Commercial vehicle high roof cover testing fixture and matching method

Abstract

The present application belongs to the technical field of body-in-white detection, and discloses a commercial vehicle high roof cover testing fixture and matching method, which comprises a base plate, an outer plate assembly positioning support assembly and an inner beam assembly positioning support assembly. The outer plate assembly positioning support assembly and the inner beam assembly positioning support assembly are respectively fixed on the base plate, and are used for respectively inverting and positioning the outer plate assembly or the inner beam assembly on the outer plate assembly positioning support assembly or the inner beam assembly positioning support assembly, so that the outer plate and the inner beam are both exposed and measurable. A sliding mechanism of the outer plate assembly positioning support assembly is used for measuring the gap and interference of the overlap area of two parts. The testing fixture inverts and positions the roof assembly, can realize the measurement and overlap confirmation of the roof assembly, the outer plate assembly, the inner beam assembly and the stamping part, can also realize the overlap confirmation of the outer plate assembly and the inner beam assembly, the sliding rail design makes the overlap area measurable in terms of gap and interference, the pull-riveting screw assembly verification process is independent of the dependence on the welding production line, and the verification efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of body-in-white inspection technology, specifically relating to a high roof inspection tool and matching method for commercial vehicles. Background Technology

[0002] The high-roof assembly of commercial vehicles is one of the core components of the commercial vehicle cab. Its complex structure is mainly composed of two parts: the outer panel assembly and the inner beam assembly. The outer panel assembly, as the external load-bearing part of the high-roof, includes key stamped parts such as the front roof, middle roof, rear roof, left roof, and right roof. The inner beam assembly, as the structural support part of the high-roof, includes major load-bearing parts such as the left and right longitudinal beams of the front roof, the sunroof beam, the left and right longitudinal beams of the middle roof, the left and right longitudinal beams of the rear roof, and the right longitudinal beams of the rear roof. The coordinated assembly of the outer panel assembly and the inner beam assembly together ensures the structural strength and appearance integrity of the high-roof.

[0003] As a critical exterior component of commercial vehicles, the high-roof assembly's surface flatness and contour accuracy directly impact the overall appearance and quality of the vehicle. Furthermore, the high-roof assembly requires mounting holes for various accessories such as interior trim panels, overhead racks, and rear spoilers. The positional accuracy of these mounting holes directly determines the assembly quality and efficiency of subsequent components. Therefore, the industry places extremely high demands on the overall dimensional accuracy of the high-roof assembly. However, due to the large number of parts and complex inter-part relationships within the high-roof assembly, coupled with the fact that many parts are manufactured using stamping processes, dimensional deviations are easily introduced during stamping due to material properties, mold precision, and process parameters. This significantly increases the difficulty of controlling the dimensional accuracy of the high-roof assembly, making it one of the key challenges in quality control during commercial vehicle production.

[0004] In the manufacturing process of commercial vehicle high-roof assemblies, inspection fixtures, as core dimensional measurement tooling, are key equipment for ensuring the dimensional accuracy of parts and verifying the rationality of assembly. Their performance directly affects the production quality and efficiency of the high-roof assembly. Currently, existing commercial vehicle high-roof inspection fixtures in the industry have relatively limited functions and are insufficient to meet the full-process dimensional inspection and assembly verification needs of complex high-roof structures.

[0005] For example, the commercial vehicle high-roof inspection fixture disclosed in patent CN108981547B, "Vehicle Roof Assembly Inspection Fixture Components," can only measure the dimensions of the roof and outer panel assembly. It cannot simultaneously measure the dimensions of the inner beam assembly and individual stamped parts. This necessitates the preparation of dedicated measuring fixtures for the inner beam assembly and stamped parts during production, increasing tooling manufacturing costs and occupying significant production space, thus reducing the utilization rate of the production space. Furthermore, this existing fixture can only confirm the overlap status between related stamped parts of the outer panel assembly, failing to effectively inspect the more critical overlap accuracy and fit between the outer panel assembly and the inner beam assembly. The overlap quality of the outer panel and inner beam directly determines the structural stability of the high-roof assembly. This deficiency in the existing fixture easily leads to products with unqualified overlaps flowing into subsequent processes, increasing rework costs and quality risks.

[0006] Furthermore, the existing inspection functions of top cover fixtures are limited to determining whether the dimensions of parts meet preset tolerance requirements, i.e., they can only achieve a qualitative judgment of "pass / fail" and cannot provide effective guidance for correcting detected dimensional deviations. Since the dimensional deviations of high-top cover stamped parts are affected by multiple factors such as mold precision and stamping process, if the root cause of the deviation cannot be identified and a precise correction direction cannot be given, production personnel may have to blindly increase the dimensional precision requirements of stamped parts to avoid quality risks. This leads to increased costs and longer modification cycles for stamping molds, as well as the problem of over-quality due to excessively strict tolerances, which significantly increases the production cost of the high-top cover assembly.

[0007] Meanwhile, in practical applications, existing inspection tools still rely on welding production lines for assembly verification, which not only occupies valuable welding production resources, but is also susceptible to interference from the precision of welding fixtures, resulting in insufficient accuracy and low verification efficiency, making it difficult to meet the needs of large-scale and efficient commercial vehicle production.

[0008] In summary, given the shortcomings of existing commercial vehicle high roof inspection fixtures, such as limited functionality, limited inspection range, inability to provide effective dimensional correction guidance, low verification efficiency, and high cost, developing a comprehensive commercial vehicle high roof matching fixture and matching method that can reduce production costs and improve verification efficiency has become an urgent technical problem to be solved in the commercial vehicle parts manufacturing industry. Summary of the Invention

[0009] The purpose of this invention is to provide a high roof inspection fixture and matching method for commercial vehicles. By designing an inverted positioning of the roof assembly, it is possible to measure and confirm the overlap of the roof assembly, outer panel assembly, inner beam assembly, and stamped parts, as well as to confirm the overlap of the outer panel assembly and inner beam assembly. The design of the slide rail and slide table enables switching between a theoretical 0mm gap state and a 5mm gap state in the overlap area of ​​the two parts, which can measure both the gap and the interference. The screw assembly is formed by riveting and then verified. The verification process can be completely independent of the welding production line, reducing production line occupation, greatly improving verification efficiency, accurately determining the correction position, reducing the workload of mold modification, and lowering the difficulty of mold modification.

[0010] The specific details of the plan are as follows:

[0011] A high-roof inspection fixture for commercial vehicles includes a base plate, an outer panel assembly positioning bracket assembly, and an inner beam assembly positioning bracket assembly. The outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly are respectively fixed at corresponding positions on the base plate. Both the outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly include positioning components and clamping components. The outer panel assembly positioning bracket assembly is used to invert and position the outer panel assembly on the outer panel assembly positioning bracket assembly, and the inner beam assembly positioning bracket assembly is used to invert and position the inner beam assembly on the inner beam assembly positioning bracket assembly, so that both the outer panel and the inner beam are exposed and measurable. The outer panel assembly positioning bracket assembly includes a sliding mechanism for the overall movement of the rear roof and for measuring the gap and interference of the overlapping area of ​​the two parts.

[0012] In this invention, the X direction refers to the extension direction from the front roof to the rear roof, the Y direction refers to the extension direction from the left roof to the right roof, and the Z direction is the vertical direction. All positioning components in this invention include positioning pins and positioning surfaces. Clamping components include tightening nuts and C-clamps. The base plate of the commercial vehicle high roof inspection fixture of this invention is set on the ground. The outer panel assembly positioning bracket assembly includes a front roof positioning bracket, a middle roof positioning bracket, a left roof positioning bracket, a right roof positioning bracket, and a rear roof positioning bracket, which are respectively fixedly installed on the base plate. The outer panel assembly positioning bracket assembly is used to invert and position each part of the outer panel assembly on the outer panel assembly positioning bracket assembly. The inner beam assembly positioning bracket assembly includes a middle roof left longitudinal beam positioning bracket, a middle roof right longitudinal beam positioning bracket, a sunroof beam positioning bracket, a front roof left longitudinal beam positioning bracket, and a front roof right longitudinal beam positioning bracket, which are respectively fixedly installed on the base plate. This is used to invert and position each part of the inner beam assembly on the inner beam assembly positioning bracket assembly, so that both the outer panel and the inner beam are exposed and measurable. This invention, by inverting the top cover assembly, enables the measurement and overlap confirmation of the top cover assembly, outer panel assembly, inner beam assembly, and stamped parts, as well as the overlap confirmation of the outer panel assembly and inner beam assembly. The rear top cover positioning bracket is equipped with a slide rail and slide table, allowing the rear top cover to be moved backward as a whole, enabling switching between a theoretical 0mm gap state and a 5mm gap state at the overlap area of ​​the two parts. This allows for the measurement of both the gap and interference. The matching method of this invention forms a screw assembly through riveting, and then verifies the next-level assembly. The entire verification process can be completely independent of the welding production line, reducing production line occupation and greatly improving verification efficiency. The evaluation focuses on the overlapping state of two parts. When the deviation trends of the two parts are opposite, the overlapping of the two parts will tend towards an ideal state. At this point, even if the individual dimensions of both parts are out of tolerance, the status quo can be maintained without correction, avoiding excessively increasing the dimensional accuracy requirements of stamped parts. By eliminating interference first, then gaps, and eliminating large deviations first, then small deviations, the correction position can be accurately determined, reducing the workload of mold modification. By performing non-theoretical corrections on parts that are easy to modify, the deviations of parts that are difficult to modify can be compensated, reducing the difficulty of mold modification. The positioning components in this invention include positioning pins and positioning surfaces, and the clamping components include tightening nuts and C-clamps. Of course, other positioning and clamping components can also be used, which are conventional technologies and need not be elaborated upon. The positioning pins and positioning surfaces on the outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly are matched according to the position, shape, and size of the component to be positioned, so as to enable the outer panel assembly and the inner beam assembly to be positioned inverted. Some of the positioning brackets in the inspection fixtures of the present invention include multiple inspection fixtures, and the shapes, structures, and sizes of the inspection fixtures are also different. They can be fixed and used with each other by brackets, folding plates, etc., so as to match the shape and size of the component to be positioned, which will not be described separately.When using the fixture of the present invention to verify the fit between the outer plate assembly and the inner beam assembly, in order to reduce the accuracy loss caused by the reference transformation, the fixture structure will be simplified and over-positioning will be avoided. At the same time, in order to avoid interference between the inner beam assembly and the middle top cover when the inner beam assembly and the outer plate assembly are matched, the first pin body that was originally exposed upwards in the pin sleeve will be removed and the second pin body will be installed in the pin sleeve, so that the second pin body is exposed below the pin sleeve.

[0013] Furthermore, the outer panel assembly positioning bracket assembly includes a front top cover positioning bracket, a middle top cover positioning bracket, a left top cover positioning bracket, a right top cover positioning bracket, and a rear top cover positioning bracket. The front top cover positioning bracket, the middle top cover positioning bracket, the left top cover positioning bracket, the right top cover positioning bracket, and the rear top cover positioning bracket are respectively fixed on the base plate for inverted positioning of the front top cover, the middle top cover, the left top cover, the right top cover, and the rear top cover. The inner beam assembly positioning bracket assembly includes a middle top cover left longitudinal beam positioning bracket, a middle top cover right longitudinal beam positioning bracket, a sunroof beam positioning bracket, a front top cover left longitudinal beam positioning bracket, and a front top cover right longitudinal beam positioning bracket. The middle top cover left longitudinal beam positioning bracket, the middle top cover right longitudinal beam positioning bracket, the sunroof beam positioning bracket, the front top cover left longitudinal beam positioning bracket, and the front top cover right longitudinal beam positioning bracket are respectively fixed on the reference plate for inverted positioning of the middle top cover left longitudinal beam, the middle top cover right longitudinal beam, the sunroof beam, the front top cover left longitudinal beam, and the front top cover right longitudinal beam.

[0014] Furthermore, the top cover positioning bracket includes multiple top cover positioning fixtures. Each top cover positioning fixture includes a bracket base and a positioning component. The bracket is fixed on the base plate, and the positioning components are respectively disposed on the bracket base for positioning the top cover. At least some of the fixtures also include clamping components and multiple adjusting shims. The clamping components are used to clamp the top cover parts, and the adjusting shims are used to adapt to the positioning of parts of different heights of the top cover.

[0015] Furthermore, the rear top cover positioning bracket includes a slide table, multiple slide rails, locking pins, multiple supports, and positioning components. The multiple slide rails are fixed parallel to each other on the base plate at intervals along the front-rear direction, corresponding to the position of the rear top cover. The slide table is vertically slidably connected to the slide rails. The slide table is provided with a first locking hole and a second locking hole. The base plate below the first locking hole is provided with a first fixing hole. The locking pin can be inserted into both the first locking hole and the first fixing hole simultaneously to position and lock the slide table. The base plate below the second locking hole is provided with a second fixing hole. The second fixing hole is offset backward by 5mm from the second locking hole. When the slide table moves backward by 5mm, the locking pin can be inserted into both the second locking hole and the second fixing hole simultaneously to position and lock the slide table, realizing the positioning function of the rear top cover after moving backward by 5mm with the slide table. The supports are respectively set on the slide table, and the positioning components and clamping components are respectively set on the corresponding supports for positioning the rear top cover.

[0016] The cooperation of the slide rail and the slide table allows the entire rear top cover to move backward (in the X direction). The locking pin, inserted into the first locking hole and the first fixing hole, locks the slide table in its theoretical locking position. After removing the locking pin, the slide table moves backward 5mm, and then the locking pin is inserted into the second locking hole and the second fixing hole to lock the slide table in its theoretical locking position (5mm backward in the X direction). The number of locking pins, the first locking hole, the first fixing hole, the second locking hole, and the second fixing hole can be set as needed; preferably, two are used, respectively located on both sides of the slide table for positioning and locking.

[0017] Furthermore, the left top cover positioning bracket and the right top cover positioning bracket have symmetrical structures. Both include a bracket base, a positioning component, and a clamping component. The positioning component and the clamping component are respectively set in corresponding positions on the bracket base. The bracket base of the left top cover positioning bracket and the bracket base of the right top cover positioning bracket are respectively fixed to the left and right sides of the substrate. The left top cover positioning bracket is used to position the left top cover, and the right top cover positioning bracket is used to position the right top cover.

[0018] Furthermore, the front roof positioning bracket includes two front roof positioning clamps. The two front roof positioning clamps are symmetrical in structure. Each front roof positioning clamp includes a bracket base, a positioning component, and a clamping component. The positioning component and the clamping component are respectively disposed at corresponding positions on the bracket base. The two front roof positioning clamps are respectively disposed on the base plate at positions corresponding to the front roof, and are used for inverted positioning of the front roof. The front roof left longitudinal beam positioning bracket and the front roof right longitudinal beam positioning bracket are symmetrical in structure. Both include a positioning component and a clamping component. The positioning component and the clamping component are respectively disposed at corresponding positions on the bracket bases of the two front roof positioning clamps. The front roof left longitudinal beam positioning bracket is used for inverted positioning of the front roof left longitudinal beam, and the front roof right longitudinal beam positioning bracket is used for inverted positioning of the front roof right longitudinal beam.

[0019] Furthermore, the positioning brackets for the left and right longitudinal beams of the central top cover have the same structure and are symmetrically arranged. Both include a bracket base, a positioning component, and a clamping component. The positioning component and the clamping component are respectively set at corresponding positions on the bracket base. The positioning bracket for the left longitudinal beam of the central top cover is used for the inverted positioning of the left longitudinal beam of the central top cover, and the positioning bracket for the right longitudinal beam of the central top cover is used for the inverted positioning of the right longitudinal beam of the central top cover.

[0020] Furthermore, the sunroof beam positioning bracket includes a sunroof bracket base and multiple sunroof beam fixtures. Each sunroof beam fixture includes a positioning component / positioning assembly and a clamping assembly. The sunroof bracket base is a cuboid structure fixed to the base plate at the position corresponding to the sunroof. The sunroof beam fixtures are respectively fixed to the sunroof bracket base or to the base plate surrounding the sunroof bracket base. The positioning assembly includes a movable positioning pin, which includes a pin sleeve, a first pin body, and a second pin body. The first pin body is detachably and fixedly connected to the upper part of the pin sleeve and can be exposed on the upper end face of the pin sleeve. The second pin body is detachably and fixedly connected to the lower part of the pin sleeve and can be exposed on the lower end face of the pin sleeve.

[0021] The movable positioning pin on the sunroof positioning bracket includes a pin sleeve and a pin body, with the pin body detachably and fixedly connected inside the pin sleeve. This design is intended to prevent interference between the inner beam assembly and the center top cover when the outer panel assembly and inner beam assembly are being tested together. The first pin body, which was originally exposed above the pin sleeve, is removed, and the second pin body is installed inside the pin sleeve, so that the second pin body is exposed below the pin sleeve.

[0022] Furthermore, it also includes an auxiliary measuring ladder. The front end of the base plate is also provided with a ladder support. One end of the auxiliary measuring ladder is set on the ground outside the base plate, the middle part of the auxiliary measuring ladder is fixed on the ladder support, and the other end is fixedly connected to the upper surface of the skylight support base, so as to facilitate the worker's measurement operation.

[0023] A matching method for a commercial vehicle high-roof inspection fixture, applied to the aforementioned commercial vehicle high-roof inspection fixture, comprising the following steps:

[0024] S1. Seal the stamped parts of the left longitudinal beam of the front roof, the right longitudinal beam of the front roof, the sunroof beam, the left longitudinal beam of the middle roof, and the right longitudinal beam of the middle roof respectively;

[0025] S2. Use a coordinate measuring machine to measure the dimensions of the overlapping area of ​​the stamped part;

[0026] S3. Use a feeler gauge to measure the gap in the overlapping area to identify areas of interference and excessive gaps (greater than 0.5 mm).

[0027] S4. Based on the coordinate measuring machine report of the stamped part, determine the problem area of ​​the stamped part;

[0028] S5. Manually repair the problem area to eliminate interference and excessive gaps;

[0029] S6. Drilling and riveting in the overlapping area to form the inner beam screw assembly;

[0030] S7. Use a coordinate measuring machine to measure the inner beam screw assembly, and remove the inner beam screw assembly after measurement;

[0031] S8. Seal the front top cover, middle top cover, rear top cover, left top cover, and right top cover stampings respectively;

[0032] S9. Use a coordinate measuring machine to measure the dimensions of the overlapping area of ​​the stamped part;

[0033] S10. Use a feeler gauge to measure the gap in the overlapping area to identify areas of interference and excessive gaps (greater than 0.5 mm).

[0034] S11. Based on the coordinate measuring machine report of the stamped part, determine the problem area of ​​the stamped part;

[0035] S12. Manually repair the problem area to eliminate interference and excessive gaps;

[0036] S13. Drilling and riveting in the overlapping area to form the outer plate screw assembly;

[0037] S14, Positioning inner beam screw assembly;

[0038] S15. Use a feeler gauge to measure the gap between the outer panel assembly and the inner beam assembly in the overlapping area, identify areas of interference and excessive gap, where the gap is greater than 0.5mm;

[0039] S16. Based on the coordinate measuring machine (CMM) reports of the assembly and stamped parts, determine the problem area of ​​the stamped parts;

[0040] S17. Manually repair the problematic area to eliminate interference and excessive gaps;

[0041] S18. Based on the amount of manual repair, issue formal mold modification instructions for the relevant stamping parts.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] Existing top cover inspection fixtures, as dimensional measurement tooling, have relatively limited functions, only able to determine whether parts meet tolerance requirements, and cannot effectively guide the dimensional correction of stamped parts. The inspection fixture of this invention has comprehensive functions, compatible with the measurement and overlap status confirmation of outer plates and inner beams, reducing tooling manufacturing costs and space occupation. Based on the matching method of this inspection fixture, the occupation of welding production lines can be reduced, the influence of welding fixture accuracy can be eliminated, the effect is intuitive, and the verification efficiency is improved. Through the systematic matching method, the dimensional accuracy requirements of stamped parts can be avoided by excessively increasing them. Through precise position correction and non-theoretical correction of stamped parts, the cost and cycle of stamping die modification are greatly reduced, and the excess quality caused by excessively strict tolerances is reduced. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of the inspection fixture with auxiliary measuring ladder of the present invention.

[0045] Figure 2 This is a schematic diagram of the outer plate assembly and inner beam assembly of the fixture positioning device with auxiliary measuring ladder according to the present invention.

[0046] Figure 3 This is a schematic diagram of the overall structure of the inspection fixture without auxiliary measuring ladder according to the present invention.

[0047] Figure 4 This is a schematic diagram of multiple top cover positioning fixtures of the present invention.

[0048] Figure 5 This is a schematic diagram of the structure of the rear top cover positioning bracket of the present invention.

[0049] Figure 6 This is a schematic diagram of the left top cover positioning bracket of the present invention.

[0050] Figure 7 This is a schematic diagram of the right top cover positioning bracket of the present invention.

[0051] Figure 8 This is a schematic diagram of the front top cover positioning bracket of the present invention.

[0052] Figure 9 This is a schematic diagram of the positioning bracket for the left longitudinal beam of the front top cover of the present invention.

[0053] Figure 10 This is a schematic diagram of the positioning bracket for the right longitudinal beam of the front top cover of the present invention.

[0054] Figure 11 This is a schematic diagram of the positioning bracket for the left longitudinal beam of the top cover of the present invention.

[0055] Figure 12 This is a structural schematic diagram of the multiple skylight beam inspection fixtures of the present invention.

[0056] Figure 13 A schematic diagram showing the inverted installation of the movable positioning pin of the sunroof beam positioning bracket when positioning the outer panel assembly and the inner beam assembly.

[0057] In the picture:

[0058] 1. Base plate; 1.1. Escalator bracket; 2. Front top cover positioning bracket; 2.1. Front top cover positioning fixture; 3. Middle top cover positioning bracket; 3.1. Middle top cover positioning fixture; 4. Left top cover positioning bracket; 5. Right top cover positioning bracket; 6. Rear top cover positioning bracket; 6.1. Slide table; 6.11. First locking hole; 6.12. Second locking hole; 6.2. Slide rail; 6.3. Locking pin; 6.4. Support; 7. Middle top cover left longitudinal beam positioning bracket; 8. Middle top cover right longitudinal beam positioning bracket; 9. Skylight beam positioning bracket; 9.1. Skylight bracket seat; 9.2 Skylight beam inspection fixture; 10. Front top cover left longitudinal beam positioning bracket; 11. Front top cover right longitudinal beam positioning bracket; 12. Auxiliary measuring escalator; 13. Positioning assembly; 14. Clamping assembly; 15. Outer panel assembly; 16. Inner beam assembly. Detailed Implementation

[0059] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0062] The following combination Figures 1-13 The present invention will be described in conjunction with the embodiments:

[0063] Example 1:

[0064] A commercial vehicle high-roof inspection tool, see Figure 3 As shown, the system includes a base plate 1, an outer panel assembly positioning bracket assembly, and an inner beam assembly positioning bracket assembly. The outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly are respectively fixed at corresponding positions on the base plate 1. Both the outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly include a positioning component 13 and a clamping component 14. The outer panel assembly positioning bracket assembly is used to invert and position the outer panel assembly on the outer panel assembly positioning bracket assembly. The inner beam assembly positioning bracket assembly is used to invert and position the inner beam assembly on the inner beam assembly positioning bracket assembly, so that both the outer panel and the inner beam are exposed and measurable. The outer panel assembly positioning bracket assembly includes a sliding mechanism for the overall movement of the rear top cover and for measuring the gap and interference of the overlapping area of ​​the two parts.

[0065] The outer panel assembly positioning bracket assembly includes a front top cover positioning bracket 2, a middle top cover positioning bracket 3, a left top cover positioning bracket 4, a right top cover positioning bracket 5, and a rear top cover positioning bracket 6. The front top cover positioning bracket 2, middle top cover positioning bracket 3, left top cover positioning bracket 4, right top cover positioning bracket 5, and rear top cover positioning bracket 6 are respectively fixed to the base plate 1 for inverted positioning of the front top cover, middle top cover, left top cover, right top cover, and rear top cover. The inner beam assembly positioning bracket assembly includes a middle top cover left... The longitudinal beam positioning bracket 7, the middle roof right longitudinal beam positioning bracket 8, the sunroof beam positioning bracket 9, the front roof left longitudinal beam positioning bracket 10, and the front roof right longitudinal beam positioning bracket, along with the middle roof left longitudinal beam positioning bracket 7, the middle roof right longitudinal beam positioning bracket 8, the sunroof beam positioning bracket 9, the front roof left longitudinal beam positioning bracket 10, and the front roof right longitudinal beam positioning bracket 11, are respectively fixed to the reference plate for the inverted positioning of the middle roof left longitudinal beam, the middle roof right longitudinal beam, the sunroof beam, the front roof left longitudinal beam, and the front roof right longitudinal beam.

[0066] The top cover positioning bracket 3 includes multiple top cover positioning clamps 3.1, see Figure 4 As shown, each top cover positioning fixture 3.1 includes a support base and a positioning component 13. The support base is fixed on the base plate 1, and the positioning components 13 are respectively disposed on the support base for positioning the top cover. At least some fixtures also include clamping components 14 and multiple adjusting shims. The clamping components 14 are used to clamp the top cover parts, and the adjusting shims are used to adapt to the positioning of parts of different heights of the top cover.

[0067] The rear top cover positioning bracket 6 includes a slide table 6.1, multiple slide rails 6.2, a locking pin 6.3, multiple supports 6.4, and a positioning assembly 13, see [link to details]. Figure 5 As shown, multiple slide rails 6.2 are fixed parallel to each other along the front-back direction on the base plate 1 at positions corresponding to the rear top cover. A slide table 6.1 is vertically slidably connected to the slide rails 6.2. The slide table 6.1 is provided with a first locking hole 6.11 and a second locking hole 6.12. A first fixing hole is provided on the base plate 1 below the first locking hole 6.11. A locking pin 6.3 can be simultaneously inserted into both the first locking hole 6.11 and the first fixing hole to position and lock the slide table 6.1. The base plate below the second locking hole 6.12... The slide 6.1 is provided with a second fixing hole, which is offset by 5mm from the second locking hole 6.12. The slide 6.1 moves backward by 5mm. The locking pin 6.3 can be inserted into the second locking hole 6.12 and the second fixing hole at the same time to position and lock the slide 6.1, so as to realize the positioning function of the rear top cover after moving backward by 5mm with the slide 6.1. The support 6.4 is respectively set on the slide 6.1, and the positioning component 13 and the clamping component 14 are respectively set on the corresponding support 6.4 for positioning the rear top cover.

[0068] The left top cover positioning bracket 4 and the right top cover positioning bracket 5 have symmetrical structures, see Figure 6 and Figure 7 As shown, both include a bracket, a positioning component 13, and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed at corresponding positions on the bracket. The bracket of the left top cover positioning bracket 4 and the bracket of the right top cover positioning bracket 5 are respectively fixed on the left and right sides of the base plate 1. The left top cover positioning bracket 4 is used to position the left top cover, and the right top cover positioning bracket 5 is used to position the right top cover.

[0069] The front roof positioning bracket 2 includes two front roof positioning clamps 2.1, see Figure 8 As shown, the two front cover positioning fixtures 2.1 are symmetrically structured. Each front cover positioning fixture includes a support base, a positioning component 13, and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed at corresponding positions on the support base. The two front cover positioning fixtures 2.1 are respectively disposed on the base plate 1 at positions corresponding to the front cover, and are used for inverted positioning of the front cover. Figure 9 , Figure 10 As shown, the front roof left longitudinal beam positioning bracket 10 and the front roof right longitudinal beam positioning bracket 11 have symmetrical structures. Both include a positioning component 13 and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively set at the corresponding positions of the bracket seats of the two front roof positioning fixtures 2.1. The front roof left longitudinal beam positioning bracket 10 is used for the inverted positioning of the front roof left longitudinal beam, and the front roof right longitudinal beam positioning bracket 11 is used for the inverted positioning of the front roof right longitudinal beam.

[0070] The positioning bracket 7 for the left longitudinal beam of the middle top cover and the positioning bracket 8 for the right longitudinal beam of the middle top cover have the same structure and are symmetrically arranged. See Figure 11 As shown, both include a support base, a positioning component 13, and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed at corresponding positions on the support base. The positioning bracket 7 for the left longitudinal beam of the middle top cover is used for the inverted positioning of the left longitudinal beam of the middle top cover, and the positioning bracket 8 for the right longitudinal beam of the middle top cover is used for the inverted positioning of the right longitudinal beam of the middle top cover.

[0071] The sunroof beam positioning bracket 9 includes a sunroof bracket base 9.1 and multiple sunroof beam inspection fixtures 9.2, see Figure 12 , Figure 13 As shown, the sunroof beam fixture 9.2 includes a positioning component 13 and a clamping component 14. The sunroof bracket base 9.1 is a cuboid structure fixed on the base plate 1 at the position corresponding to the sunroof. The sunroof beam fixture 9.2 is fixed on the sunroof bracket base 9.1 or on the base plate 1 around the sunroof bracket base 9.1. The positioning component 13 includes a movable positioning pin. The movable positioning pin includes a pin sleeve, a first pin body, and a second pin body. The first pin body is detachably fixedly connected to the upper part inside the pin sleeve and can be exposed on the upper end face of the pin sleeve. The second pin body is detachably fixedly connected to the lower part inside the pin sleeve and can be exposed on the lower end face of the pin sleeve.

[0072] Example 2:

[0073] A commercial vehicle high-roof inspection tool, see Figure 1 , Figure 2 , Figure 3 As shown, the system includes a base plate 1, an outer panel assembly positioning bracket assembly, and an inner beam assembly positioning bracket assembly. The outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly are respectively fixed at corresponding positions on the base plate 1. Both the outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly include a positioning component 13 and a clamping component 14. The outer panel assembly positioning bracket assembly is used to invert and position the outer panel assembly on the outer panel assembly positioning bracket assembly. The inner beam assembly positioning bracket assembly is used to invert and position the inner beam assembly on the inner beam assembly positioning bracket assembly, so that both the outer panel and the inner beam are exposed and measurable. The outer panel assembly positioning bracket assembly includes a sliding mechanism for the overall movement of the rear top cover and for measuring the gap and interference of the overlapping area of ​​the two parts.

[0074] The outer panel assembly positioning bracket assembly includes a front top cover positioning bracket 2, a middle top cover positioning bracket 3, a left top cover positioning bracket 4, a right top cover positioning bracket 5, and a rear top cover positioning bracket 6. The front top cover positioning bracket 2, middle top cover positioning bracket 3, left top cover positioning bracket 4, right top cover positioning bracket 5, and rear top cover positioning bracket 6 are respectively fixed to the base plate 1 for inverted positioning of the front top cover, middle top cover, left top cover, right top cover, and rear top cover. The inner beam assembly positioning bracket assembly includes a middle top cover left... The longitudinal beam positioning bracket 7, the middle roof right longitudinal beam positioning bracket 8, the sunroof beam positioning bracket 9, the front roof left longitudinal beam positioning bracket 10, and the front roof right longitudinal beam positioning bracket, along with the middle roof left longitudinal beam positioning bracket 7, the middle roof right longitudinal beam positioning bracket 8, the sunroof beam positioning bracket 9, the front roof left longitudinal beam positioning bracket 10, and the front roof right longitudinal beam positioning bracket 11, are respectively fixed to the reference plate for the inverted positioning of the middle roof left longitudinal beam, the middle roof right longitudinal beam, the sunroof beam, the front roof left longitudinal beam, and the front roof right longitudinal beam.

[0075] The top cover positioning bracket 3 includes multiple top cover positioning clamps 3.1, see Figure 4 As shown, each top cover positioning fixture 3.1 includes a support base and a positioning component 13. The support base is fixed on the base plate 1, and the positioning components 13 are respectively disposed on the support base for positioning the top cover. At least some fixtures also include clamping components 14 and multiple adjusting shims. The clamping components 14 are used to clamp the top cover parts, and the adjusting shims are used to adapt to the positioning of parts of different heights of the top cover.

[0076] The rear top cover positioning bracket 6 includes a slide table 6.1, multiple slide rails 6.2, a locking pin 6.3, multiple supports 6.4, and a positioning assembly 13, see [link to details]. Figure 5As shown, multiple slide rails 6.2 are fixed parallel to each other along the front-back direction on the base plate 1 at positions corresponding to the rear top cover. A slide table 6.1 is vertically slidably connected to the slide rails 6.2. The slide table 6.1 is provided with a first locking hole 6.11 and a second locking hole 6.12. A first fixing hole is provided on the base plate 1 below the first locking hole 6.11. A locking pin 6.3 can be simultaneously inserted into both the first locking hole 6.11 and the first fixing hole to position and lock the slide table 6.1. The base plate below the second locking hole 6.12... The slide 6.1 is provided with a second fixing hole, which is offset by 5mm from the second locking hole 6.12. The slide 6.1 moves backward by 5mm. The locking pin 6.3 can be inserted into the second locking hole 6.12 and the second fixing hole at the same time to position and lock the slide 6.1, so as to realize the positioning function of the rear top cover after moving backward by 5mm with the slide 6.1. The support 6.4 is respectively set on the slide 6.1, and the positioning component 13 and the clamping component 14 are respectively set on the corresponding support 6.4 for positioning the rear top cover.

[0077] The left top cover positioning bracket 4 and the right top cover positioning bracket 5 have symmetrical structures, see Figure 6 and Figure 7 As shown, both include a bracket, a positioning component 13, and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed at corresponding positions on the bracket. The bracket of the left top cover positioning bracket 4 and the bracket of the right top cover positioning bracket 5 are respectively fixed on the left and right sides of the base plate 1. The left top cover positioning bracket 4 is used to position the left top cover, and the right top cover positioning bracket 5 is used to position the right top cover.

[0078] The front roof positioning bracket 2 includes two front roof positioning clamps 2.1. The two front roof positioning clamps 2.1 are symmetrical in structure, see... Figure 8 As shown, each front cover positioning fixture includes a support base, a positioning component 13, and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed at corresponding positions on the support base. The two front cover positioning fixtures 2.1 are respectively disposed on the base plate 1 at positions corresponding to the front cover, and are used for inverted positioning of the front cover. The structures of the left longitudinal beam positioning bracket 10 and the right longitudinal beam positioning bracket 11 of the front cover are symmetrical, as shown in the figure. Figure 9 and Figure 10 As shown, both include a positioning component 13 and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed on the corresponding positions of the bracket seats of the two front top cover positioning fixtures 2.1. The front top cover left longitudinal beam positioning bracket 10 is used for the inverted positioning of the front top cover left longitudinal beam, and the front top cover right longitudinal beam positioning bracket 11 is used for the inverted positioning of the front top cover right longitudinal beam.

[0079] The positioning bracket 7 for the left longitudinal beam of the middle top cover and the positioning bracket 8 for the right longitudinal beam of the middle top cover have the same structure and are symmetrically arranged. See Figure 11As shown, both include a support base, a positioning component 13, and a clamping component 14. The positioning component 13 and the clamping component 14 are respectively disposed at corresponding positions on the support base. The positioning bracket 7 for the left longitudinal beam of the middle top cover is used for the inverted positioning of the left longitudinal beam of the middle top cover, and the positioning bracket 8 for the right longitudinal beam of the middle top cover is used for the inverted positioning of the right longitudinal beam of the middle top cover.

[0080] The sunroof beam positioning bracket 9 includes a sunroof bracket base 9.1 and multiple sunroof beam inspection fixtures 9.2, see Figure 12 and Figure 13 As shown, the sunroof beam fixture 9.2 includes a positioning component 13 and a clamping component 14. The sunroof bracket base 9.1 is a cuboid structure fixed on the base plate 1 at the position corresponding to the sunroof. The sunroof beam fixture 9.2 is fixed on the sunroof bracket base 9.1 or on the base plate 1 around the sunroof bracket base 9.1. The positioning component 13 includes a movable positioning pin. The movable positioning pin includes a pin sleeve, a first pin body, and a second pin body. The first pin body is detachably fixedly connected to the upper part inside the pin sleeve and can be exposed on the upper end face of the pin sleeve. The second pin body is detachably fixedly connected to the lower part inside the pin sleeve and can be exposed on the lower end face of the pin sleeve.

[0081] It also includes an auxiliary measuring ladder 12. The front end of the base plate 1 is also provided with a ladder support 1.1. One end of the auxiliary measuring ladder 12 is set on the ground outside the base plate 1. The middle part of the auxiliary measuring ladder 12 is fixed on the ladder support 1.1, and the other end is fixedly connected to the upper end face of the skylight support base 9.1 for the convenience of workers to perform measurement operations.

[0082] Example 3:

[0083] This invention also provides a matching method for a commercial vehicle high-roof inspection fixture, applied to the aforementioned commercial vehicle high-roof inspection fixture, comprising the following steps:

[0084] S1. Seal the stamped parts of the left longitudinal beam of the front roof, the right longitudinal beam of the front roof, the sunroof beam, the left longitudinal beam of the middle roof, and the right longitudinal beam of the middle roof respectively;

[0085] S2. Use a coordinate measuring machine to measure the dimensions of the overlapping area of ​​the stamped part;

[0086] S3. Use a feeler gauge to measure the gap in the overlapping area to identify areas of interference and excessive gaps (greater than 0.5 mm).

[0087] S4. Based on the coordinate measuring machine report of the stamped part, determine the problem area of ​​the stamped part;

[0088] S5. Manually repair the problem area to eliminate interference and excessive gaps;

[0089] S6. Drilling and riveting in the overlapping area to form the inner beam screw assembly;

[0090] S7. Use a coordinate measuring machine to measure the inner beam screw assembly, and remove the inner beam screw assembly after measurement;

[0091] S8. Seal the front top cover, middle top cover, rear top cover, left top cover, and right top cover stampings respectively;

[0092] S9. Use a coordinate measuring machine to measure the dimensions of the overlapping area of ​​the stamped part;

[0093] S10. Use a feeler gauge to measure the gap in the overlapping area to identify areas of interference and excessive gaps (greater than 0.5 mm).

[0094] S11. Based on the coordinate measuring machine report of the stamped part, determine the problem area of ​​the stamped part;

[0095] S12. Manually repair the problem area to eliminate interference and excessive gaps;

[0096] S13. Drilling and riveting in the overlapping area to form the outer plate screw assembly;

[0097] S14, Positioning inner beam screw assembly;

[0098] S15. Use a feeler gauge to measure the gap between the outer panel assembly and the inner beam assembly in the overlapping area, identify areas of interference and excessive gaps (greater than 0.5 mm).

[0099] S16. Based on the coordinate measuring machine (CMM) reports of the assembly and stamped parts, determine the problem area of ​​the stamped parts;

[0100] S17. Manually repair the problem area to eliminate interference and excessive gaps;

[0101] S18. Based on the amount of manual repair, issue formal mold modification instructions for the relevant stamping parts.

[0102] Example 4:

[0103] This embodiment uses the matching method of the commercial vehicle high-roof inspection fixture of the present invention to verify the matching of the middle roof and the rear roof. Poor fit between the middle and rear roofs can lead to uneven weld points, affecting the aesthetics, and in severe cases, causing leaks and weld cracking. High dimensional accuracy is required. Furthermore, the overlapping area has curved surfaces, making it difficult to ensure dimensional accuracy. The inspection fixture and method of the present invention are used to verify the matching of the overlapping area of ​​the middle and rear roofs, including the following steps:

[0104] Step 1: The positioning component of this invention includes a positioning pin and a positioning surface. The middle top cover positioning bracket 3 is adjusted by replacing the shims to compensate for material thickness, meeting different positioning requirements for the middle top cover. The middle top cover is then positioned and clamped. The clamping component of this invention includes C-clamps and a tightening nut. Part of the positioning surface of the middle top cover is located at the edge of the part, where it is clamped with the C-clamps and shares a positioning surface with the other part; some positioning surfaces rely on gravity to ensure contact.

[0105] Step 2: Establish a coordinate measuring machine system based on the reference of the fixture base plate 1, measure the overlap surface of the top cover and the rear top cover, set one detection point every 100mm in the straight area, and set one detection point every 20mm in the curved area, and generate a single-piece accuracy report.

[0106] Step 3: Insert the locking pin 6.3 of the rear top cover positioning bracket 6 into the first locking hole 6.11 at the theoretical position, i.e., the rear top cover is positioned at the theoretical position. Clamp the rear top cover, and tighten the positioning surface by tightening the nut or by clamping it with C-clamps;

[0107] Step 4: Establish a coordinate measuring machine system based on the reference of the fixture substrate 1, measure the overlapping surface of the top cover and the middle top cover, and ensure that the detection point position is consistent with the middle top cover to reduce analysis error and generate a single-piece accuracy report.

[0108] Step 5: After repositioning and clamping the top cover, use a feeler gauge to measure the overlap gap. The theoretical value of the gap is 0. Areas with a gap exceeding 0.5mm are the problem areas.

[0109] Step 6: Insert the locking pin 6.3 of the rear top cover positioning bracket 6 into the second locking hole 6.12, causing the entire rear top cover to move backward 5mm in the X direction. Measure the overlap gap again using a feeler gauge. The theoretical gap value is for two scenarios: 1) the overlap surface is parallel to the YZ plane, with a theoretical value of 5mm; 2) the overlap surface forms a certain angle with the YZ plane, with a theoretical value of 5cosα mm, where α is the acute angle between the overlap surface and the YZ plane, which can be measured based on the product's digital model. If the measured gap value is greater than 5cosα mm, the gap between the two parts is too large; if it is less than 5cosα mm, the two parts interfere, and the smaller amount is the interference amount.

[0110] Step 7: Perform deviation analysis. First, analyze the areas where the gap is smaller than the theoretical value, i.e., the interference areas. Based on the individual part accuracy reports of the two parts, the part with the deviation in the interference direction is the problem part. Manually repair it, and then remeasure the overlap gap until the tolerance requirements are met. Prioritize handling areas with larger interference. After manually eliminating the interference, re-insert the locking pin 6.3 into the theoretical position in the first locking hole 6.11 to ensure the rear top cover is positioned at the theoretical position. If there are still areas with larger gaps, continue analyzing these areas. Based on the individual part accuracy reports of the two parts, the part with the deviation in the gap direction is the problem part. Manually repair it, and then remeasure the overlap gap until the tolerance requirements are met. If manual repair or mold modification of the problem part is difficult, the other part can be manually repaired in the opposite direction.

[0111] Step 8: Drill holes in the overlapping area of ​​the middle top cover and the rear top cover, and rivet them together to form the top cover outer plate screw assembly, which is used for matching verification of the next level top cover assembly;

[0112] Step 9: After completing all verifications, disassemble the screw assembly and remeasure the hand-repaired area using a coordinate measuring machine. The measured value is the target value for mold correction.

[0113] This completes the matching verification of the overlapping area between the middle and rear roof covers.

[0114] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-roof inspection tool for commercial vehicles, characterized in that, The assembly includes a base plate (1), an outer panel assembly positioning bracket assembly and an inner beam assembly positioning bracket assembly. The outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly are respectively fixed at corresponding positions on the base plate (1). Both the outer panel assembly positioning bracket assembly and the inner beam assembly positioning bracket assembly include a positioning component (13) and a clamping component (14). The outer panel assembly positioning bracket assembly is used for inverted positioning of the outer panel assembly, and the inner beam assembly positioning bracket assembly is used for inverted positioning of the inner beam assembly, so that both the outer panel and the inner beam are exposed and measurable. The outer panel assembly positioning bracket assembly includes a sliding mechanism for the overall movement of the rear top cover and for measuring the gap and interference of the overlapping area of ​​the two parts.

2. The commercial vehicle high-roof inspection fixture according to claim 1, characterized in that, The outer panel assembly positioning bracket assembly includes a front top cover positioning bracket (2), a middle top cover positioning bracket (3), a left top cover positioning bracket (4), a right top cover positioning bracket (5), and a rear top cover positioning bracket (6). The front top cover positioning bracket (2), the middle top cover positioning bracket (3), the left top cover positioning bracket (4), the right top cover positioning bracket (5), and the rear top cover positioning bracket (6) are respectively fixed on the base plate (1) for inverted positioning of the front top cover, the middle top cover, the left top cover, the right top cover, and the rear top cover. The inner beam assembly positioning bracket assembly includes a middle top cover left top cover positioning bracket (6). The longitudinal beam positioning bracket (7), the middle roof right longitudinal beam positioning bracket (8), the skylight beam positioning bracket (9), the front roof left longitudinal beam positioning bracket (10), and the front roof right longitudinal beam positioning bracket (11) are respectively fixed on the reference plate for the inverted positioning of the middle roof left longitudinal beam, the middle roof right longitudinal beam, the skylight beam, the front roof left longitudinal beam, and the front roof right longitudinal beam.

3. The commercial vehicle high-roof inspection fixture according to claim 2, characterized in that, The top cover positioning bracket (3) includes multiple top cover positioning fixtures (3.1). Each top cover positioning fixture (3.1) includes a bracket base and a positioning component (13). The bracket is fixed on the base plate (1). The positioning components (13) are respectively disposed on the bracket base for positioning the top cover. At least some fixtures also include clamping components (14) and multiple adjusting shims. The clamping components (14) are used to clamp the top cover parts. The adjusting shims are used to adapt to the positioning of parts of different heights of the top cover.

4. The commercial vehicle high-roof inspection fixture according to claim 2, characterized in that, The rear top cover positioning bracket (6) includes a slide table (6.1), multiple slide rails (6.2), a locking pin (6.3), multiple supports (6.4), and a positioning assembly (13). The multiple slide rails (6.2) are fixed parallel to each other on the base plate (1) at intervals corresponding to the position of the rear top cover. The slide table (6.1) is vertically slidably connected to the slide rails (6.2). The slide table (6.1) is provided with a first locking hole (6.11) and a second locking hole (6.12). A first fixing hole is provided on the base plate (1) below the first locking hole (6.11). The locking pin (6.3) can be simultaneously inserted into both the first locking hole (6.11) and the first fixing hole for... The slide (6.1) is positioned and locked. A second fixing hole is provided on the base plate (1) below the second locking hole (6.12). The second fixing hole is offset by 5mm from the second locking hole (6.12). The slide (6.1) moves backward by 5mm. The locking pin (6.3) can be inserted into the second locking hole (6.12) and the second fixing hole at the same time to position and lock the slide (6.1), so as to realize the positioning function of the rear top cover after moving backward by 5mm with the slide (6.1). The support (6.4) is respectively set on the slide (6.1). The positioning component (13) and the clamping component (14) are respectively set on the corresponding support (6.4) for positioning the rear top cover.

5. The commercial vehicle high-roof inspection fixture according to claim 2, characterized in that, The left top cover positioning bracket (4) and the right top cover positioning bracket (5) are symmetrical in structure. Both include a bracket base, a positioning component (13) and a clamping component (14). The positioning component (13) and the clamping component (14) are respectively set at the corresponding positions of the bracket base. The bracket base of the left top cover positioning bracket (4) and the bracket base of the right top cover positioning bracket (5) are respectively fixed on the left and right sides of the base plate (1). The left top cover positioning bracket (4) is used to position the left top cover, and the right top cover positioning bracket (5) is used to position the right top cover.

6. The commercial vehicle high-roof inspection fixture according to claim 2, characterized in that, The front top cover positioning bracket (2) includes two front top cover positioning clamps (2.1). The two front top cover positioning clamps (2.1) are symmetrical in structure. Each front top cover positioning clamp includes a bracket base, a positioning component (13), and a clamping component (14). The positioning component (13) and the clamping component (14) are respectively disposed at corresponding positions on the bracket base. The two front top cover positioning clamps (2.1) are respectively disposed on the base plate (1) at positions corresponding to the front top cover, and are used for inverted positioning of the front top cover. The left longitudinal beam positioning bracket (10) and the right longitudinal beam positioning bracket (11) of the front top cover are symmetrical in structure. Both of them include a positioning component (13) and a clamping component (14). The positioning component (13) and the clamping component (14) are respectively set at the corresponding positions of the bracket seats of the two front top cover positioning fixtures (2.1). The left longitudinal beam positioning bracket (10) of the front top cover is used for the inverted positioning of the left longitudinal beam of the front top cover, and the right longitudinal beam positioning bracket (11) of the front top cover is used for the inverted positioning of the right longitudinal beam of the front top cover.

7. The commercial vehicle high-roof inspection fixture according to claim 2, characterized in that, The left longitudinal beam positioning bracket (7) and the right longitudinal beam positioning bracket (8) of the middle top cover have the same structure and are symmetrically arranged. Both include a bracket base, a positioning component (13) and a clamping component (14). The positioning component (13) and the clamping component (14) are respectively set at the corresponding positions of the bracket base. The left longitudinal beam positioning bracket (7) of the middle top cover is used for the inverted positioning of the left longitudinal beam of the middle top cover, and the right longitudinal beam positioning bracket (8) of the middle top cover is used for the inverted positioning of the right longitudinal beam of the middle top cover.

8. The commercial vehicle high-roof inspection fixture according to claim 2, characterized in that, The sunroof beam positioning bracket (9) includes a sunroof bracket base (9.1) and multiple sunroof beam gauges (9.2). The sunroof beam gauges (9.2) include a positioning component (13) / positioning component (13) and a clamping component (14). The sunroof bracket base (9.1) is a cuboid structure fixed on the base plate (1) at the position corresponding to the sunroof. The sunroof beam gauges (9.2) are respectively fixed on the sunroof bracket base (9.1) or on the base plate (1) around the sunroof bracket base (9.1). The positioning component (13) includes a movable positioning pin. The movable positioning pin includes a pin sleeve, a first pin body and a second pin body. The first pin body is detachably fixedly connected to the upper part inside the pin sleeve and exposed outside the upper end face of the pin sleeve. The second pin body is detachably fixedly connected to the lower part inside the pin sleeve and can be exposed outside the lower end face of the pin sleeve.

9. The commercial vehicle high-roof inspection fixture according to claim 1, characterized in that, It also includes an auxiliary measuring ladder (12), and the front end of the base plate (1) is also provided with a ladder support (1.1). One end of the auxiliary measuring ladder (12) is set on the ground outside the base plate (1), the middle part of the auxiliary measuring ladder (12) is fixed on the ladder support (1.1), and the other end is fixedly connected to the upper surface of the skylight support base (9.1) for the convenience of workers to perform measurement operations.

10. A matching method for a high-roof inspection fixture for commercial vehicles, characterized in that, The application to the commercial vehicle high-roof inspection fixture as described in any one of claims 1-9 includes the following steps: S1. Seal the stamped parts of the left longitudinal beam of the front roof, the right longitudinal beam of the front roof, the sunroof beam, the left longitudinal beam of the middle roof, and the right longitudinal beam of the middle roof respectively; S2. Use a coordinate measuring machine to measure the dimensions of the overlapping area of ​​the stamped part; S3. Use a feeler gauge to measure the gap in the overlapping area to identify areas of interference and excessive gaps (greater than 0.5 mm). S4. Based on the coordinate measuring machine report of the stamped part, determine the problem area of ​​the stamped part; S5. Manually repair the problem area to eliminate interference and excessive gaps; S6. Drilling and riveting in the overlapping area to form the inner beam screw assembly; S7. Use a coordinate measuring machine to measure the inner beam screw assembly, and remove the inner beam screw assembly after measurement; S8. Seal the front top cover, middle top cover, rear top cover, left top cover, and right top cover stampings respectively; S9. Use a coordinate measuring machine to measure the dimensions of the overlapping area of ​​the stamped part; S10. Use a feeler gauge to measure the gap in the overlapping area to identify areas of interference and excessive gaps (greater than 0.5 mm). S11. Based on the coordinate measuring machine report of the stamped part, determine the problem area of ​​the stamped part; S12. Manually repair the problem area to eliminate interference and excessive gaps; S13. Drilling and riveting in the overlapping area to form the outer plate screw assembly; S14, Positioning inner beam screw assembly; S15. Use a feeler gauge to measure the gap between the outer panel assembly and the inner beam assembly in the overlapping area, identify areas of interference and excessive gap, where the gap is greater than 0.5mm; S16. Based on the coordinate measuring machine (CMM) reports of the assembly and stamped parts, determine the problem area of ​​the stamped parts; S17. Manually repair the problematic area to eliminate interference and excessive gaps; S18. Based on the amount of manual repair, issue formal mold modification instructions for the relevant stamping parts.

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