A kind of pipe resonance bending fatigue testing machine amplitude monitoring protection device

Abstract

The utility model belongs to material fatigue test technical field especially, it is a kind of pipe resonance bending fatigue testing machine amplitude monitoring protection device. Including: base, base support plate, adjustable base support, adjustable fulcrum extension arm, adjustable amplitude extension arm, fulcrum position sensor, amplitude limit sensor. Adjustable base support is connected with the base;Adjustable amplitude extension arm is connected with the adjustable base support;Amplitude limit sensor is set on the adjustable amplitude extension arm;Adjustable fulcrum extension arm is connected with the adjustable base support;Fulcrum position sensor is set on the adjustable fulcrum extension arm;The amplitude limit sensor and fulcrum position sensor are connected with motor control system through circuit, for when detecting that test pipe amplitude is over-limit or fulcrum position is unusual, send stoppage signal to motor control system. The utility model responds quickly, significantly improves test safety and equipment compatibility.

Description

Technical Field

[0001] This utility model belongs to the field of material fatigue testing technology, and in particular to a vibration monitoring and protection device for a pipe resonance bending fatigue testing machine. Background Technology

[0002] In recent years, my country's oil and gas development capabilities have been continuously improving, leading to increasingly complex application environments for pipeline materials. In deep-sea exploration and production, the application of marine risers is indispensable and crucial for offshore oil and gas development, connecting surface production facilities to subsea wellheads. Due to extreme load environments such as vortex-induced vibration and typhoons, and the need for risers to withstand dynamic loads such as waves, currents, and platform movement, repeated bending stress cycles can cause micro-cracks to form and propagate in weak points of the riser string, potentially leading to structural fracture. Therefore, the application of resonant bending fatigue testing machines to test pipe performance, quantify pipe service life, and design pipe strings using test data combined with SN curves has become widely used.

[0003] The resonant bending fatigue testing machine for pipes simulates bending fatigue failure under resonant conditions. It uses a motor to drive an exciter to match the external excitation frequency close to the pipe's natural frequency, amplifying the stress amplitude and accelerating the fatigue damage process. However, as the pipe approaches its natural frequency, there is a risk of fracture or detachment of the fixed support due to excessive amplitude. Therefore, during resonant bending fatigue testing, preventing the pipe's amplitude from exceeding the control range and promptly stopping the machine when the amplitude exceeds the limit are crucial safety measures to ensure the safety of personnel and equipment.

[0004] CN108362586A discloses a resonant bending fatigue testing machine, including a base, a left support, a middle support, a right support, a flexible support mechanism, a clamping mechanism, and an optical vibration displacement monitoring device. The left and right supports have identical structures and are both equipped with a flexible support mechanism, a clamping mechanism, and an optical vibration displacement monitoring device. The middle support is equipped with an optical vibration displacement monitoring device. It relies entirely on optical sensors to control and monitor vibration amplitude, and its accuracy and precision are significantly lower than those for strain.

[0005] CN113514355A discloses a resonant bending fatigue testing machine, which mainly includes a support system, a transmission system, and a monitoring system. The monitoring system of this utility model includes a strain acquisition system and a through-crack monitoring and control system; apart from the strain system, there are no other monitoring and protection devices.

[0006] Current technologies primarily rely on strain monitoring of amplitude, improving reliability by increasing the amount of strain. However, the strain acquisition system and motor control system operate independently, and controlling the motor based on strain feedback data has limitations, increasing control risks under abnormal strain acquisition conditions. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an amplitude monitoring and protection device for a pipe resonance bending fatigue testing machine. Through mechanical-electrical interlocking, it directly sends a stop signal to the motor control system when the amplitude exceeds the limit or the fulcrum position is abnormal, thus solving the problems of low monitoring accuracy, single protection link and delayed response in the prior art.

[0008] The technical solution adopted by this utility model to solve the technical problem is:

[0009] This utility model provides an amplitude monitoring and protection device for a pipe resonance bending fatigue testing machine, comprising: a base, a base support plate, an adjustable base bracket, an adjustable fulcrum extension arm, an adjustable amplitude extension arm, a fulcrum position sensor, and an amplitude limit sensor. The adjustable base bracket is connected to the base; the adjustable amplitude extension arm is connected to the adjustable base bracket via an adjustable amplitude extension arm locking bolt; the amplitude limit sensor is mounted on the adjustable amplitude extension arm; the adjustable fulcrum extension arm is connected to the adjustable base bracket via an adjustable fulcrum extension arm locking bolt; the fulcrum position sensor is mounted on the adjustable fulcrum extension arm; both the amplitude limit sensor and the fulcrum position sensor are connected to a motor control system via wiring, and are used to send a stop signal to the motor control system when the amplitude of the tested pipe exceeds the limit or the fulcrum position is abnormal.

[0010] Furthermore, the adjustable amplitude extension arm and the adjustable fulcrum extension arm are respectively disposed on both sides of the adjustable base bracket.

[0011] Furthermore, the base is fixed to the fatigue testing machine fulcrum device by bolts on the base support plate.

[0012] Furthermore, the adjustable base bracket is connected to the base via a base locking bolt;

[0013] Furthermore, the amplitude limiting sensor and the fulcrum position sensor do not interfere with the test acquisition system and independently output a stop signal to the motor control system.

[0014] Furthermore, the device consists of two sets, which are respectively installed on the two support points of the resonant bending fatigue testing machine.

[0015] Advantages and beneficial effects of this utility model:

[0016] 1. This utility model provides an additional mechanical-electrical interlocking protection device that does not interfere with the existing strain acquisition system, thereby increasing the safety factor of the equipment environment and personnel.

[0017] 2. This utility model has a flexible structure. The axial direction and height can be adjusted by an adjustable base support, an adjustable amplitude extension arm, and an adjustable fulcrum extension arm. The adjustment is convenient and it can be applied to resonance bending fatigue testing machines with different fulcrum structures.

[0018] 3. This utility model monitors the test piece through an amplitude limit sensor and a fulcrum position sensor, without interfering with the test acquisition system. When the position of the test pipe is detected to be out of limit, the motor is directly controlled to stop. Attached Figure Description

[0019] Figure 1 This is the front view of the amplitude monitoring and protection device;

[0020] Figure 2 This is a top view of the amplitude monitoring and protection device;

[0021] Figure 3 Schematic diagram of an adjustable fulcrum extension arm;

[0022] Figure 4 Schematic diagram of adjustable amplitude extension arm;

[0023] Figure 5 This is a schematic diagram showing the layout of the amplitude monitoring and protection device and the location of the resonance bending fatigue testing machine.

[0024] Labels: 1. Base 2. Base support plate 3. Adjustable base bracket 4. Base locking bolt 5. Adjustable amplitude extension arm 6. Adjustable fulcrum extension arm 7. Amplitude limit sensor 8. Fulcrum position sensor 9. Adjustable amplitude extension arm locking bolt 10. Adjustable fulcrum extension arm locking bolt. Detailed Implementation

[0025] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0026] like Figure 1-5 As shown, this utility model is a monitoring device for the amplitude and fulcrum position of a pipe resonant bending fatigue testing machine. The device consists of two sets, each installed on a fulcrum device of one of the two resonant bending fatigue testing machines. This utility model is used to monitor the position of the pipe during the resonant bending test, preventing unexpected situations and enabling timely machine shutdown for protection.

[0027] The technical problem this invention aims to solve is to add a simple, easy-to-install, and position-adjustable amplitude detection and protection device suitable for various pipe material samples under strain monitoring amplitude conditions. The device consists of two sets, each placed under a different support point. The specific position can be adjusted according to different support point configurations and the specifications of the tested pipe material. Each set includes a base 1, a base support plate 2, an adjustable base bracket 3, an adjustable support point extension arm 6, an adjustable amplitude extension arm 5, a support point position sensor 8, and an amplitude limit sensor 7. The base 1 is connected to the fulcrum device of the resonant bending fatigue testing machine, and the base support plate 2 supports the device. The adjustable base bracket 3 is located above the base 1 and can be adjusted in the axial direction of the pipe according to the actual testing conditions. The adjustable fulcrum extension arm 6 is arranged above the base 1 and connected to the adjustable base bracket 3. Its height can be adjusted according to different fulcrum fixing methods and the size of the test pipe. The fulcrum position sensor 8 is fixed above the adjustable fulcrum extension arm 6 and is connected to the motor control system through a circuit. The adjustable amplitude extension arm 5 is connected to the adjustable base bracket 3, and its position can be adjusted according to the maximum amplitude position limited by the test pipe. The amplitude limit sensor 7 is arranged on the adjustable amplitude extension arm 5, forming two sets of mutual position limiting devices. The detection signal position information is connected to the motor control system through a circuit.

[0028] The method of using this device is as follows:

[0029] First, according to different fulcrum forms, install the two sets of this utility model on the base plane of the fulcrum device of the resonant bending fatigue testing machine. If the fulcrum device is inconvenient to install, a flat plate or the like can be added for installation. After the base 1 is stably positioned, tighten the bolts on the four base support plates 2 to fix the base 1 to the fulcrum device of the fatigue testing machine. The adjustable base bracket 3 is placed on the base 1 and connected to the base 1 by the base locking bolt 4. The adjustable amplitude extension arm 5 is connected to the adjustable base bracket 3 by the adjustable amplitude extension arm locking bolt 9, and the amplitude limit sensor 7 is placed on the adjustable amplitude extension arm 5. The adjustable fulcrum extension arm 6 is connected to the adjustable base bracket 3 on the opposite side of the adjustable amplitude extension arm 5 by the adjustable fulcrum extension arm locking bolt 10, and the fulcrum position sensor 8 is placed on the adjustable fulcrum extension arm 6.

[0030] After the test pipe is installed, adjust the front and rear positions of the adjustable base bracket 3 according to the fulcrum position to make the fulcrum position sensor 8 as close as possible to the fulcrum of the test pipe. After the position adjustment is completed, tighten the base locking bolt 4 to fix the adjustable base bracket 3. Adjust the height position of the adjustable fulcrum extension arm 6 according to the outer diameter and position of the test pipe, fix the fulcrum position sensor 8 on the adjustable fulcrum extension arm 6, and tighten the adjustable fulcrum extension arm locking bolt 10 to fix the adjustable fulcrum extension arm 6. Adjust the height of the adjustable amplitude extension arm 5 according to the maximum amplitude of the pipe in the test plan so that the amplitude detected by the amplitude limit sensor 7 is greater than the maximum test amplitude and within a suitable range. Fix the amplitude limit sensor 7 on the adjustable amplitude extension arm 5, and tighten the adjustable amplitude extension arm locking bolt 9 to fix the adjustable amplitude extension arm 5. The amplitude limit sensor 7 and the fulcrum position sensor 8 are connected to the motor control system through wiring.

[0031] During the test, when the amplitude of the test pipe exceeds the limit, the position signal is detected by the amplitude limit sensor 7, and the signal is fed back to the motor control system. The motor stops and displays an over-limit alarm message. During the test, the fulcrum position should be basically fixed. When the fulcrum locking is abnormal or the fulcrum device malfunctions, the test pipe will shift at the fulcrum position. The position signal is detected by the fulcrum position sensor 8, and the signal is fed back to the motor control system. The motor stops and displays a fulcrum position alarm message.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A vibration monitoring and protection device for a pipe resonance bending fatigue testing machine, characterized in that, include: Base (1); An adjustable base bracket (3) is connected to the base (1); An adjustable amplitude extension arm (5) is connected to the adjustable base bracket (3) via an adjustable amplitude extension arm locking bolt (9); An amplitude limiting sensor (7) is mounted on the adjustable amplitude extension arm (5); The adjustable fulcrum extension arm (6) is connected to the adjustable base bracket (3) via the adjustable fulcrum extension arm locking bolt (10); A fulcrum position sensor (8) is mounted on the adjustable fulcrum extension arm (6); The amplitude limit sensor (7) and the fulcrum position sensor (8) are both connected to the motor control system via lines, and are used to send a stop signal to the motor control system when the amplitude of the test pipe exceeds the limit or the fulcrum position is abnormal.

2. The amplitude monitoring and protection device for the pipe resonance bending fatigue testing machine according to claim 1, characterized in that, The adjustable amplitude extension arm (5) and the adjustable fulcrum extension arm (6) are respectively located on both sides of the adjustable base bracket (3).

3. The vibration monitoring and protection device for the pipe resonance bending fatigue testing machine according to claim 1, characterized in that: The base (1) is fixed to the fatigue testing machine support device by bolts on the base support plate (2).

4. The amplitude monitoring and protection device for the pipe resonance bending fatigue testing machine according to claim 1, characterized in that, The adjustable base bracket (3) is connected to the base (1) via a base locking bolt (4).

5. The amplitude monitoring and protection device for the pipe resonance bending fatigue testing machine according to claim 1, characterized in that, The amplitude limiting sensor (7) and the fulcrum position sensor (8) do not interfere with each other and independently output a stop signal to the motor control system.

6. The amplitude monitoring and protection device for the pipe resonance bending fatigue testing machine according to claim 1, characterized in that, The device consists of two sets, which are respectively installed on the two support points of the resonant bending fatigue testing machine.

Images