Digital rebound hammer automatic positioning detection mechanism integrated with distance sensor

Abstract

The present application relates to the technical field of digital rebound hammer, and discloses an automatic positioning detection mechanism of digital rebound hammer integrated with distance sensor, which comprises an outer shell, a rebounding rod is arranged on the outer shell in a sliding mode, a plurality of through openings are formed on the surface of the outer shell, the through openings are distributed in a circumferential array around the axis of the rebounding rod, a fixed cover is fixedly sleeved on the surface of the outer shell, a plurality of notches are formed on the fixed cover, the notches are distributed in a circumferential array around the axis of the rebounding rod, and each notch is opposite to a through opening, two damping strips are fixed in each notch, a detection assembly is arranged in the outer shell, a feedback assembly is arranged on the outer shell, and the feedback assembly comprises a plurality of feedback structures. The present application utilizes the lever amplification principle of the movable rod and feedback plate to visually display the slight deviation, so that the operator can quickly identify the deviation direction and degree, correct the posture in time, and avoid the problem that the detection data is inaccurate and has large discreteness due to the inclination of the rebounding rod.

Description

Technical Field

[0001] This invention relates to the field of digital rebound hammer technology, and in particular to an automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor. Background Technology

[0002] A digital rebound hammer is a non-destructive testing instrument for concrete based on the rebound method principle and incorporating built-in electronic sensors and data processing modules. It is used to quickly and accurately determine the surface hardness of concrete and convert it into compressive strength. The instrument impacts the concrete surface through a mechanical impact structure, and uses a distance sensor to collect the rebound value in real time. The built-in chip automatically calculates, corrects, and directly displays the compressive strength, eliminating the need for manual table lookup. It features high testing accuracy, convenient operation, and data storage and export capabilities, and is widely used in the quality testing and acceptance of concrete in building engineering.

[0003] During the use of a digital rebound hammer, the movable impact rod relies on the sliding fit of components such as the guide sleeve and the limiting ring. Long-term, high-frequency reciprocating impacts cause gradual wear between the outer circumference of the impact rod and the inner hole of the guide sleeve. The originally designed small fit clearance continuously widens, making it impossible for the impact rod to remain centered during extension and retraction, naturally resulting in radial sway. Simultaneously, the impact rod head, constantly impacting concrete, is prone to wear, dents, or micro-deformation. Uneven force distribution exacerbates the sway. Repeated stretching fatigue deformation of the impact spring, and loosening or wear of the limiting ring or retaining ring, also weaken the radial constraint on the impact rod, further releasing... Large vibrations cause the force direction and rebound trajectory of each impact to deviate, making it impossible to guarantee a vertical rebound. This results in inaccurate rebound value acquisition, large data dispersion, and serious deviations in the calculated concrete compressive strength, making it difficult to accurately reflect the actual strength of the component. Consequently, the test data becomes unreliable, and the engineering quality is misjudged. Vibration also causes instability in the contact position between the impact rod and the guide sleeve and sensor, making it impossible for the distance sensor to accurately capture the rebound displacement signal. This leads to frequent data jumps, garbled characters, or abnormal readings, and may even damage the sensor, affecting the normal operation of the instrument.

[0004] Therefore, it is necessary to design an automatic positioning and detection mechanism for a digital rebound hammer that integrates a distance sensor to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic positioning and detection mechanism for a digital rebounder that integrates a distance sensor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic positioning and detection mechanism for a digital rebound hammer with integrated distance sensor includes a housing, on which a striking rod is slidably disposed. The surface of the housing has several openings arranged in a circumferential array around the axis of the striking rod. A fixing cover is fixedly fitted onto the surface of the housing, and the fixing cover has several notches arranged in a circumferential array around the axis of the striking rod, each notch facing one of the openings. Two damping strips are fixed within each notch. A detection component is disposed inside the housing, and a feedback component is disposed on the housing, the feedback component including several feedback structures.

[0007] As a preferred embodiment of the present invention, the detection assembly includes a plurality of movable rods, which are slidably disposed in a plurality of openings. One end of each movable rod is located inside the outer casing, and the other end of each movable rod is located outside the outer casing. A rotatable ball is provided at the end of each movable rod located inside the outer casing. The ball is in contact with the surface of the spring rod. Two protrusions are fixed on each movable rod. Each movable rod is connected to the inner wall of the outer casing by a spring.

[0008] As a preferred embodiment of the present invention, a plurality of the movable rods are arranged in a circumferential array around the axis of the striking rod.

[0009] As a preferred embodiment of the present invention, each feedback structure includes two supports, both of which are fixed to the surface of the outer shell, and a shaft is rotatably mounted between the two supports, with a feedback plate fixedly sleeved on the shaft.

[0010] As a preferred embodiment of the present invention, the feedback plates are respectively positioned opposite the movable rods.

[0011] As a preferred embodiment of the present invention, the damping strip is made of rubber material and has anti-slip texture on its surface. The feedback plates are respectively located in the notches, and each feedback plate is attached to two damping strips in the corresponding notch.

[0012] As a preferred embodiment of the present invention, the observation cover is made of a transparent material.

[0013] As a preferred embodiment of the present invention, the outer shell is provided with a positioning component, the positioning component including a plurality of positioning structures, and the plurality of positioning structures are respectively positioned opposite to a plurality of feedback plates.

[0014] As a preferred embodiment of the present invention, the positioning structure includes two arc-shaped plates, one end of each arc-shaped plate being connected to the observation cover, and the other end of each arc-shaped plate being connected to the surface of the outer shell. Scale lines are provided on the opposite sides of each arc-shaped plate.

[0015] The present invention has the following beneficial effects: This digital rebound hammer automatic positioning and detection mechanism, integrating a distance sensor, can monitor the offset of the impact rod in real time and from all directions. Through ball contact and spring constraint, it can effectively suppress the shaking of the impact rod, reduce wear, and improve motion stability. Utilizing the lever amplification principle of the movable rod and feedback plate, it can intuitively visualize minute offsets, allowing operators to quickly identify the direction and degree of offset and correct the posture in time. This avoids problems such as inaccurate detection data and large dispersion caused by the tilt of the impact rod. The fixed cover, damping strip, and transparent observation cover work together to ensure the stable positioning of the feedback plate, prevent accidental movement, and provide dust protection, extending the service life of the instrument. The arc-shaped scale positioning structure further improves the accuracy of offset judgment. The overall structure is compact, the linkage is sensitive, and the operation is convenient, significantly improving the detection accuracy, repeatability, and reliability of the digital rebound hammer, reducing the risk of construction misjudgment, and adapting to various complex working environments on construction sites. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor proposed in this invention; Figure 2 This is a cross-sectional structural schematic diagram of an automatic positioning and detection mechanism for a digital rebounder with an integrated distance sensor proposed in this invention. Figure 3 This is a schematic diagram of the structure when the observation cover is not shown; Figure 4 This is a structural diagram of the positioning structure; Figure 5 This is a schematic diagram of the structure of the fixed cover; Figure 6 This is a schematic diagram of the detection component.

[0017] In the diagram: 1. Outer shell; 2. Strike rod; 3. Fixed cover; 31. Notch; 32. Damping strip; 4. Observation cover; 51. Movable rod; 52. Protrusion; 53. Ball bearing; 54. Spring; 61. Bracket; 62. Shaft; 63. Feedback plate; 71. Arc plate; 72. Scale line. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example 1: This example discloses an automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor. (Refer to...) Figure 1-6 The instrument includes an outer casing 1, on which an impact rod 2 is slidably mounted. The outer casing 1 contains a spring 54, an impact hammer, and a distance sensor. During testing, the instrument's impact rod 2 is held vertically against the concrete surface. Pressing the instrument compresses the internal spring 54 to store energy. Once in position, the spring 54 locks and disengages, releasing its kinetic energy and driving the impact hammer to strike the impact rod 2 at high speed. This causes the impact rod 2 to impact the concrete surface. The concrete rebounds elastically after the impact, pushing the impact rod 2 and the impact hammer back. The distance sensor inside the instrument captures the rebound displacement in real time, converting the mechanical rebound signal into an electrical signal and transmitting it to the built-in microprocessor. The chip automatically completes data processing and environmental parameter correction according to a preset conversion formula, directly calculating and displaying the concrete compressive strength value.

[0020] The outer shell 1 has several openings on its surface, which are arranged in a circumferential array around the axis of the impact rod 2. The edges of the openings are smoothly polished. A fixing cover 3 is fixedly fitted onto the surface of the outer shell 1. The fixing cover 3 is made of rigid plastic and is integrally molded. It is structurally stable and not easily deformed. It is detachably connected to the outer shell 1 by fastening bolts, which facilitates later inspection and maintenance. The fixing cover 3 has several notches 31, which are arranged in a circumferential array around the axis of the impact rod 2. The notches 31 are respectively set opposite to the openings. Two damping strips 32 are fixed in each notch 31. The damping strips 32 are made of rubber material and have anti-slip texture on the surface.

[0021] An observation cover 4 is fixedly fitted onto the surface of the outer casing 1. The observation cover 4 is connected to the fixed cover 3, and the connection is sealed with sealant to prevent dust and moisture from seeping in. The observation cover 4 is made of transparent material, such as transparent PVC material, which has good light transmittance, high hardness, scratch resistance and wear resistance, and can clearly observe the status of the internal feedback board 63. At the same time, it has a certain impact resistance to avoid damage from bumps.

[0022] An internal detection assembly is installed in the outer casing 1 to detect the deflection of the impact lever 2. The detection assembly includes several movable levers 51, which are slidably disposed in several openings. The movable levers 51 are made of lightweight metal, possessing high strength and light weight with low sliding resistance. One end of each movable lever 51 is located inside the outer casing 1, and the other end is located outside the outer casing 1. Each movable lever 51 has a rotatable ball 53 at its internal end. The ball 53 is made of wear-resistant steel, allowing for flexible rotation and a low coefficient of friction. All the ball 53... The contact points are evenly distributed and in contact with the surface of the striking rod 2 to ensure sensitive offset sensing. Each movable rod 51 has two fixed protrusions 52, symmetrically arranged, which limit the sliding stroke of the movable rod 51 and prevent it from falling off. Each movable rod 51 is connected to the inner wall of the outer casing 1 via a spring 54. The spring 54 is made of high-elasticity stainless steel, with stable elasticity and fatigue resistance. Under the elastic force of the spring 54, the balls 53 on the movable rod 51 tend to resist the striking rod 2, maintaining close contact. Several movable rods 51 are arranged in a circumferential array around the axis of the striking rod 2, forming a... Figure 6 The state shown.

[0023] A feedback component is provided on the outer casing 1. As the core of visual feedback, the feedback component can magnify and display the slight offset of the impact lever 2, making it easy for staff to judge intuitively. The feedback component includes several feedback structures, each of which includes two brackets 61. The brackets 61 are made of metal and are fixed to the surface of the outer casing 1. The connection is firm and not easy to loosen. A shaft 62 is rotatably installed between the two brackets 61. A feedback plate 63 is fixedly sleeved on the shaft 62. The feedback plate 63 is made of lightweight rigid plate with high strength and good toughness. The intersection of the shaft 62 and the feedback plate 63 is close to the end of the feedback plate 63. According to the lever principle, when one end of the feedback plate 63 is lifted, the feedback plate 63 rotates around the shaft 62. This causes the other end of the feedback plate 63 to rotate as well. The rotation stroke of the driven end of the feedback plate 63 is greater than the rotation stroke of the active end of the feedback plate 63, which plays a role in stroke amplification. It can magnify the slight offset of the impact and make it easy to identify with the naked eye. One end of the feedback plate 63 is set directly opposite the movable rod 51.

[0024] In normal use, the digital rebound device proposed in this invention maintains the vertical center of the impact lever 2 without any deviation. Under these conditions, the impact lever 2 does not exert lateral thrust on the movable lever 51 during sliding, and the movable lever 51 remains in its initial position without displacement. The ball bearing 53 only slides axially with the impact lever 2 and does not exert radial force on the movable lever 51. The ball bearing 53 reduces the friction between the movable lever 51 and the impact lever 2, reducing component wear and extending service life. This reduces wear between the two components, maintaining sensitivity even after long-term use. When the impact lever 2 deviates, it is often due to tilting the grip. Impact, shaking, or component wear can cause the movable rod 51 in the offset direction to be laterally squeezed during sliding. This causes the movable rod 51 at the corresponding position to move against the elastic force of the spring 54. The displacement is proportional to the degree of offset. The moved movable rod 51 will simultaneously push up the corresponding feedback plate 63, causing the feedback plate 63 to deflect around the shaft 62. The deflection angle directly reflects the magnitude of the offset. Therefore, the staff can directly observe the position changes of several feedback plates 63 on the outer shell 1 through the observation cover 4, quickly determine the offset of the spring rod 2, accurately identify the offset direction, and adjust the grip posture in time to ensure accurate detection.

[0025] Meanwhile, under the synergistic effect of the elastic force of several springs 54, several movable rods 51 together form a circumferential elastic constraint on the impact rod 2 through the ball bearings 53, which can effectively suppress the swaying tendency of the impact rod 2, reduce the degree of deviation, ensure that the impact rod 2 slides stably in the axial direction, maintain working stability, and avoid deviation of detection data due to deviation.

[0026] Several feedback plates 63 are located in several notches 31. Each feedback plate 63 is attached to two damping strips 32 in the corresponding notch 31. The damping strips 32 symmetrically clamp the two sides of the feedback plate 63, and the contact is uniform. The two damping strips 32 can increase the friction between the feedback plate 63 and the notch 31, forming a damping limit. This friction can play a stable constraint role on the feedback plate 63. Only when the movable rod 51 applies sufficient thrust will the feedback plate 63 overcome the friction and rotate. In other cases, the feedback plate 63 remains fixed and will not deflect erroneously due to vibration or shaking, thus improving the accuracy of feedback. In addition, the observation cover 4 made of transparent material not only has good light transmission and a clear field of vision, making it convenient for staff to directly observe the deflection angle and position of the feedback plate 63, but also effectively isolates dust, debris and water vapor at the construction site, preventing impurities from entering the inner shell 1 and contaminating precision components such as sensors and springs 54, thus playing a good protective role for the device and extending the service life of the instrument.

[0027] Example 2: Based on Example 1, this example discloses an automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor, such as... Figure 4As shown, in order to further improve the accuracy of offset judgment and optimize the visual feedback effect, a positioning component is set on the outer shell 1. The positioning component corresponds one-to-one with the feedback component and works together. The positioning component includes several positioning structures, which are respectively set facing several feedback plates 63. The setting of the positioning component allows the staff to know the angle change of the feedback plate 63 more intuitively and accurately. Without estimation, the offset of the striking rod 2 can be judged by directly reading the scale, thereby accurately judging the offset of the striking rod 2 and greatly improving the positioning accuracy and operation convenience.

[0028] Specifically, the positioning structure includes two arc-shaped plates 71. The arc-shaped plates 71 are made of hard, transparent plastic, which is not easily deformed and has clear and wear-resistant scales. The two arc-shaped plates 71 are symmetrically arranged, with one end of each arc-shaped plate 71 fixedly connected to the edge of the observation cover 4, ensuring a stable connection. The other end of each arc-shaped plate 71 is fixedly connected to the surface of the outer shell 1. Scale lines 72 are provided on the opposite sides of each arc-shaped plate 71. The scale lines 72 are evenly distributed, clearly marked, and cover the normal to maximum offset range. The feedback plate 63 is located between the two arc-shaped plates 71, pointing to the corresponding scale. The operator can directly refer to the scale lines 72 on the two arc-shaped plates 71 to accurately read the rotation angle of the feedback plate 63, quickly calculate the offset of the impact rod 2, and achieve precise positioning. This provides intuitive data support for timely adjustment of the instrument's posture, ensuring that the impact rod 2 remains vertical during each test, and guaranteeing accurate and reliable test data.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor, characterized in that, The device includes an outer shell (1), on which a striking rod (2) is slidably disposed. The surface of the outer shell (1) has several openings, which are arranged in a circumferential array around the axis of the striking rod (2). A fixing cover (3) is fixedly fitted on the surface of the outer shell (1). The fixing cover (3) has several notches (31), which are arranged in a circumferential array around the axis of the striking rod (2). The notches (31) are respectively positioned opposite the openings. Two damping strips (32) are fixed inside each notch (31). A detection component is disposed inside the outer shell (1). A feedback component is disposed on the outer shell (1), which includes several feedback structures.

2. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 1, characterized in that, The detection assembly includes several movable rods (51), which are slidably disposed in several openings. One end of each movable rod (51) is located inside the outer shell (1), and the other end of each movable rod (51) is located outside the outer shell (1). Each movable rod (51) has a rotatable ball (53) at the end inside the outer shell (1). The ball (53) is in contact with the surface of the spring rod (2). Each movable rod (51) has two protrusions (52) fixed on it. Each movable rod (51) is connected to the inner wall of the outer shell (1) by a spring (54).

3. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 2, characterized in that, Several of the movable rods (51) are arranged in a circumferential array around the axis of the striking rod (2).

4. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 2, characterized in that, Each of the feedback structures includes two brackets (61), both brackets (61) are fixed to the surface of the outer shell (1), and a shaft (62) is rotatably mounted between the two brackets (61), and a feedback plate (63) is fixedly sleeved on the shaft (62).

5. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 4, characterized in that, Several of the aforementioned feedback plates (63) are respectively positioned opposite several movable rods (51).

6. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 4, characterized in that, The damping strip (32) is made of rubber material and has anti-slip texture on its surface. Several feedback plates (63) are located in several notches (31), and each feedback plate (63) is attached to two damping strips (32) in the corresponding notch (31).

7. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 1, characterized in that, The observation cover (4) is made of transparent material.

8. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 4, characterized in that, The outer shell (1) is provided with a positioning component, which includes several positioning structures, and the several positioning structures are respectively positioned opposite several feedback plates (63).

9. The automatic positioning and detection mechanism for a digital rebound hammer with an integrated distance sensor according to claim 8, characterized in that, The positioning structure includes two arc-shaped plates (71), one end of each arc-shaped plate (71) is connected to the observation cover (4), and the other end of each arc-shaped plate (71) is connected to the surface of the outer shell (1). Scale lines (72) are provided on the opposite sides of each arc-shaped plate (71).

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