CN-121977476-A - Assembly detection method for preventing gap between brake pedal and accelerator pedal from being reduced

CN121977476ACN 121977476 ACN121977476 ACN 121977476ACN-121977476-A

Abstract

The invention relates to the technical field of assembly detection, in particular to an assembly detection method for preventing the gap between a brake pedal and an accelerator pedal from being reduced, which comprises the steps of firstly, respectively carrying out multi-dimensional independent detection and qualification judgment on an inner lining pipe and a lining sleeve, and endowing qualified parts with unique assembly matching codes; secondly, the central server intelligently selects candidate parts from the qualified part queue according to the assembly task, performs feature compatibility verification and dynamically binds part codes and task codes after passing; and finally, performing multiple code scanning verification at an assembly station to ensure that assembly can be performed only after the part codes and the task codes are correctly bound. The invention effectively eliminates mismatching and neglected loading of parts, fundamentally ensures the assembly quality of the pedal assembly, and eliminates the risk of mistaken stepping caused by abnormal gaps.

Inventors

HU KEMING
BAN JUN

Assignees

重庆佳速汽车零部件有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (8)

1. An assembly detection method for preventing a gap between a brake pedal and an accelerator pedal from being reduced, comprising the following steps: Respectively and independently detecting the lining pipe and the lining pipe, after judging that the lining pipe and the lining pipe are qualified, generating and marking a unique lining pipe assembly matching code for each qualified lining pipe, binding each assembly matching code with a characteristic data packet of a corresponding part, and uploading the binding to a central server; According to the received assembly task instruction, at least one candidate is selected from the stored qualified part queue for each lining pipe and lining of the required model, and feature compatibility verification is carried out on candidate part pairs; after verification is passed, the lining pipe assembly matching code and the assembly task code of the current assembly task instruction are dynamically bound to generate an assembly instruction and lock the states of the pair of parts; sequentially scanning lining pipe assembly matching codes and lining pipe assembly matching codes to be assembled at an assembly station, and executing assembly operation of a corresponding lining pipe and a lining pipe after verifying that the two scanned assembly matching codes are successfully bound with an assembly task code activated by the current station; independent detection of the liner tube includes: measuring the distance from the two end surfaces of the lining pipe to the tool reference surface respectively by using two symmetrically arranged displacement sensors through a laser triangulation ranging method, and calculating by combining a system calibration value to obtain the measured length of the lining pipe; Acquiring a contour image of the lining pipe by using a CCD industrial camera, extracting a contour by image processing, fitting a minimum circumscribed rectangle, and calculating by combining camera calibration parameters to obtain the visual diameter and the visual length of the lining pipe; The measured length and the visual diameter are respectively compared with standard values by independent tolerance, and the measured length, the visual diameter, the visual length and the appearance characteristics are matched by association rules; Independent inspection of the liner includes: Obtaining color reflection light intensity of the surface of the lining by using a color code sensor through a time-sharing spectrum method, generating a color feature vector, calculating Euclidean distance between the vector and each standard feature vector in a standard color database, and judging that the colors are primarily matched and recording suspected models if the minimum distance is smaller than a preset threshold value; Triggering a CCD auxiliary camera to shoot a lining image only after the primary matching of the colors, extracting geometric outline features and/or identification features of the lining image, and comparing the geometric outline features and/or identification features with corresponding standard features stored in a standard feature database of the suspected model; and only when the colors are primarily matched and the geometric outline features and/or the identification features in the image auxiliary verification are aligned, judging that the lining is of a qualified correct model.
2. The method for detecting assembly of a brake pedal with accelerator pedal clearance reduction prevention according to claim 1, wherein the time-sharing spectroscopy specifically comprises: And controlling the red, green and blue LED light sources in the color code sensor to be sequentially and time-divisionally lightened and irradiate the surface of the lining, synchronously measuring the reflection intensity of each color light, and normalizing the reflection intensity values of the three primary colors to generate the color characteristic vector.
3. The method for detecting assembly of a brake pedal with accelerator pedal clearance reduction prevention according to claim 1, wherein the feature compatibility check specifically includes: retrieving the critical dimension in the candidate liner tube feature data packet and the critical dimension in the candidate liner tube feature data packet; Calculating a virtual fit tolerance between the candidate liner tube and the candidate liner tube based on the critical dimension; And judging whether the virtual fit tolerance is within a preset assembly level tolerance zone.
4. The method for detecting assembly for preventing gap between a brake pedal and an accelerator pedal from decreasing as claimed in claim 3, And if the first selected candidate part fails to pass the feature compatibility check, automatically selecting the next candidate part from the queue for check until a checked part pair is found or an alarm is given.
5. The assembly inspection method for preventing gap between a brake pedal and an accelerator pedal from being reduced as set forth in claim 1, wherein at an assembly station, a liner tube assembly matching code and a liner tube assembly matching code to be assembled are scanned in sequence, and after verifying that both of the scanned assembly matching codes are successfully bound with an assembly task code activated by a current station, an assembly operation of the corresponding liner tube and liner tube is performed, comprising: Acquiring an assembly task code at an assembly station, and simultaneously acquiring an assembly instruction bound with the assembly matching code; Acquiring a lining pipe assembly matching code to be assembled, and verifying whether the lining pipe assembly matching code exists, whether the state is matched with the lining pipe to be assembled and whether the lining pipe assembly matching code is bound with an assembly task code activated by a current station; Acquiring a bushing assembly matching code to be assembled, and verifying whether the bushing assembly matching code exists, whether the state is matched with the bushing assembly to be assembled and whether the bushing assembly matching code is bound with an assembly task code activated by the current station; verifying whether the liner tube assembly matching code and the liner tube assembly matching code are bound to each other under the same assembly task code; only after each verification case has been fully verified, an indication is generated that assembly is allowed.
6. The fitting inspection method for preventing a brake pedal to accelerator pedal clearance from decreasing as set forth in claim 1, further comprising: After the assembly operation is completed, the completion state of the assembly task code is obtained, and all characteristic data packages and assembly time information associated with the liner tube assembly matching code and the liner tube assembly matching code bound with the assembly task code are archived to form a complete pedal assembly file.
7. The fitting detection method for preventing a brake pedal to accelerator pedal clearance from decreasing as set forth in claim 1, wherein the association rule matching includes: And/or judging whether the difference value between the measured length and the visual length is smaller than a preset threshold value.
8. The method for detecting assembly of a brake pedal with accelerator pedal clearance reduction prevention according to claim 1, wherein extracting the identification feature specifically includes: and carrying out character segmentation in a preset region of interest, extracting grid feature vectors of the characters, and comparing the grid feature vectors with cosine similarity of standard character grid feature vectors through calculation.

Description

Assembly detection method for preventing gap between brake pedal and accelerator pedal from being reduced Technical Field The invention relates to the technical field of assembly detection, in particular to an assembly detection method for preventing the gap between a brake pedal and an accelerator pedal from being reduced. Background The lining tube and the bushing are two key functional parts in the assembly process of the automobile brake pedal assembly. They are precisely pressed or assembled together, the quality of which directly determines the fit clearance, lateral play amplitude of the brake pedal shaft and ultimately affects the safe distance (clearance) between the brake pedal and the accelerator pedal. At present, the typical problems of the general assembly process flow in the industry still exist that for the lining pipe, the general rule or the simple gauge is only used for carrying out the spot check on the length or the diameter, the full check cannot be realized, and the relevance of the length and the diameter, the step and other external characteristics cannot be comprehensively judged, so that the wrongly assembled parts with qualified size and wrong model are difficult to find. For the bushings, the bushings are mainly inspected visually by an assembler to determine whether the bushings exist (anti-assembly) or not by using a single photoelectric sensor, but the bushings with similar colors and different models cannot be effectively distinguished, and the risk of misassembly is high. Even though the liner tube and liner are judged "acceptable" at their respective stations, there is a lack of a systematic mating and binding mechanism between them as they flow to the assembly line. The assembly worker only takes the parts by the part basket or the material rack, and the risk of carrying out assembly by taking parts of different batches and different models but similar appearance by mistake exists. This acceptable but incorrect pairing is one of the main causes of the final product (pedal assembly) to experience a fit clearance anomaly. In the existing assembly process, the brake pedal assembly is assembled wrongly due to the fact that the detection means is on one side, information is isolated and intelligent matching verification is lacked, and particularly, how to systematically prevent the gap between the brake pedal and the accelerator pedal from being reduced due to the fact that the lining pipe and the lining pipe are assembled in a wrong way, a missing way or a mismatching way. Disclosure of Invention The invention aims to provide an assembly detection method for preventing the gap between a brake pedal and an accelerator pedal from being reduced, so that mismatching and neglected assembly of parts are effectively avoided, the assembly quality of a pedal assembly is fundamentally ensured, and the risk of mistaken stepping caused by abnormal gap is eliminated. In order to achieve the above object, the present invention provides an assembly detection method for preventing a gap between a brake pedal and an accelerator pedal from being reduced, comprising the steps of: Respectively and independently detecting the lining pipe and the lining pipe, after judging that the lining pipe and the lining pipe are qualified, generating and marking a unique lining pipe assembly matching code for each qualified lining pipe, binding each assembly matching code with a characteristic data packet of a corresponding part, and uploading the binding to a central server; According to the received assembly task instruction, at least one candidate is selected from the stored qualified part queue for each lining pipe and lining of the required model, and feature compatibility verification is carried out on candidate part pairs; after verification is passed, the lining pipe assembly matching code and the assembly task code of the current assembly task instruction are dynamically bound to generate an assembly instruction and lock the states of the pair of parts; and at the assembly station, sequentially scanning an inner lining pipe assembly matching code and a lining pipe assembly matching code to be assembled, and executing assembly operation of the corresponding inner lining pipe and the lining pipe after verifying that the two scanned assembly matching codes are successfully bound with an assembly task code activated by the current station. Wherein, independently detect inside lining pipe includes: measuring the distance from the two end surfaces of the lining pipe to the tool reference surface respectively by using two symmetrically arranged displacement sensors through a laser triangulation ranging method, and calculating by combining a system calibration value to obtain the measured length of the lining pipe; Acquiring a contour image of the lining pipe by using a CCD industrial camera, extracting a contour by image processing, fitting a minimum circumscribed rectangle, and calculating by combining cam