout. After the grout has cured, bolts 4 and roller foundation 5 form a solid integral structure, achieving the final high-precision fixing.

[0037] Throughout the entire construction process, the elevation line of laser positioning instrument Z3, the longitudinal calibration line of laser positioning instrument X1, and the transverse calibration line of laser positioning instrument Y2 serve as spatial three-dimensional positioning benchmarks. These benchmarks are used in all processes, including foundation removal, rebar installation and formwork, rebar tying, corrugated sleeve pre-embedding, concrete pouring, bolt installation, and secondary grouting. This effectively ensures the consistency of construction accuracy and the continuity of the process, significantly improving the quality and efficiency of roller conveyor foundation repair.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser-assisted positioning method for bolt installation, characterized in that, Includes the following steps: Disconnect the roller conveyor from the drive motor and the dry oil pipe, and hoist the roller conveyor to the storage site; clean the bolts (4) and grout blocks on the roller conveyor foundation (5) to ensure that all bolts (4) are visible. The laser positioning instrument Z (3) marks the elevation line parallel to the plane of the roller conveyor foundation, measures the elevation of all bolts (4), takes the mode of the measured value and combines it with the original design drawings and the elevation of the foundations of the front and rear sections, takes into account the foundation settlement and the running stability of the billet to determine the unified installation elevation of the bolts (4), calibrates and fixes the laser positioning instrument Z (3). For the bolts (4) arranged longitudinally on both sides of the groove of the roller foundation (5), use the laser positioning instrument X (1) to aim at the center of the bolts so that most of the bolts (4) are located on the ray path. Check the cause of the offset bolts (4) and finely adjust and calibrate the laser positioning instrument X (1) before fixing it, and use its ray as the longitudinal calibration line. A laser positioning instrument Y (2) auxiliary installation bracket is welded to the columns on both sides of the roller foundation (5). After the laser positioning instrument Y (2) is arranged, the parallelism of each group of bolts (4) is measured, serious displacement is eliminated, the laser positioning instrument Y (2) is calibrated and fixed, and its ray is used as the transverse calibration line. Remove the damaged concrete of the roller foundation (5), cut the reinforcing bars and re-plant the reinforcing bars, tie the reinforcing bars after setting up the formwork, turn on the laser positioning instrument X (1) and laser positioning instrument Y (2), and embed the corrugated sleeve at the intersection of the two rays as the pre-embedded position of the bolt (4), and pour the new concrete foundation. After the basic maintenance is up to standard, install the bolt (4), use laser positioning instrument X (1) and laser positioning instrument Y (2) to calibrate the center of the bolt (4), and use laser positioning instrument Z (3) to confirm the consistency of the upper elevation of the screw (4) to ensure that the bolt (4) is accurately positioned, the screw is perpendicular to the ground and the length and height of the foundation meet the standards; The steel mesh was laid, the mold was installed, and CGM early-strength grouting material was used for secondary grouting and fixing.

2. The laser-assisted positioning method for bolt installation according to claim 1, characterized in that: After cleaning the bolts (4) and the grout block, measure the elevation of each bolt (4) and take the mode. Combine the original design drawings and the elevation of the foundation before and after, and consider the foundation settlement and the stability of the billet operation to determine the unified installation elevation of the bolts (4). Calibrate and fix the laser positioning instrument Z (3) and use its elevation line as the height reference for subsequent foundation repair and bolt (4) calibration.

3. The laser-assisted positioning method for bolt installation according to claim 2, characterized in that: After the laser positioning instrument Z (3) is fixed, the laser positioning instrument X (1) is used to aim at the center of the bolt (4), and the ray is adjusted so that most of the bolts (4) are on the path. After checking the cause of the offset and fine-tuning the calibration, the laser positioning instrument X (1) is fixed and its ray is used as the longitudinal calibration line to guide the longitudinal alignment of the bolts (4) and the longitudinal positioning of the pre-embedded corrugated sleeve.

4. The laser-assisted positioning method for bolt installation according to claim 1, characterized in that: Based on the layout of the bolts (4) on both sides of the foundation groove of the roller conveyor (5) with fewer horizontal and more vertical bolts, multiple sets of laser positioning instruments Y (2) are arranged to cover each set of bolts (4) by auxiliary installation brackets. After measuring the parallelism of the bolts (4) and eliminating serious displacement, the laser positioning instruments Y (2) are calibrated and fixed. Its rays are used as the horizontal calibration lines to form a cross reference network with the vertical calibration lines to ensure accurate horizontal positioning of the bolts (4).

5. The laser-assisted positioning method for bolt installation according to claim 4, characterized in that: After the laser positioning instruments X (1), Y (2) and Z (3) are fixed, the damaged concrete is removed, the rebar is installed and the formwork is erected. When the rebar is tied, the laser positioning instruments X (1) and Y (2) are turned on to determine the pre-embedded position of the bolt (4) by the intersection of the two rays and the corrugated sleeve is pre-embedded to achieve accurate pre-reservation of the hole position before pouring.

6. The laser-assisted positioning method for bolt installation according to claim 5, characterized in that: After the basic maintenance is up to standard, the bolt (4) is installed. The center of the bolt (4) is calibrated to the intersection of the two rays by laser positioning instrument X (1) and laser positioning instrument Y (2). The upper elevation of the bolt (4) is calibrated to be level with the ray by laser positioning instrument Z (3) to ensure that the positioning, verticality, length and height of the bolt (4) meet the standards.

7. The laser-assisted positioning method for bolt installation according to claim 6, characterized in that: After the bolt (4) is calibrated, steel mesh is laid and mold is installed according to the design. CGM early strength grout is used for secondary grouting to fill the gaps around the bolt. After curing, the bolt (4) is finally fixed.

8. The laser-assisted positioning method for bolt installation according to claim 7, characterized in that: Throughout the construction process, the elevation line of the laser positioning instrument Z (3) and the longitudinal and transverse calibration lines of the laser positioning instruments X (1) and Y (2) are always used as spatial position references, providing continuous positioning references in each step of foundation removal, rebar installation and pouring, bolt (4) pre-embedding, installation calibration and secondary grouting, ensuring the construction accuracy and process continuity of each process.

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