An equivalent crash stiffness catapult for near wall damage detection
By designing an equivalent collision stiffness catapult, the collision stiffness is measured by the collision between the hammer and the structural surface, which solves the problems of accuracy and speed in detecting near-wall damage in the existing technology, and realizes rapid and accurate damage detection.
Patent Information
- Application Number
- CN202011207880.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-10-30
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2040-10-30
AI Technical Summary
Existing methods for detecting voids are greatly affected by the environment and cannot accurately and quickly detect near-wall damage inside structures, especially voids between steel-concrete composites and steel pipe walls, voids in composite materials, near-wall voids in concrete structures, and concrete cracks.
Design an equivalent impact stiffness catapult that uses a hammer to collide with a structural surface, measures the impact force and acceleration using force and acceleration sensors, calculates the impact stiffness of the structural surface, and determines near-wall damage.
It enables rapid and accurate near-wall damage detection, with precise and reliable results that are unaffected by ambient temperature and noise, and is suitable for civil engineering and structural health monitoring.
Smart Images
Figure CN112255123B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to an equivalent impact stiffness ejector for near-wall damage detection. The application fields include: civil engineering and structural health detection. Specifically, it includes concrete material strength detection, near-wall void damage detection based on equivalent impact stiffness, and the like. The damage types include concrete and steel tube wall void detection inside the steel tube concrete, composite material void detection, concrete structure near-wall hole detection, concrete crack detection, and the like. BACKGROUND
[0002] Modern structures tend to be complex and various materials are used in combination. The interfaces between materials are prone to void and damage. However, since the connecting interfaces are often located inside the structure, they cannot be directly detected, and therefore, the research on the connecting interface damage monitoring has attracted more and more attention.
[0003] The existing void detection methods mainly include:
[0004] (1) Non-destructive detection based on ultrasonic method: an ultrasonic probe is attached to the surface, and the reflected echo signal is detected;
[0005] (2) Detection based on infrared method: an infrared detector is used to detect the temperature change inside the structure, and the internal temperature distribution is used to determine whether there is a void or other damage inside the structure;
[0006] (3) Detection based on knocking sound method: a handheld or other mechanical knocking sound is used to reflect the internal damage state of the structure.
[0007] In the above methods, the ultrasonic method needs to attach a probe to the surface of the structure, and the reflected echo signal is greatly affected by the attached surface. The infrared method is limited by the ambient temperature and cannot well reflect the damage state of the structure, and cannot measure the impact stiffness of the structure. The knocking sound method is greatly affected by the environment, and the environmental noise level directly affects the detection effect.
[0008] Therefore, for the various detection methods, they are constrained by various detection conditions and cannot be widely applied. In order to overcome the above shortcomings, the present application provides a convenient, effective and fast near-wall damage detection device. CONTENT OF THE INVENTION
[0009] The present application is designed for the void between the concrete inside the steel tube concrete and the steel tube wall, the void of the composite material, the hole near the wall of the concrete structure, the crack of the concrete, and the like. The equivalent impact stiffness ejector for near-wall damage detection can flexibly, quickly and accurately judge the surface properties of the structure and whether the structure has a void damage. The application fields include: civil engineering and structural health detection.
[0010] The technical scheme of the present application is an equivalent collision stiffness ejector for near-wall damage detection, which is mainly composed of a hammer head, an outer shell, a force sensor, a transmission hammer base, an acceleration sensor, a transmission hammer base left lever, a transmission hammer base middle through hole, a transmission hammer base right lever, an outer shell lever slide, an outer shell center upper circular baffle, a transmission hammer base upper pressure disc, a spring, an outer shell center lower circular baffle, a transmission hammer base lower pressure disc, an electric suction disc and an outer shell bottom through hole. It should be noted that, when designing the surface collision stiffness ejection measurement device, the distance between the transmission hammer base lower pressure disc and the electric suction disc in the free state should be less than the distance between the transmission hammer base upper pressure disc and the outer shell center upper circular baffle, so that the hammer head can be ejected out of the outer shell and collide with the measured structure.
[0011] The equivalent collision stiffness ejector for near-wall damage detection is characterized in that the hammer head and the transmission hammer base are detachable, and the hammer head can be replaced with a hammer head made of different materials, such as nylon, rubber, aluminum, steel and marble, according to the hardness of the material.
[0012] The equivalent collision stiffness ejector for near-wall damage detection is characterized in that the transmission hammer base has two sensor chambers for placing the force sensor and the acceleration sensor.
[0013] The equivalent collision stiffness ejector for near-wall damage detection is characterized in that the transmission hammer base center has a transmission hammer base middle through hole, which is used to lead the wires of the force sensor and the acceleration sensor out for data transmission.
[0014] The equivalent collision stiffness ejector for near-wall damage detection is characterized in that the transmission hammer base has a transmission hammer base upper pressure disc and a transmission hammer base lower pressure disc, the transmission hammer base upper pressure disc is used to compress the spring, and the transmission hammer base lower pressure disc can be adsorbed by the electric suction disc.
[0015] The equivalent collision stiffness ejector for near-wall damage detection is characterized in that the transmission hammer base has a transmission hammer base left lever and a transmission hammer base right lever on both sides, the levers are used to be pulled by hand to drive the transmission hammer base upper pressure disc to move downward to compress the spring, and the transmission hammer base lower pressure disc can be adsorbed and fixed by the electric suction disc.
[0016] The equivalent collision stiffness ejector for near-wall damage detection is characterized in that the outer shell has guide rail slides on both sides, which can make the transmission hammer base left lever and the transmission hammer base right lever move up and down.
[0017] The equivalent collision stiffness ejector for near-wall damage detection has the features that the inside of the shell has an upper center circular baffle and a lower center circular baffle, the opening is used to enable the transmission rod of the transmission hammer base to move up and down, the upper center circular baffle is used to limit the upward movement of the upper compression disc of the transmission hammer base, and the lower center circular baffle is used to limit the downward sliding of the spring in the compressed state.
[0018] The equivalent collision stiffness ejector for near-wall damage detection has the feature that the shell has a shell bottom through hole, which is used to lead the wires of the sensor out for data transmission.
[0019] The equivalent collision stiffness ejector for near-wall damage detection has the feature that it is a device for measuring the collision stiffness of the surface of a structure through the collision of a hammer head and the structure, relies on a force sensor to output collision force, an acceleration sensor to output acceleration, and corresponding calculation of the collision stiffness of the surface of the structure through the force and acceleration signal output, so as to obtain the collision stiffness of the surface of the structure, and judge the near-wall damage (voiding, delamination, etc.) of the structure.
[0020] The equivalent collision stiffness ejector overcomes the inherent shortcomings of traditional detection technology and has the following beneficial effects:
[0021] The corresponding calculation of the collision stiffness of the surface of the structure through the force and acceleration signal output, so as to obtain the collision stiffness of the surface of the structure, is a quantitative measurement method, and the result is accurate and reliable.
[0022] The detection device is not limited by the environment temperature;
[0023] The detection method is convenient and fast, and is a rapid detection device. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is a sectional view of the equivalent collision stiffness ejector of the patent;
[0025] Figure 2 It is an external overall plan view of the equivalent collision stiffness ejector of the patent;
[0026] Figure 3 It is an external overall bottom view of the equivalent collision stiffness ejector of the patent;
[0027] Figure 4 It is an internal transmission hammer base of the equivalent collision stiffness ejector of the patent;
[0028] Figure 5 It is a measurement and collection system schematic diagram.
[0029] In the attached Figure 1 ~ attached Figure 5In the diagram, 1 is the hammer head, 2 is the outer shell, 3 is the force sensor, 4 is the transmission hammer base, 5 is the acceleration sensor, 6 is the left lever of the transmission hammer base, 7 is the through hole in the transmission hammer base, 8 is the right lever of the transmission hammer base, 9 is the slide rail of the outer shell lever, 10 is the upper circular baffle in the center of the outer shell, 11 is the upper pressure plate of the transmission hammer base, 12 is the spring, 13 is the lower circular baffle in the center of the outer shell, 14 is the lower pressure plate of the transmission hammer base, 15 is the electric suction cup, and 16 is the through hole at the bottom of the outer shell. Detailed Implementation
[0030] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.
[0031] like Figures 1-5 As shown, this invention proposes a surface impact stiffness ejection measurement device, which consists of a hammer head 1, a housing 2, a force sensor 3, a transmission hammer base 4, an acceleration sensor 5, a left lever 6 of the transmission hammer base, a central through hole 7 of the transmission hammer base, a right lever 8 of the transmission hammer base, a lever slide rail 9 of the housing, an upper circular baffle 10 at the center of the housing, an upper pressure plate 11 of the transmission hammer base, a spring 12, a lower circular baffle 13 at the center of the housing, a lower pressure plate 14 of the transmission hammer base, an electric suction cup 15, and a bottom through hole 16 of the housing. The electric suction cup 15 is connected to an external switch, allowing for the release and suction of the hammer head 1. The wires of the force sensor 3 and the acceleration sensor 5 pass through the central through hole 7 of the transmission hammer base and the wires of the electric suction cup 15, and then through the bottom through hole 16 of the housing, connecting to an external data acquisition device and a personal computer (PC). Figure 5 As shown.
[0032] The hammer head 1 and the transmission hammer seat 4 can be tightened in two parts by internal thread. The pressure plate 14 at the bottom of the transmission hammer seat should be made of magnetically adsorbable iron so that the electric suction cup 15 can be adsorbed.
[0033] When designing and inventing a surface impact stiffness ejection measurement device, the free state distance between the lower pressure plate 14 of the transmission hammer base and the electric suction cup 15 should be less than the distance between the upper pressure plate 11 of the transmission hammer base and the upper circular baffle 10 of the outer shell center. The purpose is to allow the hammer head 1 to eject from the outer shell 2 and collide with the structure being measured.
[0034] Before measurement, pull down the left lever 6 of the transmission hammer holder to move the entire transmission hammer holder 4 downwards, so that the lower pressure plate 14 of the transmission hammer holder moves to the electric suction cup 15 and comes into contact with it. At this time, the elastic force generated by the compression spring 12 should be less than the suction force of the electric suction cup 15 on the lower pressure plate 14 of the transmission hammer holder. During measurement, the power supply to the electric suction cup 15 must be cut off, so that the suction force between the electric suction cup 15 and the lower pressure plate 14 of the transmission hammer holder disappears, the spring 12 begins to recover its deformation, and the transmission hammer holder 4 drives the hammer head 1 to move outwards, so that the hammer head 1 collides with the structure being measured, generating instantaneous collision force and collision acceleration.
[0035] In an embodiment, the force and acceleration signals generated by the force sensor 3 and the acceleration sensor 5 need to be connected to an external acquisition card for signal acquisition and analysis, so as to make a damage judgment.
[0036] In an embodiment, the hammer head 1 and the transmission hammer seat 4 are detachable, and the hammer head can be replaced with a hammer head made of different materials according to different material hardness, such as nylon, rubber, aluminum, steel, marble and other materials with different hardness.
Claims
1. An equivalent crash stiffness catapult for near-wall damage detection, characterized by: Mainly by hammer head (1), shell (2), force sensor (3), transmission hammer seat (4), acceleration sensor (5), transmission hammer seat left lever (6), transmission hammer seat middle hole (7), transmission hammer seat right lever (8), shell lever slide (9), shell center upper circular baffle (10), transmission hammer seat upper pressure plate (11), spring (12), shell center lower circular baffle (13), transmission hammer seat lower pressure plate (14), electric suction disc (15), shell bottom hole (16) is composed of; Transmission hammer seat (4) has two sensor rooms for placing force sensor (3) and acceleration sensor (5); Transmission hammer seat (4) has transmission hammer seat middle hole (7) in the center, which is used to lead out the wires of force sensor (3) and acceleration sensor (5) for data transmission; The collision stiffness of the structure surface is measured by the collision of the hammer head and the structure. The collision force is output by the force sensor (3), and the acceleration is output by the acceleration sensor (5). The corresponding calculation of the structure surface collision stiffness is carried out through the force and acceleration signal output, and then the structure surface collision stiffness is obtained, which is used to judge the near wall damage of the structure.
2. The equivalent crash stiffness catapult of claim 1, wherein: The hammer head (1) and the transmission hammer seat (4) are directly detachable. The hammer head can be replaced with different materials such as nylon, rubber, aluminum, steel, marble and other materials with different hardness.
3. The equivalent crash stiffness catapult of claim 1, wherein: Transmission hammer seat (4) has two metal pressure plates, transmission hammer seat upper pressure plate (11) and transmission hammer seat lower pressure plate (14). The purpose of transmission hammer seat upper pressure plate (11) is to compress spring (12), and the purpose of transmission hammer seat lower pressure plate (14) is to be adsorbed by electric suction disc (15).
4. The equivalent crash stiffness catapult of claim 1, wherein: Transmission hammer seat (4) has transmission hammer seat left lever (6) and transmission hammer seat right lever (8) on both sides. The purpose of setting the lever is to pull the lever with hand to drive transmission hammer seat upper pressure plate (11) to move downward to compress spring (12), and at the same time make transmission hammer seat lower pressure plate (14) be adsorbed and fixed by electric suction disc (15).
5. The equivalent crash stiffness catapult of claim 1, wherein: Shell (2) has guide rail slide (9) on both sides, which can make transmission hammer seat left lever (6) and transmission hammer seat right lever (8) move up and down.
6. The equivalent crash stiffness catapult of claim 1, wherein: Shell (2) has shell center upper circular baffle (10) and shell center lower circular baffle (13) inside. The purpose of the hole is to make the transmission lever of transmission hammer seat (4) move up and down. The purpose of shell center upper circular baffle (10) is to limit the upward movement of transmission hammer seat upper pressure plate (11), and the purpose of shell center lower circular baffle (13) is to limit the downward sliding of spring (12) in the compressed state.
7. The equivalent crash stiffness catapult of claim 1, wherein: Shell (2) has a shell bottom hole (16), which is used to lead out the wires of the sensor for data transmission.
Citation Information
Patent Citations
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