Simple measuring tool for detecting riveting concave-convex amount of self-plugging rivet and measuring method thereof

Abstract

The simple measuring tool comprises a measuring main body, a dial indicator, a measuring sleeve rod and a fastening bolt, the measuring main body is connected with a supporting leg, the bottom end of the supporting leg is connected with an adjustable balance foot, the dial indicator is arranged on the measuring sleeve rod, the dial indicator is provided with a probe, the probe penetrates through and extends to the bottom end of the measuring sleeve rod, and the fastening bolt is arranged on the measuring sleeve rod. The end, away from the dial indicator, of the measuring sleeve rod penetrates and extends to the bottom end of the measuring body, and the fastening bolt is connected to the side edge of the measuring body through threads and cooperatively abuts against and clamps the measuring sleeve rod. The measuring method of the measuring tool comprises the following steps: S1, mounting the measuring tool; and S2, measuring by using a measuring tool. According to the measuring tool, it is ensured that the end face of the measuring tool body is flush with the end face of a rivet through the adjustable balance foot, the riveting concave-convex amount is accurately measured through the measuring probe, and concave-convex data are accurately displayed through the dial indicator. The method is high in measurement efficiency, accurate in measurement, rapid in measurement, convenient and rapid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of core-pulling rivet riveting concave-convex measurement, and particularly relates to a simple gauge for detecting core-pulling rivet riveting concave-convex amount and a measurement method thereof. BACKGROUND

[0002] As a single-side operation fastener, core-pulling rivet has become a key connecting component in the field of aerospace due to its core advantages of "single-side closed environment adaptability", "flush joint surface after installation", "high mechanical strength" and "self-locking and anti-loosening". It is widely used in core parts such as aircraft fuselage skin, cabin frame, wing internal support structure, etc. Such components are in a high-altitude low-pressure, alternating vibration and temperature change environment for a long time, and the riveting quality directly determines the structure fatigue resistance and flight safety. For example, if the joint surface of the fuselage skin rivet is not flush, it will cause airflow disturbance, increase flight resistance and accelerate local structure wear; if the riveting of the cabin frame rivet is not flush, it will easily cause stress concentration, and in severe cases, it may cause structure cracking.

[0003] However, there has been a technical bottleneck in the quality detection link after the installation of core-pulling rivet. The core pain points are concentrated in the precise measurement of the flushness of the joint surface and the relative position of multiple end surfaces: the traditional detection tools mainly use vernier calipers and depth gauges, which have obvious limitations. On the one hand, the volume is large and depends on manual operation, which is difficult to realize the precise fitting of the detection reference and the rivet end surface in complex working conditions such as the curved skin of the aircraft wing and the engine cabin, and the data may be distorted due to the deviation of the measurement angle; on the other hand, when detecting large-size planes (such as the 1.5m x 2m area of the fuselage side wall), manual point-by-point measurement is extremely low in efficiency, and the time consumed for single-area detection is more than 3 times that of traditional bolt detection, which seriously restricts the production line rhythm.

[0004] More importantly, existing tools cannot meet the high-precision measurement requirements of "relative position of multiple end surfaces". The riveting reliability of core-pulling rivet depends on the cooperation of the core rod joint surface, the lock ring end surface and the rivet sleeve end surface - for example, the core rod joint surface needs to maintain coaxiality within 0.1mm with the rivet sleeve end surface, and the lock ring end surface needs to be controlled within the range of 0.05-0.2mm, if there is deviation in such parameters, it will directly reduce the riveting shear strength and anti-loosening ability. However, traditional tools can only measure the height of a single end surface at a single point, and cannot simultaneously obtain the relative position relationship of multiple end surfaces, resulting in detection results that can only determine "whether it is flush" and cannot quantify "the degree of deviation", which may easily lead to two problems: one is misjudgment of qualified parts, which increases the cost of rework; the other is the omission of unqualified parts, which releases rivets exceeding the tolerance, and hides potential structure safety hazards. SUMMARY

[0005] The purpose of this invention is to address the problems of low efficiency, difficulty in detection, and large errors in the measurement of riveting concavity and convexity of traditional blind rivets, and to provide a simple measuring tool and method for detecting the riveting concavity and convexity of blind rivets, so as to achieve accurate measurement of blind rivets in various industrial application environments.

[0006] The technical solution of the present invention: A simple measuring tool for detecting the concavity and convexity of a pull-out rivet includes a measuring body, a dial indicator, a measuring sleeve rod, and a fastening bolt. The measuring body is connected to a support leg, and an adjustable balance foot is connected to the bottom end of the support leg. The dial indicator is mounted on the measuring sleeve rod and is equipped with a probe that passes through and extends to the bottom end of the measuring sleeve rod. The end of the measuring sleeve rod away from the dial indicator passes through and extends to the bottom end of the measuring body. The fastening bolt is threaded to the side of the measuring body and engages to press and hold the measuring sleeve rod in place.

[0007] The support legs are provided in at least three and are evenly distributed to support the bottom of the measuring body.

[0008] The measuring body has threaded holes on both the top and bottom sides to facilitate the installation of the support legs. The top of the support leg is threadedly connected to the measuring body through the threaded hole. The bottom of the support leg is provided with an internal threaded cavity. The top of the adjustable balance foot is threadedly connected to the internal threaded cavity.

[0009] The measuring body has a through hole in the middle to facilitate the passage of the measuring sleeve rod. The side wall of the through hole is connected to a screw fixing hole, which penetrates the side of the measuring body. The fastening bolt matches the screw fixing hole.

[0010] The head of the fastening bolt is provided with anti-slip texture.

[0011] The measuring sleeve rod is a hollow rod that facilitates the passage of the probe, and the outer side of the measuring sleeve rod is provided with an anti-slip sleeve.

[0012] The anti-slip sleeve is made of silicone, nitrile rubber or polyurethane material, and the thickness of the anti-slip sleeve is 0.5-1mm.

[0013] The probe is a replaceable measuring probe that is easy to replace.

[0014] A simple measuring tool for detecting the unevenness or concavity of a blind rivet joint includes the following steps: Step S1: Measuring tool installation. Install the measuring tool on the surface of the machine body to be measured, align the probe with the measurement position of the core rod section of the core-pulling rivet to be measured, and adjust the adjustable balance feet to stabilize the main body of the measuring tool. Step S2: Measurement with measuring tool. Place the probe in contact with the end face of the rivet to be measured, then set the dial indicator to zero. Finally, slightly move the probe to contact the measurement position of the mandrel cross section, and finally read and record the dial indicator value to obtain the relative height of the mandrel cross section relative to the end face of the mandrel after the mandrel is riveted.

[0015] In step S1, the body surface includes a planar surface, a curved surface, and an arc surface.

[0016] The beneficial effects of this invention are: This application's measuring instrument uses adjustable balance feet to ensure that the end face of the measuring instrument body is flush with the end face of the rivet. The measuring probe accurately measures the riveting unevenness, and the unevenness data is accurately displayed through a dial indicator. This application can measure the flatness of the core rod cross-section after installation on flat, curved, and arc surfaces. It offers high measurement efficiency, accuracy, and speed, making it convenient and quick to use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a cross-sectional view of the measuring body of the present invention; Figure 4 This is a cross-sectional view of the support leg of the present invention; Figure 5 This is a schematic diagram of the adjustable balance foot of the present invention; Figure 6 This is a schematic diagram of the structure of the body surface.

[0018] Reference numerals: 1-Measuring body, 2-Adjustable balance foot, 3-Dial indicator, 4-Measuring sleeve rod, 5-Fasting bolt, 6-Support leg, 7-Probe, 8-Internal thread cavity, 9-Through hole, 10-Screw fixing hole, 11-Anti-slip sleeve, 12-Threaded hole, 13-Machine body surface, 14-Core rod cross-section, 15-Rivet end face. Detailed Implementation

[0019] refer to Figures 1-6 A simple measuring tool for detecting the concavity and convexity of a pull-out rivet includes a measuring body 1, a dial indicator 3, a measuring sleeve rod 4, and a fastening bolt 5. The measuring body 1 is connected to a support leg 6, and the bottom end of the support leg 6 is connected to an adjustable balance foot 2. The dial indicator 3 is mounted on the measuring sleeve rod 4 and is equipped with a probe 7. The probe 7 passes through and extends to the bottom end of the measuring sleeve rod 4. The end of the measuring sleeve rod 4 away from the dial indicator 3 passes through and extends to the bottom end of the measuring body 1. The fastening bolt 5 is threaded to the side of the measuring body 1 and cooperates to press and hold the measuring sleeve rod 4.

[0020] The support legs 6 are provided in at least three and are evenly distributed to support the bottom of the measuring body 1. Only when there are more than three support legs 6 that are not distributed on the same straight line can the measuring body 1 provide stable support.

[0021] The measuring body 1 has threaded holes 12 through its upper and lower sides to facilitate the installation of the support legs. The top of the support leg 6 is threadedly connected to the measuring body 1 through the threaded holes 12. The bottom of the support leg 6 is provided with an internal threaded cavity 8. The top of the adjustable balance foot 2 is threadedly connected to the internal threaded cavity 8.

[0022] The top of the adjustable balance foot 2 is connected to the internal thread cavity 8 through a threaded connection, mainly to facilitate the adjustment of the measuring body 1 to ensure stable measurement; the top of the support leg 6 is threaded to the measuring body 1 through a threaded hole 12, so that when the adjustable balance foot 2 reaches its height limit, the measuring body 1 can be adjusted as an auxiliary adjustment.

[0023] The measuring body 1 has a through hole 9 in the middle to facilitate the passage of the measuring sleeve rod 4. The side wall of the through hole 9 is connected to a screw fixing hole 10, which penetrates the side of the measuring body 1. The fastening bolt 5 matches the screw fixing hole 10. This design is mainly used to fix the dial indicator 3 after its height is fixed, by rotating the fastening bolt 5 to make the fastening bolt 5 press against the measuring sleeve rod 4, thereby effectively preventing the influence of the measuring sleeve rod 4 and the dial indicator 3 shaking on the measurement.

[0024] The head of the fastening bolt 5 is provided with anti-slip grooves 13. This feature is mainly to facilitate manual rotation of the fastening bolt 5 and prevent slippage.

[0025] The measuring sleeve rod 4 is a hollow rod that facilitates the passage of the probe 7, and an anti-slip sleeve 11 is provided on the outer side of the measuring sleeve rod 4. The anti-slip sleeve 11 is mainly to prevent the measuring sleeve rod 4 from slipping and to ensure the stable operation of the measuring instrument.

[0026] The anti-slip sleeve 11 is made of silicone, nitrile rubber, or polyurethane material, and its thickness is 0.5-1mm. Silicone, nitrile rubber, or polyurethane material has moderate elasticity, strong friction, and is wear-resistant and not prone to aging, thus maintaining its anti-slip effect for a long time. An excessively thick anti-slip sleeve 11 may affect the assembly clearance between the measuring rod 4 and the dial indicator 3, affecting measurement; an excessively thin sleeve will have insufficient anti-slip effect, while a thickness of 0.5-1mm is more suitable.

[0027] The probe 7 is a replaceable measuring probe that is easy to replace. This feature is mainly to facilitate the replacement of probe 7, making the measuring instrument of this application more practical.

[0028] A simple measuring tool for detecting the unevenness or concavity of a blind rivet joint includes the following steps: Step S1: Install the measuring tool. Install the measuring tool on the surface 13 of the machine body to be measured, align the probe 7 with the measurement position of the core rod section 14 of the core rivet to be measured, and adjust the adjustable balance foot 2 to stabilize the measuring tool body 1. Step S2: Measurement with a measuring tool. Place probe 7 in contact with the rivet end face 15 of the blind rivet to be measured. Then, zero the dial indicator 3. Finally, slightly move probe 7 to contact the measurement position of the mandrel cross-section 14. Read and record the value of dial indicator 3 to obtain the relative height of the mandrel cross-section 14 relative to the blind rivet end face 15 after riveting. The measuring tool method of this application is simple to operate, accurate, and allows for rapid measurement, making it convenient and quick.

[0029] In step S1, the body surface 10 includes a planar surface, a curved surface, and an arc surface.

[0030] This application's measuring instrument uses adjustable balance feet to ensure that the end face of the measuring instrument body 1 is flush with the end face 15 of the rivet. The measuring probe accurately measures the riveting unevenness, and the unevenness data is accurately displayed by a dial indicator. This application can measure the flatness of the core rod cross-section of riveted products after installation on flat, curved, and arc surfaces. It has high measurement efficiency, accuracy, and can be measured quickly and conveniently.

Claims

1. A simple measuring tool for detecting the protrusion and concavity of a pull-core rivet, characterized in that... The device includes a measuring body (1), a dial indicator (3), a measuring sleeve rod (4), and a fastening bolt (5). The measuring body (1) is connected to a support leg (6), and the bottom end of the support leg (6) is connected to an adjustable balance foot (2). The dial indicator (3) is mounted on the measuring sleeve rod (4), and the dial indicator (3) is equipped with a probe (7). The probe (7) passes through and extends to the bottom end of the measuring sleeve rod (4). The end of the measuring sleeve rod (4) away from the dial indicator (3) passes through and extends to the bottom end of the measuring body (1). The fastening bolt (5) is threaded to the side of the measuring body (1) and cooperates to press and hold the measuring sleeve rod (4).

2. The simple measuring tool for detecting the concavity and convexity of riveting of a core-pulling rivet according to claim 1, characterized in that: The support legs (6) are provided in at least three parts and are evenly distributed to support the bottom of the measuring body (1).

3. The simple measuring tool for detecting the concavity and convexity of riveting of a core-pulling rivet according to claim 2, characterized in that: The measuring body (1) has threaded holes (12) through its upper and lower sides to facilitate the installation of the support legs. The top of the support leg (6) is threadedly connected to the measuring body (1) through the threaded holes (12). The bottom of the support leg (6) is provided with an internal thread cavity (8). The top of the adjustable balance foot (2) is connected to the internal thread cavity (8) through a threaded fit.

4. The simple measuring tool for detecting the concavity and convexity of riveting of a core-pulling rivet according to claim 1, characterized in that: The measuring body (1) has a through hole (9) in the middle to facilitate the passage of the measuring sleeve rod (4). The side wall of the through hole (9) is connected to a screw fixing hole (10). The screw fixing hole (10) passes through the side of the measuring body (1). The fastening bolt (5) matches the screw fixing hole (10).

5. The simple measuring tool for detecting the concavity and convexity of riveting of a core-pulling rivet according to claim 4, characterized in that: The head of the fastening bolt (5) is provided with anti-slip texture (13).

6. The measurement method of the simple measuring tool for detecting the concavity and convexity of the riveting of the core-pulling rivet according to claim 1, characterized in that: The measuring sleeve rod (4) is a hollow rod that facilitates the passage of the probe (7), and the outer side of the measuring sleeve rod (4) is provided with an anti-slip sleeve (11).

7. The measurement method of the simple measuring tool for detecting the concavity and convexity of the riveting of the core-pulling rivet according to claim 6, characterized in that: The anti-slip sleeve (11) is made of silicone, nitrile rubber or polyurethane material, and the thickness of the anti-slip sleeve (11) is 0.5-1mm.

8. The simple measuring tool for detecting the concavity and convexity of riveting of a core-pulling rivet according to claim 1, characterized in that: The probe (7) is a replaceable measuring probe that is easy to replace.

9. A method for measuring the concavity and convexity of a simple measuring tool for detecting the riveting concavity and convexity of a core-pulling rivet according to any one of claims 1-8, characterized in that: Includes the following steps: Step S1: Install the measuring tool. Install the measuring tool on the surface (13) of the machine body to be measured, align the probe (7) with the measuring position of the core rod section (14) of the core rivet to be measured, and adjust the adjustable balance foot (2) to stabilize the measuring tool body (1). Step S2: Measurement with measuring tool. Place the probe (7) in contact with the end face (15) of the rivet to be measured, then set the dial indicator (3) to zero, and finally move the probe (7) slightly to contact the measurement position of the core rod section (14). Finally, read and record the value of the dial indicator (3) to obtain the relative height of the core rod section (14) relative to the end face (15) of the rivet after the rivet is riveted.

10. The measurement method of the simple measuring tool for detecting the concavity and convexity of the riveting of the core-pulling rivet according to claim 9, characterized in that: In step S1, the body surface (13) includes a planar surface, a curved surface and an arc surface.

Images