Tool for detecting diameter of bulge of self-plugging rivet

Abstract

The utility model relates to the technical field of machine manufacturing and detection, in particular to a tool for detecting the bulge diameter of a self-plugging rivet, which comprises a detection body, the detection body comprises a holding part, and one end of the holding part is fixedly connected with a detection part through a connecting part; the detection part and the connection part are arranged in parallel; and the detection part is provided with a detection groove capable of detecting a bump. The utility model aims to provide a tool capable of measuring whether the size of a bulge meets the design requirement after rivets with different interlayer lengths are riveted.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical manufacturing and testing technology, and relates to a tooling for detecting the diameter of the bulge of a core-pulling rivet. Background Technology

[0002] In numerous industrial sectors such as aerospace, automotive manufacturing, and machinery equipment, blind rivets are widely used as crucial fasteners. The riveting quality of blind rivets directly affects the overall performance and safety of products, with the size of the bulge after riveting being a key indicator of quality. Whether the bulge diameter meets design requirements not only affects the tightness between the connected parts but also significantly impacts the fatigue life and sealing performance of the structure. As industrial manufacturing demands increasingly higher product quality and reliability, accurate detection of the blind rivet bulge diameter is of paramount importance.

[0003] However, in production practice and actual use, there are many challenges in detecting the diameter of the bulge in blind rivets. On the one hand, different types of blind rivets come in a wide variety of specifications, especially when different interlayer lengths are involved, resulting in significant differences in the size range of the bulge after riveting, making it difficult to accurately measure using a single general-purpose measuring tool. On the other hand, traditional testing methods, such as using vernier calipers and other conventional measuring tools, are not only cumbersome to operate and inefficient, but their measurement accuracy also fails to meet increasingly stringent quality standards. Furthermore, some testing methods may damage the bulge surface due to contact measurement, affecting the subsequent performance of the rivet.

[0004] After reviewing relevant materials, several solutions have been attempted to address the aforementioned issues. For example, patent CN119178540A, titled "A Measuring Device for the Holding Force of a Blind Rivet Core Rod," primarily uses a specific structural design to ensure the top rod accurately abuts against the core rod axis to measure the holding force. However, this patent mainly focuses on measuring the holding force, not the bulge diameter, thus offering limited help in solving the bulge diameter detection problem. Another approach involves using optical inspection equipment for blind rivet inspection. Some devices can measure the dimensions of blind rivets, including total length and flange diameters. However, for detecting the bulge diameter, a special dimension, optical inspection equipment is affected by factors such as the irregular shape of the bulge and reflections, making it difficult to guarantee measurement accuracy and stability. Furthermore, the equipment cost is high, hindering its widespread application in different production scenarios. Summary of the Invention

[0005] This utility model provides a tooling for detecting the diameter of the bulge in a pull rivet, which can measure whether the bulge size after riveting rivets of different interlayer lengths meets the design requirements.

[0006] To solve the above problems, the technical solution adopted by the invention is as follows:

[0007] A tooling for detecting the diameter of a bulge in a pull rivet includes a detection body, the detection body including a holding part, one end of which is fixedly connected to the detection part via a connecting part; the detection part and the connecting part are arranged parallel to each other; the detection part is provided with a detection groove for detecting bulges.

[0008] The principle and advantages of this scheme are as follows:

[0009] The testing fixture consists of a holding part, a connecting part, and a testing part. The testing part is equipped with a testing groove that matches the diameter of a qualified bulge. During testing, the titanium alloy blind rivet is first passed through the riveting plate and riveted together. Then, the fixture is held so that the testing groove contacts the surface of the bulge. The dimensional compliance is determined by observing the interference fit between the bulge and the testing groove: if the bulge can be fully inserted into the testing groove without obvious gaps or jamming, its diameter meets the design requirements; if it cannot be inserted or the gap is too large, it is considered unqualified.

[0010] Compared to existing technologies, which require each rivet to be aligned, read, and compared to a standard value when using vernier calipers or optical equipment to measure the diameter of a bulge, the current solution allows for easy measurement by simply holding a tool against the bulge and setting the limit dimensions of the detection groove.

[0011] Traditional contact measuring tools such as vernier calipers rely on the operator's reading accuracy, which is prone to misjudgment due to human factors such as line of sight angle and force control. This solution transforms abstract dimensional values ​​into intuitive "passability" judgments through the physical limit of the detection groove, completely eliminating human reading interference.

[0012] Furthermore, the detection section has a hollow structure and a telescopic part is provided inside. The telescopic part is connected by a second slide rail and is horizontally slidable along the direction of the handle. The telescopic part flexibly changes the actual measurement distance of the detection groove according to the diameter of the bulge. When detecting rivets with different interlayer lengths or outer diameters, the operator can manually or automatically adjust the sliding position of the telescopic part so that the detection groove can accurately fit the standard size range of the target bulge.

[0013] Furthermore, the telescopic section is hollow and contains a first parallel slide rail. Two parallel detection rods are mounted on this first slide rail, and these rods are connected to an electric slide rail. The detection rods slide horizontally via the electric slide rail, allowing adjustment of the distance between them. This dynamic adjustment of the spacing between the two detection rods can be achieved according to the required bulge size, avoiding the drawbacks of frequently changing traditional fixed-specification tooling. For example, when inspecting titanium alloy blind rivets with the same outer diameter but different interlayer lengths, there is no need to change the tooling; simply adjusting the distance between the detection rods via the electric slide rail is sufficient to cover the entire measurement range.

[0014] Furthermore, a sensor is installed on the detection rod. This sensor is a contact displacement sensor, which converts mechanical displacement into an electrical signal through direct contact with the bulge surface. Compared to optical sensors, which are easily affected by surface roughness and reflection, contact measurement can effectively avoid interference from oxide layers, oil stains, and other contaminants on the bulge surface.

[0015] Furthermore, the gripping part is equipped with a controller, which is a PLC controller. The controller is electrically connected to the first slide rail and the second slide rail. The displacement data collected by the sensor can be transmitted to the controller in real time, and the result can be automatically determined through a preset qualified range.

[0016] Furthermore, the sensor is electrically connected to the controller. Through the connection between the sensor and the controller, the bulge diameter data collected by the sensor in real time can be directly transmitted to the controller. The bulge diameter data collected by the contact displacement sensor in real time is quickly transmitted to the controller. The controller converts the data into a diameter value in real time using a preset algorithm and compares it with the standard value, and automatically outputs the qualified / unqualified judgment result.

[0017] Furthermore, the distance between the gripping part and the detection part is greater than the height of the pop rivet after riveting. When the detection part contacts the bulge, the gripping part maintains sufficient space with the surface of the riveting plate, allowing the operator to easily hold the fixture and adjust the angle, avoiding hand compression or fixture bumps due to limited space. If the distance between the gripping part and the detection part is too short, it cannot accommodate higher bulges, and forced operation may cause wear on the fixture's detection groove or scratches on the surface of the riveting plate. With sufficient distance, the fixture can be inserted vertically or at an angle into the rivet gap, flexibly adapting to complex assembly environments, while reducing the risk of secondary damage to riveted workpieces during the detection process.

[0018] Furthermore, the detection rods slide synchronously in opposite directions, and through mechanical linkage or a servo control system, the two detection rods move in opposite directions at the same speed, always maintaining the symmetrical origin of the bulge's central axis for spacing adjustment. For example, when detecting a circular bulge, synchronous reverse sliding ensures that both detection rods simultaneously contact the highest points on both sides of the bulge, avoiding diameter measurement errors caused by sequential contact or unilateral offset. In addition, this mechanism can adapt to the measurement of the maximum inscribed circle of irregular bulges. Even if there are local protrusions or depressions on the bulge surface, the synchronously reverse sliding detection rods can automatically capture the position of the maximum diameter by dynamically conforming to the contours on both sides, which is more flexible than the traditional measurement method with a fixed reference edge. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram illustrating the use of this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0022] The reference numerals in the accompanying drawings include: 1. Measuring body; 2. Bulge; 3. Riveting plate; 4. Blind rivet; 5. Holding part; 6. Detection part; 7. Detection groove; 8. Connecting part; 9. Controller; 10. Detection rod; 11. Sensor; 12. First slide rail; 13. Telescopic groove; 14. Second slide rail.

[0023] Example 1 is basically as follows Figure 1-3 As shown, a tooling for detecting the diameter of the bulge in a pull rivet includes a detection body 1, which includes a holding part 5. One end of the holding part 5 is fixedly connected to a detection part 6 via a connecting part 8. The detection part 6 and the connecting part 8 are arranged in parallel. The detection part 6 is provided with a detection groove 7 for detecting the bulge.

[0024] The detection unit 6 is equipped with a telescopic part 13, which is slidably connected to a second slide rail 14 and can slide horizontally along the direction of the handle 5 to flexibly change the actual measurement distance of the detection slot 7. The telescopic part 13 is hollow and has a parallel first slide rail 12 inside. Two parallel detection rods 10 are installed on the first slide rail 12. The detection rods 10 cooperate with an electric slide rail and can slide horizontally through the electric slide rail to adjust the distance.

[0025] A contact displacement sensor 11 is installed on the detection rod 10, and a PLC controller 9 is installed on the handle 5. The controller 9 is electrically connected to the drive mechanism of the first slide rail 12 and the second slide rail 14 and the sensor 11, and can receive sensor data and control the movement of the slide rail.

[0026] The vertical distance between the holding part 5 and the detection part 6 is greater than the height of the mandrel 4 after riveting, ensuring sufficient space between the holding part 5 and the surface of the riveting plate 3 during detection. The detection rod 10 can achieve synchronous horizontal reverse sliding through mechanical linkage or a servo control system.

[0027] The specific usage process is as follows:

[0028] The titanium alloy blind rivet 4 is passed through the riveting plate 3 and riveted to form a bulge 2. The operator holds the handle 5 and, according to the interlayer length and outer diameter of the rivet to be tested, uses the controller 9 or manual operation to make the telescopic part 13 slide along the second slide rail 14 to adjust the position of the detection part 6 so that the detection groove 7 is initially aligned with the bulge 2.

[0029] Both the first slide rail 12 and the second slide rail 14 are electrically operated. The controller 9 controls the drive mechanisms on the first slide rail 12 and the second slide rail 14, thereby controlling the sliding of the first slide rail 12 and the second slide rail 14. This drives the two detection rods 10 to slide synchronously in opposite directions. The distance between the two detection rods 10 is dynamically adjusted according to the size requirements of the bulge 2, so that the detection groove 7 accurately fits the standard size range of the target bulge. For example, when detecting rivets with the same outer diameter but different interlayer lengths, there is no need to change the tooling; only the distance between the detection rods 10 needs to be adjusted.

[0030] The detection groove 7 is brought into contact with the surface of the bulge 2, and the contact displacement sensor 11 is in direct contact with the surface of the bulge 2. The mechanical displacement is converted into an electrical signal and transmitted to the controller 9 in real time. The controller 9 converts the electrical signal into a diameter value through a preset algorithm, compares it with the preset qualified range standard value, and automatically outputs the qualified / unqualified judgment result.

[0031] If the bulge 2 can be fully embedded in the detection slot 7, and the data transmitted from the sensor 11 to the controller 9 is within the acceptable range without obvious gaps or jamming, then the diameter is determined to meet the design requirements; if it cannot be embedded in the detection slot 7 or the data shows that the gap is too large and exceeds the acceptable range, then it is determined to be unacceptable.

[0032] During the inspection process, due to the ample distance between the gripping part 5 and the inspection part 6, the operator can easily hold the fixture and adjust its angle. The fixture can be inserted vertically or at an angle into the rivet gap, flexibly adapting to complex assembly environments and avoiding hand compression, fixture bumps, or workpiece damage caused by space constraints. The synchronous reverse sliding mechanism of the inspection rod 10 ensures simultaneous contact with the highest points on both sides of the bulge 2, accurately capturing the maximum diameter position of circular or irregular bulges, effectively improving inspection accuracy and efficiency.

[0033] The above are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are able to access all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims.

[0034] The detailed embodiments and other descriptions can be used to interpret the content of the claims.

Claims

1. A tooling for detecting the diameter of a bulge in a pull rivet, comprising a detection body, the detection body including a holding part, one end of which is fixedly connected to the detection part via a connecting part; the detection part and the connecting part are arranged parallel to each other; the detection part is provided with a detection groove for detecting bulges.

2. The tooling for detecting the diameter of the bulge in a pull rivet according to claim 1, characterized in that, The detection section has a hollow structure and a telescopic section inside. The telescopic section is connected by a second slide rail and is horizontally slidable along the direction of the gripping section.

3. The tooling for detecting the diameter of the bulge in a pull rivet according to claim 2, characterized in that, The telescopic section is hollow and has a first slide rail arranged in parallel. Two detection rods are arranged in parallel on the first slide rail. The detection rods are connected to an electric slide rail and slide horizontally through the electric slide rail to adjust the distance between the detection rods.

4. The tooling for detecting the diameter of the bulge in a pull rivet according to claim 3, characterized in that, The detection rod is equipped with a sensor, which is a contact displacement sensor.

5. The tooling for detecting the diameter of the bulge in a pull rivet according to claim 1, characterized in that, The gripping part is equipped with a controller, which is a PLC controller, and the controller is electrically connected to the first slide rail and the second slide rail.

6. A tooling for detecting the diameter of a bulge in a pull rivet according to claim 4, characterized in that, The sensor is electrically connected to the controller.

7. The tooling for detecting the diameter of the bulge in a pull rivet according to claim 1, characterized in that, The distance between the holding part and the detection part is greater than the height of the pull rivet after it is riveted.

8. A tooling for detecting the diameter of a bulge in a pull-rivet according to claim 3, characterized in that, The detection rod slides horizontally in opposite directions synchronously.

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