A device for detecting concave-convex defects on the outer surface of a seamless steel pipe

Abstract

The utility model discloses a kind of outer surface concave-convex defect detection devices of seamless steel pipe, including bottom plate, the detection mechanism for detecting whether the outer surface of seamless steel pipe is smooth is provided in the top of bottom plate, the fixture mechanism of the detection mechanism one end is provided to the seamless steel pipe of different specifications and is detected, the placement mechanism for placing seamless steel pipe is provided in the top of bottom plate;The utility model is detected by being provided with detection mechanism, and contact plate is tightly attached to steel pipe surface using constant pressure exerted by spring.When there is concave-convex defect on the surface of steel pipe, pressure sensor can sensitively perceive the subtle change of pressure, and convert defect into quantifiable electric signal.Compared with the detection blind area that may exist in fixed laser scanning in prior art, the contact detection method of the device can realize full circumferential, continuous dead-angle-free detection on the outer surface of steel pipe, significantly improve defect detection rate and measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of seamless steel pipe production technology, specifically to a device for detecting unevenness defects on the outer surface of seamless steel pipes. Background Technology

[0002] The seamless steel pipe outer surface unevenness defect detection device is an automated industrial inspection device that integrates optical, mechanical, electronic and computer technologies. Its core function is to identify, locate and record various unevenness defects on the outer surface of seamless steel pipes in real time, online and with high precision, without contacting the steel pipe surface.

[0003] Referring to the existing Chinese patent with publication number CN210720196U, a seamless steel pipe outer surface inspection device is disclosed, which relates to the field of mechanical technology. It includes a base plate, and a first transfer plate is fixedly connected to the upper left front and rear sides of the base plate through support legs. The right side of the first transfer plate has an insertion hole, and a stop rod is movably inserted into the insertion hole. A rubber block is fixedly connected to the left end of the stop rod, and a rectangular groove is opened on the upper left side of the rubber block. A support frame is fixedly connected to the upper left front and rear sides of the base plate. A turntable is connected to the upper front end of the support frame through a rotating shaft. A support rod is fixedly connected to the outer side of the turntable. A second transfer plate is fixedly connected to the upper right side of the base plate through support legs.

[0004] The aforementioned seamless steel pipe outer surface inspection device, through its overall structure and automated inspection system, enables real-time detection of the three-dimensional dimensions and surface defects of steel pipes. It features non-contact operation, high precision, high speed, high automation, and high robustness. However, this device still has some drawbacks, such as: potential blind spots in the detection coverage: the laser scanner in this patent is fixedly mounted on the left and right sides of an octagonal support. This layout may result in incomplete scanning of the top, bottom, and sides of the steel pipe. The impact of the steel pipe rotation mechanism on the inspection effect: the patent mentions the structure of the turntable and support rod, but the stability and accuracy of its rotation drive are not clearly explained. If the steel pipe experiences axial movement or radial runout during rotation, it will change the relative position of the laser scanner and the steel pipe surface, directly affecting the accuracy of the three-dimensional point cloud data, thus impacting the accuracy of defect identification and dimensional measurement. Therefore, we need to propose a seamless steel pipe outer surface unevenness defect detection device. Utility Model Content

[0005] The purpose of this invention is to provide a device for detecting unevenness defects on the outer surface of seamless steel pipes, which has the advantage of comprehensive detection of the surface of seamless steel pipes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a seamless steel pipe outer surface concavity and convexity defect detection device, comprising a base plate, a detection mechanism for detecting whether the outer surface of the seamless steel pipe is smooth is provided above the base plate, a clamping mechanism for detecting seamless steel pipes of different specifications is provided at one end of the detection mechanism, a placement mechanism for placing the seamless steel pipe is provided at the top of the base plate, and a moving mechanism for pushing the seamless steel pipe for detection is provided above the base plate.

[0007] Preferably, the detection mechanism includes a bracket, which is disposed above the base plate. A mounting frame is disposed above the bracket, and a sleeve is disposed on the inner wall of the mounting frame. A pressure sensor is disposed at the bottom of the sleeve, and a spring is disposed inside the sleeve. One end of the spring is connected to the bottom of the sleeve, and a mounting block is connected to the end of the spring away from the bottom of the sleeve.

[0008] Preferably, the clamping mechanism includes a contact plate disposed at one end of the mounting block. The contact plate has a mounting hole on its surface, which extends through the contact plate into the interior of the mounting block. A bolt is threaded into the interior of the mounting hole.

[0009] Preferably, the placement mechanism includes a support leg, which is disposed on the top of the base plate, and a placement groove is provided above the support leg, the height of which is adapted to the contact plate.

[0010] Preferably, the moving mechanism includes a first electric guide rail, which is disposed above the base plate. A first mounting plate is disposed above the moving end of the first electric guide rail. A second electric guide rail is disposed on one side of the first mounting plate. A second mounting plate is disposed at the moving end of the second electric guide rail. A third electric guide rail is disposed below the second mounting plate. A pushing mechanism is disposed at the moving end of the third electric guide rail.

[0011] Preferably, the pushing mechanism includes a servo electric cylinder, which is mounted on the moving end of the third electric guide rail, and the output end of the servo electric cylinder is provided with a push plate.

[0012] Preferably, a controller is provided above the base plate, and the controller is electrically connected to the pressure sensor, the first electric guide rail, the second electric guide rail, the third electric guide rail and the servo electric cylinder.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention employs a detection mechanism that uses a spring to apply constant pressure, keeping the contact plate firmly against the steel pipe surface. When the steel pipe surface has unevenness or defects, the pressure sensor can sensitively detect minute changes in pressure and convert the defects into quantifiable electrical signals. Compared to the potential blind spots in existing fixed laser scanning technologies, this device's contact detection method enables continuous, circumferential, and dead-angle-free detection of the steel pipe's outer surface, significantly improving defect detection rate and measurement accuracy. This invention solves the problem of poor adaptability to different specifications of steel pipes in existing technologies by incorporating a flexibly adjustable clamping mechanism and a multi-degree-of-freedom moving mechanism. The clamping mechanism can quickly adapt to various pipe diameters by replacing contact plates of different sizes and fixing them with bolts; the moving mechanism, through the coordinated operation of the first, second, and third electric guide rails and servo cylinders, can precisely control the pusher plate to push the steel pipe past the detection position with a stable posture and speed, ensuring stable and reliable detection conditions for steel pipes of different lengths, diameters, and weights, greatly improving the device's versatility and production efficiency. This invention effectively overcomes the problems of swaying or jumping caused by the rotation of steel pipes in existing technologies by setting up a dedicated placement mechanism and an integrated control system. The placement groove provides stable support for the steel pipe, and the precise pushing of the moving mechanism replaces the rotation of the steel pipe, fundamentally avoiding detection errors caused by unstable rotation. At the same time, the controller centrally coordinates and controls all actuators and sensors, ensuring the smooth and orderly operation of the entire detection process, improving the overall stability of the device and the reliability of the detection results. Attached Figure Description Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the first mounting plate of this utility model; Figure 3 This is a sectional view of the mounting frame of this utility model; Figure 4 This utility model Figure 2 Enlarged view of point A.

[0014] In the diagram: 1. Base plate; 2. Bracket; 3. Mounting frame; 4. Sleeve; 5. Pressure sensor; 6. Spring; 7. Mounting block; 8. Contact plate; 9. Mounting hole; 10. Bolt; 11. Support leg; 12. Placement slot; 13. First electric guide rail; 14. First mounting plate; 15. Second electric guide rail; 16. Second mounting plate; 17. Third electric guide rail; 18. Servo cylinder; 19. Push plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: a seamless steel pipe outer surface unevenness defect detection device, including a base plate 1, and a detection mechanism for detecting whether the outer surface of the seamless steel pipe is smooth is arranged above the base plate 1; the detection mechanism includes a bracket 2, the bracket 2 is arranged above the base plate 1, a mounting frame 3 is arranged above the bracket 2, a sleeve 4 is arranged on the inner wall of the mounting frame 3, a pressure sensor 5 is arranged at the bottom of the sleeve 4, a spring 6 is arranged inside the sleeve 4, one end of the spring 6 is connected to the bottom of the sleeve 4, and the end of the spring 6 away from the bottom of the sleeve 4 is connected to a mounting block 7.

[0017] The contact plate 8 at one end of the mounting block 7 remains in contact with the surface of the moving steel pipe under the preload of the spring 6. When the steel pipe surface is smooth, the pressure sensor 5 senses a stable pressure value; when encountering a protrusion or depression, the contact plate 8 is raised or lowered accordingly. The spring 6 provides a constant initial pressure, allowing the mounting block 7 and the contact plate 8 to float up and down. When the contact plate 8 is displaced due to surface defects, it compresses or releases the spring 6, causing a change in the force applied to the pressure sensor 5 at the bottom of the sleeve 4. The pressure sensor 5 converts this change in force into an electrical signal and outputs it to the controller, which determines whether a defect exists based on a preset pressure threshold.

[0018] One end of the testing mechanism is equipped with a clamping mechanism for testing seamless steel pipes of different specifications; the clamping mechanism includes a contact plate 8, which is located at one end of the mounting block 7. The surface of the contact plate 8 is provided with a mounting hole 9, which extends through the contact plate 8 into the interior of the mounting block 7. A bolt 10 is installed in the internal thread of the mounting hole 9.

[0019] When inspecting seamless steel pipes of different diameters, the operator loosens bolt 10, removes the current contact plate 8, replaces it with a contact plate 8 that better matches the pipe diameter, and then tightens bolt 10 to secure it to the mounting block 7. This mechanism achieves detachable fixing between the contact plate 8 and the mounting block 7 through the threaded connection of the mounting hole 9 and bolt 10. This modular design allows the inspection end contact plate 8 to be replaced according to the curvature of the steel pipe, ensuring good and stable contact between the contact plate 8 and the pipe surface, improving inspection accuracy and adaptability.

[0020] The top of the base plate 1 is provided with a placement mechanism for placing seamless steel pipes; the placement mechanism includes a support leg 11, which is located on the top of the base plate 1, and a placement groove 12 is provided above the support leg 11, the height of which is adapted to the contact plate 8.

[0021] The steel pipe is placed in the placement groove 12 supported by the outrigger 11, awaiting the movement mechanism to push it. The outrigger 11 raises the placement groove 12 to a suitable working height. The U-shaped design of the placement groove 12 can stably support the steel pipe, and its height is adapted to the working height of the contact plate 8, ensuring that the axis of the steel pipe is in the correct relative position with the detection surface of the contact plate 8 when it is pushed, providing a stable reference for detection.

[0022] A moving mechanism for pushing seamless steel pipes for inspection is provided above the base plate 1; the moving mechanism includes a first electric guide rail 13, which is located above the base plate 1. A first mounting plate 14 is provided above the moving end of the first electric guide rail 13. A second electric guide rail 15 is provided on one side of the first mounting plate 14. A second mounting plate 16 is provided at the moving end of the second electric guide rail 15. A third electric guide rail 17 is provided below the second mounting plate 16. A pushing mechanism is provided at the moving end of the third electric guide rail 17.

[0023] The controller first moves the first electric guide rail 13 to adjust the initial position of the pushing mechanism along the length of the base plate 1; then it moves the second electric guide rail 15 to adjust the position of the pushing mechanism along the width, aligning it with the end face of the steel pipe; finally, it raises and lowers the third electric guide rail 17 to align the push plate 19 with the axis height of the steel pipe. The moving mechanism, through these three linear motion modules (first electric guide rail 13, second electric guide rail 15, and third electric guide rail 17), constitutes a three-dimensional Cartesian coordinate robot. This moving mechanism can precisely adjust the spatial position of the push plate 19 at the end of the pushing mechanism in three degrees of freedom, thereby accurately aligning it with steel pipes of different placement positions and specifications.

[0024] The driving mechanism includes a servo cylinder 18, which is mounted on the moving end of the third electric guide rail 17, and a push plate 19 is provided at the output end of the servo cylinder 18.

[0025] Once the pushing mechanism has completed its positioning, the controller activates the servo cylinder 18. The output end of the servo cylinder 18 extends, driving the push plate 19 to press against the end face of the steel pipe and push it forward at a constant speed in the placement groove 12, allowing it to smoothly pass through the detection point of the detection mechanism. The servo cylinder 18, as the final actuating element, provides a smooth and controllable linear thrust. The push plate 19 contacts the end face of the steel pipe, ensuring uniform thrust. The high control precision of the servo cylinder 18 guarantees that the steel pipe can be pushed at a constant speed, which is crucial for obtaining stable and comparable detection results.

[0026] A controller is mounted above the base plate 1, and is electrically connected to the pressure sensor 5, the first electric guide rail 13, the second electric guide rail 15, the third electric guide rail 17, and the servo cylinder 18. The controller acts as the brain of the device, processing sensor signals and sending precise action commands to all electric actuators, thus achieving full automation, intelligence, and integrated control of the detection process.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting unevenness defects on the outer surface of a seamless steel pipe, comprising a base plate (1), characterized in that: A detection mechanism for detecting whether the outer surface of the seamless steel pipe is smooth is provided above the base plate (1). A clamping mechanism for detecting seamless steel pipes of different specifications is provided at one end of the detection mechanism. A placement mechanism for placing seamless steel pipes is provided at the top of the base plate (1). A moving mechanism for pushing seamless steel pipes for detection is provided above the base plate (1).

2. The seamless steel pipe outer surface unevenness defect detection device according to claim 1, characterized in that: The detection mechanism includes a bracket (2), which is set above the base plate (1). A mounting frame (3) is set above the bracket (2). A sleeve (4) is set on the inner wall of the mounting frame (3). A pressure sensor (5) is set at the bottom of the sleeve (4). A spring (6) is set inside the sleeve (4). One end of the spring (6) is connected to the bottom of the sleeve (4). The end of the spring (6) away from the bottom of the sleeve (4) is connected to a mounting block (7).

3. The seamless steel pipe outer surface unevenness defect detection device according to claim 2, characterized in that: The clamping mechanism includes a contact plate (8), which is disposed at one end of the mounting block (7). The surface of the contact plate (8) is provided with a mounting hole (9), which extends through the contact plate (8) into the interior of the mounting block (7). A bolt (10) is threaded into the interior of the mounting hole (9).

4. The seamless steel pipe outer surface unevenness defect detection device according to claim 3, characterized in that: The placement mechanism includes a support leg (11) which is located on the top of the base plate (1). A placement groove (12) is provided above the support leg (11), and the height of the placement groove (12) is adapted to the contact plate (8).

5. The seamless steel pipe outer surface unevenness defect detection device according to claim 4, characterized in that: The moving mechanism includes a first electric guide rail (13), which is disposed above the base plate (1). A first mounting plate (14) is disposed above the moving end of the first electric guide rail (13). A second electric guide rail (15) is disposed on one side of the first mounting plate (14). A second mounting plate (16) is disposed at the moving end of the second electric guide rail (15). A third electric guide rail (17) is disposed below the second mounting plate (16). A pushing mechanism is disposed at the moving end of the third electric guide rail (17).

6. The seamless steel pipe outer surface unevenness defect detection device according to claim 5, characterized in that: The pushing mechanism includes a servo cylinder (18), which is mounted on the moving end of the third electric guide rail (17), and the output end of the servo cylinder (18) is provided with a push plate (19).

7. The seamless steel pipe outer surface unevenness defect detection device according to claim 6, characterized in that: A controller is provided above the base plate (1), and the controller is electrically connected to the pressure sensor (5), the first electric guide rail (13), the second electric guide rail (15), the third electric guide rail (17) and the servo electric cylinder (18).

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