Welding comprehensive testing fixture for automobile frame

Abstract

The invention discloses a welding comprehensive testing fixture for an automobile frame. The welding comprehensive testing fixture comprises a base, a front clamping assembly, a middle clamping assembly and a rear clamping assembly, the front clamping assembly comprises a front pressing mechanism, two front positioning mechanisms and a front detection mechanism, the front pressing mechanism drives a pressing rod part to abut against the front surface of the frame, and the front positioning mechanisms are inserted into frame positioning holes through front positioning rods to achieve two-side positioning; the middle clamping assembly comprises a middle pressing mechanism, two middle detection mechanisms and two middle positioning mechanisms, the middle pressing mechanism laterally presses the frame through pressing parts on the two sides, and the middle detection mechanisms and the positioning mechanisms correspondingly detect and are connected with holes in the middle of the frame in an inserted mode; and the rear clamping assembly comprises a rear positioning mechanism, a rear detection mechanism and a rear clamping mechanism. According to the testing fixture, a unified reference is provided through the integrated base, and all the clamping assemblies cooperate to realize accurate positioning, stable clamping and comprehensive detection of the front, middle and rear parts of the frame, so that the detection precision and efficiency are improved, the production and manufacturing cost is reduced, and the large-scale batch production requirement is met.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing equipment technology, and specifically to a comprehensive inspection fixture for welding automobile frames. Background Technology

[0002] As the core load-bearing component of a car, the structural precision of the car frame directly determines the vehicle's driving stability, safety, and the assembly precision of subsequent parts. Welding is one of the key processes in car frame production. Dimensional deviations and positioning accuracy errors in the welded frame directly affect the overall vehicle assembly quality. Therefore, it is necessary to conduct comprehensive inspections of the welded car frame using specialized inspection tools to ensure it meets design requirements.

[0003] Currently, most existing automotive frame welding inspection fixtures adopt a decentralized structural design, that is, separate positioning components and inspection components are set for different parts of the frame, and there is a lack of unified benchmark support between the components. This decentralized structure has several drawbacks: First, insufficient positioning accuracy. Because each positioning component is independently set, it's difficult to ensure consistency in positioning references for different parts of the frame (front, middle, and rear), which can easily lead to frame misalignment during testing, affecting the accuracy of the results. Second, poor clamping stability. Existing fixture clamping mechanisms are mostly unidirectional, failing to provide comprehensive and stable constraints on the frame. Slight frame movement may occur during testing, further reducing accuracy. Third, limited adaptability. Different vehicle models have different frame structures, and existing fixture positioning and testing components are mostly fixed, making it difficult to flexibly adapt to the testing needs of various models. This necessitates custom-designed fixtures for different models, increasing manufacturing costs. Fourth, low testing efficiency. The decentralized positioning and testing structure requires operators to perform positioning, clamping, and testing of different parts of the frame step-by-step, resulting in a cumbersome and time-consuming process that cannot meet the testing needs of large-scale mass production.

[0004] Furthermore, existing inspection fixtures mostly employ rigid insertion positioning mechanisms, making it difficult to control the precision of the fit between the positioning rod and the frame positioning hole. An excessively tight fit can lead to difficulty in inserting the positioning rod and easily scratch the inner wall of the positioning hole; an excessively loose fit will prevent accurate positioning. At the same time, existing inspection mechanisms have limited inspection range, making it difficult to comprehensively cover the inspection holes and geometric tolerances of key parts of the frame (front, middle, and rear), easily leading to inspection omissions and causing defective products to flow into subsequent processes.

[0005] Based on the shortcomings of the existing technologies, there is an urgent need to develop a comprehensive inspection tool for automotive frame welding that features unified benchmark support, accurate positioning, stable clamping, strong adaptability, and high inspection efficiency. This tool would solve the problems of low positioning accuracy, unstable clamping, poor adaptability, and low inspection efficiency of existing inspection tools in the process of automotive frame welding inspection, thereby ensuring the quality of automotive frame welding, reducing production costs, and meeting the needs of large-scale mass production. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a comprehensive welding inspection fixture for automobile frames, in order to solve the problems of low positioning accuracy, unstable clamping, poor adaptability and low inspection efficiency of existing automobile frame welding inspection fixtures.

[0007] The purpose of this invention is to provide a comprehensive welding inspection fixture for automobile frames, including a base and a front clamping assembly, an intermediate clamping assembly and a rear clamping assembly mounted on the base; The front clamping assembly includes a front clamping mechanism, two front positioning mechanisms, and a front detection mechanism. The front clamping mechanism includes a first square frame seat mounted on the upper front surface of the base, and a cylinder component and a pressure rod component mounted on the top side of the first square frame seat. The cylinder component is adapted to drive the pressure rod component to press against the front surface of the vehicle frame. The two front positioning mechanisms are symmetrically mounted on both sides of the first square frame seat and are adapted to press against both sides of the vehicle frame. Each front positioning mechanism includes a front positioning seat mounted on the first square frame seat and a front positioning rod mounted on the top of the front positioning seat. The front positioning rod is adapted to be inserted into a positioning hole in the vehicle frame. The intermediate clamping assembly includes an intermediate clamping mechanism, two intermediate detection mechanisms, and two intermediate positioning mechanisms mounted on the upper surface of the middle side of the base. The intermediate clamping mechanism includes a first side clamping component and a second side clamping component mounted on both sides of the base in the width direction. The first side clamping component and the second side clamping component respectively press against the side surface of the vehicle frame. One intermediate detection mechanism and the intermediate positioning mechanism are both mounted on the first side clamping component, and the other intermediate detection mechanism and the intermediate positioning mechanism are both mounted on the second side clamping component. The two intermediate detection mechanisms are respectively adapted to detect the detection holes at corresponding positions on the vehicle frame, and the two intermediate positioning mechanisms are respectively adapted to be inserted into the positioning holes at the middle position of the vehicle frame. The rear clamping assembly includes a rear positioning mechanism, a rear detection mechanism, a rear clamping mechanism, and a second square frame seat. A plurality of the rear positioning mechanisms and the rear detection mechanisms are mounted on the second square frame seat. The rear clamping mechanism is mounted between the intermediate pressing mechanism and the rear positioning mechanism. The rear positioning mechanism is adapted to be inserted into a positioning hole at the rear side of the vehicle frame. The rear detection mechanism is adapted to detect a detection hole at the corresponding rear side of the vehicle frame. The rear clamping mechanism is adapted to clamp onto the rear side wall of the vehicle frame.

[0008] Furthermore, the cylinder component includes a first cylinder and a cylinder support fixedly mounted on the top of the first square frame seat. The cylinder body of the first cylinder is hinged to the cylinder support, and the piston rod of the first cylinder is hinged to the end of the pressure rod component. The pressure rod component includes a first pressure rod and a pressure rod support fixedly connected to the first square frame base. The first pressure rod is hinged to the pressure rod support through a hinge joint. The end of the first pressure rod away from the first cylinder is provided with a pressure head, and the other end of the first pressure rod is provided with a hinge groove adapted to the piston rod of the first cylinder.

[0009] Furthermore, the pressure head is made of elastic rubber material, and the lower surface of the pressure head is provided with anti-slip texture. The pressure head is detachably connected to the first pressure rod.

[0010] Furthermore, a front limiting sleeve is fitted at the end of the front positioning rod, and the middle part of the front positioning rod is fixedly connected to the front positioning seat through the front limiting seat.

[0011] Furthermore, the front detection mechanism includes a front detection seat fixedly connected to the first square frame seat, a side detection pin structure horizontally installed on the side of the front detection seat, and a top detection pin structure horizontally installed on the top of the front detection seat. The side detection pin structure and the top detection pin structure are respectively provided corresponding to the side detection hole and the top detection hole on the front side of the vehicle frame.

[0012] Furthermore, the first side pressing component includes a first square seat fixedly connected to one side of the base, a first telescopic cylinder mounted on the first square seat, a first telescopic sleeve, and a second pressure rod. The second pressure rod is connected to the output end of the first telescopic cylinder, and the end of the second pressure rod is fixedly connected to the first telescopic sleeve. The second side pressing component includes a second square seat fixedly connected to the other side of the base, a second telescopic cylinder mounted on the second square seat, a second telescopic sleeve, and a third pressure rod. The third pressure rod is connected to the output end of the second telescopic cylinder, and the end of the third pressure rod is fixedly connected to the second telescopic sleeve.

[0013] Furthermore, the intermediate detection mechanism includes a first detection pin and a first detection pin sleeve. The first detection pin is fixedly connected to the first square base through the first detection pin sleeve, and the first detection pin slides through the first detection pin sleeve. The intermediate positioning mechanism includes a first positioning base, a first vertical connecting plate, a first horizontal connecting plate, and a second positioning rod, which are fixedly connected to the first side pressing component or the second side pressing component. The first vertical connecting plate is vertically installed on the first positioning base, the first horizontal connecting plate is perpendicularly connected to the first vertical connecting plate, and the second positioning rod is installed on the first horizontal connecting plate. The end of the second positioning rod is fitted with a second limiting sleeve, and the second positioning rod is connected to the first horizontal connecting plate through the second limiting seat.

[0014] Furthermore, the rear positioning mechanism includes a rear positioning base fixedly connected to the second square frame base, a first angle adjustment plate connected to the rear positioning base, and a third positioning rod installed on the first angle adjustment plate. The end of the third positioning rod is fitted with a third limiting sleeve, and the third positioning rod is fixedly connected to the first angle adjustment plate through a third limiting seat. The rear inspection mechanism includes a rear inspection base fixedly connected to the second square frame base, a second inspection pin and a second inspection pin sleeve installed on the rear inspection base, the second inspection pin slidingly passing through the second inspection pin sleeve, and the second inspection pin being fixedly connected to the rear inspection base through the second inspection pin sleeve.

[0015] Furthermore, the rear clamping mechanism includes a first clamping seat and a second clamping seat, which are symmetrically installed on both sides of the base in the width direction. The first clamping seat includes a first clamping post and a first clamping frame, and the first clamping frame is hinged to the first clamping post. The second clamping seat includes a second clamping post and a second clamping frame, and the second clamping frame is hinged to the second clamping post.

[0016] Furthermore, each of the four corners of the base is provided with a caster wheel, which is a silent caster wheel with a locking function, and a rubber buffer pad is provided between the caster wheel and the base.

[0017] Compared with the prior art, the present invention has significant advantages and beneficial effects, specifically reflected in the following aspects: 1. By integrating the front clamping assembly, intermediate clamping assembly and rear clamping assembly into a base, the synchronous positioning, clamping and inspection of key parts of the front, middle and rear of the vehicle frame are realized. This effectively avoids the cumulative error caused by multiple positioning by traditional distributed inspection fixtures, significantly improves the dimensional inspection accuracy after the frame is welded, and ensures the consistency of the overall assembly accuracy of the frame.

[0018] 2. In the front clamping assembly, the first square frame seat provides a stable mounting reference for the cylinder component, the pressure rod component, and the front positioning mechanisms on both sides. The design of the cylinder driving the pressure rod component to press against the front surface of the frame can achieve fast and reliable axial clamping, ensuring that the front of the frame does not shift during the inspection process. The symmetrically arranged front positioning mechanisms on both sides connect to the frame positioning holes through the front positioning rods, and together with the axial clamping, they can achieve precise positioning of the front of the frame. At the same time, the dual-side positioning structure can effectively limit the lateral displacement of the front of the frame, further improving the positioning stability.

[0019] 3. The intermediate clamping assembly uses first and second side clamping components symmetrically arranged on both sides of the base width to achieve double-sided lateral clamping of the middle of the frame. Compared with single-sided clamping, it can apply clamping force more evenly, avoid deformation of the middle of the frame due to unilateral force, and ensure the morphological stability of the middle of the frame during the inspection process. At the same time, the intermediate inspection mechanism and the intermediate positioning mechanism are integrated on the side clamping components on both sides, so that the positioning and inspection points are accurately aligned. The insertion positioning of the positioning hole in the middle of the frame and the accuracy inspection of the inspection hole can be completed simultaneously, simplifying the inspection process and improving inspection efficiency.

[0020] 4. The rear clamping assembly integrates several rear positioning and rear inspection mechanisms through the second square frame seat, realizing synchronous positioning and inspection of multiple points on the rear side of the frame, adapting to the complex positioning and inspection requirements of the rear side of the frame; the rear clamping mechanism is installed between the intermediate clamping mechanism and the rear positioning mechanism, which can form a precise clamp on the rear side wall of the frame, and together with the insertion positioning of the rear positioning mechanism, realizes the axial and lateral dual limit of the rear side of the frame, ensuring the overall stability of the frame during the inspection process; the collaborative design of multiple sets of rear positioning and rear inspection mechanisms can comprehensively cover the key inspection points on the rear side of the frame, improving the comprehensiveness and reliability of the dimensional accuracy inspection of the rear side of the frame.

[0021] 5. All positioning mechanisms of the overall inspection fixture adopt a positioning method in which positioning rods are inserted into the positioning holes of the frame. Combined with the precise force application of each clamping / pressing mechanism, an integrated working mode of "positioning, clamping, and inspection" is formed. This not only significantly shortens the inspection cycle of a single frame and improves inspection efficiency, but also reduces the difficulty of manual operation, making it easy for front-line inspection personnel to get started quickly. At the same time, the modular design of each assembly facilitates subsequent targeted adjustments or replacement of corresponding parts according to the size requirements of different vehicle frame models, improving the versatility and adaptability of the inspection fixture and reducing the cost of inspection fixture investment in multi-vehicle production scenarios. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the comprehensive welding inspection fixture for automobile frames in an embodiment of the present invention; Figure 2This is a schematic diagram of the main view structure of the comprehensive welding inspection fixture for automobile frames in an embodiment of the present invention; Figure 3 This is a top view of the integrated welding inspection fixture for automobile frames in an embodiment of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the front clamping assembly in an embodiment of the present invention; Figure 5 This is a schematic diagram of the front clamping assembly in an embodiment of the present invention; Figure 6 This is an exploded structural diagram of the front clamping assembly in an embodiment of the present invention; Figure 7 This is a three-dimensional structural schematic diagram of the pre-detection mechanism in an embodiment of the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the intermediate clamping assembly in an embodiment of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of the rear clamping assembly in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures 1-Base; 11-Wheel casters; 2-Front clamping assembly; 21-Front clamping mechanism; 211 - First square frame base; 212-Cylinder assembly; 2121-First cylinder; 2122-Cylinder support; 213-Pressure bar component; 2131-First pressure bar; 21311-Pressure bar body; 213111-Hinge groove; 21312-Pressure head; 21313-Hinge joint; 2132-Pressure bar support; 22-Front positioning mechanism; 221-Front positioning seat; 222-Front positioning rod; 2221-Front limit seat; 2222-Front limit sleeve; 23-Front inspection mechanism; 231-Front inspection seat; 232-Side inspection pin structure; 233-Top inspection pin structure; 3-Intermediate clamping assembly; 31 - Intermediate clamping mechanism; 311-First side clamping component; 3111-First square seat; 3112-First telescopic cylinder; 3113-First telescopic sleeve; 3114-Second pressure rod; 312-Second side clamping component; 3121-Second square seat; 3122-Second telescopic cylinder; 3123-Second telescopic sleeve; 3124-Third pressure rod; 32 - Intermediate testing unit; 321 - First testing pin; 322 - First testing pin sleeve; 33-Intermediate positioning mechanism; 331-First positioning base; 332-First vertical connecting plate; 333-First horizontal connecting plate; 334-Second positioning rod; 3341-Second limiting seat; 3342-Second limiting sleeve; 4- Rear clamping assembly; 41-Rear positioning mechanism; 411-Rear positioning base; 412-First angle adjustment plate; 413-Third positioning rod; 4131-Third limit seat; 4132-Third limit sleeve; 42-Rear inspection mechanism; 421-Rear inspection base; 422-Second inspection pin; 423-Second inspection pin sleeve.

[0024] 43 - Rear clamping mechanism; 431-First clamping seat; 4311-First clamping post; 4312-First clamping frame; 432-Second clamping seat; 4321-Second clamping post; 4322-Second clamping frame; 44 - Second square frame base. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0029] The following is combined Figures 1-9 This invention describes a comprehensive welding fixture for an automobile frame, comprising a base 1, a front clamping assembly 2, an intermediate clamping assembly 3, and a rear clamping assembly 4, wherein: The front clamping assembly 2, the intermediate clamping assembly 3, and the rear clamping assembly 4 are all mounted on the base 1. In a preferred embodiment, the front clamping assembly 2 includes a front clamping mechanism 21, two front positioning mechanisms 22, and a front detection mechanism 23. The front clamping mechanism 21 includes a first square frame seat 211, a cylinder component 212, and a pressure rod component 213. The first square frame seat 211 is mounted on the front upper surface of the base 1, while the cylinder component 212 and the pressure rod component 213 are both mounted on top of the first square frame seat 211. On the side, the cylinder component 212 is adapted to drive the pressure rod component 213 to press against the front surface of the vehicle frame; two front positioning mechanisms 22 are symmetrically installed on both sides of the first square frame seat 211 and adapted to press against both sides of each vehicle frame. Each front positioning mechanism 22 includes a front positioning seat 221 and a front positioning rod 222. The front positioning seat 221 is installed on the first square frame seat 211, and the front positioning rod 222 is installed on the top of the front positioning seat 221. The front positioning rod 222 is adapted to be inserted into the positioning hole of the vehicle frame. The intermediate clamping assembly 3 includes an intermediate clamping mechanism 31, two intermediate detection mechanisms 32, and two intermediate positioning mechanisms 33. The intermediate clamping mechanism 31, the two intermediate detection mechanisms 32, and the two intermediate positioning mechanisms 33 are all installed on the upper surface of the middle side of the base 1. The intermediate clamping mechanism 31 includes a first side clamping component 311 and a second side clamping component 312 installed on both sides of the base 1 in the width direction. The first side clamping component 311 and the second side clamping component 312 are respectively pressed against the side surface of the vehicle frame. One intermediate detection mechanism 32 and the intermediate positioning mechanism 33 are both installed on the first side clamping component 311, and the other intermediate detection mechanism 32 and the intermediate positioning mechanism 33 are both installed on the second side clamping component 312. The two intermediate detection mechanisms 32 are respectively adapted to detect the detection holes at corresponding positions of the vehicle frame, and the two intermediate positioning mechanisms 33 are respectively adapted to be inserted into the positioning holes at the middle position of the vehicle frame. The rear clamping assembly 4 includes a rear positioning mechanism 41, a rear detection mechanism 42, a rear clamping mechanism 43, and a second square frame seat 44. Several rear positioning mechanisms 41 and rear detection mechanisms 42 are mounted on the second square frame seat 44. The rear clamping mechanism 43 is mounted between the intermediate pressing mechanism 31 and the rear positioning mechanism 41. The rear positioning mechanism 41 is adapted to be inserted into a positioning hole at the rear side of the vehicle frame. The rear detection mechanism 42 is adapted to detect the detection hole at the corresponding rear side of the vehicle frame. The rear clamping mechanism 43 is adapted to be clamped onto the rear side wall of the vehicle frame.

[0030] In this specific embodiment, after the vehicle frame to be tested is placed on the base 1, the front end is first positioned and fixed by the front clamp assembly 2. Two front positioning mechanisms 22 are symmetrically distributed on both sides of the first square frame seat 211. Their front positioning rods are directly inserted into the positioning holes at the front end of the vehicle frame, and the front end of the frame is accurately positioned by means of hole-shaft cooperation, which restricts the horizontal displacement and deflection freedom of the front end of the frame. Subsequently, the cylinder component 212 installed on the top side of the first square frame seat 211 drives the pressure rod component 213 to move downward and press against the front surface of the vehicle frame, further restricting the vertical freedom of the front end of the frame and completing the clamping and fixing of the front end. Finally, the front inspection mechanism 23 inspects the dimensions or geometric tolerances of the corresponding position of the front end of the frame to ensure the basic accuracy after the front end is welded.

[0031] Based on the front-end constraint completed by the front clamping assembly 2, the intermediate clamping assembly 3 performs dual-sided synchronous constraint and inspection on the middle of the frame. The first-side clamping component 311 and the second-side clamping component 312 of the intermediate clamping mechanism 31 apply force from both sides of the base 1 towards the middle of the frame, pressing against the side surface of the frame to restrict the horizontal lateral freedom of the middle of the frame and prevent deformation caused by the large span of the frame in the middle. At the same time, the intermediate positioning mechanism 33, which is installed on the clamping components on both sides, has its positioning component inserted into the positioning hole in the middle of the frame to further enhance the positioning accuracy of the middle and ensure the uniformity of the assembly datum in the middle of the frame. In addition, the intermediate inspection mechanism 32, which is arranged on the same side as the intermediate positioning mechanism 33, directly inspects the inspection hole in the middle of the frame, realizing the synchronous operation of positioning and inspection and improving the continuity of the process.

[0032] After the front end of the frame is fixed, the rear clamping assembly 4 performs the final constraint and inspection of the rear end. Several rear positioning mechanisms 41 are installed on the second square frame seat 44, and their positioning components are inserted into the positioning holes on the rear side of the frame to achieve precise positioning of the rear end of the frame. Together with the front positioning mechanism 22 and the intermediate positioning mechanism 33, they form a "three-point alignment" positioning system to ensure the straightness and position of the entire frame. The rear clamping mechanism 43 is installed between the intermediate clamping mechanism 31 and the rear positioning mechanism 41, clamping it on the rear side wall of the frame to further restrict the displacement freedom of the rear end of the frame and prevent warping or offset of the rear end of the frame during the inspection process. Finally, the rear inspection mechanism 42 inspects the inspection holes at the corresponding positions on the rear side of the frame to complete the inspection coverage of the entire length of the frame.

[0033] Thus, by arranging the front, middle and rear clamping assemblies sequentially along the length of the base 1, a segmented constraint on the vehicle frame is formed. The positioning process follows the principle of starting from both ends and then moving to the middle, while the clamping process is carried out synchronously with the positioning sequence. The inspection process is integrated with the positioning and clamping processes into the same assembly, realizing integrated operation of positioning, clamping and inspection, and avoiding the loss of accuracy caused by step-by-step operation.

[0034] Traditional automotive frame welding and inspection typically requires three separate processes: positioning, clamping, and inspection, with time-consuming transitions between these processes. This invention integrates the positioning, clamping, and inspection mechanisms into three clamping assemblies: front, middle, and rear. Simultaneously, frame positioning and clamping are performed, allowing for inspection of the corresponding positions without requiring additional adjustments to the frame position or changes in inspection tools. This enables a single clamping operation for comprehensive inspection, significantly reducing inspection time and improving overall inspection efficiency.

[0035] Specifically, please refer to Figure 4 , 5 As shown in Figures 6 and 7, in one embodiment of the present invention, the cylinder component 212 includes a first cylinder 2121 and a cylinder support 2122, wherein: The cylinder support 2122 is fixedly installed on the top of the first square frame seat 211. The cylinder body of the first cylinder 2121 is hinged to the cylinder support 2122, and the piston rod of the first cylinder 2121 is hinged to the end of the pressure rod component 213. The pressure rod component 213 includes a first pressure rod 2131 and a pressure rod support 2132. The pressure rod support 2132 is fixedly connected to the first square frame base 211. The first pressure rod 2131 is hinged to the pressure rod support 2132 through a hinge joint 21313. The end of the first pressure rod 2131 away from the first cylinder 2121 is provided with a pressure head 21312. The other end of the first pressure rod 2131 is provided with a hinge groove 213111 that is adapted to the piston rod of the first cylinder 2121.

[0036] Specifically, the first pressure rod 2131 consists of a pressure rod body 21311, a pressure head 21312, and a hinge joint 21313. The first pressure rod 2131 forms a force-saving lever structure with the hinge joint 21313 as the fulcrum. The piston rod thrust of the first cylinder 2121 can be converted into a larger clamping force acting on the pressure head 21312 through the lever principle. Compared with the direct drive clamping method, this design can increase the clamping force on the frame without increasing the cylinder size, ensuring that the frame will not be displaced due to vibration or external force interference during the inspection process. At the same time, the transmission path of the lever structure is clear, the force transmission efficiency is high, and the output of the clamping force is more stable, avoiding inspection errors caused by clamping force fluctuations.

[0037] The cylinder body of the first cylinder 2121 is hinged to the cylinder support 2122, the piston rod is hinged to the first pressure rod 2131, and the first pressure rod 2131 is hinged to the pressure rod support 2132, forming a three-point hinged linkage structure. This structure can compensate for the trajectory deviation between the linear motion of the cylinder piston rod and the arc motion of the pressure head, making the motion trajectory of the pressure head 21312 more closely conform to the contour of the front surface of the frame; at the same time, the hinged connection allows each component to make a certain angle adjustment during the movement, avoiding component jamming or stress concentration caused by rigid connection, and improving the operational flexibility and service life of the clamping mechanism.

[0038] The cylinder component 212 is fixed to the first square frame seat 211 via the cylinder support 2122, and the pressure rod component 213 is fixed via the pressure rod support 2132. The components are assembled in a modular manner. To accommodate the differences in the front profile dimensions of different car frame models, only the shape and size of the pressure head 21312 need to be replaced or adjusted, or the installation positions of the cylinder support 2122 and the pressure rod support 2132 need to be adjusted, to adapt to the clamping requirements of different frames without redesigning the entire clamping mechanism. Furthermore, the modular structure facilitates the disassembly and replacement of components; when a component malfunctions, it can be repaired or replaced individually, reducing the maintenance cost of the inspection tool.

[0039] Specifically, in one embodiment of the present invention, the pressure head 21312 is made of elastic rubber material, the lower surface of the pressure head 21312 is provided with anti-slip texture, and the pressure head 21312 is detachably connected to the first pressure rod 2131.

[0040] Compared to rigid indenters made of metal, the elastic rubber indenter undergoes elastic deformation upon contact with the chassis, avoiding damage such as indentations and scratches caused by rigid contact to the welded surfaces of the chassis. This is particularly suitable for chassis welding inspection scenarios requiring surface painting or high precision. The anti-slip texture on the lower surface of the 21312 indenter increases the coefficient of friction of the contact surface, transforming the traditional rigid clamping and limiting into a dual constraint of flexible clamping and friction limiting. During the inspection process, even under slight external disturbances or forces from the inspection mechanism, the anti-slip texture effectively prevents relative sliding between the chassis and the indenter, ensuring that the front end of the chassis remains in a precise positioning state and avoiding data distortion caused by slippage.

[0041] Specifically, please refer to Figure 6 As shown, in one embodiment of the present invention, the end of the front positioning rod 222 is fitted with a front limiting sleeve 2222, and the middle part of the front positioning rod 222 is fixedly connected to the front positioning seat 221 through the front limiting seat 2221.

[0042] Thus, the front positioning rod limiting structure and the elastic pressure head of the front clamping mechanism 21 work together: the front positioning mechanism 22 achieves precise positioning of the front end of the frame through double limiting, and the front clamping mechanism 21 restricts the vertical degree of freedom of the frame through elastic clamping. Together, they constrain the six degrees of freedom of the front end of the frame, ensuring that the frame is always in a stable reference position during the testing process, providing an accurate testing basis for the front testing mechanism.

[0043] Specifically, please refer to Figure 3 , 7 As shown, in one embodiment of the present invention, the front detection mechanism 23 includes a front detection seat 231, a side detection pin structure 232, and a component horizontally mounted on the front detection seat 231, wherein: The front detection seat 231 is fixedly connected to the first square frame seat 211. The side detection pin structure 232 is horizontally installed on the side of the front detection seat 231, and the top detection pin structure 233 is horizontally installed on the top of the front detection seat 231. The side detection pin structure 232 and the top detection pin structure 233 are respectively set to the side detection hole and the top detection hole on the front side of the vehicle frame.

[0044] Specifically, the front inspection mechanism 23 is rigidly connected to the first square frame seat 211 through the front inspection seat 231, so that the installation reference of the inspection mechanism is consistent with the assembly reference of the front positioning mechanism and the front clamping mechanism 21, avoiding inspection errors caused by inconsistent references; at the same time, the installation positions of the side inspection pin structure 232 and the top inspection pin structure 233 are strictly matched with the design positions of the frame inspection holes, ensuring the coaxiality of the inspection pins and inspection holes, greatly improving the inspection accuracy of parameters such as the position and diameter of the inspection holes, and ensuring that the inspection results can truly reflect the welding status of the front end of the frame.

[0045] Specifically, please refer to Figure 8 As shown, in one embodiment of the present invention, the first side pressing member 311 includes a first square seat 3111, a first telescopic cylinder 3112, a first telescopic sleeve 3113, and a second pressing rod 3114, wherein: The first square seat 3111 is fixedly connected to one side of the base 1, the first telescopic cylinder 3112 is installed on the first square seat 3111, the second pressure rod 3114 is connected to the output end of the first telescopic cylinder 3112, and the end of the second pressure rod 3114 is fixedly connected to the first telescopic sleeve 3113. Preferably, the second side pressing component 312 includes a second square seat 3121, a second telescopic cylinder 3122, a second telescopic sleeve 3123, and a third pressing rod 3124. The second square seat 3121 is fixedly connected to the other side of the base 1. The second telescopic cylinder 3122 is mounted on the second square seat 3121. The third pressing rod 3124 is connected to the output end of the second telescopic cylinder 3122. The end of the third pressing rod 3124 is fixedly connected to the second telescopic sleeve 3123.

[0046] Specifically, in this embodiment, the clamping components on both sides are symmetrically arranged with the center line of the base 1 as the axis of symmetry, and the cylinders drive synchronously, so that the clamping force is applied symmetrically from both sides of the middle of the frame, avoiding bending or displacement deformation of the middle of the frame caused by clamping on one side; the symmetrical clamping force can completely restrict the horizontal lateral freedom of the middle of the frame, ensuring the accurate relative position of the middle of the frame and the base, providing a stable attitude reference for the positioning rod insertion detection hole of the intermediate positioning mechanism 33 and the accurate detection of the intermediate detection mechanism 32, and greatly improving the accuracy of welding precision detection of the middle of the frame.

[0047] Specifically, please refer to Figure 8 As shown, in one embodiment of the present invention, the intermediate detection mechanism 32 includes a first detection pin 321 and a first detection pin sleeve 322. The first detection pin 321 is fixedly connected to the first square seat 3111 through the first detection pin sleeve 322, and the first detection pin 321 slides through the first detection pin sleeve 322. The intermediate positioning mechanism 33 includes a first positioning base 331, a first vertical connecting plate 332, a first horizontal connecting plate 333, and a second positioning rod 334. The first positioning base 331 is fixedly connected to the first side clamping component 311 or the second side clamping component 312. The first vertical connecting plate 332 is vertically installed on the first positioning base 331. The first horizontal connecting plate 333 is vertically connected to the first vertical connecting plate 332. The second positioning rod 334 is installed on the first horizontal connecting plate 333. The end of the second positioning rod 334 is fitted with a second limiting sleeve 3342, and the second positioning rod 334 is connected to the first horizontal connecting plate 333 through the second limiting seat 3341.

[0048] Therefore, by integrating the intermediate detection mechanism 32 and the intermediate positioning mechanism 33 into the side clamping component and sharing the same installation reference with the side clamping component, the cumulative error caused by the separation of multiple mechanism references is avoided, ensuring that the positions of the positioning rod and the detection pin are highly consistent with the design position of the frame; the second limit seat 3341 fixes the middle part of the second positioning rod 334, restricting the radial movement and bending deformation of the positioning rod and ensuring the posture accuracy of the positioning rod; the guiding and gap compensation function of the second limit sleeve 3342 enables the positioning rod to be accurately inserted into the positioning hole of the frame, while avoiding wear caused by rigid contact and improving the consistency of the positioning in the middle of the frame.

[0049] Specifically, please refer to Figure 3 , 9 As shown, in one embodiment of the present invention, the rear positioning mechanism 41 includes a rear positioning base 411, a first angle adjustment plate 412, and a third positioning rod 413, wherein: The rear positioning base 411 is fixedly connected to the second square frame base 44, the first angle adjustment plate 412 is connected to the rear positioning base 411, the third positioning rod 413 is installed on the first angle adjustment plate 412, the end of the third positioning rod 413 is fitted with a third limiting sleeve 4132, and the third positioning rod 413 is fixedly connected to the first angle adjustment plate 412 through the third limiting seat 4131. The rear inspection mechanism 42 includes a rear inspection base 421, a second inspection pin 422, and a second inspection pin sleeve 423. The rear inspection base 421 is fixedly connected to the second square frame base 44. The second inspection pin 422 is installed on the rear inspection base 421 and slides through the second inspection pin sleeve 423. The second inspection pin 422 is fixedly connected to the rear inspection base 421 through the second inspection pin sleeve 423.

[0050] In this embodiment, the rear positioning mechanism 41 is equipped with a first angle adjustment plate 412. By adjusting its installation angle, the angle of the third positioning rod 413 can be finely adjusted, which can adapt to the angle differences of the positioning holes on the rear side of the frame of different vehicle models, or the welding angle deviation of the frame of different batches of the same vehicle model. This solves the problem that traditional fixed-angle positioning rods cannot be compatible with multiple vehicle models or frames with angle deviations. At the same time, the third limiting sleeve 4132 at the end of the third positioning rod 413 can compensate for the assembly gap between the positioning rod and the positioning hole, avoiding positioning deviation or component wear caused by rigid contact, and further improving the accuracy and consistency of positioning. Compared with positioning mechanisms without angle adjustment function, this design greatly expands the applicability of the inspection fixture and reduces the development cost of inspection fixtures for multi-vehicle model inspection.

[0051] Specifically, please refer to Figure 9As shown, in one embodiment of the present invention, the rear clamping mechanism 43 includes a first clamping seat 431 and a second clamping seat 432. The first clamping seat 431 and the second clamping seat 432 are symmetrically installed on both sides of the base 1 in the width direction. The first clamping seat 431 includes a first clamping post 4311 and a first clamping frame 4312, and the first clamping frame 4312 is hinged to the first clamping post 4311. The second clamping seat 432 includes a second clamping post 4321 and a second clamping frame 4322, and the second clamping frame 4322 is hinged to the second clamping post 4321.

[0052] In this embodiment, the first clamping seat 431 and the second clamping seat 432 are symmetrically installed on both sides of the base 1 with the center line in the width direction of the base 1 as the axis of symmetry, and are arranged at a key position between the intermediate clamping mechanism 31 and the rear positioning mechanism 41, forming a double-sided clamping of the rear side of the vehicle frame. Each clamping seat is composed of a clamping column and a clamping frame forming a hinged structure: the first clamping frame 4312 is hinged to the first clamping column 4311, and the second clamping frame 4322 is hinged to the second clamping column 4321. The hinged connection allows the clamping frame to have the freedom to rotate around the clamping column. In the initial state, the clamping frame is in an outwardly rotated open state, and its clamping end maintains a sufficient distance from the center line of the base, reserving sufficient operating space for the vehicle frame to be transferred to the rear workstation through the front and middle clamping assemblies, and avoiding interference with the clamping mechanism during the transfer of the vehicle frame.

[0053] After the front and middle sections of the vehicle frame are positioned and clamped, and the third positioning rod 413 of the rear positioning mechanism 41 is inserted into the positioning hole on the rear side of the frame for precise positioning, the operator or the automated drive device drives the first clamping frame 4312 and the second clamping frame 4322 to rotate inward simultaneously. The clamping ends of the clamping frames gradually approach and adhere to the side wall surface of the rear side of the frame. As the rotation continues, the clamping frames apply a stable clamping force to the side wall of the frame. The symmetrical clamping forces of the two clamping frames cancel each other out in the horizontal direction, leaving only the clamping constraint effect on the frame. This restricts the horizontal lateral displacement and the degree of freedom of deflection around the longitudinal axis of the rear side of the frame, making the rear side of the frame and the rear positioning mechanism form a rigid constraint whole.

[0054] Throughout the entire process of the rear inspection mechanism 42 performing precision inspection on the rear inspection holes of the frame, the rear clamping mechanism 43 maintains a clamping state, continuously providing a stable clamping force. This clamping force works synergistically with the positioning constraints of the rear positioning mechanism 41 and the constraints of the front and intermediate clamping assemblies to achieve multi-directional and multi-node constraints on the entire length of the frame, ensuring that the frame will not shift position or deform during the inspection process due to its own weight, the force of the inspection pin insertion, or external vibrations.

[0055] After the rear side of the frame is inspected, the first clamping bracket 4312 and the second clamping bracket 4322 are driven to flip outward to their initial open state, releasing the clamping constraints on the rear side of the frame. At this time, the frame can be smoothly removed from the base or transferred to subsequent processes, completing a complete frame welding and inspection cycle.

[0056] Specifically, please refer to Figure 1 , 2 As shown, in one embodiment of the present invention, the base 1 is provided with casters 11 at the four corners of the bottom. The casters 11 are silent casters with locking function, and a rubber buffer pad is provided between the casters 11 and the base 1.

[0057] Compared to traditional fixed-installation inspection fixtures, the omnidirectional wheels with locking function free the inspection fixtures from the limitations of fixed workstations. Operators can flexibly adjust the position of the inspection fixtures according to the production plan, adapting to the production needs of mixed-line inspection of multiple vehicle models. No additional lifting equipment is required to assist in movement, reducing the time and labor costs of workstation adjustment.

[0058] The present invention has been disclosed above, but the scope of protection disclosed herein is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this invention.

Claims

1. A comprehensive inspection fixture for welding automobile frames, characterized in that, Includes a base and a front clamping assembly, a middle clamping assembly and a rear clamping assembly mounted on the base; The front clamping assembly includes a front clamping mechanism, two front positioning mechanisms, and a front detection mechanism. The front clamping mechanism includes a first square frame seat mounted on the upper front surface of the base, and a cylinder component and a pressure rod component mounted on the top side of the first square frame seat. The cylinder component is adapted to drive the pressure rod component to press against the front surface of the vehicle frame. The two front positioning mechanisms are symmetrically mounted on both sides of the first square frame seat and are adapted to press against both sides of the vehicle frame. Each front positioning mechanism includes a front positioning seat mounted on the first square frame seat and a front positioning rod mounted on the top of the front positioning seat. The front positioning rod is adapted to be inserted into a positioning hole in the vehicle frame. The intermediate clamping assembly includes an intermediate clamping mechanism, two intermediate detection mechanisms, and two intermediate positioning mechanisms mounted on the upper surface of the middle side of the base. The intermediate clamping mechanism includes a first side clamping component and a second side clamping component mounted on both sides of the base in the width direction. The first side clamping component and the second side clamping component respectively press against the side surface of the vehicle frame. One intermediate detection mechanism and the intermediate positioning mechanism are both mounted on the first side clamping component, and the other intermediate detection mechanism and the intermediate positioning mechanism are both mounted on the second side clamping component. The two intermediate detection mechanisms are respectively adapted to detect the detection holes at corresponding positions on the vehicle frame, and the two intermediate positioning mechanisms are respectively adapted to be inserted into the positioning holes at the middle position of the vehicle frame. The rear clamping assembly includes a rear positioning mechanism, a rear detection mechanism, a rear clamping mechanism, and a second square frame seat. A plurality of the rear positioning mechanisms and the rear detection mechanisms are mounted on the second square frame seat. The rear clamping mechanism is mounted between the intermediate pressing mechanism and the rear positioning mechanism. The rear positioning mechanism is adapted to be inserted into a positioning hole at the rear side of the vehicle frame. The rear detection mechanism is adapted to detect a detection hole at the corresponding rear side of the vehicle frame. The rear clamping mechanism is adapted to clamp onto the rear side wall of the vehicle frame.

2. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that, The cylinder component includes a first cylinder and a cylinder support fixedly mounted on the top of the first square frame seat. The cylinder body of the first cylinder is hinged to the cylinder support, and the piston rod of the first cylinder is hinged to the end of the pressure rod component. The pressure rod component includes a first pressure rod and a pressure rod support fixedly connected to the first square frame base. The first pressure rod is hinged to the pressure rod support through a hinge joint. The end of the first pressure rod away from the first cylinder is provided with a pressure head, and the other end of the first pressure rod is provided with a hinge groove adapted to the piston rod of the first cylinder.

3. The comprehensive welding inspection fixture for automobile frames according to claim 2, characterized in that: The pressure head is made of elastic rubber material, and the lower surface of the pressure head is provided with anti-slip texture. The pressure head is detachably connected to the first pressure rod.

4. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that, The end of the front positioning rod is fitted with a front limiting sleeve, and the middle part of the front positioning rod is fixedly connected to the front positioning seat through the front limiting seat.

5. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that: The front detection mechanism includes a front detection seat fixedly connected to the first square frame seat, a side detection pin structure horizontally installed on the side of the front detection seat, and a top detection pin structure horizontally installed on the top of the front detection seat. The side detection pin structure and the top detection pin structure are respectively provided corresponding to the side detection hole and the top detection hole on the front side of the vehicle frame.

6. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that: The first side clamping component includes a first square seat fixedly connected to one side of the base, a first telescopic cylinder mounted on the first square seat, a first telescopic sleeve, and a second pressure rod. The second pressure rod is connected to the output end of the first telescopic cylinder, and the end of the second pressure rod is fixedly connected to the first telescopic sleeve. The second side clamping component includes a second square seat fixedly connected to the other side of the base, a second telescopic cylinder mounted on the second square seat, a second telescopic sleeve, and a third pressure rod. The third pressure rod is connected to the output end of the second telescopic cylinder, and the end of the third pressure rod is fixedly connected to the second telescopic sleeve.

7. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that: The intermediate testing mechanism includes a first testing pin and a first testing pin sleeve. The first testing pin is fixedly connected to the first square base through the first testing pin sleeve, and the first testing pin slides through the first testing pin sleeve. The intermediate positioning mechanism includes a first positioning base, a first vertical connecting plate, a first horizontal connecting plate, and a second positioning rod, which are fixedly connected to the first side pressing component or the second side pressing component. The first vertical connecting plate is vertically installed on the first positioning base, the first horizontal connecting plate is perpendicularly connected to the first vertical connecting plate, and the second positioning rod is installed on the first horizontal connecting plate. The end of the second positioning rod is fitted with a second limiting sleeve, and the second positioning rod is connected to the first horizontal connecting plate through the second limiting seat.

8. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that, The rear positioning mechanism includes a rear positioning base fixedly connected to the second square frame base, a first angle adjustment plate connected to the rear positioning base, and a third positioning rod installed on the first angle adjustment plate. The end of the third positioning rod is fitted with a third limiting sleeve, and the third positioning rod is fixedly connected to the first angle adjustment plate through a third limiting seat. The rear inspection mechanism includes a rear inspection base fixedly connected to the second square frame base, a second inspection pin and a second inspection pin sleeve installed on the rear inspection base, the second inspection pin slidingly passing through the second inspection pin sleeve, and the second inspection pin being fixedly connected to the rear inspection base through the second inspection pin sleeve.

9. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that, The rear clamping mechanism includes a first clamping seat and a second clamping seat, which are symmetrically installed on both sides of the base in the width direction. The first clamping seat includes a first clamping column and a first clamping frame, and the first clamping frame is hinged to the first clamping column. The second clamping seat includes a second clamping column and a second clamping frame, and the second clamping frame is hinged to the second clamping column.

10. The comprehensive welding inspection fixture for automobile frames according to claim 1, characterized in that, The base is equipped with casters at all four corners of its bottom. These casters are silent casters with locking function, and rubber cushioning pads are provided between the casters and the base.

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