Concrete strength detection device

Abstract

The utility model provides a concrete strength detection device which comprises a shell and a guide sleeve, and the guide sleeve is elastically connected with the shell; a force measuring sensor and a displacement sensor are arranged in the shell at intervals, a probe is arranged in the guide sleeve, the end part, deviating from the shell, of the probe penetrates through the guide sleeve, and the end part, close to the shell, of the probe is connected with the force measuring sensor; the force measuring sensor is configured to detect the penetration force of the probe penetrating into the concrete, and the displacement sensor is configured to detect the compression displacement of the guide sleeve in the probe penetration process; the strength of the concrete is the ratio of the penetration force to the penetration depth of the probe, and the penetration depth is the compression displacement of the guide sleeve. The detection device provided by the utility model is convenient to carry, provides convenient detection conditions for existing concrete strength detection, and is helpful for improving the detection precision at the same time.

Description

Technical Field

[0001] This application relates to the field of concrete quality testing technology, and in particular to a concrete strength testing device. Background Technology

[0002] In bridge and tunnel construction, concrete strength is a crucial indicator for measuring construction quality and ensuring construction safety. As shotcrete is a primary support method in tunnel construction, its strength information is extremely important. The penetration test is a commonly used method for testing concrete strength.

[0003] Specifically, a concrete penetrator is used to dynamically insert the probe into hardened concrete. After the probe is withdrawn, the penetration depth is measured, and the concrete strength is calculated based on a predetermined relationship between penetration depth and concrete strength. However, the detection accuracy of the above-mentioned testing device is relatively low. Utility Model Content

[0004] The embodiments of this application provide a concrete strength testing device that can improve testing accuracy, is easy to carry, has a wide range of applications, and enhances user experience.

[0005] To achieve the above objectives, embodiments of this application provide a concrete strength testing device, including a housing and a guide sleeve, wherein the guide sleeve and the housing are elastically connected;

[0006] A force sensor and a displacement sensor are spaced apart inside the housing. A probe is provided in the guide sleeve. The end of the probe away from the housing passes through the guide sleeve, and the end of the probe close to the housing is connected to the force sensor.

[0007] The force sensor is configured to detect the penetration force of the probe into the concrete, and the displacement sensor is configured to detect the compressive displacement of the guide sleeve during the probe penetration process; the strength of the concrete is the ratio of the penetration force to the penetration depth of the probe, wherein the penetration depth is the compressive displacement of the guide sleeve.

[0008] In one possible implementation, an elastic element is further included, which is disposed between the guide sleeve and the housing, with its two ends abutting against the guide sleeve and the housing respectively, and the guide sleeve is elastically connected to the housing through the elastic element.

[0009] In one possible implementation, a connecting shaft is further included, which connects the guide sleeve and the housing, the elastic element is sleeved outside the connecting shaft, and the probe is connected to the force sensor through the connecting shaft.

[0010] In one possible implementation, a guide bearing is also included; the guide bearing connects the guide sleeve and the connecting shaft, and is fitted over the probe.

[0011] In one possible implementation, a protective housing is also included, the protective housing connecting the guide bearing and the housing, and the elastic element is located within the protective housing;

[0012] The radial dimension of the protective shell is greater than the dimension of the guide sleeve but less than the radial dimension of the housing.

[0013] In one possible implementation, a probe clamp is provided on the guide sleeve, and the probe clamp fixes the probe.

[0014] The concrete strength testing device also includes a locking screw, which secures the probe clamp.

[0015] In one possible implementation, the displacement sensor includes a laser displacement sensor, and a reflector is provided on the guide sleeve;

[0016] The displacement sensor is configured to emit a laser beam to the reflector and receive the reflected light signal.

[0017] In one possible implementation, a temperature sensor is also provided inside the housing, and the force sensor, the displacement sensor and the temperature sensor are arranged at intervals along the radial direction of the housing; the temperature sensor is configured to monitor the temperature of the concrete.

[0018] In one possible implementation, a handle is provided at the bottom of the housing, and a probe box is placed in the handle;

[0019] And / or, the housing contains a motherboard and a battery, and along the direction from the guide sleeve to the housing, the force sensor, the motherboard, and the battery are arranged in sequence at intervals.

[0020] In one possible implementation, the housing includes an upper shell and a lower shell, with the upper shell covering the lower shell;

[0021] The force sensor and the displacement sensor are located in the lower shell. The upper shell is equipped with a touch screen and the buttons. The lower shell has a charging port and an indicator light on the side away from the guide sleeve.

[0022] The concrete strength testing device provided in this application integrates the force sensor, displacement sensor, guide sleeve, and probe into a single housing, eliminating the need for separate accessories. Its compact structure makes it easy to carry, providing convenient testing conditions for existing concrete strength testing. The guide sleeve helps ensure that the probe moves linearly along the axial direction during penetration, thereby ensuring the detection accuracy of the displacement sensor and force sensor.

[0023] The structure of this application, as well as its other objectives and beneficial effects, will become more apparent from the description of the preferred embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the concrete strength testing device provided in the embodiments of this application;

[0026] Figure 2 This is an internal schematic diagram of the concrete strength testing device provided in the embodiments of this application;

[0027] Figure 3 This is a top view of the concrete strength testing device provided in the embodiments of this application;

[0028] Figure 4 This is a left view of the concrete strength testing device provided in the embodiments of this application;

[0029] Figure 5 This is a right view of the concrete strength testing device provided in the embodiments of this application;

[0030] Figure 6 A schematic diagram of the connection structure between the guide sleeve and the elastic element of the concrete strength testing device provided in the embodiments of this application;

[0031] Figure 7 This is a side view of the concrete strength testing device provided in an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of the handle of the concrete strength testing device provided in the embodiments of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100 - Concrete strength testing device;

[0035] 110 - Housing; 111 - Top shell; 112 - Bottom shell; 113 - Touchscreen display; 114 - Buttons; 115 - Charging port; 116 - Indicator light; 117 - USB port;

[0036] 120 - Guide sleeve; 121 - Probe chuck; 122 - Locking screw;

[0037] 131-Force sensor; 132-Displacement sensor; 133-Temperature sensor; 134-Temperature sensor probe; 135-Force sensor connecting shaft; 136-Displacement sensor probe;

[0038] 140 - Protective housing;

[0039] 150-probe;

[0040] 160 - Elastic element;

[0041] 170 - Connecting shaft;

[0042] 180-Guide bearing;

[0043] 191-Handle; 192-Probe box; 193-Main board; 194-Battery. Detailed Implementation

[0044] In related technologies, the strength of concrete is calculated by measuring the penetration depth of a probe into a hole and then determining the relationship between the penetration depth and concrete strength. However, this penetration method uses dynamic penetration, which is significantly affected by damping. Furthermore, the detection is easily affected by the surface condition of the concrete, and the penetration depth measurement is greatly affected by surface flatness. Different measurement positioning benchmarks also result in significant errors.

[0045] Based on the above-mentioned technical problems, this application provides a concrete strength testing device. By integrating the force sensor, displacement sensor, guide sleeve and probe into a single housing, no separate accessories are required. The structure is compact and easy to carry, providing convenient testing conditions for existing concrete strength testing. By including the guide sleeve, it helps to ensure that the probe moves linearly along the axial direction during penetration, thereby ensuring the detection accuracy of the displacement sensor and force sensor.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Reference Figures 1 to 5 As shown in the figure, this application provides a concrete strength testing device 100, including a housing 110 and a guide sleeve 120, the guide sleeve 120 and the housing 110 being elastically connected.

[0048] In this embodiment, the elastic connection design enables the device to adapt to concrete testing areas with different surface flatness. When the concrete surface is uneven, the guide sleeve 120 can automatically adjust through elastic deformation to ensure that the probe 150 penetrates the concrete vertically. This avoids the probe 150 being deflected due to uneven surface, which affects the test results. This expands the applicability of the device and enhances its practicality in actual engineering testing scenarios.

[0049] In this embodiment, refer to Figure 1 and Figure 2 As shown, a force sensor 131 and a displacement sensor 132 are spaced apart inside the housing 110. A probe 150 is provided in the guide sleeve 120. The end of the probe 150 away from the housing 110 passes through the guide sleeve 120, and the end of the probe 150 near the housing 110 is connected to the force sensor 131.

[0050] The probe 150 is directly connected to the force sensor 131 and is located in a relatively stable environment inside the housing 110, which minimizes the impact of external interference on force detection. When the probe 150 penetrates the concrete, the penetration force can be transmitted to the force sensor 131 without loss, accurately capturing minute force changes during concrete penetration and ensuring that the detected penetration force data is true and reliable.

[0051] In this embodiment, core components such as the force sensor 131, displacement sensor 132, guide sleeve 120, and probe 150 are integrated into the same housing 110, forming an integrated structure. During use, the testing personnel only need to align the guide sleeve 120 with the concrete testing area and apply pressure to allow the probe 150 to penetrate. This automatically completes the detection of penetration force and depth, eliminating the need for additional complex installation and debugging steps, significantly simplifying the operation process and improving testing efficiency.

[0052] In this embodiment, the force sensor 131 is configured to detect the penetration force of the probe 150 into the concrete, and the displacement sensor 132 is configured to detect the compressive displacement of the guide sleeve 120 during the penetration of the probe 150; the strength of the concrete is the ratio of the penetration force to the penetration depth of the probe 150, wherein the penetration depth is the compressive displacement of the guide sleeve 120.

[0053] For example, refer to Figure 2 As shown, the force sensor 131 is connected to the force sensor connecting shaft 135, and is connected to the connecting shaft 170 through the force sensor connecting shaft 135.

[0054] In this embodiment, the penetration depth of the probe 150 is determined by detecting the compressive displacement of the guide sleeve 120 using a displacement sensor 132. This method avoids the deviations caused by operating techniques and reading errors in traditional manual depth measurement. Furthermore, by elastically connecting the housing 110 to the guide sleeve 120, the displacement sensor 132 only measures the compressive displacement of the guide sleeve 120 related to the penetration depth of the probe 150, greatly improving the accuracy of penetration depth detection.

[0055] Furthermore, by acquiring the two key parameters of penetration force and penetration depth through the force sensor 131 and displacement sensor 132, and based on the calculation method that "the strength of concrete is the ratio of penetration force to the penetration depth of probe 150," the coordinated detection of mechanical and geometric parameters is achieved. Compared with single-parameter detection methods, the dual-parameter method verifies and complements each other, effectively reducing the detection error caused by a single factor, making the final calculated concrete strength value closer to the true strength, and keeping the overall detection error at a low level.

[0056] For example, displacement sensor 132 can be detected by displacement sensor probe 136.

[0057] In one possible implementation, refer to Figure 2 and Figure 6 As shown, it may also include an elastic element 160, which is disposed between the guide sleeve 120 and the housing 110, and its two ends abut against the guide sleeve 120 and the housing 110 respectively. The guide sleeve 120 is elastically connected to the housing 110 through the elastic element 160.

[0058] For example, the elastic element 160 can be a spring.

[0059] By incorporating the elastic element 160, its buffering characteristics eliminate the need for precise control of the applied force speed and intensity when operating the device. Even if the pressure application process is not smooth, the elastic element 160 can transform uneven force into a smooth penetration force. The inspector only needs to align the guide sleeve 120 with the inspection area and apply moderate pressure to complete the inspection, reducing the skill requirements for operators and improving inspection efficiency.

[0060] Meanwhile, the elastic element 160 can absorb the impact force and vibration during the penetration of the probe 150, reducing direct impact on precision components such as the force sensor 131 and displacement sensor 132. For example, when the probe 150 accidentally hits a hard object inside the concrete, the elastic element 160 can absorb most of the impact force through its own deformation, preventing the sensor from being damaged due to excessive force, extending the service life of the core components inside the device, and improving the reliability and stability of the device.

[0061] In one possible implementation, refer to Figure 2 and Figure 6 As shown, it may also include a connecting shaft 170, which connects the guide sleeve 120 and the housing 110. An elastic element 160 is sleeved on the outside of the connecting shaft 170, and the probe 150 is connected to the force sensor 131 through the connecting shaft 170.

[0062] In this embodiment, the connecting shaft 170 serves as a rigid connection between the guide sleeve 120 and the housing 110, providing a stable installation reference and motion guide for the elastic element 160. It forms a precise fit with the inner hole of the guide sleeve 120, ensuring that the guide sleeve 120 always slides smoothly along the axial direction during the compression or rebound of the elastic element 160, avoiding radial offset or shaking, preventing detection errors caused by component misalignment, and enhancing the overall stability of the device.

[0063] In addition, the connecting shaft 170 and the probe 150 and the force sensor 131 establish a stable force transmission channel. Compared with non-rigid connection, the connecting shaft 170 can avoid force attenuation or fluctuation caused by elastic deformation or loosening, ensuring that the penetration force data obtained by the force sensor 131 truly reflects the force situation of the probe 150, and further improving the force detection accuracy.

[0064] In one possible implementation, refer to Figure 2 , Figure 3 and Figure 6 As shown, it may also include a guide bearing 180; the guide bearing 180 connects the guide sleeve 120 and the connecting shaft 170, and is sleeved on the outside of the probe 150.

[0065] By setting the guide bearing 180 to be sleeved outside the probe 150, the sliding friction between the probe 150 and the guide sleeve 120 is converted into rolling friction through its high-precision ball or roller structure, which significantly reduces the coefficient of friction.

[0066] Furthermore, the stable support provided by the guide bearing 180 makes the compressive displacement of the guide sleeve 120 more stable and controllable during the penetration of the probe 150. The displacement sensor 132 determines the penetration depth of the probe 150 by detecting the compressive displacement of the guide sleeve 120. The presence of the guide bearing 180 ensures that this displacement is only related to the axial movement of the probe 150, avoiding additional displacement errors introduced by the wobbling or offset of the probe 150, and ensuring that the penetration depth detection accuracy is maintained within ±0.01mm, providing a precise data basis for concrete strength calculation.

[0067] In one possible implementation, refer to Figure 2 As shown, it may also include a protective housing 140, which connects the guide bearing 180 and the housing 110, and the elastic element 160 is located in the protective housing 140;

[0068] The radial dimension of the protective shell 140 is greater than that of the guide sleeve 120 and less than that of the shell 110.

[0069] In this embodiment, the protective shell 140 completely encloses the elastic element 160, preventing the elastic element 160 from being directly exposed to the external environment. This prevents the elastic element 160 from failing due to water vapor corrosion or being stuck by dust particles, ensuring that the elastic element 160 always maintains stable elastic performance, continuously plays a buffering and displacement decoupling role, and extends the service life of the core functional components of the device.

[0070] In addition, it should be noted that by setting the radial dimension of the protective shell 140 to be between the guide sleeve 120 and the shell 110, this size design makes the overall structure of the device have a stepped transition, and the layout is more compact and reasonable. It can provide sufficient installation and movement space for internal elastic elements 160, guide bearings 180 and other components, and can avoid stress concentration caused by sudden changes in component size, thereby enhancing the integrity and stability of the device structure.

[0071] In one possible implementation, refer to Figure 2 and Figure 7 As shown, a probe chuck 121 can be provided on the guide sleeve 120, and the probe chuck 121 fixes the probe 150.

[0072] In this embodiment, the concrete strength testing device 100 may further include a locking screw 122, which fixes the probe clamp 121.

[0073] For example, the probe 150 is mounted on the probe chuck 121, and the force sensor 131 is mounted on the connecting shaft 170 to measure the penetration resistance during the measurement process.

[0074] The probe chuck 121 is tightly connected to the guide sleeve 120 via a locking screw 122, forming a reliable mechanical fixing structure. Even when subjected to penetration forces of tens of kilonewtons during the penetration of the probe 150 into the concrete, the locking screw 122 ensures no relative displacement between the probe chuck 121 and the guide sleeve 120, preventing the probe 150 from loosening or falling off. Compared to traditional interference fits or glue fixing methods, this rigid connection improves the fixing stability of the probe 150 by more than 80%, avoiding detection interruptions or data deviations caused by connection failure.

[0075] In one possible implementation, the displacement sensor 132 can be a laser displacement sensor, and a reflector is provided on the guide sleeve 120; the displacement sensor 132 is configured to emit a laser beam to the reflector and receive the reflected light signal.

[0076] The laser displacement sensor does not require direct contact with the guide sleeve 120, avoiding measurement errors caused by sensor wear, installation gaps, or friction in contact measurements. In long-term, high-frequency testing, the non-contact characteristic ensures stable sensor performance, preventing accuracy reduction due to physical wear, and ensuring high consistency and repeatability of displacement data for each measurement.

[0077] It should be noted that since the reflector is set on the guide sleeve 120, when the guide sleeve 120 is displaced, the position of the reflected light on the detector will change. The laser displacement sensor emits a laser pulse and measures the time from the emission of the light pulse to its reflection by the reflector and its return to the receiver, and calculates the distance.

[0078] In one possible implementation, refer to Figure 2 As shown, a temperature sensor 133 is also provided inside the housing 110. Force sensor 131, displacement sensor 132, and temperature sensor 133 are arranged at intervals along the radial direction of the housing 110. For example, the temperature sensor 133 monitors the temperature of the concrete through a temperature sensor probe 134.

[0079] It should be noted that the force sensor 131 (center position), displacement sensor 132 (middle annular area), and temperature sensor 133 (outer edge) are arranged radially along the housing 110, forming a three-layer concentric circle structure. This layout allows each sensor to work independently, avoiding signal interference (e.g., the optical path of the laser displacement sensor is completely separated from the heat conduction path of the temperature sensor 133).

[0080] In one possible implementation, refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 8 As shown, a handle 191 can be provided at the bottom of the housing 110, and a probe box 192 is placed in the handle 191;

[0081] The handle 191 is designed for ease of use by operators. The probe box 192 inside the handle 191 can be a drawer-type or a rotating opening structure, eliminating the need for operators to carry an additional toolkit to store the probes 150. When the probes 150 are worn or need to be replaced, new probes 150 can be quickly retrieved, significantly improving testing efficiency. Simultaneously, the sealed design of the probe box 192 (such as a rubber sealing ring) prevents the probes 150 from being damaged by impacts or contaminated with dust during transportation, ensuring the accuracy of the probes 150.

[0082] Among them, reference Figure 2As shown, a main board 193 and a battery 194 can be housed inside the housing 110. Along the direction from the guide sleeve 120 to the housing 110, the force sensor 131, main board 193, and battery 194 are arranged sequentially at intervals. This minimizes the sensor signal transmission path, reducing signal attenuation and interference. Furthermore, the battery 194 is located at the rear of the device, away from the sensor and main board 193, effectively reducing the impact of battery heat on electronic components.

[0083] For example, the motherboard 193 can be electrically connected to the battery 194, and the battery 194 is used to supply power to the motherboard 193.

[0084] In one possible implementation, refer to Figure 2 and Figure 3 As shown, the housing 110 may include an upper housing 111 and a lower housing 112, with the upper housing 111 covering the lower housing 112; the force sensor 131 and the displacement sensor 132 are distributed in the lower housing 112.

[0085] The upper shell 111 is equipped with a touch screen 113 and buttons 114, while the lower shell 112, on the side away from the guide sleeve 120, is equipped with a charging port 115, an indicator light 116, and a USB port 117. This design improves the device's production efficiency, user experience, and reliability.

[0086] For example, the touch display screen 113 can be electrically connected to the motherboard 193 or the battery 194, and the touch display screen 113 can directly display the strength value. For example, when either the penetration depth or the penetration resistance of the probe 150 into the concrete reaches a preset value, the indicator light 116 lights up, and the operator can stop the advancement of the probe 150 according to the instruction.

[0087] The detection steps of the concrete strength measuring device provided in this application embodiment are as follows:

[0088] Step 1: Create a new test item and name it. Zero the device so that the force sensor detects the penetration resistance of the probe into the concrete and the displacement sensor detects the penetration depth of the probe into the concrete.

[0089] Step 2: Gradually advance the probe into the concrete sample being tested. When either the penetration resistance or the penetration depth detected by the force sensor and displacement sensor reaches a preset value, stop advancing the probe and pull it out.

[0090] Step 3: First, determine whether the test point corresponding to the probe stopping is valid. If it is valid, proceed to Step 4. If it is invalid, return to Step 1 and continue to the next step.

[0091] It should be noted that the criterion for judgment is whether a crack is generated at the test point during the probe insertion process. If a crack has already formed around the test point during the test, it is invalid. If there is no crack around the test point, or if a crack forms only after the probe is withdrawn, it is valid. Cracks generated during the removal of the probe after the test do not affect the validity of the test, and the result remains valid.

[0092] Step 4: The mainboard microcontroller and other control components calculate the concrete strength at the corresponding test point based on the penetration ratio NPI (penetration force to penetration depth) when the probe stops advancing, and display the strength value and the resistance-depth curve of the penetration process on the display screen.

[0093] Step 5: Return to Step 1 and continue to the next step to collect concrete strength data from multiple valid test points, such as 6 to 10 test points. By switching test points, you can view the strength of a single test point. At the same time, the instrument's built-in control and calculation system program calculates and displays the comprehensive strength of the entire test item, thus obtaining the strength of the tested concrete sample.

[0094] Step 6: During the multi-point testing process of this inspection item, the maturity of the concrete can be calculated at the first and last measuring points through temperature sensors. The strength of the concrete can then be calculated based on the maturity and displayed under the comprehensive strength as a reference.

[0095] In this embodiment, the probe diameter is 1.5 mm, smaller than the 3-3.5 mm diameter in the prior art. This 1.5 mm diameter allows for a wider range of probe penetration depths into concrete samples under the same penetration resistance. The ratio of penetration resistance to penetration depth corresponds to strength; a wider range of this ratio results in a wider strength detection range. Limiting the probe diameter to 1.5 mm in this embodiment further expands the range of this ratio, thus further improving the strength detection range for concrete. Specifically, with a probe diameter of 1.5 mm, the detection method in this embodiment is applicable to concrete strength testing of 0.3-10 MPa. Furthermore, the force that a human can apply to a probe is generally 150-400 N. Using a smaller diameter probe in this embodiment eliminates the need for external equipment to apply penetration force to the detection device; it can be applied manually, making concrete strength testing more convenient. Specifically, in step 2, the probe is advanced into the concrete sample being tested at a uniform speed of 2-5 mm / s to minimize the risk of cracking at the test point. Furthermore, in step 2, the preset penetration resistance is 300 N, and the preset penetration depth is 10 mm. In this embodiment, the preset penetration resistance of 300 N can be applied by the operator without the need for external equipment, making the testing process faster and more convenient.

[0096] The concrete strength testing device provided in this application integrates the force sensor, displacement sensor, guide sleeve, and probe into a single housing, eliminating the need for separate accessories. Its compact structure makes it easy to carry, providing convenient testing conditions for existing concrete strength testing. The guide sleeve helps ensure that the probe moves linearly along the axial direction during penetration, thereby ensuring the detection accuracy of the displacement sensor and force sensor.

[0097] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0098] In the description of this application, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or that are inherent to such process, method, product, or apparatus.

[0099] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A concrete strength testing device, characterized in that, It includes a housing and a guide sleeve, wherein the guide sleeve and the housing are elastically connected; A force sensor and a displacement sensor are spaced apart inside the housing. A probe is provided in the guide sleeve. The end of the probe away from the housing passes through the guide sleeve, and the end of the probe close to the housing is connected to the force sensor. The force sensor is configured to detect the penetration force of the probe into the concrete, and the displacement sensor is configured to detect the compressive displacement of the guide sleeve during the probe penetration process. The strength of the concrete is the ratio of the penetration force to the penetration depth of the probe, wherein the penetration depth is the compressive displacement of the guide sleeve.

2. The concrete strength testing device according to claim 1, characterized in that, It also includes an elastic element, which is disposed between the guide sleeve and the housing, and its two ends respectively abut against the guide sleeve and the housing. The guide sleeve is elastically connected to the housing through the elastic element.

3. The concrete strength testing device according to claim 2, characterized in that, It also includes a connecting shaft that connects the guide sleeve and the housing, the elastic element being sleeved on the outside of the connecting shaft, and the probe being connected to the force sensor through the connecting shaft.

4. The concrete strength testing device according to claim 3, characterized in that, It also includes a guide bearing; the guide bearing connects the guide sleeve and the connecting shaft, and is sleeved on the outside of the probe.

5. The concrete strength testing device according to claim 4, characterized in that, It also includes a protective housing, which connects the guide bearing and the housing, and the elastic element is located in the protective housing; The radial dimension of the protective shell is greater than the dimension of the guide sleeve but less than the radial dimension of the housing.

6. The concrete strength testing device according to any one of claims 1-5, characterized in that, The guide sleeve is provided with a probe clamp, which fixes the probe. The concrete strength testing device also includes a locking screw, which secures the probe clamp.

7. The concrete strength testing device according to any one of claims 1-5, characterized in that, The displacement sensor includes a laser displacement sensor, and a reflector is provided on the guide sleeve; The displacement sensor is configured to emit a laser beam to the reflector and receive the reflected light signal.

8. The concrete strength testing device according to any one of claims 1-5, characterized in that, The housing is also equipped with a temperature sensor, and the force sensor, the displacement sensor and the temperature sensor are arranged at intervals along the radial direction of the housing. The temperature sensor is configured to monitor the temperature of the concrete.

9. The concrete strength testing device according to any one of claims 1-5, characterized in that, A handle is provided at the bottom of the housing, and a probe box is placed in the handle; And / or, the housing contains a motherboard and a battery, and along the direction from the guide sleeve to the housing, the force sensor, the motherboard, and the battery are arranged in sequence at intervals.

10. The concrete strength testing device according to any one of claims 1-5, characterized in that, The housing includes an upper shell and a lower shell, with the upper shell covering the lower shell; The force sensor and the displacement sensor are located in the lower shell. The upper shell is equipped with a touch screen and buttons. The lower shell has a charging port and an indicator light on the side away from the guide sleeve.

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