Concrete flexural strength detection device and method of use

Abstract

The present invention relates to the field of concrete testing technology, and discloses a concrete flexural strength testing device and a method for use thereof. The device comprises: a testing platform, the top surface of the testing platform is slidably connected to two symmetrically arranged fixing frames, a driving assembly is provided between the fixing frames and the testing platform; a concrete test block is fixedly installed between the two fixing frames; a support frame, the support frame comprises a bracket erected on the periphery of the testing platform, a support plate is fixedly connected to the bracket, and the top end of the support plate is rotatably connected to a rotating plate; a press, the press is fixedly installed on the top end of the rotating plate, the output end of the press passes through the rotating plate and the support plate in sequence and is rotatably connected thereto, the output end of the press is fixedly connected to a pressure block, and the pressure block abuts against the concrete test block. The concrete flexural strength testing device and method for use provided by the present invention can realize automatic centering of the concrete test block, thereby improving the testing efficiency; after the test block breaks, there is no impact sound on the test bench, thereby effectively reducing the noise pollution in the laboratory.

Description

Technical Field

[0001] The present application relates to the technical field of concrete testing, and in particular to a concrete flexural strength testing device and a method for using the same. Background Art

[0002] Concrete is one of the most important civil engineering materials today. To ensure construction quality, concrete strength testing is essential, with flexural strength being one of the key test items. For materials like pavement cement concrete and permeable concrete, flexural strength is a crucial quality control indicator and must be tested.

[0003] Concrete flexural strength testing is usually performed using a three-point loading device on a pressure testing machine or universal testing machine. During the test, the three-point loading device needs to be installed on the testing machine, and the spacing between the lower support roller and the upper pressure roller needs to be adjusted. This method and device have the following problems: the three-point loading device needs to be installed and manually aligned for each test, which makes the test process cumbersome and inefficient, and the results are greatly affected by human factors; after the test block breaks, it impacts the test bench, making a loud noise and causing laboratory noise pollution; after the test block breaks, the fragments fly or fall onto the test bench, posing a safety hazard and difficult to clean. Therefore, there is an urgent need to develop a concrete flexural strength testing device and its use method to address the above problems.

[0004] The existing Chinese patents that can be referenced partially solve the above problems, but the problem of laboratory noise pollution caused by the impact test bench after the test block breaks has not been well solved. Therefore, the present invention provides a concrete flexural strength detection device and a method of use thereof to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a concrete flexural strength detection device and a method of using the same to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] According to a first aspect of an embodiment of the present application, there is provided a concrete flexural strength detection device, comprising:

[0008] A testing platform, wherein the top surface of the testing platform is slidably connected to two symmetrically arranged fixing frames, a driving assembly is provided between the fixing frames and the testing platform, and the two fixing frames are used to clamp concrete test blocks;

[0009] A support frame, the support frame includes a bracket mounted on the periphery of the detection platform, a support plate is fixed to the bracket, and a top end of the support plate is rotatably connected to a rotating plate;

[0010] A press is fixedly mounted on the top of the rotating plate, an output end of the press sequentially passes through the rotating plate and the support plate and is fixedly connected to a pressure block, and the pressure block abuts against the concrete test block.

[0011] Preferably, a workbench is further included, and the detection platform is fixedly installed on the top surface of the workbench.

[0012] Preferably, the bracket includes four columns, the support plate is fixed on the columns, and baffles are fixed between adjacent columns. The baffles can effectively prevent the concrete test block from splashing after breaking, thereby ensuring the safety of the detection.

[0013] Preferably, the fixing frame includes a vertical plate slidably connected to the top surface of the detection platform, and the bottom end of the vertical plate is transmission-connected to the driving assembly; a top plate is fixedly connected to the top opposite surfaces of the two vertical plates, and the top plate abuts the top end of the concrete test block; a bottom plate corresponding to the top plate is slidably connected to the vertical plate, and the bottom plate abuts the bottom end of the concrete test block; a transverse movement assembly and a longitudinal movement assembly are provided between the bottom plate and the vertical plate.

[0014] Preferably, the transverse movement assembly includes a plurality of support rods fixed to the side of the base plate facing the vertical plate, the support rods pass through the vertical plate and are slidably connected to the vertical plate; an end block is fixed to the end of the support rod away from the base plate, a support spring is fixed between the end block and the vertical plate, the support spring is sleeved on the support rod, and the longitudinal movement assembly is hinged to the support rod.

[0015] Preferably, the longitudinal movement assembly includes a sliding sleeve slidably connected to the support rod, and the sliding sleeve is slidingly connected to the vertical plate through a limiting groove; the bottom end of the sliding sleeve is hinged with a transmission rod, and the other end of the transmission rod is hinged with a slider, and the slider is threadedly connected to a first screw, and the first screw is rotatably connected in the longitudinal movement box, and the slider is slidingly connected to the longitudinal movement box; the longitudinal movement box is fixed to the vertical plate; either end of the first screw passes through the side wall of the longitudinal movement box and is fixedly connected to the first motor, and the first motor is fixedly mounted on the longitudinal movement box.

[0016] Preferably, a plurality of connecting grooves are provided at the bottom end of the top plate, a sliding block is slidably connected in the connecting groove, the bottom end of the sliding block extends out of the connecting groove and is hinged to a contact plate, and the contact plate is in contact with the top end of the concrete test block; a protrusion is fixedly connected to the top end of the contact plate, and the protrusion is slidably connected to the give way groove at the bottom end of the top plate, a pressure sensor is fixedly installed in the give way groove, and the pressure sensor is in contact with the protrusion.

[0017] Preferably, the pressure block includes a connecting block fixedly connected to the output end of the press, the connecting block is longitudinally provided with a plurality of through holes, a connecting rod is slidably connected in the through hole, the bottom end of the connecting rod is fixedly connected to a loading block, the bottom end of the loading block is fixedly connected to two symmetrically arranged loading rollers, the top end of the loading rollers abuts against the concrete test block; a loading spring is outerly provided on the connecting rod, and the two ends of the loading spring are respectively fixed to the connecting block and the loading block.

[0018] Preferably, the driving assembly includes a driving cavity opened in the detection platform, a bidirectional screw is rotatably connected in the driving cavity, and the middle part of the bidirectional screw is transmission-connected to a driving motor; the two ends of the bidirectional screw are respectively threadedly connected to a moving block, and the top end of the moving block extends out of the driving cavity and is fixed to the bottom end of the vertical plate.

[0019] Preferably, the top surface of the driving cavity is symmetrically slidably connected with a plurality of opening and closing plates, and two opposite opening and closing plates are in abutment with each other; one end of the opening and closing plates away from each other is fixedly connected to the driving cavity side wall bracket with an opening and closing spring; the moving block is detachably connected to the opening and closing plate.

[0020] Preferably, the edge of the opening and closing piece is arranged in an arc shape, and the front and rear edges of the moving block are also arranged in an arc shape.

[0021] According to a second aspect of an embodiment of the present application, a method for using a concrete flexural strength testing device is provided. The concrete flexural strength testing device described in the first aspect comprises the following steps:

[0022] Select concrete test blocks;

[0023] Install the concrete test block between the two fixing frames;

[0024] Adjust the position of the pressure block, apply pressure to the concrete test block, and record the maximum pressure of the press;

[0025] After the concrete specimen breaks, raise the pressure block and loosen the fixing frame;

[0026] Clean testing platform.

[0027] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0028] As can be seen from the above embodiments, the present invention discloses a concrete flexural strength testing device and a method of use. This device does not require repeated installation and adjustment of the three-point loading device, and can realize automatic installation and centering of the test block, reducing the test links and the workload of the test personnel. The two fixed frames on the detection platform can not only ensure that the concrete test block can rotate freely after it breaks, but also effectively clamp its two ends after it breaks, preventing the fracture of the test block from impacting the platform and making noise after it breaks. The output end of the press applies pressure to the concrete test block through the pressure block, and the pressure block can make the loading roller and the concrete test block contact more closely and the force more uniform. The present device and method are suitable for various types of concrete flexural strength test blocks, with high efficiency, high accuracy, strong safety and low noise pollution.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] Figure 1 A front view of a concrete flexural strength testing device provided by an exemplary embodiment of the present invention;

[0032] Figure 2 for Figure 1 A partial cross-sectional enlarged view of the middle part;

[0033] Figure 3 for Figure 1 A partial cross-sectional enlarged view of B in the middle;

[0034] Figure 4 A schematic diagram of a top view of a drive assembly according to an exemplary embodiment of the present invention;

[0035] Figure 5 A schematic top view of an opening and closing piece provided by an exemplary embodiment of the present invention;

[0036] Figure 6 A schematic diagram of the main structure of a fixing frame provided by an exemplary embodiment of the present invention;

[0037] Figure 7 A schematic side view of a fixing frame provided by an exemplary embodiment of the present invention;

[0038] Figure 8 A schematic diagram of a detection state provided by an exemplary embodiment of the present invention;

[0039] Among them, 1. workbench; 2. testing platform; 3. fixed frame; 4. concrete test block; 5. support frame; 6. press; 7. pressure block; 21. drive chamber; 22. bidirectional screw; 23. drive motor; 24. moving block; 25. opening and closing piece; 26. opening and closing spring; 31. vertical plate; 32. top plate; 33. bottom plate; 34. support rod; 35. end block; 36. support spring; 37. sliding sleeve; 38. limit slot; 39. transmission rod; 310. slider; 311. first screw; 312 , first motor; 313, longitudinal movement box; 314, connecting slot; 315, sliding block; 316, contact plate; 317, protrusion; 318, pressure sensor; 319, clearance slot; 320, positioning block; 321, positioning spring; 322, support roller; 51, column; 52, support plate; 53, rotating plate; 54, baffle; 55, rotating motor; 56, rotating gear; 71, connecting block; 72, through hole; 73, connecting rod; 74, loading block; 75, loading spring; 76, loading pressure roller. DETAILED DESCRIPTION

[0040] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0041] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0042] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0043] Reference Figure 1-7 The present invention provides a concrete flexural strength detection device, which may include:

[0044] A testing platform 2, the top surface of which is slidably connected to two symmetrically arranged fixing frames 3, a driving assembly being provided between the fixing frames 3 and the testing platform 2; the two fixing frames 3 being used to clamp the concrete test block 4;

[0045] The support frame 5 includes a bracket mounted on the periphery of the detection platform 2, the support plate 52 is fixed on the top of the bracket, and the top end of the support plate 52 is rotatably connected to a rotating plate 53;

[0046] The press 6 is fixedly mounted on the top of the rotating plate 53 . The output end of the press 6 passes through the rotating plate 53 and the support plate 52 in sequence and is rotatably connected thereto. The output end of the press 6 is fixedly connected to a pressure block 7 , which abuts against the concrete test block 4 .

[0047] The present invention discloses a concrete flexural strength testing device. Two fixing frames 3 on a testing platform 2 clamp a concrete test block 4 under the drive of a driving assembly and can be flexibly adjusted according to the sizes of different concrete test blocks 4, thereby improving the applicability of the device. The top of a supporting frame 5 supports a press 6. The output end of the press 6 applies pressure to the concrete test block 4 through a pressure block 7 to test the flexural strength of the concrete test block 4. A rotating plate 53 drives the press 6 to rotate, thereby ensuring that the loading roller is perpendicular to the long side of the test block, thereby making the test data more accurate.

[0048] A further optimized solution further includes a workbench 1 , and the detection platform 2 is fixedly installed on the top surface of the workbench 1 .

[0049] A further optimized solution is provided in which the bracket includes four columns 51, which are erected on the periphery of the detection platform 2 and can be fixed on the top surface of the workbench; the support plate 52 is fixedly connected to the columns 51, and baffles 54 are fixedly connected between adjacent columns 51. The baffles 54 can effectively prevent the concrete test block 4 from splashing after breaking, thereby ensuring the safety of the detection.

[0050] A further optimized solution is that the fixed frame 3 includes a vertical plate 31 slidably connected to the top surface of the workbench 1, the bottom end of the vertical plate 31 being transmission-connected to the drive assembly; a top plate 32 is fixedly connected to the top opposite surfaces of the two vertical plates 31, and the top plate 32 abuts the top end of the concrete test block 4; a bottom plate 33 corresponding to the top plate 32 is slidably connected to the vertical plate 31, and the bottom plate 33 abuts the bottom end of the concrete test block 4; a transverse movement assembly and a longitudinal movement assembly are provided between the bottom plate 33 and the vertical plate 31. The drive assembly drives the two fixed frames 3 to move away from or towards each other, clamping the concrete test block 4 placed on the bottom plate 33 to complete the clamping; at the same time, because the two vertical plates 31 move symmetrically, the regularly shaped concrete test block 4 is automatically aligned, reducing the workload and errors of manual installation and alignment.

[0051] To further optimize the solution, the transverse movement assembly includes a plurality of support rods 34 fixed to the side of the bottom plate 33 facing the vertical plate 31, the support rods 34 pass through the vertical plate 31 and are slidably connected to the vertical plate 31; an end block 35 is fixed to the end of the support rod 34 away from the bottom plate 33, and a support spring 36 is fixed between the end block 35 and the vertical plate 31, and the support spring 36 is sleeved on the support rod 34, and the longitudinal movement assembly is hinged to the support rod 34; the longitudinal movement assembly includes a sliding sleeve 37 slidably connected to the support rod 34, and the sliding sleeve 37 passes through the limit groove 3 8 is limitedly slidably connected to the vertical plate 31; the bottom end of the sliding sleeve 37 is hinged with a transmission rod 39, and the other end of the transmission rod 39 is hinged with a slider 310, and the slider 310 is threadedly connected to a first screw 311, and the first screw 311 is rotatably connected in the longitudinal movement box 313, and the slider 310 is slidably connected to the longitudinal movement box 313; the longitudinal movement box 313 is fixed to the vertical plate 31; either end of the first screw 311 passes through the side wall of the longitudinal movement box 313 and is fixedly connected to the first motor 312, and the first motor 312 is fixedly mounted on the longitudinal movement box 313. The first motor 312 drives the first screw 311 to rotate, causing the slider 310 to slide in the longitudinal movement box 313, changing the angle between the support rod 34 and the sliding sleeve 37, and thereby changing the height of the sliding sleeve 37; when the two vertical plates 31 approach each other, the concrete test block 4 pushes the two bottom plates 33 toward the vertical plates 31, causing the support spring 36 to stretch, and finally causing the concrete test block 4 to press against the vertical plates 31; this design allows the support spring 36 to contract when the two vertical plates 31 are far from each other, causing the two bottom plates 33 to approach each other, thereby first supporting the concrete test block 4.

[0052] Furthermore, the sliding sleeve 37 and the vertical plate 31 can only slide longitudinally, and the sliding sleeve 37 and the support rod 34 can slide transversely.

[0053] Furthermore, a support roller 322 is fixed to the top surface of the bottom plate 33 , and the top surface of the support roller 322 abuts against the bottom surface of the concrete test block 4 , so that the concrete test block 4 can deflect freely after breaking to meet the requirements of the hinge support.

[0054] A further optimized solution is shown. The bottom of the top plate 32 is provided with a plurality of connecting slots 314, into which sliding blocks 315 are slidably connected. The bottom end of the sliding block 315 extends out of the connecting slots 314 and is hingedly connected to a contact plate 316, which is fixedly connected to the top of the concrete test block 4. A protrusion 317 is fixedly connected to the top of the contact plate 316, which is slidably connected to a clearance slot 319 at the bottom of the top plate 32. A pressure sensor 318 is fixedly installed in the clearance slot 319 and abuts against the protrusion 317. When the contact plate 316 contacts the concrete test block 4, the force applied to the pressure sensor 318 increases as the force applied to the pressure sensor 318 increases. When the force applied to the pressure sensor 318 reaches a certain level, the first motor 312 stops rotating.

[0055] Furthermore, when the contact plate 316 abuts against the concrete test block 4, the sliding block 315 and the connecting groove 314 are in a stress-free state. When the concrete test block 4 breaks under the action of the pressure block 7, the end of the concrete test block 4 can deflect freely.

[0056] Furthermore, positioning springs 321 are fixed between the opposing surfaces of the two vertical plates 31. Positioning blocks 320 are fixed to the other ends of the positioning springs 321. The positioning blocks 320 abut against the sides of the concrete test block 4. The positioning blocks 320 and positioning springs 321 center and initially position the concrete test block 4, preventing it from moving when not under load, but also preventing it from being stuck. When the concrete test block 4 breaks and deflects, the positioning springs 321 do not lock the positioning blocks 320. Instead, the positioning blocks 320 deflect with the deflection of the concrete test block 4, without hindering its deflection. The overall design of the support rollers 322, positioning springs 321, positioning blocks 320, connecting slots 314, sliding blocks 315, and contact plates 316 ensures that the ends of the concrete test block 4 can freely deflect to meet the requirements of a hinged support, while also ensuring limited deflection of the left and right ends when the concrete test block 4 breaks, thereby preventing the broken ends from impacting the test bench and generating a loud impact noise.

[0057] In a further optimized solution, the pressure block 7 includes a connecting block 71 fixed to the output end of the press 6. The connecting block 71 has a plurality of through holes 72 formed longitudinally therein. A connecting rod 73 is slidably connected to the through holes 72. The bottom end of the connecting rod 73 is fixed to a loading block 74. The bottom end of the loading block 74 is fixed to two symmetrically arranged loading rollers 76. The top ends of the loading rollers 76 abut against the concrete test block 4. A loading spring 75 is provided on the outer sleeve of the connecting rod 73. The two ends of the loading spring 75 are respectively fixed to the connecting block 71 and the loading block 74. The design of the connecting rod 73 and the loading spring 75 allows the loading rollers 76 to deflect freely, adapting to the deformation of the concrete test block 4, so that the loading rollers 76 are in closer contact with the concrete test block 4 and the force is more evenly applied.

[0058] Furthermore, according to the attached Figure 8 The calculation formula for the flexural strength of this embodiment is:

[0059]

[0060] Among them, f is the flexural strength of the concrete specimen 4 (MPa); F is the failure load of the concrete specimen 4 (N); l is the distance between the support rollers 322 at both ends of the concrete; b is the cross-sectional width of the concrete specimen (mm); h is the cross-sectional height of the concrete specimen (mm);.

[0061] A further optimized solution includes a drive assembly comprising a drive chamber 21 within the testing platform 2. A bidirectional screw 22 is rotatably connected within the drive chamber 21, with a drive motor 23 connected to the middle of the bidirectional screw 22. A moving block 24 is threadedly connected to each end of the bidirectional screw 22. The top end of the moving block 24 extends out of the drive chamber 21 and is fixedly connected to the bottom end of the vertical plate 31. The bidirectional screw 22, through two symmetrically moving moving blocks 24, drives the vertical plate 31 to move symmetrically, completing the clamping of the concrete test block 4.

[0062] A further optimized solution features several opening and closing pieces 25 symmetrically slidably connected to the top surface of the drive chamber 21, with opposing opening and closing pieces 25 abutting against each other. An opening and closing spring 26 is fixedly connected to the side wall bracket of the drive chamber 21 at the ends of the opening and closing pieces 25 facing away from each other. The movable block 24 is detachably connected to the opening and closing pieces 25. The edges of the opening and closing pieces 25 are curved, as are the front and rear edges of the movable block 24. The curved opening and closing pieces 25 and movable block 24 open when in contact, and then close via the rear opening and closing spring 26, preventing debris from the broken concrete specimen 4 from falling into the drive chamber 21.

[0063] The embodiment of the present invention further provides a method for using a concrete flexural strength detection device, comprising the following steps:

[0064] Step 1: Select concrete test block 4.

[0065] Step 2: Install the concrete test block 4 between the two fixing frames 3. First, place the concrete test block 4 on the two bottom plates 33. Then, start the drive motor 23 to move the two vertical plates 31 closer together until the concrete test block 4 pushes the two bottom plates 33 against the side walls of the vertical plates 31. Then, start the first motor 312 to drive the slider 310 to translate within the longitudinal movement box 313. The connecting rod 73 drives the bottom plates 33 to rise, causing the top of the concrete test block 4 to press against the contact plate 316 until the pressure measured by the pressure sensor 318 reaches a certain value.

[0066] Step 3: Close the baffles 54. Lower the baffles 54 around to prevent the concrete test block 4 from splashing.

[0067] Step 4: Load the concrete test block 4. Start the press 6, allowing the loading block 74 to gradually move downward until it contacts the concrete test block 4. Pause and observe whether the loading roller 76 is perpendicular to the long side of the concrete test block 4. If not, start the rotating motor 55, which rotates the gear 56 and the meshing rotating plate 53, so that the loading roller 76 is perpendicular to the long side of the concrete test block 4. Continue to operate the press 6, slowly increasing the load while observing the condition of the concrete test block 4 until the test block 4 breaks. Record the maximum output pressure of the press 6.

[0068] Step 5: After the concrete test block 4 breaks, raise the pressure block 7, loosen the fixing frame 3, and then remove the concrete test block 4.

[0069] Step 6: Clean the detection platform 2 and remove any residue.

[0070] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0071] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A concrete flexural strength testing device, characterized in that: include: A detection platform (2), wherein the top surface of the detection platform (2) is slidably connected to two symmetrically arranged fixing frames (3), a driving assembly is provided between the fixing frames (3) and the detection platform (2), and the two fixing frames (3) are used to clamp concrete test blocks (4); A support frame (5), the support frame (5) comprising a bracket mounted on the periphery of the detection platform (2), a support plate (52) being fixedly connected to the bracket, and a top end of the support plate (52) being rotatably connected to a rotating plate (53); A press (6), wherein the press (6) is fixedly mounted on the top of the rotating plate (53), and an output end of the press (6) sequentially passes through the rotating plate (53) and the support plate (52) and is fixedly connected to a pressure block (7), wherein the pressure block (7) abuts against the concrete test block (4); The fixing frame (3) includes a vertical plate (31) slidably connected to the top surface of the detection platform (2), and the bottom end of the vertical plate (31) is transmission-connected to the driving assembly; the top opposite surfaces of the two vertical plates (31) are fixedly connected with a top plate (32), and the top plate (32) abuts against the top end of the concrete test block (4); a bottom plate (33) corresponding to the top plate (32) is slidably connected to the vertical plate (31), and the bottom plate (33) abuts against the bottom end of the concrete test block (4); a transverse movement assembly and a longitudinal movement assembly are provided between the bottom plate (33) and the vertical plate (31); The transverse movement assembly includes a plurality of support rods (34) fixedly connected to the bottom plate (33) on the side facing the vertical plate (31), the support rods (34) passing through the vertical plate (31) and being slidably connected to the vertical plate (31); an end block (35) is fixedly connected to one end of the support rod (34) away from the bottom plate (33), a support spring (36) is fixedly connected between the end block (35) and the vertical plate (31), the support spring (36) is sleeved on the support rod (34), and the longitudinal movement assembly is hinged to the support rod (34); The longitudinal movement assembly includes a sliding sleeve (37) slidably connected to the support rod (34), and the sliding sleeve (37) is limitedly slidably connected to the vertical plate (31) through a limiting groove (38); the bottom end of the sliding sleeve (37) is hinged with a transmission rod (39), and the other end of the transmission rod (39) is hinged with a slider (310), and the slider (310) is threadedly connected to a first screw rod (311), and the first screw rod (311) is rotatably connected in the longitudinal movement box (313), and the slider (310) is slidably connected to the longitudinal movement box (313); the longitudinal movement box (313) is fixedly connected to the vertical plate (31); either end of the first screw rod (311) passes through the side wall of the longitudinal movement box (313) and is fixedly connected to a first motor (312), and the first motor (312) is fixedly mounted on the longitudinal movement box (313).

2. The concrete flexural strength testing device according to claim 1, characterized in that: The bottom end of the top plate (32) is provided with a plurality of connecting grooves (314), wherein a sliding block (315) is slidably connected in the connecting groove (314), wherein the bottom end of the sliding block (315) extends out of the connecting groove (314) and is hingedly connected to a contact plate (316), wherein the contact plate (316) is in contact with the top end of the concrete test block (4); a protrusion (317) is fixedly connected to the top end of the contact plate (316), wherein the protrusion (317) is slidably connected to a clearance groove (319) at the bottom end of the top plate (32), wherein a pressure sensor (318) is fixedly installed in the clearance groove (319), and wherein the pressure sensor (318) is in contact with the protrusion (317).

3. The concrete flexural strength testing device according to claim 1, characterized in that: The pressure block (7) includes a connecting block (71) fixedly connected to the output end of the press (6), the connecting block (71) is longitudinally provided with a plurality of through holes (72), a connecting rod (73) is slidably connected in the through hole (72), the bottom end of the connecting rod (73) is fixedly connected to a loading block (74), the bottom end of the loading block (74) is fixedly connected to two symmetrically arranged loading rollers (76), the top end of the loading roller (76) is in contact with the concrete test block (4); the outer sleeve of the connecting rod (73) is provided with a loading spring (75), the two ends of the loading spring (75) are respectively fixedly connected to the connecting block (71) and the loading block (74).

4. The concrete flexural strength testing device according to claim 1, characterized in that: The driving assembly comprises a driving cavity (21) provided in the detection platform (2), a bidirectional screw (22) being rotatably connected in the driving cavity (21), and a driving motor (23) being transmission-connected to the middle of the bidirectional screw (22); a moving block (24) being threadedly connected at both ends of the bidirectional screw (22), and a top end of the moving block (24) extending out of the driving cavity (21) and fixedly connected to the bottom end of the vertical plate (31).

5. The concrete flexural strength testing device according to claim 4, characterized in that: The top surface of the driving chamber (21) is symmetrically slidably connected with a plurality of opening and closing pieces (25), and two opposite opening and closing pieces (25) are in abutment with each other; an opening and closing spring (26) is fixedly connected to a side wall bracket of the driving chamber (21) at one end of the opening and closing pieces (25) away from each other; and the moving block (24) is detachably connected to the opening and closing piece (25).

6. The concrete flexural strength testing device according to claim 5, characterized in that: The edge of the opening and closing piece (25) is arranged in an arc shape, and the front and rear edges of the moving block (24) are also arranged in an arc shape.

7. A method for using a concrete flexural strength testing device, the concrete flexural strength testing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Select concrete test block (4); Installing the concrete test block (4) between the two fixing frames (3); Adjust the position of the pressure block (7), apply pressure to the concrete test block (4), and record the maximum pressure of the press (6); After the concrete test block (4) breaks, the pressure block (7) is raised and the fixing frame (3) is loosened; Clean the testing platform (2).

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