Rotary penetration foam concrete compressive strength detection device and method

Abstract

The present invention relates to the technical field of building material strength testing, and discloses a rotary penetration type foam concrete compressive strength testing device and method, which includes a housing, a magnet block, an energized slide rail, a sliding module, a controller, a power supply module, a distance sensor, a torque sensor, and a limit switch. The energized slide rail is installed on the housing, and both ends of the sliding module are respectively slidably connected to the energized slide rail. The torque sensor is installed on the sliding module, the distance sensor is installed on the lower end of the housing and corresponds to the sliding module, the limit switch is installed on the upper end of the housing and corresponds to the sliding module, the magnet block is located on both sides of the sliding module, the distance sensor, the torque sensor, and the limit switch are all connected to the controller, and the sliding module and the energized slide rail are both connected to the controller via the power supply module. The present invention realizes adjustable penetration force, good accuracy of detection results when the strength is small or large, and relatively easy rotational penetration.

Description

Technical Field

[0001] The present invention relates to the technical field of building material strength testing, and in particular to a rotary penetration type foam concrete compressive strength testing device and method. Background Art

[0002] According to JG / T 266-2011 "Foamed Concrete" and JGJ / T 341-2014 "Technical Specifications for the Application of Foamed Concrete," foamed concrete refers to lightweight, microporous concrete produced by physically preparing a foaming agent into foam. The foam is then added to a slurry consisting of cement, aggregate, admixtures, additives, and water. The mixture is then mixed, poured, and cured to form the resultant product. The compressive strength of foamed concrete ranges from 0.2 MPa to 30 MPa, a wide range. Testing is typically performed in the laboratory using a pressure testing machine. Currently, there is no device or method that can simultaneously test the compressive strength of foamed concrete both indoors and on-site.

[0003] The penetration method is a method of testing the compressive strength of component materials by measuring the penetration depth of steel nails. It is mainly used to test the compressive strength of masonry mortar. The tested masonry mortar strength range is between 0.4MPa and 16MPa. The existing penetration device is loaded by releasing the compressed working spring. The maximum penetration force of the detector depends on the elastic limit of its internal spring. After the spring has been used for a certain number of times, its spring limit will be attenuated or even fail, resulting in the penetration force being unable to meet the testing requirements. In addition, according to JGJ / T Taking 136-2017 "Technical Specification for Penetration Method for Testing Compressive Strength of Masonry Mortar" as an example, since the penetration force provided by the penetrometer spring is a fixed value, it can be seen from the masonry mortar compressive strength conversion table in Appendix D that: when the strength grade of the building material to be tested is relatively low, the penetration depth range corresponding to the same strength value is estimated to be relatively large, so the detection accuracy is insufficient. For example, for 0.4MPa on-site mixed cement mortar, the estimated penetration depth is 16.6mm~18.6mm; at the same time, it is difficult to obtain a sufficiently high penetration force by using the method of using spring compression to generate elastic force, and the direct penetration The loading method loses penetration force faster when encountering high-strength materials. Therefore, when the strength grade of the building material to be tested is relatively high, the strength value estimated by a small change in the penetration depth value will change significantly. For example, the strength value estimated by a penetration depth of 3.2mm for on-site mixed cement mortar is 15.0MPa, while the strength value estimated by a penetration depth of 3.1mm is 16.1MPa. A change of 0.1mm in the penetration depth value results in a change of 1.1MPa in the strength value. This places excessively high demands on the measurement accuracy of the penetration depth, which is difficult to achieve in actual projects, resulting in poor detection accuracy of high-strength materials.

[0004] In addition, after each test of the existing penetrometer is completed, it is necessary to manually use the force lever to hang the hook before the next test can be carried out, and only single-point measurement can be completed; after the penetration is completed, the penetration depth meter needs to be manually inserted into the measuring hole to measure the penetration depth. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a rotary penetration type foam concrete compressive strength detection device and method.

[0006] The objectives of the present invention are achieved through the following technical solutions: A rotary penetration foam concrete compressive strength detection device includes a shell, a magnet block, an energized slide rail, a sliding module, a controller, a power supply module, a distance sensor, a torque sensor and a limit switch, wherein the energized slide rail is installed on the shell, and the two ends of the sliding module are respectively slidably connected to the energized slide rail, the torque sensor is installed on the sliding module, the distance sensor is installed at the lower end of the shell and corresponds to the sliding module, the limit switch is installed at the upper end of the shell and corresponds to the sliding module, the magnet block is located on both sides of the sliding module, the distance sensor, the torque sensor and the limit switch are all connected to the controller, and the sliding module and the energized slide rail are both connected to the controller through the power supply module.

[0007] A better choice is that the sliding module includes a conductive slider, a U-shaped insulating block, a guide block, a cylindrical insulating shell, a rotor and a rotating penetration rod, the two ends of the conductive slider are respectively slidingly connected to the energized slide rail, the cylindrical insulating shell is slidingly connected to the energized slide rail through the guide block, the conductive slider is connected to the cylindrical insulating shell through the U-shaped insulating block, the rotor is rotatably connected to the cylindrical insulating shell, the rotor is connected to the rotating penetration rod through the torque sensor, the guide block corresponds to the ranging sensor, and the rotor is connected to the power supply module.

[0008] A better choice is that there are multiple pairs of the powered slide rails and multiple conductive sliders, and the two ends of the multiple conductive sliders are respectively slidably connected to the multiple pairs of the powered slide rails, and the multiple pairs of the powered slide rails are horizontally linear and parallel. The two adjacent pairs of the powered slide rails are connected by a series line, and the first powered slide rail and the last powered slide rail are both connected to the power supply module.

[0009] A better choice is that the number of the powered slide rails is multiple pairs, the number of the conductive sliders is multiple pieces, the multiple conductive sliders are all sleeved on the same U-shaped insulating block, the two ends of the multiple conductive sliders are respectively connected to the multiple pairs of powered slide rails, the multiple pairs of powered slide rails are arranged longitudinally, the multiple pairs of powered slide rails are connected in series end to end, and the first powered slide rail and the last powered slide rail are both connected to the power supply module.

[0010] A better choice is that the magnet block includes a north pole parallel plate, an south pole parallel plate and a U-shaped connecting block, the north pole parallel plate and the south pole parallel plate are respectively located on both sides of the sliding module, the north pole parallel plate is connected to the south pole parallel plate through the U-shaped connecting block, the north pole parallel plate and the south pole parallel plate are parallel to each other, and the sliding module is located between the north pole parallel plate and the south pole parallel plate.

[0011] A better choice is that the shell includes an outer frame, supporting feet, a shell bottom plate, a limit plate and an insulating support frame, the supporting feet are installed at the bottom of the shell, the insulating support frames are respectively installed on the inner side of the shell, the powered slide rails are connected to the inner side of the insulating support frame, the limit plate is installed on the insulating support frame, the two ends of the limit plate are respectively used to connect to the upper end of the insulating support frame, the limit plate limits the sliding module, the shell bottom plate is connected to the lower end of the insulating support frame, the shell bottom plate is provided with a through hole, the through hole corresponds to the sliding module, and the ranging sensor is installed on both sides of the through hole.

[0012] A method for testing the compressive strength of foam concrete by rotary penetration comprises the following steps:

[0013] S1. Using the same raw materials, process and curing conditions, make standard test blocks for foam concrete of various strength grades;

[0014] S2. Conducting conventional compressive strength tests and rotary penetration depth tests on standard test blocks of various strength grades obtained in step S1, respectively, to obtain a calculation formula for a change gradient k, which is k=Δf / Δm, where Δf is the difference value of the conventional compressive strength representative value f, and Δm is the difference value of the rotary penetration depth representative value m;

[0015] S3. Divide each intensity level in step S1 into multiple intensity intervals, where each intensity interval corresponds to the penetration thrust Fa, the rotational torque Tb, and the power supply duration t, respectively, so that the k value of each intensity interval falls within a value range, and establish a respective intensity measurement curve regression equation for each intensity interval;

[0016] S4. Assemble a rotary penetration device, place foam concrete into the rotary penetration device, and align the sliding module of the rotary penetration device with the foam concrete. The rotary penetration device is a rotary penetration foam concrete compressive strength testing device described in this application.

[0017] S5, reset the sliding module to return to the initial position;

[0018] S6. Input the penetration thrust Fa, rotation torque Tb, and power supply duration t determined in the intensity range according to step S3, and start the test;

[0019] S7, the controller controls the rotary penetration device to complete the penetration detection of the foam concrete, and the ranging sensor uploads the maximum penetration depth value to the controller;

[0020] S8. The maximum penetration depth value of step S7 is used to estimate the strength value of the foamed concrete through the strength curve regression equation of step S3.

[0021] For a better choice, the value range of the change gradient k is 0.5~2.

[0022] A better choice is that the number of intensity intervals in step S3 is ≥3.

[0023] More preferably, the strength levels of step S1 include 0.2 MPa, 0.3 MPa, 0.5 MPa, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 7.5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa and 30 MPa.

[0024] The present invention has the following advantages and beneficial effects compared to the prior art:

[0025] The present invention provides a rotary penetration foam concrete compressive strength testing device and method that uses an Ampere force-based rotary penetration method to test the compressive strength of foam concrete of various strength grades, thereby achieving adjustable penetration force, good accuracy of test results when the strength is small or large, and relatively easy rotary penetration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the electronic components connection of a rotary penetration type foam concrete compressive strength testing device of the present invention;

[0027] Figure 2 This is a front view of a rotary penetration type foam concrete compressive strength testing device of the present invention;

[0028] Figure 3 This is a front view of the internal structure of a rotary penetration type foam concrete compressive strength testing device of the present invention;

[0029] Figure 4 It is a schematic diagram of a rotary penetration type foam concrete compressive strength testing device of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of a rotary penetration type foam concrete compressive strength testing device of the present invention;

[0031] Figure 6This is an exploded view of some components of a rotary penetration type foam concrete compressive strength testing device of the present invention;

[0032] Figure 7 Schematic diagram of a rotary penetration foam concrete compressive strength testing device (Example 2) of the present invention;

[0033] Figure 8 Schematic diagram of a rotary penetration foam concrete compressive strength testing device (Example 3) of the present invention;

[0034] The markings of the components in the accompanying drawings are as follows: 1-housing; 101-outer frame; 102-supporting foot; 103-housing bottom plate; 1031-through hole; 104-limiting plate; 105-insulating support frame; 2-magnet block; 3-powered slide rail; 4-sliding module; 401-conductive slider; 402-U-shaped insulating block; 403-guide block; 404-cylindrical insulating shell; 405-rotor; 4051-armature; 406-rotating penetration rod; 5-distance sensor; 6-torque sensor; 7-limit switch; 8-series line. DETAILED DESCRIPTION

[0035] The purpose of the present invention is described in further detail below with reference to the accompanying drawings and specific examples. The examples cannot be described one by one here, but the implementation methods of the present invention are not limited to the following examples.

[0036] Example 1

[0037] like Figures 1 to 6As shown, a rotary penetration foam concrete compressive strength testing device includes a housing 1, a magnet block 2, two powered slide rails 3, a sliding module 4, a controller, a power supply module, two distance sensors 5, and a torque sensor 6; the power supply module includes a first power supply module and a second power supply module; the housing 1 includes two insulating support frames 105, a limit plate 104, an outer frame 101, a housing bottom plate 103, and two support legs 102. The two ends of the bottom of the outer frame 101 are connected by the housing bottom plate 103, and the two inner sides of the outer frame 101 are respectively connected to the two support legs 102. The two insulating support frames 105 are respectively connected to the inner walls of the outer frame 101 and are installed on the top of the housing bottom plate 103. The upper ends of the two insulating support frames 105 are connected by a limit plate 104. The two powered slide rails 3 are respectively installed on the inner sides of the two insulating support frames 105, and the two powered slide rails 3 are parallel to each other. The ends of the sliding module 4 are embedded in the grooves of the two powered rails 3. The sliding module 4 can slide relative to the two powered rails 3, and the top of the sliding module 4 is limited by the limit plate 104. The torque sensor 6 is installed between the rotor 405 of the sliding module 4 and the rotary penetration rod 406. A through hole 1031 is provided in the middle of the housing bottom plate 103. This through hole 1031 is used for the rotary penetration rod 406 to pass through. Distance sensors 5 are provided on both sides of this through hole 1031. The two distance sensors 5 correspond to the two guide blocks 403 of the sliding module 4. The first power supply module is connected to the two powered rails 3 respectively. The conductive slider 401 of the sliding module 4 slides under the action of the Ampere force under the action of the magnetic field. The second power supply module is electrically connected to the rotor 405 of the sliding module 4. The first power supply module, the second power supply module, the distance sensor 5, and the torque sensor 6 are all connected to the controller.

[0038] The outer casing 1 protects the internal components and provides insulation. The insulating support frame 105 primarily secures and isolates the powered slide rail 3. The limit plate 104 limits the upward movement of the slide module 4. When the slide module 4 reaches its highest sliding position, the limit switch 7 locks the slide module 4. The outer frame 101 is made of an insulating hard material (such as epoxy resin or polycarbonate) and serves as a support and insulator, securing the various components. The outer casing base 103 allows the sliding module 4's rotary penetration rod 406 to pass through and mount the distance sensor 5, and also supports the insulating bracket. The support legs 102 support the outer frame 101, maintaining a certain height above the ground for easy handling. The magnet block 2 provides a uniform magnetic field and can be made of a permanent magnet or an electromagnet. The powered slide rail 3 supplies power to the slide module 4 and provides guidance. The slide module 4 is designed to move longitudinally and is capable of rotary penetration of a standard test block. The controller is a computer that receives signals from the distance sensor 5, the torque sensor 6, and the limit switch 7, and can control the movement of the conductive slider 401 and the movement of the rotor 405. The power supply module is used to provide electrical energy to the conductive slider 401 and the rotor 405. The distance sensor 5 can measure the displacement of the sliding module 4 in real time. When the rotating penetration rod 406 just contacts the surface of the standard test block, the distance measured by the distance sensor 5 is defined as 0, and the upward direction of the rotating penetration rod 406 is negative and the downward direction is positive. The torque sensor 6 is used to detect the torque of the rotor 405. The first power supply module is used to provide energy to the conductive slider 401 and control its movement. The second power supply module is used to provide electrical energy to the rotor 405 and control its movement.

[0039] The sliding module 4 includes a conductive slider 401, a U-shaped insulating block 402, two guide blocks 403, a cylindrical insulating shell 404, a rotor 405 and a rotating penetration rod 406. The two ends of the conductive slider 401 are respectively slidably connected to the two energized slide rails 3. The U-shaped insulating block 402 is fixedly sleeved on the middle part of the guide block 403. The bottom of the U-shaped insulating block 402 is fixedly connected to the top of the cylindrical insulating shell 404. The left and right sides of the cylindrical insulating shell 404 are respectively connected to the two guide blocks 403, and the two guide blocks 403 are respectively slidably connected to the two energized slide rails 3. The rotor 405 is rotatably mounted in the cylindrical insulating shell 404. An armature 4051 is provided on the rotor 405. The rotating shaft of the rotor 405 is connected to the rotating penetration rod 406 through the torque sensor 6. The armature 4051 on the rotor 405 is connected to the second power supply module of the power supply module, and the rotor 405 rotates under the action of the uniform magnetic field.

[0040] Conductive slider 401 drives the rotary penetration rod 406 vertically. The square-shaped insulating block 402 provides insulation and connects to the cylindrical insulating housing 404. Guide block 403 guides the longitudinal movement of the rotary penetration rod 406. The cylindrical insulating housing 404 houses the rotor 405 and provides insulation. The rotor 405, in conjunction with the magnet block 2, drives the rotary penetration rod 406. The rotary penetration rod 406 is used to perform rotary penetration of a standard test block.

[0041] The magnet block 2 includes a north-pole parallel plate, a south-pole parallel plate, and a U-shaped connecting block. The north-pole parallel plate and the south-pole parallel plate are located on the front and rear sides of the sliding module 4, respectively. The north-pole parallel plate is connected to the south-pole parallel plate via the U-shaped connecting block. The north-pole parallel plate and the south-pole parallel plate are parallel to each other. A uniform magnetic field exists between the north-pole and south-pole parallel plates, with the north pole pointing to the south pole.

[0042] Working process description of the rotary penetration foam concrete compressive strength testing device:

[0043] Step 1: In the initial state, the sliding module 4 is at the uppermost end of the energized slide rail 3 and the limit switch 7 locks it; input the penetration thrust F into the computer. a , whose value depends on the current value I provided by the first power supply module a , input rotation torque T b , whose value depends on the current value I provided by the second power supply module b , input the power supply duration t value;

[0044] Step 2: After the parameters are input, the test begins. The controller first controls the second power supply module to provide a current value I to the rotor 405. b The rotor 405 rotates under the magnetic field provided by the magnet block 2. The controller obtains the torque of the rotor 405 through the signal of the torque sensor 6. The controller controls the rotor 405 to rotate at a constant torque. After the torque stabilizes, the controller simultaneously controls the limit switch 7 to unlock and the first power supply module to provide a current value I to the conductive slider 401. a The conductive slider 401 is driven by the Ampere force in the magnetic field to drive the sliding module 4 to move longitudinally downward. The controller obtains the movement position of the sliding module 4 through the signal of the distance sensor 5. When the rotating penetration rod 406 contacts the surface of the standard test block, that is, the distance measured by the distance sensor 5 is 0, the controller starts to calculate the power supply time and controls the power supply modules (including the first power supply module and the second power supply module) to cut off the power when the power supply time is t. The test automatically stops after stabilization.

[0045] Step 3: After the inspector determines that the measured data is normal, he controls the sliding module 4 to reset through the controller. The first power supply module provides a reverse current value I0 to ensure that the sliding module 4 rises slowly and evenly back to the initial position. The limit switch 7 locks the sliding module 4 and automatically cuts off the power.

[0046] A method for testing the compressive strength of foam concrete by rotary penetration comprises the following steps:

[0047] S1. Using the same raw materials, process and curing conditions, make multiple sets of standard test blocks with a side length of 100 mm for foam concrete of various strength grades (including 0.2 MPa, 0.3 MPa, 0.5 MPa, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 7.5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa and 30 MPa).

[0048] S2. Conduct traditional compressive strength tests and rotary penetration depth tests on foam concrete of various strength grades simultaneously.

[0049] The traditional compressive strength test can obtain the representative value of compressive strength f (unit: MPa), and the rotary penetration depth test can obtain the representative value of penetration depth m (unit: mm). The value of m depends on the current value I used. a , current value I b , the power supply duration t, the value of which is determined through experiments and must satisfy the value range of 0.5~2 for the gradient of f changing with m obtained for concrete of various strength grades, k=Δf / Δm. In this way, the representative value of compressive strength f can be accurately estimated after the representative value of penetration depth m is measured by the rotary penetration method, where Δf is the difference value of the traditional compressive strength representative value f, and Δm is the difference value of the representative value of rotary penetration depth m.

[0050] S3. In actual operation, due to the large span of 0.2MPa~30MPa, it is impossible to use the same current value I a , power value I b When the value range of k falls between 0.5 and 2, the intensity level of step S1 can be divided into multiple intensity intervals, and the number of intensity intervals is ≥3. Each intensity interval uses the corresponding current value I a , power value I b and the power supply duration t, the value range of k in each intensity interval falls between 0.5 and 2, and further, the strength measurement curve regression equation is established for each intensity interval.

[0051] S4. Assemble the rotary penetration type foam concrete compressive strength testing device, place the foam concrete into the rotary penetration device, and align the rotary penetration rod 406 of the sliding module 4 of the rotary penetration device with the measuring point of the foam concrete;

[0052] S5. Check whether the sliding module 4 is in the initial position (i.e., at the uppermost end of the energized slide rail 3 and the limit switch 7 locks the sliding module 4). If not, reset the sliding module 4 to return to the initial position.

[0053] S6: Input the penetration thrust F determined in each intensity interval according to step S3. a (Its value depends on the current value I a )、Rotational torque T b (Its value depends on the current value I b ) and power supply duration t, start the test;

[0054] S7, the controller controls the rotary penetration type foam concrete compressive strength testing device to complete the penetration test of the foam concrete, obtains the maximum penetration depth value, and the ranging sensor 5 uploads the maximum penetration depth value to the controller;

[0055] S8. The maximum penetration depth value of step S7 is used to estimate the strength value of the foamed concrete through the strength curve regression equation of step S3.

[0056] In order to address the problems of narrow strength detection range, insufficient detection accuracy when the strength is small or large, and difficulty in direct penetration caused by the fixed and non-adjustable penetration force of traditional penetrometers, this embodiment adopts a rotary penetration method based on Ampere force to detect the compressive strength of foam concrete of different strength grades, so as to achieve adjustable penetration force, good accuracy of detection results when the strength is small or large, and relatively easy rotary penetration.

[0057] Example 2

[0058] Except for the following technical features, other technical features in this embodiment are the same as those in the first embodiment.

[0059] like Figure 7 As shown, there are four powered rails 3, which are arranged in sequence from left to right, and the four powered rails 3 are parallel to each other. The top of the first powered rail 3 and the top of the fourth powered rail 3 are respectively connected to the positive and negative poles of the first power supply module through wires. The second powered rail 3 and the third powered rail 3 are connected through wires. The default magnetic field fully covers the conductive slider 401 and its movement path; after power is turned on, the current value I of the conductive slider 401 between the first powered rail 3 and the second powered rail 3, and between the third powered rail 3 and the fourth powered rail 3 a If the two channels are the same, the Ampere force they are subjected to is the same, and dual-channel synchronous testing can be achieved under the same conditions; for multiple channels, please refer to the dual-channel settings.

[0060] In order to solve the problem that traditional penetrometers manually use a force lever to hang the hook and manually measure the penetration depth, and can only complete single-point measurement in one test, this embodiment realizes mechanical penetration, resetting, and penetration depth measurement through structural design, the Ampere force principle and sensor control, and can realize synchronous multi-channel and multi-point measurement under the same conditions, saving manpower and improving work efficiency.

[0061] Example 3

[0062] Except for the following technical features, other technical features in this embodiment are the same as those in the first embodiment.

[0063] To achieve the current value I a Under the condition of no change, the sliding module 4 can obtain a greater Ampere force, and the design of the sliding module 4 can be further optimized. Figure 8 As shown, the number of conductive sliders 401 embedded in the square-shaped insulating block 402 is replaced by one, with four. Accordingly, the number of pairs of powered rails 3 is replaced by four, with one pair. The four pairs of powered rails 3 are arranged in a front-to-back sequence, and adjacent pairs of powered rails 3 are connected end-to-end via a series connection 8. Both the first and last powered rails 3 are connected to the first power supply module. When energized, the force applied to the square-shaped insulating block 402 increases fourfold compared to the technical solution of Example 1, achieving greater penetration force with lower current input.

[0064] The above specific implementation manner is a preferred embodiment of the present invention and does not limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A rotary penetration foam concrete compressive strength testing device, characterized by: The device comprises a housing, a magnet block, an energized slide rail, a sliding module, a controller, a power supply module, a distance sensor, a torque sensor, and a limit switch. The energized slide rail is mounted on the housing, and both ends of the sliding module are respectively slidably connected to the energized slide rail. The torque sensor is mounted on the sliding module, and the distance sensor is mounted on the lower end of the housing and corresponds to the sliding module. The limit switch is mounted on the upper end of the housing and corresponds to the sliding module. The magnet block is located on both sides of the sliding module. The distance sensor, the torque sensor, and the limit switch are all connected to the controller. The sliding module and the energized slide rail are both connected to the controller via the power supply module. The sliding module includes a conductive slider, a square-shaped insulating block, a guide block, a cylindrical insulating shell, a rotor and a rotary penetration rod. The two ends of the conductive slider are respectively slidably connected to the energized slide rail, the cylindrical insulating shell is slidably connected to the energized slide rail through the guide block, the conductive slider is connected to the cylindrical insulating shell through the square-shaped insulating block, the rotor is rotatably connected to the cylindrical insulating shell, the rotor is connected to the rotary penetration rod through the torque sensor, the guide block corresponds to the distance sensor, and the rotor is connected to the power supply module; The magnet block includes a north pole parallel plate, an south pole parallel plate and a U-shaped connecting block. The north pole parallel plate and the south pole parallel plate are respectively located on both sides of the sliding module. The north pole parallel plate is connected to the south pole parallel plate through the U-shaped connecting block. The north pole parallel plate and the south pole parallel plate are parallel to each other. The sliding module is located between the north pole parallel plate and the south pole parallel plate.

2. The rotary penetration foam concrete compressive strength testing device according to claim 1, characterized in that: There are multiple pairs of powered slide rails and multiple conductive sliders. The two ends of the multiple conductive sliders are respectively slidably connected to the multiple pairs of powered slide rails. The multiple pairs of powered slide rails are horizontally linear and parallel. Two adjacent pairs of powered slide rails are connected by a series line. The first powered slide rail and the last powered slide rail are both connected to the power supply module.

3. The rotary penetration foam concrete compressive strength testing device according to claim 1, characterized in that: There are multiple pairs of the powered slide rails, and there are multiple conductive sliders. The multiple conductive sliders are all sleeved on the same U-shaped insulating block. The two ends of the multiple conductive sliders are respectively connected to the multiple pairs of powered slide rails. The multiple pairs of powered slide rails are arranged longitudinally and connected in series end to end. The first powered slide rail and the last powered slide rail are both connected to the power supply module.

4. The rotary penetration foam concrete compressive strength testing device according to claim 1, characterized in that: The shell includes an outer frame, supporting feet, a shell bottom plate, a limit plate and an insulating support frame. The supporting feet are installed at the bottom of the shell. The insulating support frames are respectively installed on the inner side of the shell. The powered slide rails are connected to the inner side of the insulating support frame. The limit plate is installed on the insulating support frame. The two ends of the limit plate are respectively used to connect to the upper end of the insulating support frame. The limit plate limits the sliding module. The shell bottom plate is connected to the lower end of the insulating support frame. The shell bottom plate is provided with a through hole, which corresponds to the sliding module. The ranging sensor is installed on both sides of the through hole.

5. A method for testing the compressive strength of foamed concrete by rotary penetration, characterized in that: The following steps are involved: S1. Using the same raw materials, process and curing conditions, make standard test blocks for foam concrete of various strength grades; S2. Conducting conventional compressive strength tests and rotary penetration depth tests on standard test blocks of various strength grades obtained in step S1, respectively, to obtain a calculation formula for a change gradient k, which is k=Δf / Δm, where Δf is the difference value of the conventional compressive strength representative value f, and Δm is the difference value of the rotary penetration depth representative value m; S3. Divide each intensity level in step S1 into multiple intensity intervals, where each intensity interval corresponds to the penetration thrust Fa, the rotational torque Tb, and the power supply duration t, respectively, so that the k value of each intensity interval falls within a value range, and establish a respective intensity measurement curve regression equation for each intensity interval; S4. Assemble a rotary penetration device, place foam concrete into the rotary penetration device, and align the sliding module of the rotary penetration device with the foam concrete, wherein the rotary penetration device is a rotary penetration foam concrete compressive strength testing device according to any one of claims 1 to 4; S5, reset the sliding module to return to the initial position; S6. Input the penetration thrust Fa, rotation torque Tb, and power supply duration t determined in the intensity range according to step S3, and start the test; S7, the controller controls the rotary penetration device to complete the penetration detection of the foam concrete, and the ranging sensor uploads the maximum penetration depth value to the controller; S8. The maximum penetration depth value of step S7 is used to estimate the strength value of the foamed concrete through the strength curve regression equation of step S3.

6. A rotary penetration foam concrete compressive strength testing method according to claim 5, characterized in that: The value range of the change gradient k is 0.5~2.

7. A rotary penetration foam concrete compressive strength testing method according to claim 5, characterized in that: The number of intensity intervals in step S3 is ≥3.

8. A rotary penetration foam concrete compressive strength testing method according to claim 5, characterized in that: The strength grades of step S1 include 0.2 MPa, 0.3 MPa, 0.5 MPa, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 7.5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa and 30 MPa.

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