Concrete test block strength detection equipment and detection method

Abstract

The invention relates to concrete test block strength detection equipment and a detection method. The concrete test block strength detection equipment comprises a mounting frame, a loading device, a detection table, a clamping and limiting mechanism and a controller, a plurality of groups of strain gauges are uniformly arranged on the detection table; the clamping limiting mechanism comprises a lifting sliding block, a translation sliding rail, a translation sliding block, a hinge rod, a sliding rod, an abutting head and an electric control locking piece. A hinge rod is hinged between the translation sliding block and the lifting sliding block, so that the translation sliding block moves left and right along with the lifting movement of the lifting sliding block; the sliding rod is arranged on the translation sliding block in a sliding mode, an electric control locking piece is arranged on the translation sliding block, and the electric control locking piece can lock the sliding rod so that the sliding rod can be fixedly connected with the translation sliding block; when the strain gauge detects that the stress reaches a threshold value, the electric control locking piece is unlocked, and the sliding rod and the translation sliding block are converted into sliding connection from fixed connection, so that lateral limiting on the test block is relieved.

Description

Technical Field

[0001] This invention relates to the field of concrete testing technology, specifically to a concrete test block strength testing device and testing method. Background Technology

[0002] The compressive strength of concrete is one of the core indicators for evaluating its mechanical properties. To accurately determine the compressive strength of concrete, a compression testing machine is typically used to conduct a loading failure test on standard-sized concrete specimens. During the test, the compressive strength of the concrete material is calculated by examining the bearing capacity of the specimen from compression to failure.

[0003] Existing concrete compressive strength testing equipment generally includes a loading device at the top, a test block bearing platform (testing table) at the bottom, and clamps or limiting structures around the platform. Before the test, the operator places the test block in the center of the testing table and uses the clamping devices or limiting blocks around the platform to laterally limit and position the test block, ensuring that the test block is quickly and accurately centered on the testing table and preventing the test block from tilting or tipping over during loading.

[0004] However, due to the Poisson effect, as the loading force on the top of the specimen gradually increases, the specimen will expand laterally due to compressive deformation. The clamps or limiting blocks will create lateral restraint forces, causing the stress state of the specimen to deviate from the ideal uniaxial compression condition. This results in uneven stress distribution within the specimen, artificially high local compression, and deviations in test results, affecting the accuracy of compressive strength data. For example, without lateral restraint, typical splitting failure (45° diagonal) will occur. With peripheral restraint, the specimen's belly may bulge but be restrained, while the top or bottom edges may split or even burst, leading to failure modes that do not conform to standard specifications.

[0005] Therefore, it is necessary to study a concrete specimen strength testing device. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide a concrete test block strength testing device and testing method, which can effectively solve the problem of stress interference caused by setting a lateral limiting structure on existing pressure testing equipment.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A concrete test block strength testing device includes a mounting frame, a loading device, a testing table, a clamping and limiting mechanism, and a controller; The testing platform is installed at the lower part of the mounting frame, and multiple sets of strain gauges are evenly arranged on the testing platform; The loading device is installed on the upper part of the mounting frame and includes at least a power unit and a loading head. The loading head is positioned directly above the testing table by the power unit and is used to apply pressure to the test block. The clamping and limiting mechanism is located above the testing table and symmetrically distributed around the perimeter of the testing table. The clamping and limiting mechanism includes a lifting slider, a translational slide rail, a translational slider, a hinge rod, a slide bar, an abutment joint, and an electrically controlled locking component. The lifting slider is vertically mounted on the mounting frame via a lifting mechanism; The translation slide rail is horizontally fixed on the mounting frame and faces the testing table; The translation slider is slidably mounted on the translation slide rail, and a hinge rod is hinged between the translation slider and the lifting slider, so that the translation slider moves left and right as the lifting slider moves up and down. The translation slider has a through hole, the slide rod is slidably disposed in the slide hole, and the end of the slide rod facing the detection table is fixedly connected to an abutment. The translation slider is equipped with an electrically controlled locking component, which can lock the slider rod so that the slider rod is fixedly connected to the translation slider. The controller is connected to the power unit, strain gauge, electronic locking device and lifting mechanism. When the strain gauge detects that the stress reaches the threshold, the electronic locking device unlocks, and the slide rod and the translation slider change from a fixed connection to a sliding connection, so that the abutment releases the lateral limit on the test block.

[0008] Furthermore, the electrically controlled locking component includes a ring electromagnet and an adsorption armature; The annular electromagnet is fixed to the end of the translation slider away from the detection table and is wrapped around the slider rod; The adsorption armature is fixed at the end of the slide bar away from the detection stage; The annular electromagnet is connected to the controller. When the annular electromagnet is energized, it is attracted and fixed to the armature, thus fixing the slide bar and the translation slider together.

[0009] Furthermore, a reset abutment is vertically fixed at the end of the translation slide rail away from the detection table. When the translation slider moves to its maximum distance from the detection table, the reset abutment limits the translation slider and makes the annular electromagnet fit with the adsorption armature.

[0010] Furthermore, a return spring is sleeved between the slide rod and the annular electromagnet, and the return spring is abutting between the translation slider and the adsorption armature. When the annular electromagnet is in contact with the adsorption armature, the return spring is compressed and stores elastic force; when the annular electromagnet is de-energized, the return spring forces the slide bar to retract and moves the abutment away from the test block.

[0011] Furthermore, the mounting frame includes a top frame, a bottom frame, and a clamp frame that are fixedly connected; The loading device is mounted on the top frame, the testing platform is fixed on the base frame, and the clamping and limiting mechanism is mounted on the fixture frame.

[0012] Furthermore, the fixture frame is fixed at intervals above the testing table, and a test block slot is provided in the middle of the fixture frame to avoid the test block. The lower surface of the fixture frame is provided with an air jet head facing the testing table to purge the upper surface of the testing table. The air jet head is connected to the air supply system pipeline and is controlled by the controller.

[0013] Furthermore, the lifting mechanism includes a lifting slide, a lifting screw, and a control motor; The lifting slide is fixed on the mounting frame. The lifting screw is vertically rotatably mounted on the lifting slide, and one end of the lifting screw is connected to a control motor, which is connected to a controller. The lifting slider is threadedly connected to the lifting screw and slidably connected to the lifting slide block.

[0014] A method for testing the strength of concrete test blocks, applied to the aforementioned concrete test block strength testing equipment, includes the following steps: S1: Place the test block; Air is blown from the jet head to clean the testing table; the test block is placed in the center of the testing table; the electronic locking mechanism keeps it locked, so that the slide rod is fixedly connected to the translation slider; S2: Preload; Each lifting slider moves down synchronously, causing each translation slider to move synchronously toward the center of the testing platform, so as to limit and clamp the test block in the center of the testing platform; The loading head is moved down to abut against the top of the test block, and pressure is gradually applied; S3: Automatic unlock; When the strain gauge detects that the pressure has reached the pre-tightening threshold, the electronically controlled locking device unlocks, and the sliding rod and the translation slider change from a fixed connection to a sliding connection, so that the abutment releases the lateral restraint on the test block; S4: Free loading; The loading head continuously applies pressure to the test block through the power unit until the test block breaks; S5: Breakage detection; The specimen broke, the strain gauge detected a sudden pressure change, and the loading device stopped applying pressure. S6: Reset; Each lifting slider moves upward synchronously, causing each translation slider to move away from the testing platform synchronously until the translation slider abuts against the reset abutment seat, causing the slide bar to return to the initial position relative to the horizontal slider, and then the electronic locking device locks.

[0015] The beneficial effects of the above technical solution are: (1) The present invention utilizes a clamping and limiting mechanism to clamp and limit the test block, wherein the sliding rod and the translation slider are connected by switching the opening and closing of the electronically controlled locking component; during the pre-tightening loading stage, the electronically controlled locking component is locked so that the sliding rod and the translation slider are fixedly connected, so that the abutment joint forms a clamping and limiting effect on the side of the test block, ensuring the positioning accuracy of the test block in the initial loading stage; multiple strain gauges are evenly arranged on the testing platform to detect the actual longitudinal pressure on the test block in real time. When the actual longitudinal pressure on the test block reaches the threshold, the electronically controlled locking component is unlocked, so that the sliding rod and the translation slider are slidably connected, releasing the lateral limiting effect of the abutment joint on the test block, allowing the abutment joint to retract under the reaction force of the lateral expansion of the test block, so that the test block can be in a free compression state during the formal loading stage, avoiding the additional lateral constraint force generated on the test block by the existing fixed limiting structure during the loading process, fundamentally eliminating the stress interference and force deviation problems caused by constraint, and ensuring that the stress state of the test block meets the uniaxial compression conditions required by the standard.

[0016] (2) The present invention has a hinged rod connecting the translation slider and the lifting slider, so that the translation slider moves left and right with the lifting slider. The end of the translation slide rail away from the test table is vertically fixed with a reset abutment seat. When the translation slider moves away from the test table to the maximum stroke, the reset abutment seat set at the end of the translation slide rail away from the test table mechanically limits the translation slider and makes the slide rod return to the initial position relative to the horizontal slider, ensuring that each abutment returns to the same initial position after reset, and ensuring that the symmetrically distributed clamping and limiting mechanism re-forms precise centering constraint when clamping the test block again; and at this time, the annular electromagnet at the end of the translation slider and the adsorption armature at the end of the slide rod are reliably attached, preparing the position for the next energized adsorption.

[0017] (3) The fixture frame of the present invention is fixed at intervals above the test table. The middle part of the fixture frame is provided with a test block groove to avoid the test block, which realizes the spatial design effect of high and low staggered layers and vertical connection. On the one hand, the abutment on the clamping and limiting mechanism can abut against the middle position of the side wall of the test block to realize the stable limiting and positioning of the test block. On the other hand, the interval between the fixture frame and the test table and the test block groove form an annular chip removal space and airflow channel around the test block, so that the jet head set on the lower surface of the fixture frame can effectively blow away the debris and dust on the test table and quickly remove the debris from the surface of the test table, thereby realizing the rapid cleaning of the test table. Attached Figure Description

[0018] Figure 1 This is a front view schematic diagram of the present invention; Figure 2 This is a schematic diagram of the preloaded state; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a diagram showing the state of the electronically controlled locking mechanism after it has automatically unlocked. Figure 5 for Figure 4 A magnified view of a section at point B in the middle; Figure 6 A state diagram showing the clamping and limiting mechanism resetting to its initial state; Figure 7 This is a schematic diagram of the distribution of strain gauges on the testing stage.

[0019] Reference numerals: 1. Mounting frame; 2. Loading device; 3. Testing table; 4. Clamping and limiting mechanism; 5. Lifting slider; 6. Lifting mechanism; 7. Reset abutment seat; 8. Return spring; 9. Air jet head; 10. Test block; 101. Top frame; 102. Base frame; 103. Fixture frame; 104. Test block slot; 201. Power unit; 202. Loading head; 301. Strain gauge; 401. Translation slide rail; 402. Translation slider; 403. Hinge rod; 404. Slide rod; 405. Abutment joint; 406. Electrically controlled locking component; 4061. Ring electromagnet; 4062. Adsorption armature; 601. Lifting slide seat; 602. Lifting screw; 603. Control motor. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: This embodiment aims to provide a concrete specimen strength testing device, which is mainly used for longitudinal compressive strength testing of concrete specimens, addressing the problem of stress interference caused by setting a lateral limiting structure on existing pressure testing devices.

[0021] A concrete test block strength testing device, such as Figure 1 It includes a mounting frame 1, a loading device 2, a testing platform 3, a clamping and limiting mechanism 4, and a controller.

[0022] Mounting bracket 1 is mainly used to provide an installation base, including a top frame 101, a base frame 102, and a clamp frame 103 that are fixedly connected.

[0023] The loading device 2 is installed on the upper part of the mounting frame 1, specifically on the top frame 101. It is mainly used to apply pressure to the top of the test block 10 to perform a destructive test. It primarily utilizes existing technology in concrete compressive strength testing equipment, and includes at least a power unit 201 and a loading head 202. The power unit 201 can be a hydraulic servo loading system including a cylinder, hydraulic pump station, servo valve, and force sensor, or a motor servo screw loading system including a servo motor, reducer, ball screw, preload bearing, and force sensor. Both utilize existing technology and will not be elaborated further here. It is important to note that the power unit 201 needs to be connected to a controller and be able to provide feedback on the applied pressure. The loading head 202 is positioned directly above the testing table 3, moving up and down via the power unit 201, for direct contact and compression of the test block 10.

[0024] The testing platform 3 is used to place the concrete test block 10. The testing platform 3 is installed at the lower part of the mounting frame 1, specifically fixed to the base frame 102, and located directly below the loading head 202. Figure 7 Multiple strain gauges 301 are evenly arranged on the testing platform 3. The strain gauges 301 are specifically located inside the testing platform 3. The strain gauges 301 are used to detect the pressure at different positions on the testing platform 3. Pressure sensors can also be used. Their function is different from the force sensor in the loading device 2. They mainly determine the actual pressure on the test block 10. All strain gauges 301 are connected to the controller through signal lines. When the data deviation fed back by each strain gauge 301 is within the allowable error range, it indicates that the test block 10 is subjected to uniform force.

[0025] The clamping and limiting mechanism 4 is set above the testing table 3, specifically on the fixture frame 103, and symmetrically distributed around the testing table 3. Specifically, two sets can be symmetrically distributed on the left and right, or four sets can be arranged around the test block 10. If the test block 10 is cylindrical, three sets can be arranged around the circumference. The purpose is to clamp and fix the test block 10 and limit its position in the center.

[0026] The clamping and limiting mechanism 4 includes a lifting slider 5, a translation slide rail 401, a translation slider 402, a hinge rod 403, a slide rod 404, an abutment joint 405, and an electrically controlled locking component 406. The lifting slider 5 is vertically mounted on the mounting frame 1 via the lifting mechanism 6, as shown below. Figure 1 and Figure 2In this embodiment, the lifting mechanism 6 includes a lifting slide 601, a lifting screw 602, and a control motor 603. The lifting slide 601 is fixed on the mounting frame 1, and the lifting screw 602 is vertically rotatably mounted on the lifting slide 601. One end of the lifting screw 602 is connected to the control motor 603, which is controlled by a controller. The lifting slider 5 is threadedly connected to the lifting screw 602 and slidably connected to the lifting slide 601. In other embodiments, the lifting mechanism 6 can also be an electric telescopic rod mechanism, etc., designed to control the lifting slider 5 to move up and down.

[0027] The translation slide rail 401 is horizontally fixed on the fixture frame 103 and faces the inspection table 3. The translation slider 402 is slidably set on the translation slide rail 401. The translation slider 402 and the lifting slider 5 are hingedly connected by a hinge rod 403, so that the translation slider 402 moves left and right with the lifting slider 5.

[0028] The translation slider 402 has a through hole, and the slider 404 is slidably disposed in the hole. The end of the slider 404 facing the test table 3 is fixedly connected to the abutment 405, which is used to directly contact the test block 10.

[0029] An electrically controlled locking element 406 is provided on the translation slider 402. The electrically controlled locking element 406 can lock the slide rod 404 so that the slide rod 404 is fixedly connected to the translation slider 402. When the strain gauge 301 detects that the stress reaches the threshold, the electrically controlled locking element 406 is unlocked, and the slide rod 404 and the translation slider 402 change from a fixed connection to a sliding connection, so that the abutment 405 releases the lateral restriction on the test block 10.

[0030] In this embodiment, as Figure 2 and Figure 3 The electrically controlled locking component 406 includes a ring electromagnet 4061 and an adsorption armature 4062. The ring electromagnet 4061 is fixed to the end of the translation slider 402 away from the detection stage 3 and is sleeved around the slide rod 404; the adsorption armature 4062 is fixed to the end of the slide rod 404 away from the detection stage 3; the ring electromagnet 4061 is connected to a controller, and when the ring electromagnet 4061 is energized, it is attracted and fixed to the adsorption armature 4062, so that the slide rod 404 is fixedly connected to the translation slider 402. In other embodiments, the electrically controlled locking component 406 can also be an electric caliper fixed to the translation slider 402, or an electric pin fixed to the clamp frame 103, with a corresponding insertion hole on the slide rod 404.

[0031] The end of the translation slide rail 401 furthest from the testing table 3 is vertically fixed with a reset abutment seat 7, such as... Figure 6When the translation slider 402 moves to its maximum distance from the testing stage 3, the reset abutment 7 mechanically limits the translation slider 402 and returns the slide rod 404 to its initial position relative to the horizontal slider, ensuring that each abutment 405 returns to the same initial position after reset, and ensuring that the symmetrically distributed clamping and limiting mechanisms 4 re-form precise centering constraints when clamping the test block 10 for the next time; at this time, the annular electromagnet 4061 at the end of the translation slider 402 and the adsorption armature 4062 at the end of the slide rod 404 are reliably engaged, preparing the position for the next energized adsorption.

[0032] Furthermore, a return spring 8 is sleeved between the slide rod 404 and the annular electromagnet 4061, and the return spring 8 is abutting between the translation slider 402 and the adsorption armature 4062; when the annular electromagnet 4061 and the adsorption armature 4062 are in contact, the return spring 8 is compressed and stores elastic force; such as Figure 5 When the annular electromagnet 4061 is de-energized, the return spring 8 forces the slide bar 404 to retract and causes the abutment 405 to move away from the test block 10.

[0033] The controller is connected to the power unit 201, strain gauge 301, electric locking component 406 and lifting mechanism 6. The controller is mounted on the mounting bracket 1 and can be set as a control console with screen and buttons for easy user operation. Its working principle and specific structural form adopt existing technology and will not be described in detail here.

[0034] Under conventional technical means, the testing table 3 is usually set on the same platform as the clamping and limiting mechanism 4, or the clamping and limiting mechanism 4 is directly installed on the testing table 3. Considering that the test block 10 has a certain height, while the height of the sliding seat and the slider is usually relatively low, it is usually difficult to adapt to the height of the test block 10. As a result, the abutment 405 often cannot abut against the center position of the side of the test block 10, and it is usually necessary to raise the sliding seat. In this embodiment, the testing table 3 and the clamping and limiting mechanism 4 are deliberately installed on the base frame 102 and the fixture frame 103 respectively, and the fixture frame 103 is fixed at intervals above the testing table 3. The middle part of the fixture frame 103 is provided with a test block groove 104 to avoid the test block 10, so that the clamping and limiting mechanism 4 is distributed above the testing table 3, forming a height difference, thereby enabling the abutment 405 on the clamping and limiting mechanism 4 to abut against the center position of the side wall of the test block 10, so as to achieve stable limiting and positioning of the test block 10.

[0035] Furthermore, the gap between the fixture frame 103 and the testing table 3, along with the test block slot 104, forms an annular chip removal space and airflow channel surrounding the test block 10. In this embodiment, by providing air jets 9 facing the testing table 3 on the lower surface of the fixture frame 103, the upper surface of the testing table 3 is purged. This allows the air jets 9 on the lower surface of the fixture frame 103 to effectively blow away debris and dust on the testing table 3, quickly removing the debris from the surface of the testing table 3, thereby achieving rapid cleaning of the testing table 3 and preventing debris from affecting the flat placement and stress formation of the test block 10. The air jets 9 are connected to the air supply system pipeline and controlled by a controller. The air supply system includes at least an air pump and a regulating valve. One set of air jets 9 can be set up for unidirectional purging. If multiple sets are set up, the air jets 9 in opposite directions need to operate alternately.

[0036] A method for testing the strength of a concrete specimen 10, applied to the aforementioned concrete specimen 10 strength testing equipment, includes the following steps: S1: Place test block 10; Manually turn on the jet head 9 to blow air and clean the test table 3, removing dust and debris from its surface; then manually place the test block 10 in the center of the test table 3; at this time, the electronically controlled locking component 406 remains locked, so that the slide rod 404 is fixedly connected to the translation slider 402.

[0037] S2: Preload; After placement, the clamping and limiting mechanism 4 is activated, and each lifting slider 5 moves down synchronously, so that each translation slider 402 moves synchronously toward the center of the testing table 3, so as to limit and clamp the test block 10 in the center of the testing table 3, forming a lateral limit.

[0038] Subsequently, the loading head 202 moves down to abut against the top of the test block 10 and gradually applies pressure to the test block 10.

[0039] S3: Automatic unlock; like Figure 4 When strain gauge 301 detects that the pressure has reached the pre-tightening threshold, the electrically controlled locking component 406 unlocks, and the sliding rod 404 and the translation slider 402 change from a fixed connection to a sliding connection, causing the abutment 405 to release the lateral restraint on the test block 10. The pre-tightening threshold needs to be determined through multiple experiments and can be judged in combination with the data fed back by strain gauge 301. As the loading pressure continues to increase, the data fed back by strain gauge 301 will gradually tend to stabilize and increase from the initial unstable changes, indicating that it is gradually getting rid of the influence of surface unevenness, local positional disturbances, etc., and is about to enter the free loading stage. In this state, the longitudinal pressure provided by the loading head 202 is already able to limit the test block 10 independently, and the lateral restraint can be released. A value in this state can be taken as the pre-tightening threshold, so that the electrically controlled locking component 406 can be unlocked.

[0040] S4: Free loading; The loading head 202 continuously applies pressure to the test block 10 through the power unit 201 until the test block 10 breaks.

[0041] S5: Breakage detection; When the test block 10 breaks, the strain gauge 301 will detect the sudden pressure change, the controller will control the loading device 2 to stop applying pressure, and record the pressure applied by the loading device 2 and the pressure on the strain gauge 301 at that time.

[0042] S6: Reset; like Figure 6 After the test block 10 breaks, each lifting slider 5 moves up and down synchronously, causing each translation slider 402 to move away from the test table 3 synchronously until the translation slider 402 abuts against the reset abutment seat 7, causing the slide rod 404 to return to the initial position relative to the horizontal slider, and then the electronically controlled locking component 406 locks.

Claims

1. A concrete test block strength testing device, characterized in that: Includes mounting frame, loading device, testing table, clamping and limiting mechanism and controller; The testing platform is installed at the lower part of the mounting frame, and multiple sets of strain gauges are evenly arranged on the testing platform; The loading device is installed on the upper part of the mounting frame and includes at least a power unit and a loading head. The loading head is positioned directly above the testing table by the power unit and is used to apply pressure to the test block. The clamping and limiting mechanism is located above the testing table and symmetrically distributed around the perimeter of the testing table. The clamping and limiting mechanism includes a lifting slider, a translational slide rail, a translational slider, a hinge rod, a slide bar, an abutment joint, and an electrically controlled locking component. The lifting slider is vertically mounted on the mounting frame via a lifting mechanism; The translation slide rail is horizontally fixed on the mounting frame and faces the testing table; The translation slider is slidably mounted on the translation slide rail, and a hinge rod is hinged between the translation slider and the lifting slider, so that the translation slider moves left and right as the lifting slider moves up and down. The translation slider has a through hole, the slide rod is slidably disposed in the slide hole, and the end of the slide rod facing the detection table is fixedly connected to an abutment. The translation slider is equipped with an electrically controlled locking component, which can lock the slider rod so that the slider rod is fixedly connected to the translation slider. The controller is connected to the power unit, strain gauge, electronic locking device and lifting mechanism. When the strain gauge detects that the stress reaches the threshold, the electronic locking device unlocks, and the slide rod and the translation slider change from a fixed connection to a sliding connection, so that the abutment releases the lateral limit on the test block.

2. The concrete test block strength testing device according to claim 1, characterized in that: The electrically controlled locking component includes a ring electromagnet and an adsorption armature; The annular electromagnet is fixed to the end of the translation slider away from the detection table and is wrapped around the slider rod; The adsorption armature is fixed at the end of the slide bar away from the detection stage; The annular electromagnet is connected to the controller. When the annular electromagnet is energized, it is attracted and fixed to the armature, thus fixing the slide bar and the translation slider together.

3. The concrete test block strength testing device according to claim 2, characterized in that: The end of the translation slide rail away from the detection table is vertically fixed with a reset abutment seat. When the translation slider moves to its maximum distance from the detection table, the reset abutment seat limits the translation slider and makes the annular electromagnet fit with the adsorption armature.

4. The concrete test block strength testing device according to claim 3, characterized in that: A return spring is sleeved between the slide rod and the annular electromagnet, and the return spring is abutting between the translation slider and the adsorption armature. When the annular electromagnet is in contact with the adsorption armature, the return spring is compressed and stores elastic force; when the annular electromagnet is de-energized, the return spring forces the slide bar to retract and moves the abutment away from the test block.

5. A concrete test block strength testing device according to any one of claims 1-4, characterized in that: The mounting frame includes a top frame, a bottom frame, and a clamp frame that are fixedly connected. The loading device is mounted on the top frame, the testing platform is fixed on the base frame, and the clamping and limiting mechanism is mounted on the fixture frame.

6. The concrete test block strength testing device according to claim 5, characterized in that: The fixture frame is fixed at intervals above the testing table. A test block slot is provided in the middle of the fixture frame to avoid the test block. An air jet head is provided on the lower surface of the fixture frame facing the testing table to purge the upper surface of the testing table. The air jet head is connected to the air supply system pipeline and is controlled by the controller.

7. A concrete test block strength testing device according to any one of claims 1-4, characterized in that: The lifting mechanism includes a lifting slide, a lifting screw, and a control motor; The lifting slide is fixed on the mounting frame. The lifting screw is vertically rotatably mounted on the lifting slide, and one end of the lifting screw is connected to a control motor, which is connected to a controller. The lifting slider is threadedly connected to the lifting screw and slidably connected to the lifting slide block.

8. A method for testing the strength of concrete test blocks, applied to the concrete test block strength testing equipment as described in claim 6, characterized in that: Includes the following steps: S1: Place the test block; Air is blown from the jet head to clean the testing table; the test block is placed in the center of the testing table; the electronic locking mechanism keeps it locked, so that the slide rod is fixedly connected to the translation slider; S2: Preload; Each lifting slider moves down synchronously, causing each translation slider to move synchronously toward the center of the testing platform, so as to limit and clamp the test block in the center of the testing platform; The loading head is moved down to abut against the top of the test block, and pressure is gradually applied; S3: Automatic unlock; When the strain gauge detects that the pressure has reached the pre-tightening threshold, the electronically controlled locking device unlocks, and the sliding rod and the translation slider change from a fixed connection to a sliding connection, so that the abutment releases the lateral restraint on the test block; S4: Free loading; The loading head continuously applies pressure to the test block through the power unit until the test block breaks; S5: Breakage detection; When the test block breaks, the strain gauge detects a sudden pressure change, and the loading device stops applying pressure. S6: Reset; Each lifting slider moves upward synchronously, causing each translation slider to move away from the testing platform synchronously until the translation slider abuts against the reset abutment seat, causing the slide bar to return to the initial position relative to the horizontal slider, and then the electronic locking device locks.

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