A rebound detection system and method special for high-strength concrete

Abstract

The present application relates to the technical field of rebound hammer, and particularly relates to a rebound detection system and method special for high-strength concrete, which comprises a rebound hammer main body, a rebound component, a displacement sensing unit, a voice recognition module, a communication module, a touch screen module and a control unit. The rebound component is arranged inside the rebound hammer main body and comprises a central guide rod, an impact hammer, an energy storage spring and a rebound rod, the rebound rod is slidably sleeved on the outside of the front end of the central guide rod; the displacement sensing unit comprises a laser ranging sensor, a guide slide rail and a movable seat, the movable seat is fixed with a light reflecting sheet and a hit bullet, the impact hammer hits the hit bullet to drive the movable seat to slide when rebounding, and the laser ranging sensor generates a rebound value signal by detecting the displacement of the movable seat; the voice recognition module is used for collecting and recognizing the position description information of the measuring point, and the communication module uploads the data to a remote server. The present application combines laser ranging and voice interaction, and realizes the intelligence and high precision of high-strength concrete detection.

Description

Technical Field

[0001] This invention relates to the field of rebound hammer technology, and in particular to a rebound testing system and method specifically for high-strength concrete. Background Technology

[0002] Concrete structural strength is one of the key indicators for ensuring the quality of building construction. The rebound hammer test, due to its simple instrument construction, convenient operation, and low testing cost, has become the main non-destructive testing method for determining the strength of concrete structures. With the increasing number of high-rise buildings and large-scale infrastructure projects in my country, the application of high-strength concrete is becoming more and more widespread. To this end, the Ministry of Housing and Urban-Rural Development of China issued the "Technical Specification for Strength Testing of High-Strength Concrete" (JGJ / T294-2013), and the State Administration for Quality Supervision, Inspection and Quarantine of China issued the "Verification Specification for Rebound Hammers" (JJG817-2011), which set forth clear requirements for the instrument performance and technical operation of rebound testing of high-strength concrete.

[0003] Traditional high-strength concrete rebound hammers have the following drawbacks and shortcomings in practical use: First, traditional rebound hammers use a mechanical pointer to indicate the rebound value. The pointer rebounds via a hammer and indicates the corresponding rebound value on a scale. The operator needs to read the value indicated by the vernier pointer to record the rebound value. The pointer is prone to wear, and the readings are susceptible to human error. Second, traditional rebound hammers require multiple people to operate, as both measurement and recording require manual operation, and a large amount of concrete strength data needs to be transcribed, summarized, and analyzed.

[0004] Existing rebound hammers are mostly independent measuring devices, with test data stored separately in each instrument. There is a lack of a unified cloud management platform to centrally manage and analyze data from multiple devices and projects.

[0005] Existing rebound testing technologies for high-strength concrete have significant shortcomings in terms of measurement accuracy, testing efficiency, intelligence, and systematic management. There is an urgent need for an intelligent rebound testing system that can detect high-strength concrete, has high-precision displacement sensing, voice interaction, and cloud data management functions. Summary of the Invention

[0006] The purpose of this invention is to provide a rebound testing system and method specifically for high-strength concrete, thereby solving the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides a rebound testing system for high-strength concrete, comprising a rebound hammer body, an impact assembly, a displacement sensing unit, a voice recognition module, a communication module, a touch screen module, and a control unit. The impact assembly is disposed inside the rebound hammer body and includes a central guide rod, an impact hammer, an energy storage spring, and an impact rod. The impact rod is slidably fitted onto the front end of the central guide rod. The displacement sensing unit is disposed on the rear side wall of the rebound hammer body. The displacement sensing unit includes a laser range sensor, a guide rail and a movable seat. A light reflector and an impacted piece are fixed on the movable seat. When the impact hammer rebounds, it strikes the impacted piece to drive the movable seat to slide along the guide rail. The laser range sensor generates a rebound value signal by detecting the displacement of the movable seat. The voice recognition module, communication module, and control unit are all located inside the main body of the rebound hammer. The voice recognition module is used to collect and recognize the measurement point location description information input by the operator's voice. The communication module is used to upload the rebound value signal and the measurement point location description information to a remote server. The touch screen module is embedded on the surface of the main body of the rebound hammer for visually displaying the detection information and providing a touch operation interface. The control unit is electrically connected to the displacement sensing unit, the voice recognition module, the communication module, and the touch screen module, respectively.

[0008] Preferably, the rear end of the impact rod has a countersunk hole extending axially, and the front end of the central guide rod is coaxially inserted into the countersunk hole and can slide relative to it; The impact assembly also includes a buffer spring and a limiting member. The limiting member is fixed to the front end of the central guide rod. The buffer spring is fitted onto the front end of the central guide rod and accommodated inside the countersunk hole. One end of the buffer spring abuts against the bottom wall of the countersunk hole, and the other end abuts against the limiting member.

[0009] Preferably, the limiting member is a positioning pin, the front end of the central guide rod has a radial through hole, the positioning pin passes through the radial through hole, and the end of the buffer spring is connected to the positioning pin.

[0010] Preferably, a guide sleeve is fixedly provided on the inner side of the front end of the rebounder body, the impact rod passes through the guide sleeve and can reciprocate along the axial direction, the inner wall of the guide sleeve and the outer wall of the impact rod are in clearance fit, and the front end face of the guide sleeve abuts against the limiting step on the inner side of the front end of the rebounder body.

[0011] Preferably, the guide rail is composed of two parallel cylindrical guide rails, and the movable seat has two guide holes, through which the two cylindrical guide rails pass respectively. The light reflector is fixed to the movable seat on the side facing the laser rangefinder, and the impact-bearing spring is fixed to the movable seat on the side facing the impact hammer.

[0012] Preferably, the impact-bearing spring is an L-shaped spring sheet, one end of which is fixedly connected to the movable seat, and the other end extends toward the impact hammer. The extended end of the L-shaped spring sheet is provided with an arc-shaped impact surface.

[0013] Preferably, an auxiliary support assembly is detachably installed at the front end of the rebound hammer body. The auxiliary support assembly includes a clamping structure, a fixed connecting seat, a quick-locking structure, and a support bracket. The clamping structure is an annular clamp with an opening, which is used to detachably clamp and fix it to the outer periphery of the front end of the rebound hammer cylinder. The fixed connecting seat is fixed to the outer wall of the clamping structure, and the upper end of the support bracket is locked and fixed to the fixed connecting seat by a quick-lock handle; Support legs are arranged on both sides of the lower end of the support bracket, and each support leg is provided with a support foot at the bottom end to abut against the surface of the component being tested, forming multi-point stable support for the front end of the rebound hammer.

[0014] Preferably, the impact assembly further includes a guide flange and a hook. The guide flange is fixedly disposed at the rear end of the central guide rod, and the hook is hinged to the guide flange. The hook is used to hook the impact hammer during the energy storage stage and release the impact hammer when the impact hammer moves to a preset unhooking position. The front end of the rebound device body is provided with a cap, and the impact rod extends from the central hole of the cap. The rear end of the rebound hammer body is provided with a tail cover, and the tail cover is provided with a zero adjustment screw, the front end of which corresponds to the rear end of the guide flange.

[0015] A rebound testing method specifically for high-strength concrete includes the following steps: S1. Based on the estimated strength grade of the high-strength concrete to be tested, select an impact rod with a corresponding spherical impact radius and install it on the main body of the rebound hammer. S2. The operator inputs the description of the measurement point location of the component under test by voice through the voice recognition module. The control unit transmits the recognition result of the voice recognition module to the touch screen module for display. The operator confirms or corrects the recognition result through the touch screen module. S3. Place the main body of the rebound hammer against the surface of the high-strength concrete to be tested, so that the axis of the impact rod is perpendicular to the test surface. Apply pressure to make the impact hammer store energy and then release it to perform the impact operation. When the impact hammer rebounds, it hits the impacted piece to drive the movable seat to slide along the guide rail. The laser range sensor detects the displacement of the movable seat and generates a rebound value signal. S4. The control unit uploads the measurement point location description information and rebound value signal to the remote server through the communication module; S5. The operator can log in to the remote management platform to view, analyze, or export the rebound value signal and measurement point location description information.

[0016] Preferably, in S3, rebound value signals of 16 measuring points are collected in a uniform distribution within each measuring area. The control unit removes the 3 maximum values ​​and 3 minimum values ​​from the 16 rebound values, and takes the average of the remaining 10 rebound values ​​as the average rebound value of the measuring area. When multiple test zones are arranged for the same component, the concrete strength conversion value of each test zone is obtained by converting the average rebound value of each test zone. Then, the minimum value of the strength conversion value of all test zones or the estimated value calculated by statistical method is taken as the estimated concrete strength result of the component.

[0017] Therefore, this invention provides a rebound detection system and method specifically for high-strength concrete, which has the following beneficial effects: This invention generates a rebound value signal by detecting the displacement of the movable seat using a laser rangefinder sensor, avoiding measurement deviations caused by mechanical pointer wear, and improving displacement detection accuracy and cycle life. The guide rail consists of two parallel cylindrical guide rails, and the movable seat slides smoothly along the guide rails, further ensuring the repeatability and reliability of displacement measurement.

[0018] This invention uses a voice recognition module to collect and recognize the operator's voice input describing the location of measurement points. Operators no longer need to manually record or input component location information, significantly reducing the labor intensity of on-site testing. Simultaneously, the recognition results are displayed in real-time via a touchscreen module, allowing operators to confirm or correct the results on-site. This approach leverages the efficiency of voice input while ensuring the accuracy of location information.

[0019] This invention features an auxiliary support assembly detachably mounted at the front end of the rebound hammer body. This assembly includes a clamping structure, a fixed connecting seat, a quick-locking structure, and a support bracket. Support legs are arranged on both sides of the lower end of the support bracket, and each support leg has a supporting foot at its bottom. This auxiliary support assembly provides multi-point stable support to the front end of the rebound hammer.

[0020] This invention uses a communication module to upload rebound value signals and measurement point location descriptions to a remote server in real time, enabling automatic acquisition, transmission, and storage of detection data. Operators can log in to a remote management platform to view, analyze, or export rebound value signals and measurement point location descriptions, supporting centralized management of multiple devices and projects, significantly improving the efficiency and security of data management. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a high-strength concrete rebound testing system according to Embodiment 1 of the present invention; Figure 2 This is a second-view schematic diagram of the overall structure of a high-strength concrete rebound testing system according to Embodiment 1 of the present invention; Figure 3This is a cross-sectional view of a high-strength concrete rebound testing system according to Embodiment 1 of the present invention; Figure 4 This is a partial cross-sectional view of a high-strength concrete rebound testing system according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the auxiliary support component in Embodiment 1 of the present invention; Figure 6 This is a left view of the auxiliary support component in Embodiment 1 of the present invention; Figure 7 This is a cross-sectional view of the rebound hammer body in Embodiment 1 of the present invention; Figure Labels 1. Rebound hammer body; 11. Housing; 111. Limiting step; 13. Cap; 132. Sealing ring; 133. Snap ring; 14. Tail cap; 141. Zeroing screw; 142. Compression spring; 2. Impact assembly; 21. Center guide rod; 22. Impact hammer; 23. Energy storage spring; 231. Tension spring seat; 24. Impact rod; 25. Buffer spring; 26. Limiting component; 27. Guide sleeve; 28. Guide flange; 29. ​​Hook; 291. Hook compression spring; 3. Displacement Sensing unit; 31. Laser rangefinder sensor; 32. Guide rail; 33. Movable seat; 331. Light reflector; 332. Impact spring; 333. Guide hole; 4. Voice recognition module; 5. Communication module; 6. Touch screen module; 7. Control unit; 8. Auxiliary support assembly; 81. Clamping structure; 811. Ring clamp; 82. Fixed connection seat; 83. Quick-locking structure; 84. Support bracket; 841. Support leg; 842. Support foot. Detailed Implementation

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] Example 1 like Figure 1-7 As shown, this invention discloses a rebound testing system for high-strength concrete, comprising a rebound hammer body 1, an impact assembly 2, a displacement sensing unit 3, a voice recognition module 4, a communication module 5, a touch screen module 6, and a control unit 7. The rebound hammer body 1 includes a housing 11 and a mechanism disposed inside the housing 11. The housing 11 is a hollow cylindrical shape. The impact assembly 2 is disposed inside the rebound hammer body 1 and includes a central guide rod 21, an impact hammer 22, an energy storage spring 23, and an impact rod 24. The central guide rod 21 is disposed axially inside the housing 11. The impact hammer 22 is slidably mounted on the central guide rod 21. The energy storage spring 23 connects the impact hammer 22 and the tension spring seat 231. The impact rod 24 is slidably mounted on the front end of the central guide rod 21, and the front end of the impact rod 24 has a spherical impact end.

[0026] The displacement sensing unit 3 is disposed on the rear side wall of the rebound hammer body 1, and includes a laser rangefinder 31, a guide rail 32, and a movable seat 33. A light reflector 331 and an impact-bearing fragment 332 are fixed on the movable seat 33. When the impact hammer 22 rebounds, it strikes the impact-bearing fragment 332 to drive the movable seat 33 to slide along the guide rail 32. The laser rangefinder 31 generates a rebound value signal by detecting the displacement of the movable seat 33.

[0027] The voice recognition module 4, communication module 5, and control unit 7 are all located inside the rebound hammer body 1. The voice recognition module 4 collects and recognizes the measurement point location description information input by the operator's voice. The communication module 5 uploads the rebound value signal and measurement point location description information to a remote server. The touch screen module 6 is embedded in the surface of the rebound hammer body 1, used for visually displaying detection information and providing a touch operation interface. The control unit 7 is electrically connected to the displacement sensing unit 3, voice recognition module 4, communication module 5, and touch screen module 6, respectively.

[0028] The rear end of the impact rod 24 has a countersunk hole extending axially. The front end of the central guide rod 21 is coaxially inserted into the countersunk hole and can slide relative to it. The impact assembly 2 also includes a buffer spring 25 and a limiting member 26. The limiting member 26 is fixed to the front end of the central guide rod 21. In this embodiment, the limiting member 26 is preferably a positioning pin. The front end of the central guide rod 21 has a radial through hole, and the positioning pin passes through the radial through hole. The buffer spring 25 is fitted onto the front end of the central guide rod 21 and accommodated inside the countersunk hole. One end of the buffer spring 25 abuts against the bottom wall of the countersunk hole, and the other end abuts against the positioning pin.

[0029] When not in operation, the impact rod 24 is held extended from the front end of the housing 11 by the force of the buffer spring 25. When the operator presses the rebound hammer against the concrete testing surface, the impact rod 24 slides axially backward under force, compressing the buffer spring 25. When the impact hammer 22 is released and strikes the impact rod 24, the buffer spring 25 absorbs part of the impact energy, thus buffering and damping the vibration.

[0030] A guide sleeve 27 is fixedly installed on the inner front side of the rebound hammer body 1. The impact rod 24 passes through the guide sleeve 27 and can reciprocate axially. The inner wall of the guide sleeve 27 and the outer wall of the impact rod 24 are clearance-fitted. The front end face of the guide sleeve 27 abuts against the limiting step 111 on the inner front side of the rebound hammer body 1 to achieve axial positioning. The guide sleeve 27 ensures the straightness of the impact rod 24's axial movement and prevents the impact rod 24 from radially deflecting or swaying during reciprocating motion.

[0031] The impact rod 24 is equipped with multiple replaceable standard parts, each with the same outer diameter and total length but different spherical impact radii at its tip. In this embodiment, the spherical impact radius of the impact rod 24 ranges from 5mm to 35mm, specifically including six specifications: 5mm, 7.5mm, 10mm, 15mm, 25mm, and 35mm, respectively applied to six different intervals for testing the compressive strength of concrete from 10MPa to 130MPa. The operator can select the impact rod 24 with the corresponding spherical impact radius and install it on the rebound hammer body 1 according to the estimated strength grade of the high-strength concrete to be tested.

[0032] The guide rail 32 consists of two parallel cylindrical guide rails, positioned axially along the rear end of the housing 11. The movable seat 33 has two guide holes 333, through which the two cylindrical guide rails pass. The movable seat 33 can slide freely along the cylindrical guide rails, and the two parallel cylindrical guide rails ensure the straightness and stability of the movable seat 33's axial movement.

[0033] The light reflector 331 is fixed to the side end face of the movable base 33 facing the laser rangefinder 31. The light reflector 331 is made of white high-reflectivity material to improve the intensity of the laser reflection signal. The impact-bearing spring 332 is fixed to the side end face of the movable base 33 facing the impact hammer 22.

[0034] The laser rangefinder 31 measures the displacement of the movable seat 33 by emitting a laser beam to the light reflector 331 and receiving the reflected light. When the impact hammer 22 rebounds and strikes the impacted spring 332, it drives the movable seat 33 to slide along the cylindrical guide rail. The laser rangefinder 31 generates a rebound value signal by detecting the displacement of the movable seat 33.

[0035] In this embodiment, the impact spring 332 is an L-shaped spring sheet. One end of the L-shaped spring sheet is fixedly connected to the movable seat 33, and the other end extends towards the impact hammer 22.

[0036] The speech recognition module 4 uses an offline speech recognition chip (such as the LD3320 chip), which integrates a speech recognition processor and a digital-to-analog converter. This chip supports user-defined command dictionaries and can perform speech recognition directly without prior user training, enabling speaker-independent speech recognition.

[0037] The voice recognition module 4 is connected to the control unit 7 via an SPI serial communication interface. Before inputting the component position information via voice, the encoding table corresponding to the characters and words to be recognized is first entered into the control unit 7 to generate a keyword list. After the operator triggers voice input by pressing the voice input button on the main body 1 of the rebound hammer, the voice recognition chip performs spectrum analysis, feature extraction, and recognition on the voice signal. The recognition result is then compared with the words in the keyword list for similarity matching. The word with the highest matching degree is the final recognition result and is fed back to the control unit 7.

[0038] Communication module 5 consists of a Bluetooth communication submodule and a 4G Cat.1 communication submodule. The Bluetooth communication submodule is used to establish a near-field wireless connection with on-site mobile terminal devices to enable on-site viewing of test data, equipment calibration, or data relay and uploading via a mobile terminal application. The 4G Cat.1 communication submodule reuses a 4G cellular network base station to directly upload the rebound value signal and measurement point location description information to a remote server.

[0039] The touch screen module 6 includes a touch display screen and a touch driving circuit. The touch display screen is embedded on the surface of the rear end of the rebounder body 1, and preferably uses a 2.4-inch resistive touch screen. It has a built-in 64MHz processor and 4M Bytes Flash memory.

[0040] The touch drive circuit is connected to the control unit 7 via a serial communication interface. The touch screen module 6 displays the following information: rebound value data, component position information, network connection status of the communication module 5, signal strength, and data transmission status.

[0041] The front end of the rebounder body 1 is also detachably equipped with an auxiliary support assembly 8. The auxiliary support assembly 8 includes a clamping structure 81, a fixed connecting seat 82, a quick-locking structure 83, and a support bracket 84.

[0042] The clamping structure 81 is an open-ended annular clamp 811, used for detachably clamping and fixing to the outer periphery of the front end of the rebound hammer cylinder. The inner diameter of the clamp 811 is adapted to the outer diameter of the rebound hammer cylinder, and the clamping force of the annular clamp 811 ensures reliable fixation of the auxiliary support assembly 8 at the front end of the rebound hammer body 1. The fixed connecting seat 82 is fixed to the outer wall of the clamping structure 81. The upper end of the support bracket 84 is locked and fixed to the fixed connecting seat 82 by a quick-lock handle, which allows for quick installation and removal of the support bracket 84 relative to the fixed connecting seat 82.

[0043] Support legs 841 are arranged on both sides of the lower end of the support bracket 84, and each support leg 841 has a support foot 842 at its bottom. There are two support legs 841, which are used to abut against the surface of the component being tested to form multi-point stable support for the front end of the rebound hammer.

[0044] In use, the auxiliary support assembly 8 is installed at the front end of the rebound hammer body 1. The operator holds the rebound hammer body 1 and presses the impact rod 24 vertically against the concrete test surface. The impact rod 24 retracts into the housing 11 under force. When the impact rod 24 is compressed to near its maximum stroke, the support foot 842 of the support leg 841 rests against the test surface. Under the constraint of the support leg 841, the axis of the rebound hammer body 1 is limited to be perpendicular to the test surface, ensuring that the impact rod 24 remains perpendicular to the test surface at the moment of impact.

[0045] The impact assembly 2 also includes a guide flange 28 and a hook 29. The guide flange 28 is fixedly mounted on the rear end of the central guide rod 21. The hook 29 is hinged to the guide flange 28. The hook 29 is used to hook the impact hammer 22 during the energy storage phase and release the impact hammer 22 when the impact hammer 22 moves to a preset unhooking position.

[0046] One end of the hook spring 291 is connected to the hook 29, and the other end is connected to the guide flange 28. The hook spring 291 is used to provide a restoring force to the hook 29 so that the hook 29 remains in the initial state of hooking the impact hammer 22. When the operator presses the rebound device to retract the impact rod 24, the impact hammer 22 moves backward along the central guide rod 21 and drives the hook 29 to rotate. When it reaches the unhooked position, the hook 29 releases the impact hammer 22, and the impact hammer 22 bounces forward to strike the impact rod 24 under the action of the energy storage spring 23.

[0047] A cap 13 is provided at the front end of the rebound hammer body 1. The cap 13 is fitted over the outside of the impact rod 24, which extends from the central hole of the cap 13 and can slide relative to it. The cap 13 is a hollow cone-shaped body. A sealing ring 132 is arranged axially at the contact point between the end of the cap 13 and the impact rod 24. A retaining ring 133 is located on the upper part of the sealing ring 132. The cap 13 serves to guide and seal the impact rod 24, preventing external dust from entering the interior of the housing 11.

[0048] The rear end of the rebound hammer body 1 is provided with a tail cover 14, which is detachably connected to the rear port of the rebound hammer body 1. A zero-adjustment screw 141 is provided on the tail cover 14. The zero-adjustment screw 141 passes through the center of the tail cover 14 and extends into the interior of the rebound hammer body 1. The front end of the zero-adjustment screw 141 abuts against or is spaced apart from the rear end of the guide flange 28.

[0049] A compression spring 142 is arranged between the guide flange 28 and the tail cover 14. The axial position of the guide flange 28 can be adjusted by rotating the zero-adjustment screw 141, thereby adjusting the initial zero position of the rebound hammer.

[0050] Example 2 This embodiment focuses on illustrating the method of using the above-mentioned high-strength concrete-specific rebound testing system for testing.

[0051] S1. Based on the estimated strength grade of the high-strength concrete to be tested, select the corresponding impact rod 24 and install it on the main body 1 of the rebound hammer.

[0052] S2. The operator inputs the description of the measurement point location of the component under test by voice through the voice recognition module 4. The control unit 7 transmits the recognition result of the voice recognition module 4 to the touch screen module 6 for display. The operator confirms or corrects the recognition result through the touch screen module 6.

[0053] After pressing the voice input button, the operator speaks the component's position information into the microphone on the main body 1 of the rebound spring. The voice recognition module 4 recognizes the voice signal and sends the text result to the control unit 7, which displays it on the touch screen module 6. If the recognition result is incorrect, the operator clicks the text control on the touch screen module 6 to bring up the on-screen keyboard for modification. The modified information is then transmitted back to the control unit 7 via the serial port.

[0054] S3. Place the main body 1 of the rebound hammer against the surface of the high-strength concrete to be tested, so that the axis of the impact rod 24 is perpendicular to the test surface. Apply pressure to make the impact hammer 22 store energy and then release it to perform the impact operation. When the impact hammer 22 rebounds, it hits the impacted piece 332 to drive the movable seat 33 to slide along the guide rail 32. The laser range sensor 31 detects the displacement of the movable seat 33 and generates a rebound value signal.

[0055] The operator places the front end of the rebound hammer body 1 against the concrete testing surface, ensuring the axis of the impact rod 24 is perpendicular to the testing surface. Pressure is applied slowly and evenly; the impact rod 24 retracts into the housing 11 under pressure, and the impact hammer 22 moves backward along the central guide rod 21 and is hooked by the hook 29. Pressure continues to be applied until the impact hammer 22 reaches the disengagement position. The hook 29 releases the impact hammer 22, which, under the action of the energy storage spring 23, bounces forward against the impact rod 24. Upon rebound, the impact hammer 22 strikes the impacted spring 332 on the movable seat 33, driving the movable seat 33 to slide along the guide rail 32. The laser rangefinder sensor 31 measures the displacement of the movable seat 33 in real time, generating a rebound value signal.

[0056] Within each test area, rebound value signals are collected from 16 test points evenly distributed. The test points should be evenly distributed within the test area, and the net distance between two adjacent test points should not be less than 30mm. Test points should not be located on pores or exposed stones, and each test point should only be hit once.

[0057] S4 and control unit 7 upload the measurement point location description information and rebound value signal to the remote server through communication module 5.

[0058] The control unit 7 sends AT commands to the communication module via the UART serial port, encapsulates the measurement point location description information and rebound value signal into a data packet, and then uploads it to the TCP server deployed in the cloud via the TCP protocol.

[0059] S5. The operator can log in to the remote management platform to view, analyze, or export the rebound value signal and measurement point location description information.

[0060] Example 3 This embodiment focuses on the calculation of rebound value and strength estimation.

[0061] In S3, after the control unit 7 collects the rebound value signals of 16 measuring points in each measuring area in a uniform distribution, it automatically removes the 3 maximum values ​​and 3 minimum values ​​from the 16 rebound values, and takes the average of the remaining 10 rebound values ​​as the average rebound value of the measuring area.

[0062] The average rebound value of the test area is calculated using the following formula: ; In the formula, This represents the average rebound value of the test area. For the first i The rebound value at each measuring point.

[0063] When multiple test zones are arranged for the same component, the converted concrete strength value for each test zone is obtained by converting the average rebound value of each zone using the strength curve. For high-strength concrete, the strength curve formula is: ; In the formula, For the first i Conversion values ​​for concrete strength in each test area.

[0064] When the number of test areas for the same component is less than 10, the minimum value of the converted strength values ​​of all test areas is taken as the estimated concrete strength value of the component, that is: ; In the formula, This is the estimated value of the concrete strength of the component. This is the converted value of the minimum concrete strength in the test area of ​​the component.

[0065] When there are 10 or more test areas, first calculate the average and standard deviation of the converted concrete strength values ​​for each test area: ; ; In the formula, This represents the average value of the converted concrete strength values ​​for the component's test area. This represents the standard deviation of the converted concrete strength values ​​for the component's test area. This represents the number of test areas for the component.

[0066] The estimated concrete strength is calculated using the following formula: ; The control unit 7 completes the above calculation process and stores the calculation results in the database for the operator to view and export.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A rebound testing system specifically for high-strength concrete, characterized in that: The device includes a rebound device body, a projectile assembly, a displacement sensing unit, a voice recognition module, a communication module, a touch screen module, and a control unit. The projectile assembly is located inside the rebound device body and includes a central guide rod, an impact hammer, an energy storage spring, and a projectile rod. The projectile rod is slidably fitted onto the front end of the central guide rod. The displacement sensing unit is disposed on the rear side wall of the rebound hammer body. The displacement sensing unit includes a laser range sensor, a guide rail and a movable seat. A light reflector and an impacted piece are fixed on the movable seat. When the impact hammer rebounds, it strikes the impacted piece to drive the movable seat to slide along the guide rail. The laser range sensor generates a rebound value signal by detecting the displacement of the movable seat. The voice recognition module, communication module, and control unit are all located inside the main body of the rebound hammer. The voice recognition module is used to collect and recognize the measurement point location description information input by the operator's voice. The communication module is used to upload the rebound value signal and the measurement point location description information to a remote server. The touch screen module is embedded on the surface of the main body of the rebound hammer for visually displaying the detection information and providing a touch operation interface. The control unit is electrically connected to the displacement sensing unit, the voice recognition module, the communication module, and the touch screen module, respectively.

2. The rebound testing system for high-strength concrete according to claim 1, characterized in that: The rear end of the impact rod has a countersunk hole extending axially, and the front end of the central guide rod is coaxially inserted into the countersunk hole and can slide relative to it. The impact assembly also includes a buffer spring and a limiting member. The limiting member is fixed to the front end of the central guide rod. The buffer spring is fitted onto the front end of the central guide rod and accommodated inside the countersunk hole. One end of the buffer spring abuts against the bottom wall of the countersunk hole, and the other end abuts against the limiting member.

3. The rebound testing system for high-strength concrete according to claim 2, characterized in that: The limiting component is a positioning pin, and the front end of the central guide rod has a radial through hole. The positioning pin passes through the radial through hole, and the end of the buffer spring is connected to the positioning pin.

4. The rebound testing system for high-strength concrete according to claim 3, characterized in that: A guide sleeve is fixedly provided on the inner front side of the main body of the rebounder. The impact rod passes through the guide sleeve and can reciprocate along the axial direction. The inner wall of the guide sleeve and the outer wall of the impact rod are in clearance fit. The front end face of the guide sleeve abuts against the limiting step on the inner front side of the main body of the rebounder.

5. The rebound testing system for high-strength concrete according to claim 1, characterized in that: The guide slide rail is composed of two parallel cylindrical guide rails, and the movable seat has two guide holes, through which the two cylindrical guide rails pass respectively. The light reflector is fixed to the movable seat on the side facing the laser rangefinder, and the impact-bearing spring is fixed to the movable seat on the side facing the impact hammer.

6. The rebound testing system for high-strength concrete according to claim 5, characterized in that: The impact-bearing spring is an L-shaped spring sheet. One end of the L-shaped spring sheet is fixedly connected to the movable seat, and the other end extends toward the impact hammer. The extended end of the L-shaped spring sheet is provided with an arc-shaped impact surface.

7. The rebound testing system for high-strength concrete according to claim 1, characterized in that: The front end of the rebound hammer body can also be detachably installed with an auxiliary support component. The auxiliary support component includes a clamping structure, a fixed connecting seat, a quick-locking structure, and a support bracket. The clamping structure is an annular clamp with an opening, which is used to detachably clamp and fix it to the outer periphery of the front end of the rebound hammer cylinder. The fixed connecting seat is fixed to the outer wall of the clamping structure, and the upper end of the support bracket is locked and fixed to the fixed connecting seat by a quick-lock handle; Support legs are arranged on both sides of the lower end of the support bracket, and each support leg is provided with a support foot at the bottom end to abut against the surface of the component being tested, forming multi-point stable support for the front end of the rebound hammer.

8. The rebound testing system for high-strength concrete according to claim 1, characterized in that: The impact assembly also includes a guide flange and a hook. The guide flange is fixedly disposed at the rear end of the central guide rod, and the hook is hinged to the guide flange. The hook is used to hook the impact hammer during the energy storage phase and release the impact hammer when the impact hammer moves to the preset unhooking position. The front end of the rebound device body is provided with a cap, and the impact rod extends from the central hole of the cap. The rear end of the rebound hammer body is provided with a tail cover, and the tail cover is provided with a zero adjustment screw, the front end of which corresponds to the rear end of the guide flange.

9. A rebound testing method specifically for high-strength concrete, using the rebound testing system for high-strength concrete as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Based on the estimated strength grade of the high-strength concrete to be tested, select an impact rod with a corresponding spherical impact radius and install it on the main body of the rebound hammer. S2. The operator inputs the description of the measurement point location of the component under test by voice through the voice recognition module. The control unit transmits the recognition result of the voice recognition module to the touch screen module for display. The operator confirms or corrects the recognition result through the touch screen module. S3. Place the main body of the rebound hammer against the surface of the high-strength concrete to be tested, so that the axis of the impact rod is perpendicular to the test surface. Apply pressure to make the impact hammer store energy and then release it to perform the impact operation. When the impact hammer rebounds, it hits the impacted piece to drive the movable seat to slide along the guide rail. The laser range sensor detects the displacement of the movable seat and generates a rebound value signal. S4. The control unit uploads the measurement point location description information and rebound value signal to the remote server through the communication module; S5. The operator can log in to the remote management platform to view, analyze, or export the rebound value signal and measurement point location description information.

10. The rebound testing method for high-strength concrete according to claim 9, characterized in that: In S3, rebound value signals from 16 measuring points are collected in a uniform distribution within each measuring area. The control unit removes the three maximum and three minimum values ​​from the 16 rebound values ​​and takes the average of the remaining 10 rebound values ​​as the average rebound value of the measuring area. When multiple test zones are arranged for the same component, the concrete strength conversion value of each test zone is obtained by converting the average rebound value of each test zone. Then, the minimum value of the strength conversion value of all test zones or the estimated value calculated by statistical method is taken as the estimated concrete strength result of the component.

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