Lower vehicle body matching sample frame and trial-manufacturing and mounting method

Abstract

The invention relates to the technical field of automobile production, in particular to a lower automobile body matching sample frame which comprises a bottom platform and a plurality of working sample frames, and each working sample frame comprises a bottom support, a moving assembly, a side support, a clamping assembly, a positioning assembly and a position calibration part. The invention further provides a lower vehicle body trial-manufacturing and mounting method. In the assembling process, the actual positioning welding and matching process of all parts can be completely reflected through the matching sample frame, then the matching error between all the parts or the rationality problem of installation point positions can be rapidly recognized, problem feedback can be rapidly carried out, the part optimization efficiency is improved, and the body-in-white part adaptation period is shortened; therefore, the established quality target is quickly achieved, the body-in-white trial-manufacturing efficiency is improved, and the new vehicle development period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile production, and more particularly to a lower vehicle body matching sample frame and a trial production and installation method. Background Art

[0002] With the continued penetration of new energy vehicles and the increase in car ownership, major automakers are increasingly upgrading their models to improve quality development efficiency in the manufacturing of new models. To quickly gain customer recognition and enhance quality competitiveness, automakers are required to shorten new vehicle development cycles while simultaneously improving component quality and body-in-white (BIW) precision. During the BIW trial production process, the lower body of the BIW is welded and assembled from approximately 38 parts, including the left and right front and rear longitudinal beams, left and right door sills, and left and right A-pillar inner panels. During the trial production phase, the pilot production line had a low level of automation, resulting in low investment costs and relatively simple fixtures. Currently, the industry utilizes existing fixtures to adapt and assemble parts. After the lower body is fully assembled, the component profiles, edges, and mounting hole locations are individually checked for installation errors. Error feedback is then provided, and parts are subsequently adjusted and optimized. Overall error verification results are poor, with long feedback cycles. This makes it difficult to quickly identify component issues and point placement issues. Fixture adjustments and part sizing are time-consuming, impacting the overall progress of the trial production phase and resulting in low overall production efficiency. Summary of the Invention

[0003] In order to overcome the defect of low production efficiency of lower body assembly in the white body trial production stage in the above-mentioned prior art, the present invention provides a lower body matching sample frame and a trial production installation method to improve production efficiency.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a lower body matching sample frame, comprising: a bottom platform and multiple working sample frames, the multiple working sample frames respectively include a bottom bracket movably connected to the bottom platform, a movable component respectively installed on both sides of the bottom bracket, a side bracket respectively installed on the movable end of the movable component, a clamping component and a positioning component respectively adjustably installed on the bottom bracket and the side bracket, and a position calibration piece respectively installed on the bottom bracket and the side bracket; the clamping component and the positioning component on the bottom bracket are respectively installed vertically, and the clamping component and the positioning component on the side bracket are respectively installed horizontally, the clamping component and the positioning component are used to clamp and position the lower body parts, the position calibration piece is used to provide an installation and positioning reference for the clamping component and the positioning component, the movable end of the movable component is provided with at least 2 fixed points, and the working sample frame has a moving function.

[0005] Each working sample frame can be used separately to clamp and position various parts of the lower body. After the parts are assembled into a parts assembly on each working sample frame, each working sample frame is installed together with the parts assembly on the bottom platform, and then the parts assemblies are assembled between each other to complete the installation of the entire lower body. In the working sample frame, the bottom bracket and the side bracket are installed with clamping components and positioning components according to the parts situation. Through the setting of the clamping components and positioning components, all parts of the lower body can be clamped and fixed, which is convenient for parts assembly and avoids the need to switch different fixtures during installation, thereby improving assembly efficiency. The side brackets are designed to increase the clamping and positioning of parts from above or from the side to improve the positioning accuracy of parts. At the same time, each side bracket is installed on the moving end of the moving component. When the side bracket is not needed, the side bracket can be removed. , and then fix the side bracket to prevent the side bracket from affecting the installation of other parts, which is conducive to further improving the installation efficiency. There are at least 2 fixed points on the mobile end to ensure basic usage needs, and multiple points can be set. The specific fixing method can be pins or screws, etc.; the mobile component preferably uses a guide rail component; at the same time, when installing each clamping component and positioning component on each working sample frame, the installation position is confirmed by the position calibration part respectively. Each clamping component and positioning component is installed vertically or horizontally to facilitate the confirmation of the specific installation position and improve the accuracy of the installation position. When assembling parts, first clamp and fix each part on the clamping component, and you can directly reversely confirm the installation error between the parts, which is convenient for workers to quickly identify parts problems and point rationality problems, further improve the trial assembly efficiency, and also improve the installation accuracy of each part.

[0006] Preferably, it also includes an adjustment component, which includes a mounting plate that can be adjustably mounted on the bottom bracket or the side bracket, a column that can be adjustably mounted on the mounting plate, a support plate detachably connected to the column, a fixing plate detachably connected to the support plate, an adjustment plate detachably connected to the fixing plate, a first adjustment plate arranged between the fixing plate and the adjustment plate, a component connecting block detachably connected to the adjustment plate, and a second adjustment plate, wherein limit blocks are respectively provided on the first side surface and the second side surface of the adjustment plate, the second adjustment plates are respectively arranged between the limit blocks and the side surfaces of the component connecting block, the first side surface and the second side surface are perpendicular to each other, and the clamping component and the positioning component are respectively installed on the component connecting block.

[0007] An adjustment component is provided to further improve the adjustable performance of the positioning component and the clamping component, and is also used to improve the positioning and clamping accuracy of the positioning component and the clamping component. Specifically, the mounting plate is adjustably connected to the bottom bracket or the side bracket for moving the clamping component or the positioning component over a large range. Furthermore, handles are installed on both sides of the mounting plate, and the handles are provided to facilitate lifting and removing the adjustment component, the clamping component and the positioning component together, so as to facilitate the replacement of the clamping component and the positioning component; the column plays a lifting role, and the lifting height is determined according to the condition of the parts. For lower parts, the column can also be omitted; the support plate plays a supporting role and also serves as a small mounting platform to simultaneously install and support multiple The positioning assembly or the clamping assembly, the first adjusting piece is arranged between the top of the first connecting plate and the bottom of the second connecting plate, and the height of the second connecting plate is adjusted by adding, reducing or replacing the first adjusting piece of the same or different thickness. Similarly, the second adjusting piece is arranged on the side of the limit block and the second connecting plate to adjust the horizontal and vertical position of the second connecting plate. The component connecting block is installed on the second connecting plate, and the positioning assembly and the clamping assembly are installed on the component connecting block. Then, the first adjusting piece and the second adjusting piece can be used to perform fine adjustment on the position of the positioning assembly and the clamping assembly, fully ensuring the installation accuracy of the positioning assembly and the clamping assembly, and thus ensuring the assembly accuracy of the lower body.

[0008] Preferably, the clamping assembly includes a first connecting rod connected to the component connecting block, a first clamping block connected to the first connecting rod, a second connecting rod connected to the first connecting rod, a second clamping block connected to the second connecting rod, a first bolt passing through the second clamping block and threadedly connected to the second connecting rod, a third connecting rod connected to the component connecting block, a fourth connecting rod connected to the third connecting rod, a second bolt threadedly connected to the fourth connecting rod, a limiting ring sleeved on the fourth connecting rod, a quick clamp connected to the fourth connecting rod, and a third clamping block connected to the clamping end of the quick clamp; the first clamping block, the second clamping block and the third clamping block are respectively provided with a contoured abutment surface, when the first bolt is tightened, the second clamping block moves toward the first clamping block and clamps the part, and when the quick clamp is clamped, the third clamping block moves toward the first clamping block and clamps the part.

[0009] The first connecting rod and the second connecting rod both play a connecting and extending role. The first clamping block and the second clamping block are working parts. The second clamping block is movably connected to the second connecting rod. Under the tightening adjustment of the first bolt, the second clamping block approaches the first clamping block and clamps the part. At the same time, a third clamping block is provided for clamping. The fourth connecting rod connected to the third clamping block can be adjusted in position relative to the third connecting rod, thereby adjusting the clamping distance of the third clamping block. The fourth connecting rod is axially positioned by a limit ring and circumferentially fixed by a fourth bolt. In addition, the third clamping block is driven by a quick clamp, and the clamping efficiency is higher. Quick clamps are common clamping mechanisms in the mechanical field. They can be divided into horizontal clamps and vertical clamps according to the clamping method, and can be divided into manual clamps or start clamps according to the driving method. The specific selection can be made as needed. The third clamping block also cooperates with the first clamping block for clamping, and is preferentially used for long-distance clamping. When the part clamping position is far away or the second clamping block interferes with the part, the third clamping block is used for clamping. In some cases where the contoured abutment surface of the first clamping block is large, the second clamping block and the third clamping block can also be used for clamping at the same time; at the same time, the first clamping block, the second clamping block and the third clamping block are respectively provided with contoured abutment surfaces, and the shape of the contoured abutment surfaces is contoured according to the part profile of the clamped part, so as to increase the contact area and improve the clamping stability.

[0010] Preferably, the clamping assembly also includes an adjusting block connected to the first connecting rod, a slider connected to the first clamping block, a third bolt threadedly connected to the slider, and an elastic member whose two ends abut against the first connecting rod and the third bolt respectively. The slider is slidably connected to the first connecting rod, and a transverse groove is provided on the first connecting rod. The adjusting block is slidably arranged in the transverse groove. The sliding directions of the slider and the adjusting block are perpendicular to each other. A plurality of adjusting working surfaces of different heights are provided on the top of the adjusting block. The slider abuts against the adjusting working surface under the elastic force of the elastic member.

[0011] The first clamping block can move relative to the first connecting rod along with the slider. When the slider slides toward the adjustment block, it will be restricted by the adjustment block, that is, it will abut against the adjustment working surface of the adjustment block. When the slider slides away from the adjustment block, it will compress the elastic member and will also be restricted by the third bolt. When the slider is not adjusted by external force, the bottom of the slider abuts against the adjustment working surface under the elastic force of the elastic member. Then, by moving the position of the adjustment block, the slider can abut against adjustment working surfaces at different heights respectively, and the position of the first clamping block can be quickly adjusted to achieve clamping of parts of different thicknesses. Furthermore, a slope is set between each adjustment working surface, and the adjustment block can be directly pushed or pulled during adjustment.

[0012] Preferably, the clamping assembly further includes a flower pin, and each of the bottom brackets is provided with a plurality of the flower pins.

[0013] The flower pin is a retractable pin structure used in the automotive field in the prior art. The flower pin has a clamping function and is used to use the hole to achieve internal clamping when the reference surface cannot clamp the product externally. There are two types: with positioning holes and without positioning holes. In this matching sample frame, the flower pin also serves as a supporting structure to perform internal clamping on the holes at the bottom of the lower body parts, and multiple ones are set to ensure the stability of support and clamping.

[0014] and a plurality of positioning pins, each of which is fixedly mounted on the support frame, and the plurality of positioning pins are connected to the support frame by a plurality of threaded holes.

[0015] A reference block is installed on the top of the vertical rod, and the first locating pin passes through the through hole of the reference block and is connected to the vertical rod. A positioning surface that matches the hole position of the part is provided on the working end of the first locating pin, and a supporting reference surface for supporting the part is provided on the top of the reference block. When the part is not placed, the lower pressing block is tightened and pressed down to contact the supporting reference surface. The first locating pin is wrapped inside, which protects the working end of the first locating pin and protects the positioning surface from being bumped, thereby ensuring positioning accuracy. When positioning the part, the part is fixed between the reference block and the lower pressing block by tightening and pressing the lower pressing block, which plays both a positioning role and a clamping role, with a better positioning effect and is suitable for positioning. The positioning hole is far away from the large sheet metal parts; at the same time, the first locating pin is set to be slidable and adjustable, and a ring is used to ensure the sliding accuracy, avoid the first locating pin from shaking, and ensure the positioning accuracy, and then drive the first locating pin by setting an adjusting rod, and set an L-shaped groove to limit the moving path of the adjusting rod, and also limit the moving distance of the first locating pin. The L-shaped groove is set to a positive L shape or an inverted L shape according to the specific situation. On this basis, a first bolt is set to fix the first locating pin. When the first locating pin is extended to the set position, the first bolt is tightened and abuts against the annular groove, so that the first locating pin remains fixed, fully ensuring the positioning accuracy of the first locating pin.

[0016] Preferably, the second positioning member includes a mounting block mounted on the component connecting block, a fixed block connected to the mounting block, a rotating rod rotatably connected to the fixed block, a second positioning pin detachably mounted on the rotating rod, and a fifth bolt passing through the rotating rod and threadedly connected to the fixed block, and the working end of the second positioning pin is located at the bottom.

[0017] The second locating pin is installed on the rotating rod and flips with the rotating rod, and the working end of the second locating pin is set at the bottom. Before use, the second locating pin is flipped, and then the part is placed on the matching sample rack, and then the second locating pin is flipped so that the second locating pin is inserted into the locating hole of the part from top to bottom, and then the second bolt is tightened to fix the second locating pin, thereby achieving the positioning of the part. The second locating pin is suitable for situations where positioning from the bottom up is not possible, such as for positioning a part installed on another part, or a double-layer stamped part with a locating hole only on the top.

[0018] Preferably, the working sample rack includes a front cabin sample rack, a front floor sample rack and a rear floor sample rack which are adjacently arranged on the bottom platform, and the side brackets of the front cabin sample rack and the rear floor sample rack are respectively installed with the hanging rings, and the rear floor sample rack also includes a tail bracket, and the rear of the rear floor sample rack is provided with the moving component, and the tail bracket is installed at the rear of the rear floor sample rack through the moving component, and the tail bracket is provided with the clamping component and the positioning component.

[0019] The working sample frame is divided into the front cabin sample frame, the front floor sample frame and the rear floor sample frame, which is conducive to the classification and graded assembly of the various parts of the lower body. A lifting ring is provided to facilitate the lifting of each working sample frame and place it on the bottom platform for the final assembly of each part assembly. The tail bracket on the rear floor sample frame is also installed with a clamping component and a positioning component for clamping and installing the rear bumper and related parts.

[0020] Preferably, the working sample frame also includes a moving wheel, a connecting member and a flip member respectively installed on the bottom bracket, a plurality of connecting holes are provided on the bottom platform, the connecting member is detachably connected to the connecting hole by screws, the moving wheel is installed on the flipping end of the flipping member, and after the flipping end of the flipping member is flipped, the moving wheel is completely received in the working sample frame.

[0021] The working sample frame is made movable by arranging moving wheels. When in use, after assembling the parts on the working sample frame, the working sample frame is hoisted onto the bottom platform using the lifting ring. The working sample frame is connected to the connecting holes on the bottom platform through connecting pieces, and bolt connection is preferably adopted for easy fixation and disassembly. At the same time, in order to avoid interference between the moving wheels on the working sample frame and the bottom platform, a flip piece is installed at the bottom of the working sample frame, and the moving wheels are installed on the flip end of the flip piece. When the working sample frame is placed between the bottom platforms, the moving wheels are retracted and fixed using the flip piece, and then the working sample frame is connected to the bottom platform.

[0022] A method for trial production and installation of a lower vehicle body, using the above-mentioned lower vehicle body matching sample frame, includes the following steps: Step 1: Divide the lower body parts into the front cabin assembly, front floor assembly and rear floor assembly, and divide the working sample frame into the front cabin sample frame, front floor sample frame and rear floor sample frame; Step 2: Using the BIW digital model, determine the clamping points, clamping profiles, and positioning points of each work sample frame according to the RPS positioning method. Then, design and determine the working positions of the corresponding clamping and positioning components on the work sample frame. Ensure that the clamping points or positioning points of each part during installation meet the RPS positioning method. Position calibration parts are also set on the work sample frame to complete the digital model of the work sample frame. Step 3: Divide the assembly sequence of all parts into layers. Based on the assembly level of each part, design corresponding replaceable clamping components or positioning components to avoid interference during assembly; Step 4: Manufacture and assemble the physical working prototypes based on the digital models of each working prototype. During assembly, use the various position calibration pieces as coordinate references to confirm the installation positions of each clamping component and positioning component. After assembly, recheck the actual installation positions of each clamping component and positioning component. Step 5: Use each work sample frame to assemble the parts of each assembly. During the assembly process, each part is clamped and fixed according to the clamping points and positioning points of the clamping assembly and positioning assembly. The installation errors between the installation positions of each part are confirmed and recorded. For parts with installation errors, the parts are directly polished and modified, and then assembled according to the clamping points and positioning points of the clamping assembly and positioning assembly. The installation errors of the parts in each assembly level are then verified step by step. Step 6: After assembling each assembly separately, install each working sample frame on the bottom platform and fix it in turn, assemble each assembly together, confirm and record the installation position error between each assembly, and then complete the overall assembly of the lower body; Step 7: Provide feedback on the recorded installation errors, optimize the dimensions or process parameters of each part, and manufacture the optimized parts; Step 8: Repeat steps 5 to 7 until the installation errors of the lower body parts are within the allowable error range, and then complete the final lower body assembly and the lower body trial assembly.

[0023] RPS stands for Reference Point System, which specifies the positioning principles and tolerance requirements that must be followed by fixtures, gauges, tooling, and other measuring equipment. This system's positioning methods are used to design and determine the clamping or positioning points of each clamping and positioning component, fully ensuring the design rationality of each point and improving part positioning accuracy and clamping effectiveness. Using this trial production installation method, simulated positioning is performed based on the theoretical installation position of the body-in-white, realistically simulating the actual welding and positioning process on site. During the installation process, key dimensional data such as the surface, edges, and mounting hole locations of each part can be directly identified, confirming the installation errors between parts. After assembly, error data can be directly fed back to optimize related parts and improve trial production efficiency.

[0024] Compared with the prior art, the present invention has the following beneficial effects: During the assembly process, this matching sample frame can fully reflect the actual positioning, welding and matching process of each part, and then quickly identify the matching errors between parts or the rationality of the installation points. It can quickly provide problem feedback, improve the efficiency of part optimization, shorten the white body part adaptation cycle, and quickly achieve the established quality goals, improve the efficiency of white body trial production, and shorten the new car development cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a lower vehicle body matching sample frame of the present invention; Figure 2 yes Figure 1 A magnified schematic diagram of part A; Figure 3 This is a side view structural diagram of a lower vehicle body matching sample frame of the present invention; Figure 4 This is a schematic diagram of the installation structure of the bottom bracket and the side bracket of the lower vehicle body matching sample frame of the present invention; Figure 5 This is a schematic diagram of a first embodiment of the structure of a clamping assembly for a lower vehicle body matching sample frame of the present invention; Figure 6 This is a schematic diagram of a second embodiment of the structure of a clamping assembly for a lower vehicle body matching sample frame of the present invention; Figure 7 It is a structural schematic diagram of an adjustment assembly for a lower vehicle body matching sample frame according to the present invention; Figure 8 This is an exploded view of a first positioning member of a lower vehicle body matching sample frame according to the present invention; Figure 9 This is a structural schematic diagram of a first positioning member of a lower vehicle body matching sample frame according to the present invention; Figure 10 This is a structural schematic diagram of a second positioning member of a lower vehicle body matching sample frame according to the present invention; Figure 11 This is a structural schematic diagram of a flip member for matching a sample frame with a lower vehicle body according to the present invention; Figure 12 It is a method flow chart of a lower vehicle body trial production and installation method of the present invention.

[0026] In the figure: 1. Bottom platform; 2. Working sample frame; 3. Bottom bracket; 4. Moving assembly; 5. Side bracket; 6. Clamping assembly; 601. First connecting rod; 601a. ​​Transverse groove; 602. First clamping block; 603. Second connecting rod; 604. Second clamping block; 605. First bolt; 606. Third connecting rod; 607. Fourth connecting rod; 608. Second bolt; 609. Limiting ring; 610. Quick clamp; 611. Third clamping block; 612. Adjusting block; 612a. Adjusting working surface; 613. Slider; 614. Third bolt; 615. Elastic member; 7. Positioning assembly; 8. Position calibration component; 9. Fixing component; 10. Lifting ring; 11. Moving wheel; 12. Adjustment assembly; 1201. Mounting plate; 1202. Handle; 1203. Column; 1204. Support plate; 1205. Fixing plate; 1206. Adjustment plate; 1206a. Limit block; 1207. First adjustment piece; 1208. Assembly connection block; 1209. Second adjustment piece; 13. Flowering expenses; 14. First positioning member; 1401. Vertical rod; 1401a. L-shaped groove; 1402. Reference block; 1402a. Support reference surface; 1403. First positioning pin; 1403a. Annular groove; 1404. Lower pressing block; 1405. Collar; 1406. Adjustment rod; 1407. Fourth bolt; 15. Second positioning member; 1501. Mounting block; 1502. Fixing block; 1503. Rotating rod; 1504. Second positioning pin; 1505. Fifth bolt; 16. Front cabin sample frame; 17. Front floor sample frame; 18. Rear floor sample frame; 19. Tail bracket; 20. Flip piece. DETAILED DESCRIPTION

[0027] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1 like Figure 1-4 As shown, a lower body matching sample rack comprises: a bottom platform 1 and a plurality of working sample racks 2, wherein the plurality of working sample racks 2 respectively comprise a bottom bracket 3 movably connected to the bottom platform 1, a moving assembly 4 respectively installed on both sides of the bottom bracket 3, a side bracket 5 respectively installed on the moving end of the moving assembly 4, a clamping assembly 6 and a positioning assembly 7 respectively adjustably installed on the bottom bracket 3 and the side bracket 5, and a position marking piece 8 respectively installed on the bottom bracket 3 and the side bracket 5; the clamping assembly 6 and the positioning assembly 7 on the bottom bracket 3 are respectively installed vertically, and the clamping assembly 6 and the positioning assembly 7 on the side bracket 5 are respectively installed horizontally, the clamping assembly 6 and the positioning assembly 7 are used to clamp and position the lower body parts, the position marking piece 8 is used to provide an installation and positioning reference for the clamping assembly 6 and the positioning assembly 7, the moving end of the moving assembly 4 is provided with at least 2 fixed points, and the working sample rack 2 has a moving function.

[0030] Each working sample frame 2 can be used separately, and is respectively used to clamp and position the parts of each part of the lower vehicle body. After the parts are assembled into a parts assembly on each working sample frame 2, each working sample frame 2 is installed together with the parts assembly on the bottom platform 1, and then the parts assemblies are assembled between each other to complete the installation of the entire lower vehicle body; in the working sample frame 2, the bottom bracket 3 and the side bracket 5 are installed with a clamping component 6 and a positioning component 7 according to the parts situation. Through the setting of the clamping component 6 and the positioning component 7, all parts of the lower vehicle body can be clamped and fixed, which is convenient for parts assembly and avoids the need to switch different jigs during installation, thereby improving assembly efficiency; the side bracket 5 is designed to increase the clamping and positioning of parts from above or from the side, thereby improving the positioning accuracy of parts. At the same time, each side bracket 5 is installed on the moving end of the moving component 4. When the side bracket 5 is not needed, the side bracket can be 5 is moved away, and then the side bracket 5 is fixed to prevent the side bracket 5 from affecting the installation of other parts, which is conducive to further improving the installation efficiency. There are at least 2 fixed points on the mobile end to ensure basic use requirements. Multiple points can also be set. The specific fixing method can be pins or screws, etc.; the mobile component 4 preferably uses a guide rail component; at the same time, when each clamping component 6 and positioning component 7 is installed on each working sample frame 2, the installation position is confirmed by the position calibration part 8 respectively. Each clamping component 6 and positioning component 7 is installed vertically or horizontally to facilitate the confirmation of the specific installation position and improve the accuracy of the installation position. When assembling parts, first clamp and fix each part on the clamping component 6, and the installation error between the parts can be directly reversely confirmed, which is convenient for workers to quickly identify parts problems and point rationality problems, further improve the trial assembly efficiency, and also improve the installation accuracy of each part.

[0031] The beneficial effects of this embodiment are as follows: During the assembly process, the actual positioning, welding and matching process of each part can be fully reflected through this matching sample frame, so that the matching errors between the parts or the rationality of the installation points can be quickly identified, and problem feedback can be quickly performed, thereby improving the efficiency of part optimization, shortening the adaptation cycle of the body-in-white parts, and thus quickly achieving the established quality goals, improving the efficiency of the body-in-white trial production, and shortening the new car development cycle.

[0032] Example 2 This embodiment is further limited on the basis of the embodiment 1, and the difference between this embodiment and the embodiment 1 is that: like Figure 5-7As shown, it also includes an adjustment component 12, which includes a mounting plate 1201 that can be adjustably mounted on the bottom bracket 3 or the side bracket 5, handles 1202 respectively mounted on both sides of the mounting plate 1201, a column 1203 that can be adjustably mounted on the mounting plate 1201, a support plate 1204 detachably connected to the column 1203, a fixing plate 1205 detachably connected to the support plate 1204, an adjustment plate 1206 detachably connected to the fixing plate 1205, a first adjustment piece 1207 arranged between the fixing plate 1205 and the adjustment plate 1206, a component connecting block 1208 detachably connected to the adjustment plate 1206, and a second adjustment piece 1209. Limit blocks 1206a are respectively provided on the first and second side surfaces of the adjustment plate 1206. The second adjustment piece 1209 is respectively arranged between the limit block 1206a and the side surface of the component connecting block 1208. The first side surface and the second side surface are perpendicular to each other. The clamping component 6 and the positioning component 7 are respectively mounted on the component connecting block 1208.

[0033] The adjusting component 12 is provided to further improve the adjustable performance of the positioning component 7 and the clamping component 6, and is also used to improve the positioning and clamping accuracy of the positioning component 7 and the clamping component 6. Specifically, the mounting plate 1201 is adjustably connected to the bottom bracket 3 or the side bracket 5, and is used to move the clamping component 6 or the positioning component 7 over a large range. Furthermore, handles 1202 are installed on both sides of the mounting plate 1201. The handles 1202 are provided to facilitate lifting and removing the adjusting component 12, the clamping component 6 and the positioning component 7 together, so as to facilitate replacement of the clamping component 6 and the positioning component 7; the column 1203 has a lifting effect, and the lifting height is determined according to the condition of the parts. For lower parts, the column 1203 can also be omitted; the support plate 1204 has a supporting effect and also serves as a small mounting platform to simultaneously install and support multiple A positioning component 7 or a clamping component 6, a first adjusting piece 1207 is arranged between the top of the first connecting plate and the bottom of the second connecting plate, and the height of the second connecting plate is adjusted by adding, reducing or replacing the first adjusting piece 1207 of the same or different thickness. Similarly, a second adjusting piece 1209 is set on the side of the limit block 1206a and the second connecting plate to adjust the horizontal and vertical position of the second connecting plate, the component connecting block 1208 is installed on the second connecting plate, and the positioning component 7 and the clamping component 6 are installed on the component connecting block 1208, and then the first adjusting piece 1207 and the second adjusting piece 1209 can be used to perform fine adjustment on the position of the positioning component 7 and the clamping component 6, fully ensuring the installation accuracy of the positioning component 7 and the clamping component 6, and thus ensuring the assembly accuracy of the lower body.

[0034] like Figure 5-6As shown, further, the clamping assembly 6 includes a first connecting rod 601 connected to the assembly connecting block 1208, a first clamping block 602 connected to the first connecting rod 601, a second connecting rod 603 connected to the first connecting rod 601, a second clamping block 604 connected to the second connecting rod 603, a first bolt 605 passing through the second clamping block 604 and threadedly connected to the second connecting rod 603, a third connecting rod 606 connected to the assembly connecting block 1208, a fourth connecting rod 607 connected to the third connecting rod 606, and a fourth connecting rod 607 threadedly connected to the fourth connecting rod 607. The second connecting bolt 608 is connected, the limiting ring 609 is mounted on the fourth connecting rod 607, the quick clamp 610 is connected to the fourth connecting rod 607, and the third clamping block 611 is connected to the clamping end of the quick clamp 610; the first clamping block 602, the second clamping block 604 and the third clamping block 611 are respectively provided with a contoured abutment surface. When the first bolt 605 is tightened, the second clamping block 604 moves toward the first clamping block 602 and clamps the part. When the quick clamp 610 is clamped, the third clamping block 611 moves toward the first clamping block 602 and clamps the part. The clamping assembly 6 also includes an adjustment block 612 connected to the first connecting rod 601, a slider 613 connected to the first clamping block 602, a third bolt 614 threadedly connected to the slider 613, and an elastic member 615 with both ends respectively abutting against the first connecting rod 601 and the third bolt 614. The slider 613 is slidably connected to the first connecting rod 601, and a transverse groove 601a is provided on the first connecting rod 601. The adjustment block 612 is slidably set in the transverse groove 601a. ​​The sliding directions of the slider 613 and the adjustment block 612 are perpendicular to each other. A plurality of adjustment working surfaces 612a of different heights are provided on the top of the adjustment block 612. The slider 613 abuts against the adjustment working surface 612a under the elastic force of the elastic member 615. Figure 4 As shown, the clamping assembly 6 further includes a flower pin 13 , and each bottom bracket 3 is provided with a plurality of flower pins 13 .

[0035] The first connecting rod 601 and the second connecting rod 603 both serve to connect and extend. The first clamping block 602 and the second clamping block 604 are working parts. The second clamping block 604 is movably connected to the second connecting rod 603. When the first bolt 605 is tightened and adjusted, the second clamping block 604 approaches the first clamping block 602 and clamps the part. At the same time, a third clamping block 611 is provided for clamping. The fourth connecting rod 607 connected to the third clamping block 611 can be adjusted in position relative to the third connecting rod 606, thereby adjusting the clamping distance of the third clamping block 611. The fourth connecting rod 607 is axially positioned by a limit ring 609 and circumferentially fixed by a fourth bolt 1407. In addition, the third clamping block 611 is driven by a quick clamp 610, which has higher clamping efficiency. The quick clamp 610 is a common clamping mechanism in the mechanical field. It can be divided into horizontal clamps and vertical clamps according to the clamping method, and can be divided into manual clamps or start-up clamps according to the driving method. The specific selection can be made as needed. The third clamping block 611 also cooperates with the first clamping block 602 for clamping, and is preferably used for long-distance clamping. When the part clamping position is far away or the second clamping block 604 interferes with the part, the third clamping block 611 is used for clamping. In some cases where the contoured abutment surface of the first clamping block 602 is large, the second clamping block 604 and the third clamping block 611 can also be used for clamping at the same time; at the same time, the first clamping block 602, the second clamping block 604 and the third clamping block 611 are respectively provided with contoured abutment surfaces, and the shape of the contoured abutment surfaces is contoured according to the part profile of the clamped part, so as to increase the contact area and improve the clamping stability.

[0036] The first clamping block 602 can move relative to the first connecting rod 601 along with the slider 613. When the slider 613 slides toward the adjustment block 612, it is restricted by the adjustment block 612, that is, it abuts against the adjustment working surface 612a of the adjustment block 612. When the slider 613 slides away from the adjustment block 612, it compresses the elastic member 615 and is also restricted by the third bolt 614. When the slider 613 is not adjusted by external force, the elastic force of the elastic member 615 causes the bottom of the slider 613 to abut against the adjustment working surface 612a. By moving the position of the adjustment block 612, the slider 613 can abut against the adjustment working surfaces 612a at different heights, thereby quickly adjusting the position of the first clamping block 602 to clamp parts of different thicknesses. Furthermore, a slope is provided between each adjustment working surface 612a, so that the adjustment block 612 can be directly pushed or pulled during adjustment.

[0037] The flower pin 13 is a retractable pin structure used in the automotive field in the prior art. The flower pin 13 has a pressing function and is used to achieve internal pressing using the hole when the reference surface cannot press the product externally. There are two types of flower pins, one with positioning holes and the other without positioning holes. In this matching sample frame, the flower pin 13 also serves as a supporting structure to internally press the holes at the bottom of the lower body parts. Multiple flower pins are set to ensure the stability of support and clamping. Figure 4 Each working sample rack 2 is respectively provided with a plurality of blooming pins 13.

[0038] Furthermore, the moving assembly 4 includes a guide rail assembly and a fixing member 9, and the side bracket 5 is installed on the slider 613 of the guide rail assembly. The fixing member 9 preferably adopts a pin, and pin holes are respectively provided on the side bracket 5 and the bottom bracket 3, so that the side bracket 5 can be fixed at different positions of the bottom bracket 3 respectively.

[0039] The remaining features and working principles of this embodiment are consistent with those of embodiment 1.

[0040] Example 3 Based on Example 1 or Example 2, Example 1 or Example 2 is further limited, and the difference is that: like Figure 8-10As shown, the positioning assembly 7 includes a first positioning member 14 and a second positioning member 15. The first positioning member 14 includes a vertical rod 1401 installed on the assembly connection block 1208, a reference block 1402 and a first positioning pin 1403 respectively connected to the vertical rod 1401, a lower pressure block 1404 threadedly connected to the first positioning pin 1403, a collar 1405, an adjusting rod 1406 and a fourth bolt 1407. The reference block 1402 is provided with a through hole at the axis center and a support reference surface 1402a at the top. The first positioning pin 1403 is located at the axis center of the reference block 1402, a threaded hole is provided at the axis center of the top of the first positioning pin 1403, and the lower pressure block 1404 is provided with a threaded hole at the bottom axis. A groove is provided at the center, and when the lower pressure block 1404 is tightened, the bottom abuts against the support reference surface 1402a. The vertical rod 1401 is a hollow structure and two rings 1405 are provided at the axis center. The first positioning pin 1403 is slidingly connected to the ring 1405. An L-shaped groove 1401a is provided on the side of the vertical rod 1401. The adjusting rod 1406 passes through the L-shaped groove 1401a and is connected to the first positioning pin 1403. The first positioning pin 1403 is provided with an annular groove 1403a. The fourth bolt 1407 is threadedly connected to the vertical rod 1401 and passes through the vertical rod 1401. When the first positioning pin 1403 moves to the set position, the fourth bolt 1407 abuts against the annular groove 1403a. The second positioning member 15 includes a mounting block 1501 mounted on the component connecting block 1208, a fixed block 1502 connected to the mounting block 1501, a rotating rod 1503 rotatably connected to the fixed block 1502, a second positioning pin 1504 detachably mounted on the rotating rod 1503, and a fifth bolt 1505 passing through the rotating rod 1503 and threadedly connected to the fixed block 1502. The working end of the second positioning pin 1504 is located at the bottom.

[0041] A reference block 1402 is installed on the top of the vertical rod 1401, and a first locating pin 1403 passes through the through hole of the reference block 1402 and is connected to the vertical rod 1401. A positioning surface that matches the part hole position is provided on the working end of the first locating pin 1403, and a supporting reference surface 1402a for supporting the part is provided on the top of the reference block 1402. When the part is not placed, the lower pressing block 1404 is tightened and pressed down to contact the supporting reference surface 1402a. The first locating pin 1403 is wrapped inside, which protects the working end of the first locating pin 1403 and protects the positioning surface from being bumped, thereby ensuring positioning accuracy. When positioning the part, the part is fixed between the reference block 1402 and the lower pressing block 1404 by tightening and pressing the lower pressing block 1404, which not only plays a positioning role, but also a clamping role, with a better positioning effect, and is suitable for positioning. Large sheet metal parts with farther holes; at the same time, the first locating pin 1403 is set to be slidably adjustable, and the sleeve 1405 is used to ensure the sliding accuracy, avoid the first locating pin 1403 from shaking, and ensure the positioning accuracy, and then drive the first locating pin 1403 by setting the adjusting rod 1406, and set the L-shaped groove 1401a to limit the moving path of the adjusting rod 1406, and also limit the moving distance of the first locating pin 1403. The L-shaped groove 1401a is set to a positive L shape or an inverted L shape according to the specific situation. On this basis, a first bolt 605 is set to fix the first locating pin 1403. When the first locating pin 1403 is extended to the set position, the first bolt 605 is tightened and abuts against the annular groove 1403a, so that the first locating pin 1403 remains fixed, fully ensuring the positioning accuracy of the first locating pin 1403. The second locating pin 1504 is installed on the rotating rod 1503 and flips together with the rotating rod 1503, and the working end of the second locating pin 1504 is set at the bottom. Before use, the second locating pin 1504 is flipped, and then the part is placed on the matching sample rack, and then the second locating pin 1504 is flipped again, so that the second locating pin 1504 is inserted into the locating hole of the part from top to bottom, and then the second bolt 608 is tightened to fix the second locating pin 1504, thereby achieving the positioning of the part. The second locating pin 1504 is suitable for situations where positioning from the bottom up is not possible, such as for positioning a part installed on another part, or a double-layer stamped part with a locating hole only on the top.

[0042] like Figure 1-3As shown, further, the working sample frame 2 includes a front cabin sample frame 16, a front floor sample frame 17 and a rear floor sample frame 18 adjacent to each other on the bottom platform 1, and the bottom brackets 3 of the front cabin sample frame 16, the front floor sample frame 17 and the rear floor sample frame 18 are all provided with hanging rings 10, and the side brackets 5 of the front cabin sample frame 16 and the rear floor sample frame 18 are also installed with hanging rings 10. The rear floor sample frame 18 also includes a tail bracket 19, and a moving component 4 is provided at the tail of the rear floor sample frame 18. The tail bracket 19 is installed at the tail of the rear floor sample frame 18 through the moving component 4, and a clamping component 6 and a positioning component 7 are provided on the tail bracket 19.

[0043] The working sample frame 2 is divided into a front cabin sample frame 16, a front floor sample frame 17 and a rear floor sample frame 18, which is conducive to the classification and hierarchical assembly of the various parts of the lower body. A lifting ring 10 is provided to facilitate the lifting of each working sample frame 2 and place it on the bottom platform 1 for the final assembly of each part assembly. The tail bracket 19 on the rear floor sample frame is also installed with a clamping component 6 and a positioning component 7 for clamping and installing the rear bumper and related parts.

[0044] like Figure 11 As shown, the working sample rack 2 further includes a moving wheel 11, a connecting member, and a flip member 20, which are respectively mounted on the bottom bracket 3. The bottom platform 1 is provided with a plurality of connecting holes, and the connecting member is detachably connected to the connecting holes by screws. The moving wheel 11 is mounted on the flip end of the flip member 20. After the flip end of the flip member 20 is flipped, the moving wheel 11 is completely stored in the working sample rack 2. Specifically, the connecting member is provided with a through hole, and the connecting hole on the bottom platform 1 is a threaded hole. The connecting member is fixed to the connecting block with screws to complete the fixing of the working sample rack 2.

[0045] The working sample frame 2 is movable by providing moving wheels 11. When in use, after assembling the various parts on the working sample frame 2, the working sample frame 2 is hoisted to the bottom platform 1 using the lifting ring 10. The working sample frame 2 is connected to the connecting holes on the bottom platform 1 through connecting parts, and bolt connection is preferably adopted for easy fixation and disassembly. At the same time, in order to avoid interference between the moving wheels 11 on the working sample frame 2 and the bottom platform 1, a flip piece 20 is installed at the bottom of the working sample frame 2, and the moving wheels 11 are installed on the flip end of the flip piece 20. When the working sample frame 2 is placed between the bottom platform 1, the moving wheels 11 are retracted and fixed using the flip piece 20, and then the working sample frame 2 is connected to the bottom platform 1.

[0046] The rest of the working principle and working process of this embodiment are consistent with those of embodiment 1 or embodiment 2.

[0047] Example 4 like Figure 12 As shown, a method for trial production and installation of a lower vehicle body, using a lower vehicle body matching sample frame of the above-mentioned embodiments 1-3, includes the following steps: Step 1: Divide the lower body parts into the front cabin assembly, the front floor assembly and the rear floor assembly, and divide the working sample frame 2 into the front cabin sample frame 16, the front floor sample frame 17 and the rear floor sample frame 18; Step 2: Using the digital model of the body-in-white, determine the clamping points, clamping profiles, and positioning points of each working sample frame 2 according to the RPS positioning method. Then, design and determine the working positions of the corresponding clamping components 6 and positioning components 7 on the working sample frame 2, so that the clamping points or positioning points of each part at various locations during installation meet the RPS positioning method. At the same time, set position calibration components 8 on the working sample frame 2 to complete the digital model of the working sample frame 2; Step 3: Divide the assembly sequence of all parts into layers, and design corresponding replaceable clamping components 6 or positioning components 7 based on the assembly level of each part to avoid interference during assembly; Step 4: Manufacture and assemble the physical working sample frames 2 according to the digital models of the working sample frames 2. During assembly, use the position calibration pieces 8 as coordinate references to confirm the installation positions of the clamping components 6 and positioning components 7. After assembly, recheck the actual installation positions of the clamping components 6 and positioning components 7. Step 5: Use each working sample frame 2 to assemble the parts of each assembly. During the assembly process, each part is clamped and fixed according to the clamping points and positioning points of the clamping component 6 and the positioning component 7. The installation errors between the installation positions of the parts are confirmed and recorded. For parts with installation errors, the parts are directly polished and modified, and then assembled according to the clamping points and positioning points of the clamping component 6 and the positioning component 7. Then, the installation errors of the parts in each assembly level are verified step by step. Step 6: After assembling each assembly separately, install each working sample frame 2 on the bottom platform 1 and fix it in turn, assemble each assembly together, confirm and record the installation position error between each assembly, and then complete the overall assembly of the lower body; Step 7: Provide feedback on the recorded installation errors, optimize the dimensions or process parameters of each part, and manufacture the optimized parts; Step 8: Repeat steps 5 to 7 until the installation errors of the lower body parts are within the allowable error range, and then complete the final lower body assembly and the lower body trial assembly.

[0048] RPS stands for Reference Point System, which specifies the positioning principles and tolerance requirements that must be followed by fixtures, gauges, tooling, and other measuring equipment. This system's positioning methods are used to design and determine the clamping or positioning points of each clamping component 6 and positioning component 7, fully ensuring the design rationality of each point and improving part positioning accuracy and clamping effectiveness. Using this pilot installation method, simulated positioning is performed based on the theoretical installation position of the body-in-white, realistically simulating the actual welding and positioning process on site. During the installation process, key dimensional data such as the surface, edges, and mounting hole locations of each part can be directly identified, confirming the installation errors between parts. After assembly, direct feedback of the error data is provided to optimize the relevant parts and improve pilot production efficiency.

[0049] Furthermore, a laser tracker is used to determine and verify the installation positions of each clamping assembly 6 and positioning assembly 7 .

[0050] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A lower vehicle body matching sample frame, characterized in that: include: A bottom platform (1) and a plurality of working sample racks (2), wherein the plurality of working sample racks (2) respectively comprise a bottom bracket (3) movably connected to the bottom platform (1), a moving assembly (4) respectively mounted on both sides of the bottom bracket (3), a side bracket (5) respectively mounted on the moving end of the moving assembly (4), a clamping assembly (6) and a positioning assembly (7) respectively adjustably mounted on the bottom bracket (3) and the side bracket (5), and a position calibration piece (8) respectively mounted on the bottom bracket (3) and the side bracket (5); The clamping assembly (6) and the positioning assembly (7) on the bottom bracket (3) are respectively installed vertically, and the clamping assembly (6) and the positioning assembly (7) on the side bracket (5) are respectively installed horizontally. The clamping assembly (6) and the positioning assembly (7) are used to clamp and position the lower body parts. The position calibration member (8) is used to provide an installation positioning reference for the clamping assembly (6) and the positioning assembly (7). The moving end of the moving assembly (4) is provided with at least two fixed points, and the working sample frame (2) has a moving function.

2. The lower vehicle body matching sample frame according to claim 1, characterized in that: The device further comprises an adjustment assembly (12), wherein the adjustment assembly (12) comprises a mounting plate (1201) that is adjustably mounted on the bottom bracket (3) or the side bracket (5), a column (1203) that is adjustably mounted on the mounting plate (1201), a support plate (1204) that is detachably connected to the column (1203), a fixing plate (1205) that is detachably connected to the support plate (1204), an adjustment plate (1206) that is detachably connected to the fixing plate (1205), and a support plate (1206) that is disposed between the fixing plate (1205) and the adjustment plate (1206). The present invention relates to a first adjusting piece (1207), a component connecting block (1208) detachably connected to the adjusting plate (1206), and a second adjusting piece (1209), wherein the first side surface and the second side surface of the adjusting plate (1206) are respectively provided with a limit block (1206a), and the second adjusting piece (1209) is respectively arranged between the limit block (1206a) and the side surface of the component connecting block (1208), the first side surface and the second side surface are perpendicular to each other, and the clamping component (6) and the positioning component (7) are respectively installed on the component connecting block (1208).

3. The lower vehicle body matching sample frame according to claim 2, characterized in that: The clamping assembly (6) includes a first connecting rod (601) connected to the assembly connecting block (1208), a first clamping block (602) connected to the first connecting rod (601), a second connecting rod (603) connected to the first connecting rod (601), a second clamping block (604) connected to the second connecting rod (603), a first bolt (605) passing through the second clamping block (604) and threadedly connected to the second connecting rod (603), a third connecting rod (606) connected to the assembly connecting block (1208), a fourth connecting rod (607) connected to the third connecting rod (606), and a second connecting rod (608) threadedly connected to the fourth connecting rod (608). A bolt (608), a limiting ring (609) sleeved on the fourth connecting rod (607), a quick clamp (610) connected to the fourth connecting rod (607), and a third clamping block (611) connected to the clamping end of the quick clamp (610); the first clamping block (602), the second clamping block (604) and the third clamping block (611) are respectively provided with a contoured abutment surface, when the first bolt (605) is tightened, the second clamping block (604) moves toward the first clamping block (602) and clamps the part, and when the quick clamp (610) is clamped, the third clamping block (611) moves toward the first clamping block (602) and clamps the part.

4. The lower vehicle body matching sample frame according to claim 3, characterized in that: The clamping assembly (6) further comprises an adjusting block (612) connected to the first connecting rod (601), a slider (613) connected to the first clamping block (602), a third bolt (614) threadedly connected to the slider (613), and an elastic member (615) with two ends respectively abutting against the first connecting rod (601) and the third bolt (614), wherein the slider (613) is slidably connected to the first connecting rod (601), a transverse groove (601a) is provided on the first connecting rod (601), the adjusting block (612) is slidably arranged in the transverse groove (601a), the sliding directions of the slider (613) and the adjusting block (612) are perpendicular to each other, a plurality of adjusting working surfaces (612a) of different heights are provided on the top of the adjusting block (612), and the slider (613) abuts against the adjusting working surface (612a) under the elastic force of the elastic member (615).

5. The lower vehicle body matching sample frame according to claim 3, characterized in that: The clamping assembly (6) further comprises a blooming pin (13), and each of the bottom brackets (3) is provided with a plurality of the blooming pins (13).

6. The lower vehicle body matching sample frame according to claim 2, characterized in that: The positioning assembly (7) includes a first positioning member (14) and a second positioning member (15), the first positioning member (14) including a vertical rod (1401) mounted on the assembly connecting block (1208), a reference block (1402) and a first positioning pin (1403) respectively connected to the vertical rod (1401), a lower pressing block (1404) threadedly connected to the first positioning pin (1403), a collar (1405), an adjusting rod (1406) and a fourth bolt (1407), the reference block (1402) having a through hole at its axis and a support reference surface (1402a) at its top, the first positioning pin (1403) being located at the axis of the reference block (1402), a threaded hole being provided at the axis of the top of the first positioning pin (1403), and a groove being provided at the axis of the bottom of the lower pressing block (1404). When the lower pressing block (1404) is tightened, the bottom thereof abuts against the supporting reference surface (1402a); the vertical rod (1401) is a hollow structure and two said collars (1405) are provided at the axis; the first positioning pin (1403) is slidably connected with the said collars (1405); an L-shaped groove (1401a) is provided on the side of the vertical rod (1401); the adjusting rod (1406) passes through the L-shaped groove (1401a) and is connected with the first positioning pin (1403); an annular groove (1403a) is provided on the first positioning pin (1403); the fourth bolt (1407) is threadedly connected with the vertical rod (1401) and passes through the vertical rod (1401); when the first positioning pin (1403) moves to the set position, the fourth bolt (1407) abuts against the said annular groove (1403a).

7. The lower vehicle body matching sample frame according to claim 6, characterized in that: The second positioning member (15) includes a mounting block (1501) mounted on the component connecting block (1208), a fixing block (1502) connected to the mounting block (1501), a rotating rod (1503) rotatably connected to the fixing block (1502), a second positioning pin (1504) detachably mounted on the rotating rod (1503), and a fifth bolt (1505) passing through the rotating rod (1503) and threadedly connected to the fixing block (1502). The working end of the second positioning pin (1504) is located at the bottom.

8. The lower vehicle body matching sample frame according to claim 1, characterized in that: The working sample frame (2) includes a front cabin sample frame (16), a front floor sample frame (17) and a rear floor sample frame (18) which are adjacently arranged on the bottom platform (1); the bottom brackets (3) of the front cabin sample frame (16), the front floor sample frame (17) and the rear floor sample frame (18) are all provided with a lifting ring (10); the side brackets (5) of the front cabin sample frame (16) and the rear floor sample frame (18) are also installed with the lifting ring (10); the rear floor sample frame (18) further includes a tail bracket (19); the rear end of the rear floor sample frame (18) is provided with the moving component (4); the tail bracket (19) is installed at the rear end of the rear floor sample frame (18) through the moving component (4); the tail bracket (19) is provided with the clamping component (6) and the positioning component (7).

9. The lower vehicle body matching sample frame according to claim 1, characterized in that: The working sample rack (2) further comprises a moving wheel (11), a connecting member and a flip member (20) respectively mounted on the bottom bracket (3); a plurality of connecting holes are provided on the bottom platform (1); the connecting member is detachably connected to the connecting holes by screws; the moving wheel (11) is mounted on the flip end of the flip member (20); after the flip end of the flip member (20) is flipped, the moving wheel (11) is completely received in the working sample rack (2).

10. A method for trial production and installation of a lower vehicle body, using a lower vehicle body matching sample frame according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Divide the parts of the lower body into a front cabin assembly, a front floor assembly and a rear floor assembly, and divide the working sample frame (2) into a front cabin sample frame (16), a front floor sample frame (17) and a rear floor sample frame (18); Step 2: Using the digital model of the body-in-white, determine the clamping points, clamping profiles, and positioning points of each working sample frame (2) according to the RPS positioning method, and then design and determine the working positions of the corresponding clamping components (6) and positioning components (7) on the working sample frame (2), so that the clamping points or positioning points of each part at various locations during installation meet the RPS positioning method, and at the same time, set a position calibration piece (8) on the working sample frame (2) to complete the digital model of the working sample frame (2); Step 3: Divide the assembly sequence of all parts into layers, and design corresponding replaceable clamping components (6) or positioning components (7) based on the assembly level of each part to avoid interference during assembly; Step 4: Manufacturing and assembling the physical working sample frame (2) according to the digital model of each working sample frame (2). During assembly, using each position calibration piece (8) as a coordinate reference, confirm the installation position of each clamping component (6) and positioning component (7). After assembly, recheck the actual installation position of each clamping component (6) and positioning component (7); Step 5: assemble the parts of each assembly using each working sample frame (2). During the assembly process, clamp and fix each part according to the clamping points and positioning points of the clamping component (6) and the positioning component (7), confirm and record the installation errors of the installation positions of each part, and directly polish and modify the parts with installation errors, and then assemble them according to the clamping points and positioning points of the clamping component (6) and the positioning component (7), and then perform assembly verification of the installation errors of the parts in each assembly level step by step; Step 6: After assembling each assembly separately, install each working sample frame (2) on the bottom platform (1) and fix it in turn, assemble each assembly together, confirm and record the installation error between the installation positions of each assembly, and then complete the overall assembly of the lower body; Step 7: Provide feedback on the recorded installation errors, optimize the dimensions or process parameters of each part, and manufacture the optimized parts; Step 8: Repeat steps 5 to 7 until the installation errors of the lower body parts are within the allowable error range, and then complete the final lower body assembly and the lower body trial assembly.

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