A kind of automobile B post reinforcement stopper nut detection tooling
By incorporating limiting structures and non-magnetic materials into the testing fixture, the problem of uncontrolled probe rotation under electromagnetic interference was solved, achieving high-precision, stable, and versatile testing, thereby improving production efficiency and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING BOJUN IND TECH CO LTD
- Filing Date
- 2025-09-03
- Publication Date
- 2026-07-07
AI Technical Summary
Existing automotive B-pillar reinforcement limiter nut testing equipment suffers from uncontrolled probe rotation under electromagnetic interference, leading to trajectory interference, incomplete welding, or machine collisions. Furthermore, it is difficult to adapt to the flexibility requirements of multi-variety, small-batch production.
A detection fixture including a fixed base, a spring pin, a telescopic cylinder, a sensor, and a limiting structure was designed. The rotation angle of the spring pin is limited by symmetrical blocks set on the side wall of the slide. The fixture uses non-magnetic materials and a detachable top head, and works with a pressure sensor to achieve accurate detection.
It effectively avoids rotational interference caused by magnetic field attraction, improves detection accuracy and stability, reduces production interruption rate and maintenance costs, enhances the versatility and adaptability of tooling, and improves detection efficiency.
Smart Images
Figure CN224471857U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of welding inspection technology in automobile manufacturing, specifically to a tooling for inspecting the limit nut of the B-pillar reinforcement component in automobiles. Background Technology
[0002] In the automotive manufacturing industry, the B-pillar, as a core component of the vehicle body structure, relies on welded limit nuts for precise connection to subsequent parts. The welding quality of these nuts directly impacts vehicle body strength, assembly accuracy, and safety performance. Defects such as incomplete welds, weak welds, or incomplete welds can lead to loose nuts or misalignment, causing assembly difficulties or safety hazards. Therefore, developing efficient and reliable inspection fixtures to ensure nut welding quality has become a crucial requirement for automotive production lines.
[0003] Traditional welding inspection equipment often uses mechanical contact or sensor-assisted methods to determine the presence of nuts or the quality of welding. These devices typically use a drive mechanism to push a probe to contact the nut and detect the nut by the feedback signal when the probe contacts the nut. However, in the welding workshop of resistance welding clamps, the strong magnetic field generated by the welding clamps significantly interferes with the moving parts of the inspection equipment. The inspection parts are often designed to have a certain degree of rotational freedom for easy installation and adjustment, but the magnetic attraction caused by the magnetic field can cause them to rotate uncontrollably in the direction of the magnetic field, with the rotation angle possibly exceeding ±30°, resulting in interference with the robot's motion path and causing the following problems: (1) flow diversion, resulting in incomplete or weak welds and reduced welding quality; (2) mechanical collision, where the welding clamp or robot impacts the inspection parts, causing equipment damage or production interruption.
[0004] Existing technologies attempt to mitigate electromagnetic interference in various ways. For example, some devices use fixed probes, restricting their rotational freedom, but this lacks flexibility and cannot adapt to the complexity of the surface shape of the B-pillar reinforcement, leading to blind spots or misjudgments. Other solutions introduce magnetic shielding materials (such as ferromagnetic alloy shells) to reduce the influence of magnetic fields, but this increases the weight and cost of the equipment, and the shielding effect is limited under high-intensity magnetic fields. Some devices optimize sensor signals through electronic compensation circuits, but this only addresses signal interference and cannot solve the problem of the probe's physical rotation. Other designs incorporate simple limiting grooves or clips on the base, but these passive limiting mechanisms are difficult to precisely control the rotation angle, especially in dynamic production environments, where the probe may still deflect due to magnetic attraction.
[0005] On the other hand, with the development of intelligent manufacturing, inspection fixtures need to balance efficiency, stability, and versatility to adapt to multi-variety, small-batch production. Existing equipment struggles to meet these requirements in electromagnetic interference environments, leading to decreased production efficiency and increased maintenance costs. Therefore, a new type of inspection fixture is urgently needed. Through optimized mechanical limiting structures and universal design, it can achieve stable probe movement in electromagnetic interference environments, eliminate interference risks, and simultaneously improve inspection accuracy and adaptability. Utility Model Content
[0006] In view of this, the purpose of this utility model is to solve the problems of trajectory interference, poor welding or machine collision caused by uncontrolled rotation of the detection component under electromagnetic interference, and to provide a tooling for detecting the limit nut of the B-pillar reinforcement of automobiles.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A tooling for detecting the limiter nut of a car B-pillar reinforcement includes a fixed base, a spring-loaded pin, a telescopic cylinder, a sensor, and a limiting structure. The spring-loaded pin is installed in a groove of the fixed base and can move axially within the groove. The telescopic cylinder is connected to one end of the spring-loaded pin and is used to drive its telescopic movement. The other end of the spring-loaded pin is provided with a spring-loaded pin head for detecting the limiter nut. The sensor is installed on the spring-loaded pin and is used to detect the feedback signal generated when the spring-loaded pin head contacts the limiter nut. The limiting structure includes a pair of stops, which are disposed on the side wall of the groove to limit the rotation angle of the spring-loaded pin under external electromagnetic interference.
[0009] Furthermore, the two stops in the limiting structure are symmetrically arranged, and the spacing between the stops is configured to limit the rotation angle of the spring pin to within ±°.
[0010] Furthermore, the spring pin is equipped with a spring inside, which compresses and deforms when it contacts the limiter nut.
[0011] Furthermore, the sensor is a pressure sensor, which contacts the spring to obtain the deformation pressure of the spring; the sensor is mounted on the outside of the spring top pin through a fixed bracket connected to the spring top pin.
[0012] Furthermore, the spring-loaded pin head is a detachable structure, and the spring-loaded pin head is connected to the spring-loaded pin by threads or snaps to adapt to limiter nuts of different sizes.
[0013] Furthermore, the fixed base includes a base plate and a side wall, and the slide groove is formed by the base plate and the side wall together. The width of the slide groove matches the outer dimensions of the spring pin.
[0014] Furthermore, the telescopic cylinder is connected to the fixed base via a fixed flange, which is located at the end of the fixed base.
[0015] Furthermore, the fixed base is made of a non-magnetic material, such as aluminum alloy or stainless steel.
[0016] The beneficial effects of this utility model are as follows:
[0017] This invention effectively limits the rotation angle of the spring pin to within ±12° under electromagnetic interference by setting a pair of stop blocks on the side wall of the chute. This avoids the uncontrolled rotation of the spring pin caused by magnetic field attraction in traditional inspection fixtures, thus eliminating the risk of interference with the robot trajectory, preventing incomplete or weak welds caused by flow diversion, and preventing equipment damage from welding clamp collisions. This not only improves the stability and reliability of welding inspection but also significantly reduces the incidence of production interruptions. In highly automated production lines in automobile manufacturing, this precision limiting design ensures the continuity and accuracy of the inspection process, reducing human intervention and maintenance costs.
[0018] Furthermore, the cooperation between the spring inside the spring-loaded pin and the sensor enables precise capture of the compression deformation feedback when the nut contacts. The sensor, as a pressure sensor, is installed on the outside of the spring-loaded pin through a fixed bracket and is in direct contact with the spring. It can obtain the deformation pressure in real time, realize the accurate judgment of the welding quality of the limiter nut, avoid misjudgment due to missed welding or position deviation, and improve the overall detection efficiency.
[0019] The spring-loaded pin head features a detachable structure, connected by threads or snaps, facilitating quick replacement of limit nuts of different sizes. This enhances the tooling's versatility and adaptability, making it suitable for flexible production models with diverse product types and small batches. The fixed base, with its sliding groove formed by the base plate and side walls, matches the dimensions of the spring-loaded pin, ensuring smooth movement. Furthermore, the use of non-magnetic materials such as aluminum alloy or stainless steel further reduces the influence of external magnetic fields, improving the tooling's long-term durability in strong electromagnetic environments. The telescopic cylinder, connected to the fixed base at both ends via a fixed flange, ensures a stable installation of the drive mechanism, preventing loosening caused by vibration.
[0020] Overall, this utility model features a simple structure and low cost, yet significantly improves inspection accuracy and production efficiency. According to actual application tests, under electromagnetic interference environments, the inspection accuracy using this fixture is increased by more than 15%, the equipment failure rate is reduced by 20%, and downtime is shortened by 30%, providing reliable assurance for the welding quality control of the limit nut of the automotive B-pillar reinforcement. The innovative design of this fixture not only solves the pain points of existing technologies but also provides a reference for welding inspection equipment in similar fields, possessing broad market application prospects and economic value.
[0021] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description
[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:
[0023] Figure 1 This is a schematic diagram of the overall fixture for detecting the limit nut of the B-pillar reinforcement of an automobile in this utility model.
[0024] Figure 2 for Figure 1 A schematic diagram of the installation of the top pin after being hit.
[0025] Reference numerals in the attached diagram: 1-Telescopic cylinder; 2-Top pin; 3-Sensor; 4-Top pin head; 5-Fixed base; 6-Limit baffle. Detailed Implementation
[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0028] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0029] Embodiment 1
[0030] As Figures 1-2 shown, it is a detection tooling for the limiter nut of the B-pillar reinforcement of an automobile, including a fixed base 5, a spring-loaded pin 2, a telescopic cylinder 1, a sensor 3 and a limiting structure.
[0031] The fixed base 5 includes a bottom plate and a side wall, jointly forming a chute, and the width of the chute matches the outer dimension of the spring-loaded pin 2. The spring-loaded pin 2 is installed in the chute and can slide axially. The telescopic cylinder 1 is connected to the end of the fixed base 5 through a fixed flange to drive the telescopic movement of the spring-loaded pin 2. One end of the spring-loaded pin 2 is provided with a detachable spring-loaded pin head 4, which is connected by threads and is adapted to the limiter nut of M8 size. The sensor 3 is a pressure sensor and is installed outside the spring-loaded pin 2 through a fixed bracket. There is a spring inside the spring-loaded pin 2, which generates compressive deformation when contacting the limiter nut, and the sensor 3 contacts the spring to obtain the deformation pressure. The limiting structure includes a pair of symmetrically arranged blocks located on the side wall of the chute, and the distance between the blocks is configured to limit the rotation angle of the spring-loaded pin 2 within ±12°. The fixed base 5 is made of an aluminum alloy non-magnetic material.
[0032] Detection process: The telescopic cylinder 1 pushes the spring-loaded pin 2 to make the spring-loaded pin head 4 contact the nut, the spring compresses, and the sensor 3 detects the pressure feedback. If the feedback is normal, it is determined that the nut welding is qualified; if there is no pressure, it is determined that there is a missed weld. This embodiment is applicable to the detection of standard M8 nuts. In an environment with a magnetic field strength of 300 Gauss, the rotation angle is controlled within ±10°, and the detection accuracy reaches 98%.
[0033] Embodiment 2
[0034] As Figures 1-2 shown, it is a detection tooling for the limiter nut of the B-pillar reinforcement of an automobile, including a fixed base 5, a spring-loaded pin 2, a telescopic cylinder 1, a sensor 3 and a limiting structure.
[0035] The fixed base 5 includes a base plate and side walls, which together form a sliding groove. The width of the sliding groove matches the outer dimensions of the spring-loaded pin 2. The spring-loaded pin 2 is installed in the sliding groove and can slide axially. The telescopic cylinder 1 is connected to the end of the fixed base 5 via a fixed flange, driving the spring-loaded pin 2 to extend and retract. One end of the spring-loaded pin 2 has a detachable spring-loaded pin head 4, which is connected by a snap-fit and fits an M10 size limit nut. The sensor 3 is a pressure sensor, installed on the outside of the spring-loaded pin 2 via a fixed bracket. The spring-loaded pin 2 has a spring inside, which compresses and deforms when it contacts the limit nut. The sensor 3 contacts the spring and obtains the deformation pressure. The limiting structure includes a pair of symmetrically arranged stops located on the side walls of the sliding groove. The distance between the stops is configured to limit the rotation angle of the spring-loaded pin 2 to within ±12°. The fixed base 5 is made of non-magnetic stainless steel.
[0036] Inspection process: Telescopic cylinder 1 pushes the spring pin 2, causing the spring pin head 4 to contact the nut. The spring is compressed, and sensor 3 detects the pressure feedback. If the feedback is normal, the nut welding is deemed qualified; if there is no pressure, it is deemed to be a leak. This embodiment is suitable for the inspection of large-size M10 nuts. In an environment with a magnetic field strength of 500 Gauss, the rotation angle is controlled within ±12°, the inspection accuracy reaches 97%, and it supports quick head replacement to adapt to production switchovers.
[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A tooling for testing the limit nut of a car B-pillar reinforcement component, characterized in that, The device includes a fixed base (5), a spring pin (2), a telescopic cylinder (1), a sensor (3), and a limiting structure. The spring pin (2) is installed in the groove of the fixed base (5) and can move axially in the groove. The telescopic cylinder (1) is connected to one end of the spring pin (2) and is used to drive its telescopic movement. The other end of the spring pin (2) is provided with a spring pin head (4) for detecting the limit nut. The sensor (3) is installed on the spring pin (2) and is used to detect the feedback signal generated when the spring pin head (4) contacts the limit nut. The limiting structure includes a pair of blocks, which are set on the side wall of the groove to limit the rotation angle of the spring pin (2) under external electromagnetic interference.
2. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 1, characterized in that, The two stops in the limiting structure are symmetrically arranged, and the spacing between the stops is configured to limit the rotation angle of the spring pin (2) to within ±12°.
3. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 1, characterized in that, The spring pin (2) is equipped with a spring inside, which compresses and deforms when it contacts the limit nut.
4. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 3, characterized in that, The sensor (3) is a pressure sensor. The sensor (3) contacts the spring to obtain the deformation pressure of the spring. The sensor (3) is installed on the outside of the spring pin (2) through a fixed bracket connected to the spring pin (2).
5. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 1, characterized in that, The spring-loaded pin head (4) is a detachable structure. The spring-loaded pin head (4) is connected to the spring-loaded pin (2) by threads or snaps to adapt to limiter nuts of different sizes.
6. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 1, characterized in that, The fixed base (5) includes a base plate and a side wall. The slide is formed by the base plate and the side wall together. The width of the slide matches the outer dimensions of the spring pin (2).
7. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 1, characterized in that, The telescopic cylinder (1) is connected to the fixed base (5) via a fixed flange, which is located at the end of the fixed base (5).
8. The inspection fixture for the limiter nut of the automotive B-pillar reinforcement as described in claim 1, characterized in that, The fixed base (5) is made of a non-magnetic material, which is aluminum alloy or stainless steel.