Edge beam type frame detection device and detection method

Abstract

The invention discloses a boundary beam type frame detection device, which comprises a detection platform at the bottom, an angle detection ruler, a thickness detection part at the upper part of the detection platform and a flatness detection assembly, the vehicle longitudinal beam groove angle is detected through the angle detection ruler; a vehicle frame assembly is placed on the detection platform, the vertical installation condition of the vehicle frame assembly is detected through the detection platform, and the thickness and flatness of a vehicle boundary beam are detected through the thickness detection component and the flatness detection component respectively. The invention further discloses a corresponding detection method. The overall stability and reliability of the frame assembly are improved, the service life of tires is prolonged, the maintenance cost of a vehicle is reduced, and operation is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile assembly and manufacturing, and more specifically, to a side beam type vehicle frame detection device and a detection method. Background Art

[0002] In the design and production of military special vehicles, the frame is the core load-bearing component of the entire vehicle, and its structural design and material selection are crucial to ensure the stability and load-bearing capacity of the vehicle. At present, many military special vehicles use a "side beam" structure. This structure uses special high-strength steel, combined with the internal structure design of multi-layer steel plates and support tubes, which can effectively support and connect various parts of the car, while bearing complex loads from inside and outside the car. However, in the actual production process, the existing detection methods have limitations in detecting the distortion and Y-direction deformation of the frame side beams. Specifically, for the fine detection of the distortion deformation of the frame side beams less than or equal to 2mm and the Y-direction deformation less than or equal to 5mm, the existing technology is difficult to provide accurate and reliable measurement results. This lack of detection capability not only affects the quality control of the frame, but may also cause the performance of the vehicle to decline under extreme conditions, and even endanger driving safety.

[0003] In order to solve these problems, some existing technologies provide a stable and light-controllable environment for detection by constructing a semi-enclosed darkroom box. Two LED light boxes are fixedly connected to the inner walls on both sides of the darkroom box to ensure the light intensity and uniformity of the detection area. At the same time, the upper camera bracket and the bottom camera bracket are arranged above and below the frame conveying device respectively. The upper camera bracket is equipped with an upper camera and a line laser sensor, and the bottom camera is fixed on the bottom camera bracket, so as to achieve a comprehensive detection of the frame longitudinal beam. However, the design and manufacture of the darkroom box need to ensure good sealing and light control to avoid the influence of external light on the detection results; in addition, the accuracy and stability of the camera and sensor are also key factors affecting the detection results, and regular calibration and maintenance are required. Therefore, the equipment use and maintenance costs will be relatively high, and the accuracy is also questionable. At the same time, the installation and debugging process of the device may be relatively complicated and requires professional technicians to operate. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a side beam type frame detection device and detection method, which realizes comprehensive quality monitoring of the frame assembly manufacturing process through integrated detection tools and detection methods; especially in terms of the flatness and deformation of the frame assembly, the overall stability and reliability of the frame assembly are ensured; the flatness of the frame side beams, the groove angle of the longitudinal beams, etc. are strictly controlled, which not only improves the skeleton accuracy of the frame, but also significantly reduces the assembly problems caused by frame deformation, providing a solid foundation for subsequent assembly processes, making the vehicle more stable and safe during driving; at the same time, the tire wear caused by frame deformation is reduced, the service life of the tire is extended, and the maintenance cost of the vehicle is reduced.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present invention, there is provided a side beam type frame detection device, comprising a detection platform at the bottom, an angle detection ruler, a thickness detection component and a flatness detection assembly at the upper part of the detection platform;

[0006] The angle of the vehicle longitudinal beam groove is detected by the angle detection ruler; the frame assembly is placed on the detection platform, the vertical installation condition of the frame assembly is detected by the detection platform, and the thickness and flatness of the vehicle side beam are respectively detected by the thickness detection component and the flatness detection component.

[0007] Furthermore, the detection platform includes a detection plane, a right-angle plate placed vertically on the upper part of the detection plane, and a pin slot fixedly connected to the right-angle plate; a plurality of pin holes matching the pin slot are arranged on the detection plane, and the right-angle plate is fixed to the detection plane by passing the pin through the pin slot and the pin hole in sequence.

[0008] Furthermore, there are several right-angle plates and bayonet slots with several sizes. The frame assembly is placed horizontally on the detection plane, and right-angle plates and bayonet slots of corresponding sizes are selected according to the structure of the frame assembly. The frame assembly is moved to fit with the right-angle plate fixed on the detection plane, and the vertical installation condition of the frame assembly is judged by observing the fit between the frame assembly and the right-angle plate.

[0009] Furthermore, the angle detection ruler is Y-shaped and includes a reference plate, an adjustment block matching the size of the upper slot of the reference plate, bolts and a movable plate; the adjustment block and the reference plate respectively have threaded holes matching the movable plate, and the movable plate is connected to the adjustment block and the movable plate is connected to the reference plate through the bolts.

[0010] Furthermore, the adjustment block has multiple models, and the angle measured by the angle detection ruler can be adjusted by placing the adjustment blocks of different sizes into the card slot of the reference plate.

[0011] Furthermore, the thickness detection component is a go / no-go gauge and is a shoe-shaped go / no-go gauge, and the size of the go / no-go gauge opening decreases from the opening inward to a set size.

[0012] Furthermore, the flatness detection assembly includes a flatness ruler, a flatness detection ruler and a special-shaped flatness detection ruler; the flatness ruler includes a front flange surface, a rear flange surface and a web surface that is perpendicular to and fixedly connected to the front flange surface and the rear flange surface. The front flange surface is fitted with the side beam, and the bottom of the front flange surface is fitted with the detection plane, and the plane flatness is judged by observing the contact between the rear flange surface and the detection plane.

[0013] Furthermore, the flatness detection ruler is U-shaped and includes a detection arm, a grip groove and a hand pad arranged on the same side of the detection arm; the detection arm has two and is arranged in parallel from the opening of the flatness detection ruler to the end of the closed side of the flatness detection ruler, and the size of the end is smaller than the opening.

[0014] Furthermore, the irregular flatness detection ruler comprises a handle on the top, a supporting bottom plate connected to the handle, and several irregular plates vertically connected to two parallel surfaces of the edge of the supporting bottom plate; the irregular flatness detection ruler has various sizes according to different spacings between the irregular plates, and the flatness of the side beam is detected by aligning several irregular plates with different planes of the side beam at the same time.

[0015] According to a second aspect of the present invention, a side beam type frame detection method is provided, which is implemented by using the side beam type frame detection device, and comprises the following steps:

[0016] S1, component preparation, cutting, stamping, bending and inspecting steel plates according to the frame structural parts required by the frame assembly, beveling with a beveling machine, and using the angle detection ruler to check the beveling angle at the longitudinal beam joint;

[0017] S2, equip the inspection platform, place the components prepared in S1 on the inspection platform for segmented welding; during the welding process, move the welded parts according to welding needs, fit the right-angle plate and the bayonet slot with the area being welded, observe the verticality of the welding, and modify the welding angle;

[0018] S3, thickness and flatness inspection, after completing the frame assembly of S2, the inner and outer pieces of the side beam are buckled together using a tooling positioning, and then welded and fixed after buckling, and then the thickness and flatness of the side beam are randomly inspected using the go and no-go gauge and the flatness ruler;

[0019] S4, special inspection for flatness, after the side beam cools to room temperature, the process is transferred, during which the flatness inspection ruler is used to inspect the distortion and deformation of the side beam; after the side beam is fully welded and formed, it is hoisted to the special inspection platform, and the flatness of the side beam is inspected using the flatness inspection ruler; the distortion and deformation of the side beam is inspected using the special-shaped flatness inspection ruler;

[0020] S5: If the accuracy does not meet the requirements, manual correction will be performed and then enter S4 again; if it meets the requirements, the subsequent construction process will be entered.

[0021] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0022] 1. The construction device of the present invention realizes comprehensive quality monitoring of the frame assembly manufacturing process through integrated detection tools and detection methods; especially in terms of the flatness and deformation of the frame assembly, the overall stability and reliability of the frame assembly are ensured; the flatness of the frame side beams, the groove angle of the longitudinal beams, etc. are strictly controlled, which not only improves the skeleton accuracy of the frame, but also significantly reduces the assembly problems caused by frame deformation, providing a solid foundation for subsequent assembly processes, making the vehicle more stable and safe during driving; at the same time, it reduces the tire wear caused by frame deformation, extends the service life of the tire, and reduces the maintenance cost of the vehicle.

[0023] 2. The construction device of the present invention has a simple structure and is easy to operate, and can quickly complete various inspection tasks of the frame assembly; it not only improves the inspection efficiency, but also reduces the production cost caused by repeated inspection and rework. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a detection platform provided in a preferred embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the working status of the detection platform provided in a preferred embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the structure of an angle detection ruler provided in a preferred embodiment of the present invention;

[0027] Figure 4 A schematic diagram of an adjustment card block provided in a preferred embodiment of the present invention;

[0028] Figure 5 A schematic diagram of a movable plate provided for a preferred embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the working condition of the groove detection ruler provided in the preferred embodiment of the present invention;

[0030] Figure 7A schematic diagram of the structure of a go / no-go gauge provided in a preferred embodiment of the present invention;

[0031] Figure 8 A schematic diagram of the working condition of a go / no-go gauge provided in a preferred embodiment of the present invention;

[0032] Fig. 9 A schematic diagram of the structure of an I-shaped flat ruler provided in a preferred embodiment of the present invention;

[0033] Fig.10 A schematic diagram of the working condition of an I-shaped flat ruler provided in a preferred embodiment of the present invention;

[0034] Fig.11 A schematic diagram of the flatness detection ruler structure provided by a preferred embodiment of the present invention;

[0035] Fig.12 A schematic diagram of the working condition of a flatness detection ruler provided by a preferred embodiment of the present invention;

[0036] Fig.13 A schematic diagram of the structure of a special-shaped flatness detection ruler provided by a preferred embodiment of the present invention;

[0037] Fig.14 A schematic diagram of the working condition of a special-shaped flatness detection ruler provided by a preferred embodiment of the present invention;

[0038] Fig.15 The present invention is a schematic flow chart of a method for detecting a side beam type vehicle frame according to an embodiment of the present invention.

[0039] In all the drawings, the same reference numerals represent the same technical features, specifically: 100-detection platform, 110-detection plane, 120-pin slot, 130-right-angle plate, 200-angle detection ruler, 210-reference plate, 220-bolt, 230-adjustment block, 240-movable plate, 300-go / no-go gauge, 400-flatness detection assembly, 410-flatness ruler, 420-flatness detection ruler, 421-detection arm, 422-hand grip slot, 423-hand guard, 430-special-shaped flatness detection ruler, 431-handle, 432-support base plate, 433-special-shaped plate, A-frame assembly, B-longitudinal beam, C-side beam. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Based on the above problems, the present invention is composed of 6 kinds of tools, namely: detection platform 100, angle detection ruler 200, go / no-go gauge 300, "I" flat ruler 410, flatness detection ruler 420 and special-shaped plane detection ruler 430. The present invention uses 6 kinds of tools to respectively monitor and detect the accuracy of longitudinal beams of different cross sections, play an auxiliary assembly role in different assembly processes and different assembly parts (steering gear, drive axle, tire side reducer, etc.), and monitor the consistency of the frame assembly through the process to effectively improve the accuracy of the frame, which is used to solve the problems of tire eccentric wear, brake deviation, etc., and effectively improve the driving performance and passing performance of the vehicle.

[0042] Specifically,

[0043] The present invention relates to a steel-concrete assembled slope roof construction device, comprising a detection platform 100 at the bottom, an angle detection ruler 200, a thickness detection component and a flatness detection assembly 400 at the top of the detection platform 100;

[0044] The angle of the groove of the vehicle longitudinal beam B is detected by the angle detection ruler 200; the frame assembly A is placed on the detection platform 100, the vertical installation condition of the frame assembly A is detected by the detection platform 100, and the thickness and flatness of the vehicle side beam C are respectively detected by the thickness detection component and the flatness detection component 400.

[0045] Please refer to Figure 1 and Figure 2 The detection platform 100 includes a detection plane 110, a right-angle plate 130 vertically placed on the upper part of the detection plane 110, and a latch groove 120 fixedly connected to the right-angle plate 130; a plurality of latch holes matching the latch groove 120 are arranged on the detection plane 110, and the right-angle plate 130 is fixed on the detection plane 110 by passing the latch through the latch groove 120 and the latch hole in sequence.

[0046] There are several right-angle plates 130 and bayonet slots 120 with several sizes. The frame assembly A is placed horizontally on the detection plane 110, and the right-angle plates 130 and bayonet slots 120 of corresponding sizes are selected according to the structure of the frame assembly A. The frame assembly A is moved to fit with the right-angle plate 130 fixed on the detection plane 110, and the vertical installation condition of the frame assembly A is judged by observing the fit between the frame assembly A and the right-angle plate 130.

[0047] The bottom surface of the right angle plate 130 is designed to fit closely with the detection plane 110 to ensure detection accuracy. The latch slot 120 is designed to be adjustable so as to fix the right angle plate at different positions to meet various detection requirements.

[0048] Please refer to Figure 3 ,4 , 5 and 6, the angle detection ruler 200 is Y-shaped and includes a reference plate 210, an adjustment block 230 matching the size of the upper slot of the reference plate 210, a bolt 220 and a movable plate 240; the adjustment block 230 and the reference plate 210 respectively have threaded holes matching the movable plate 240, and the movable plate 240 is connected to the adjustment block 230, and the movable plate 240 is connected to the reference plate 210 through the bolt 220.

[0049] The adjustment block 230 has various models, and the angle measured by the angle detection ruler 200 can be adjusted by placing the adjustment block 230 of different sizes into the slot of the reference plate 210 .

[0050] Please refer to Figure 7 and Figure 8 The thickness detection component is a go / no-go gauge 300 and is a shoe-shaped one. The size of the go / no-go gauge 300 is gradually reduced from the opening to the set size.

[0051] Please refer to Fig. 9 and Fig.10 The flatness detection assembly 400 includes a flatness ruler 410, a flatness detection ruler 420 and a special-shaped flatness detection ruler 430; the flatness ruler 410 includes a front flange surface, a rear flange surface and a web surface which is perpendicular to and fixedly connected to the front flange surface and the rear flange surface. The front flange surface is fitted with the edge beam C, and the bottom of the front flange surface is fitted with the detection plane 110, and the plane flatness is judged by observing the contact between the rear flange surface and the detection plane 110.

[0052] Please refer to Fig.11 and Fig.12 The flatness detection ruler 420 is U-shaped and includes a detection arm 421, a grip groove 422 and a hand pad 423 arranged on the same side of the detection arm 421; the detection arm 421 has two and is arranged in parallel from the opening of the flatness detection ruler 420 to the end of the closed side of the flatness detection ruler 420, and the size of the end is smaller than the opening.

[0053] Please refer to Fig.13 and Fig.14 The special-shaped flatness detection ruler 430 includes a handle 431 on the top, a supporting base plate 432 connected to the handle 431, and several special-shaped plates 433 vertically connected to two parallel surfaces of the edge of the supporting base plate 432; the special-shaped flatness detection ruler 430 has various sizes according to different spacings between the special-shaped plates 433, and the flatness of the side beam C is detected by aligning several of the special-shaped plates 433 with different planes of the side beam C at the same time.

[0054] In some preferred embodiments, the spacing between the special-shaped plates 433 of the anisotropic flatness detection ruler 430 can be adjusted as needed to meet the detection requirements of different flatnesses.

[0055] like Fig.15 As shown, as another aspect of the present invention, it also relates to a construction method of a steel-concrete assembled slope roof construction device, comprising the following steps:

[0056] S1, component preparation, cutting, stamping, bending and inspecting steel plates according to the frame structural parts required by the frame assembly A, beveling with a beveling machine, and using the angle detection ruler 200 to check the beveling angle at the joint of the longitudinal beam B;

[0057] Specifically,

[0058] The step one is specifically as follows: firstly, the steel plate is laser cut according to the frame structure required for making the frame assembly, and then put into the stamping machine for stamping, and then the parts are checked for defects, cracks, rust and deformation. When the beveling machine is used to make the beveling, the beveling angle is required to be 45°-60°, and the angle detection ruler 200 is used for detection; the angle of the angle detection ruler 200 is set by replacing the adjustment block 230. In some preferred embodiments, the angle detection ruler 200 is provided with two angles of 45° and 60°. When butt welding, the gap width of 1-1.5mm is required to ensure one-time welding. Qualified parts are reserved, and the various parts required for assembling the frame assembly are obtained.

[0059] S2, equip the inspection platform 100, place the components prepared in S1 on the inspection platform 100 for segmented welding; during the welding process, move the welded parts according to welding needs, and observe the verticality of the welding by fitting the right-angle plate 130 and the bayonet slot 120 to the area being welded, and modify the welding angle;

[0060] Specifically,

[0061] In some preferred embodiments, argon-rich arc welding is used to weld the side beam C subassembly and the reinforcement plate in sections, wherein the main body of the side beam C is welded by single-sided welding and double-sided forming, and the reinforcement plate is welded in sections. Then the liner and nut are connected by spot welding; the liner and nut are spot welded at three points, the weld height is ≥5mm, and the welding points are full and without collapse.

[0062] S3, thickness and flatness inspection, after completing S2, the frame assembly A is assembled using a tooling positioning device to buckle the inner and outer pieces of the side beam B, and then weld and fix them, and then use the go / no-go gauge 300 and the flatness ruler 410 to spot check the thickness and flatness of the side beam B respectively;

[0063] Specifically,

[0064] The inner and outer plates of the side beam C are fitted in an interference fit. After the inner and outer plates are buckled, the side beam assembly is spot welded in sections. In some preferred embodiments, the welding point is required to be 3-5mm, and the welding point spacing is 70mm; the buckling thickness dimensions are: 56±1mm at a, 55.5±1mm at b, 84±1mm at c, and 70±1mm at d. The go / no-go gauge 300 and the flatness ruler 410 are used to spot check the thickness and flatness of the side beam C.

[0065] S4, special inspection for flatness, after the side beam B cools down to room temperature, the process is transferred, during which the flatness inspection ruler 420 is used to inspect the distortion state of the side beam B; after the side beam B is fully welded and formed, it is hoisted to the special inspection platform, and the flatness inspection ruler 420 is used to inspect the flatness of the side beam B; the special-shaped flatness inspection ruler 430 is used to inspect the distortion state of the side beam B;

[0066] S5: If the accuracy does not meet the requirements, manual correction will be performed and then enter S4 again; if it meets the requirements, the subsequent construction process will be entered.

[0067] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A side beam frame detection device, characterized in that: It comprises a detection platform (100) at the bottom, an angle detection ruler (200), a thickness detection component and a flatness detection assembly (400) at the top of the detection platform (100); The angle of the groove of the vehicle longitudinal beam (B) is detected by the angle detection ruler (200); the frame assembly (A) is placed on the detection platform (100), the vertical installation condition of the frame assembly (A) is detected by the detection platform (100), and the thickness and flatness of the vehicle side beam (C) are respectively detected by the thickness detection component and the flatness detection assembly (400).

2. The side beam type frame detection device according to claim 1, characterized in that: The detection platform (100) comprises a detection plane (110), a right-angle plate (130) vertically placed on the upper part of the detection plane (110), and a latch slot (120) fixedly connected to the right-angle plate (130); a plurality of latch holes matching the latch slot (120) are arranged on the detection plane (110), and the right-angle plate (130) is fixed on the detection plane (110) by sequentially inserting latches through the latch slots (120) and the latch holes.

3. The side beam type frame detection device according to claim 2, characterized in that: There are several right-angle plates (130) and bayonet slots (120) with several sizes. The frame assembly (A) is horizontally placed on the detection plane (110), and right-angle plates (130) and bayonet slots (120) of corresponding sizes are selected according to the structure of the frame assembly (A); the frame assembly (A) is moved to fit with the right-angle plate (130) fixed on the detection plane (110), and the vertical installation status of the frame assembly (A) is judged by observing the fit between the frame assembly (A) and the right-angle plate (130).

4. The side beam type frame detection device according to claim 1, characterized in that: The angle detection ruler (200) is Y-shaped and comprises a reference plate (210), an adjustment block (230) whose size matches the upper slot of the reference plate (210), a bolt (220) and a movable plate (240); threaded holes matching the movable plate (240) are respectively provided on the adjustment block (230) and the reference plate (210); the movable plate (240) and the adjustment block (230), and the movable plate (240) and the reference plate (210) are connected via the bolt (220).

5. The side beam type frame detection device according to claim 4, characterized in that: The adjustment card block (230) has multiple models, and the angle measured by the angle detection ruler (200) is adjusted by placing the adjustment card blocks (230) of different sizes into the card slot of the reference plate (210).

6. The side beam type frame detection device according to claim 1, characterized in that: The thickness detection component is a go / no-go gauge (300) in a shoe-shaped form, and the size of the go / no-go gauge (300) is gradually reduced from the opening inward to a set size.

7. The side beam type frame detection device according to claim 2, characterized in that: The flatness detection assembly (400) comprises a flatness ruler (410), a flatness detection ruler (420) and a special-shaped flatness detection ruler (430); the flatness ruler (410) comprises a front flange surface, a rear flange surface and a web surface which is perpendicular to and fixedly connected to the front flange surface and the rear flange surface at the same time; the flatness of the plane is determined by fitting the front flange surface to the edge beam (C) and fitting the bottom of the front flange surface to the detection plane (110) and observing the contact between the rear flange surface and the detection plane (110).

8. The side beam type frame detection device according to claim 7, characterized in that: The flatness detection ruler (420) is U-shaped and comprises a detection arm (421), a hand grip groove (422) and a hand pad (423) arranged on the same side of the detection arm (421); the detection arm (421) has two and is arranged in parallel from the opening of the flatness detection ruler (420) to the end of the closed side of the flatness detection ruler (420), and the size of the end is smaller than the opening.

9. The side beam type frame detection device according to claim 8, characterized in that: The special-shaped flatness detection ruler (430) comprises a handle (431) on the top, a supporting base plate (432) connected to the handle (431), and a plurality of special-shaped plates (433) vertically connected to two parallel surfaces of the edge of the supporting base plate (432); the special-shaped flatness detection ruler (430) has a plurality of sizes according to different spacings between the special-shaped plates (433), and the flatness of the side beam (C) is detected by aligning the plurality of special-shaped plates (433) with different planes of the side beam (C) at the same time.

10. A method for detecting a side beam type vehicle frame, characterized in that: The detection device for the side beam type frame according to any one of claims 1 to 9 is used to implement the method, comprising the following steps: S1, component preparation, cutting, stamping, bending and inspecting steel plates according to the frame structural parts required by the frame assembly (A), beveling with a beveling machine, and using the angle detection ruler (200) to inspect the beveling angle at the joint of the longitudinal beam (B); S2, equipping the inspection platform (100), placing the components prepared in S1 on the inspection platform (100) for segmented welding; during the welding process, moving the welded parts according to welding requirements, and observing the verticality of the welding by fitting the right-angle plate (130) and the latch groove (120) to the area being welded, and modifying the welding angle; S3, thickness and flatness inspection, on the frame assembly (A) of S2, inner and outer pieces of the side beam (B) are buckled together using a tooling positioning, and then welded and fixed, and then the thickness and flatness of the side beam (B) are randomly inspected using the go / no-go gauge (300) and the flatness ruler (410); S4, special inspection for flatness, after the side beam (B) is cooled to room temperature, the process is changed, during which the flatness detection ruler (420) is used to detect the distortion state of the side beam (B); after the side beam (B) is fully welded and formed, it is hoisted to a special inspection platform, and the flatness of the side beam (B) is detected using a flatness detection ruler (420); the distortion state of the side beam (B) is detected using the special-shaped flatness detection ruler (430); S5: If the accuracy does not meet the requirements, manual correction will be performed and then enter S4 again; if it meets the requirements, the subsequent construction process will be entered.

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