Concrete crack resistance testing device

Abstract

The utility model discloses a concrete anti-cracking performance testing device, which belongs to the technical field of concrete anti-cracking tests, and comprises mounting plates which are symmetrically arranged and positioning rods which are fixed between the two mounting plates in a rectangular array, and a lifting pressure applying mechanism is arranged between the positioning rods in a sliding manner. A movable plate located below the lifting extrusion mechanism is adjustably fixed to the mounting plate, a pressure sensor used for supporting the movable plate is fixedly embedded in the top end of the mounting plate, and draught fans are symmetrically mounted on protrusions at the two ends of the movable plate. After the concrete is dried and solidified, pressure is applied through the extrusion head at the bottom end of the hydraulic rod, and the cracking condition of the concrete surface is shot by the camera in the pressure applying process, so that the surface cracking condition during concrete pouring air drying and pressure applying can be observed conveniently; the influence of external force applied by movement and clamping of the concrete after pouring on the experiment accuracy is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of concrete anti-cracking test, and specifically relates to a concrete anti-cracking performance test device. BACKGROUND

[0002] The properties of concrete include the workability of concrete mixture, concrete strength, deformation and durability, etc., wherein the strength is the main mechanical property of hardened concrete, reflects the quantitative ability of concrete to resist load, and the concrete strength includes compressive strength, tensile strength, shear strength, bending strength, flexural strength and gripping strength, wherein the compressive strength is the largest, and the tensile strength is the smallest, the deformation of concrete includes the deformation under non-load action and the deformation under load action, the deformation under non-load action includes chemical shrinkage, dry-wet deformation and temperature deformation, etc., too much cement dosage is easy to cause micro cracks due to chemical shrinkage in the interior of concrete, and the anti-cracking performance of concrete needs to be detected in the production process to judge whether it is qualified, and a concrete anti-cracking performance test device needs to be used.

[0003] The patent with the application number 202322058254.6 discloses a commercial concrete anti-cracking performance test device, which comprises a base, a push rod motor is fixedly installed on the base, a top plate is fixedly connected to the output shaft of the push rod motor, a double-way motor is fixedly installed on the base, transmission shafts are fixedly connected to the output shafts on the two sides of the double-way motor, a clamping assembly is arranged on the transmission shaft, and a support frame plate is fixedly connected to the base.

[0004] During the concrete anti-cracking performance test, a shaped plate-shaped test piece needs to be used first to apply constraints and induce cracks to generate, so as to evaluate the anti-cracking performance of concrete, the concrete is poured into a test mold, the surface moisture evaporation is accelerated by a fan to induce cracks to generate, the occurrence time and number of cracks are observed by a scale magnifying glass and other tools (flat plate test method), and the above concrete anti-cracking performance test device is used to fix the concrete by using an electric clamping device after observing the crack condition of the concrete, and the crack generation condition of the concrete under pressure is observed, however, the concrete can be affected by external force to generate new cracks in the process of moving and clamping, so that the crack generation experiment of the concrete under pressure can generate errors, and the accuracy of the experiment is poor. UTILITY MODEL CONTENTS

[0005] (1) Technical problem to be solved

[0006] In view of the defects of the prior art, the purpose of the utility model is to provide a concrete anti-cracking performance test device, which aims to solve the technical problem that the concrete can be affected by external force to generate new cracks in the process of moving and clamping under the prior art, so that the crack generation experiment of the concrete under pressure can generate errors, and the accuracy of the experiment is poor.

[0007] (2) Technical solution

[0008] To solve the above-mentioned technical problems, this utility model provides a concrete crack resistance test device, which includes symmetrically arranged mounting plates and positioning rods fixed in a rectangular array between the two mounting plates. A lifting and pressing mechanism is slidably arranged between the multiple positioning rods. A movable plate located below the lifting and pressing mechanism is adjustablely fixed on the mounting plates, and a pressure sensor for supporting the movable plate is embedded in the top of the mounting plates. Fans are symmetrically installed on the protrusions at both ends of the movable plate, and protrusions are fixed on both sides of the inner wall of the movable plate. A casting plate with a frame structure is installed between two of the protrusions.

[0009] When using this technical solution, a movable plate is set on the mounting plate, and a pouring plate is installed in the movable plate through connecting blocks and protrusions. After concrete is poured into the pouring plate, it is dried by a blower. During the drying process, a high-definition camera in the lifting plate captures the cracking of the concrete surface. The height of the camera can be adjusted during the movement of the lifting plate. After the concrete dries and solidifies, pressure is applied by the extrusion head at the bottom of the hydraulic rod. During the pressure application, the camera captures the cracking of the concrete surface, which facilitates observation of the surface cracking during concrete pouring, drying, and pressure application. This avoids the impact of concrete movement after pouring and external forces applied by clamping on the accuracy of the experiment. By embedding and fixing a pressure sensor in the top of the mounting plate, the pressure sensor detects the extrusion pressure on the movable plate. At the same time, the slider at the bottom of the movable plate moves out of the groove, which allows different positions of the concrete at the top of the movable plate to correspond to the extrusion head, making it suitable for pressure tests on different positions of the concrete.

[0010] Preferably, the lifting and pressing mechanism includes a lifting plate and a pressing head threaded into the bottom end of the lifting plate. Tempered glass is fixed on both sides of the bottom end face of the lifting plate, and a high-definition camera located above the tempered glass is embedded in the lifting plate.

[0011] Furthermore, a hydraulic rod is fixed to the top of the mounting plate, and the bottom end of the hydraulic rod passes through the mounting plate and is fixedly connected to the lifting plate.

[0012] Furthermore, a slider is fixed to the bottom end of the movable plate, and a groove for accommodating the slider is provided on the mounting plate.

[0013] Furthermore, the bottom end of the slider is symmetrically fitted with knob bolts through the slide groove. The knob bolts are threaded into the slider, and the top of the knob bolts abuts against the mounting plate.

[0014] Furthermore, the fan protrudes from the top of the cast slab, and protective nets are fixedly installed at both ends of the fan.

[0015] Further, the pouring plate is fixed with a handle at both ends, and a connecting block is fixed on the pouring plate and sleeved on the protrusion, and the protrusion is in interference connection with the inner wall of the connecting block.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the pouring plate has the beneficial effects that:

[0018] The utility model discloses a movable plate is set up on the mounting plate, and the pouring plate is installed through the connecting block and the protrusion in the movable plate, and after the concrete is poured into the pouring plate, the concrete is dried by the fan, and the high-definition camera in the lifting plate is used to shoot the cracking condition of the concrete surface in the drying process, the height of the camera can be adjusted in the moving process of the lifting plate, and the extruding head at the bottom end of the hydraulic rod is used to apply pressure after the concrete is dried and solidified, and the camera is used to shoot the cracking condition of the concrete surface in the process of applying pressure, so that the cracking condition of the concrete surface during pouring, drying and pressure application can be observed, and the influence of the external force on the experimental accuracy caused by the movement and clamping of the concrete after pouring is avoided.

[0019] The pressure sensor is inlaid and fixed at the top end of the mounting plate, the pressure sensor detects the extruding force borne by the movable plate, the sliding block at the bottom end of the movable plate moves out in the sliding groove, the concrete at different positions of the top end of the movable plate can be corresponded with the extruding head, and the pressure experiment on the concrete at different positions can be carried out. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a structural schematic view of the utility model;

[0022] Figure 2 It is a split structural schematic view of the movable plate in the utility model;

[0023] Figure 3 It is another angle structural schematic view of the utility model;

[0024] Figure 4 It is a sectional structural schematic view of the utility model.

[0025] The marks in the drawings are: 1, mounting plate; 2, lifting plate; 3, protruding block; 4, pouring plate; 5, moving plate; 6, connecting block; 7, handle; 8, positioning rod; 9, hydraulic rod; 10, fan; 11, protective net; 12, tempered glass; 13, sliding groove; 14, knob bolt; 15, sliding block; 16, extrusion head; 17, high-definition camera; 18, pressure sensor. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] The specific embodiment is a concrete anti-cracking performance testing device, and a structural schematic diagram thereof is shown in Figure 1 and Figure 2 The concrete anti-cracking performance testing device comprises symmetrically arranged mounting plates 1 and positioning rods 8 fixed in a rectangular array between the two mounting plates 1, a lifting and pressing mechanism is slidingly arranged between the plurality of positioning rods 8, a moving plate 5 located below the lifting and extrusion mechanism is adjustably fixed on the mounting plate 1, a pressure sensor 18 for supporting the moving plate 5 is embedded and fixed at the top end of the mounting plate 1, a fan 10 is symmetrically arranged at the protrusions at both ends of the moving plate 5, protruding blocks 3 are fixed on both sides of the inner wall of the moving plate 5, and a pouring plate 4 in a frame structure is arranged between the two protruding blocks 3.

[0028] The lifting and extrusion mechanism comprises a lifting plate 2 and an extrusion head 16 threadedly inserted at the bottom end of the lifting plate 2, tempered glasses 12 are fixed on both sides of the bottom end surface of the lifting plate 2, a high-definition camera 17 is embedded and arranged above the tempered glasses 12, the tempered glasses 12 can block the splashes of the concrete pressing debris, avoiding the influence of the debris on the high-definition camera 17, a hydraulic rod 9 is fixed at the top end of the mounting plate 1, the bottom end of the hydraulic rod 9 is fixedly connected with the lifting plate 2 through the mounting plate 1, a sliding block 15 is fixed at the bottom end of the moving plate 5, a sliding groove 13 for accommodating the sliding block 15 is formed in the mounting plate 1, the pressure sensor 18 detects the extrusion force borne by the moving plate 5, and at the same time, the sliding block 15 at the bottom end of the moving plate 5 moves out of the sliding groove 13, so that the concrete at different positions at the top end of the moving plate 5 corresponds to the extrusion head 16, and the device is suitable for pressing experiments on different positions of the concrete.

[0029] As shown in Figure 3 and Figure 4As shown, the bottom end of the sliding block 15 is symmetrically provided with a knob bolt 14 penetrating the sliding groove 13, the knob bolt 14 is screwed into the sliding block 15, and the top end of the knob bolt 14 abuts against the mounting plate 1, the fan 10 is protrudingly arranged at the top end of the pouring plate 4, both ends of the fan 10 are fixedly provided with the protective net 11, both ends of the pouring plate 4 are fixedly provided with the handle 7, and the pouring plate 4 is fixedly provided with the connecting block 6 sleeved on the protruding block 3, the protruding block 3 is in interference connection with the inner wall of the connecting block 6, the pouring plate 4 is arranged in the moving plate 5 through the connecting block 6 and the protruding block 3, the concrete poured into the pouring plate 4 is dried by the fan 10, and the cracking condition of the concrete surface is shot by the high-definition camera 17 in the lifting plate 2 during the drying process, the height of the camera can be adjusted during the movement of the lifting plate 2, the concrete is dried and solidified, the extrusion head 16 at the bottom end of the hydraulic rod 9 applies pressure, and the camera shoots the cracking condition of the concrete surface during the pressure application, so that the cracking condition of the concrete surface during the pouring, drying and pressure application can be observed.

[0030] The knob bolt 14 abuts against the bottom end of the mounting plate 1 after being tightened, can keep the concrete in the moving plate 5 stable before pressure application, and the knob bolt 14 will extrude the pressure sensor 18 to generate a value when being tightened, the extrusion force generated by the knob bolt 14 is far less than the extrusion force generated by the pressure application mechanism, the pressure application mechanism will move the moving plate 5 and the knob bolt 14 downward when extruding the concrete, the knob bolt 14 is separated from the mounting plate 1, so that the knob can keep the moving plate 5 stable before pressure application, and will not affect the pressure detected by the pressure sensor 18, a display screen connected with the high-definition camera 17 and the pressure sensor 18 is further arranged on one side of the concrete anti-cracking performance testing device, and the display screen displays the image transmitted by the high-definition camera 17 and the pressure value detected by the pressure sensor 18, respectively, the display of the highlight and the pressure value belongs to the prior art, and will not be described here.

[0031] Working principle: when the device of the technical scheme is used, the handle 7 is held to connect the connecting block 6 at both ends of the pouring plate 4 with the protruding block 3, the concrete poured into the pouring plate 4 is dried by the fan 10, and the cracking condition of the concrete surface is shot by the high-definition camera 17 in the lifting plate 2 during the drying process, the height of the camera can be adjusted during the movement of the lifting plate 2, the concrete is dried and solidified, the extrusion head 16 at the bottom end of the hydraulic rod 9 applies pressure, and the camera shoots the cracking condition of the concrete surface during the pressure application, the cracking condition of the concrete surface during the pouring, drying and pressure application is observed, the pressure sensor 18 detects the extrusion force borne by the moving plate 5, and the sliding block 15 at the bottom end of the moving plate 5 moves out of the sliding groove 13, so that the concrete at different positions of the top end of the moving plate 5 corresponds to the extrusion head 16, and the device is suitable for pressure application experiments of the concrete at different positions.

[0032] All the technical features in the embodiment can be freely combined according to actual needs.

[0033] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of the present application.

Claims

1. A concrete crack resistance testing device, comprising symmetrically arranged mounting plates (1) and positioning rods (8) fixed in a rectangular array between the two mounting plates (1), characterized in that, A lifting and pressing mechanism is slidably arranged between multiple positioning rods (8). A movable plate (5) located below the lifting and pressing mechanism is adjustablely fixed on the mounting plate (1). A pressure sensor (18) for supporting the movable plate (5) is embedded in the top of the mounting plate (1). Fans (10) are symmetrically installed on the protrusions at both ends of the movable plate (5). Protrusions (3) are fixed on both sides of the inner wall of the movable plate (5). A casting plate (4) with a frame structure is installed between two of the protrusions (3).

2. The concrete crack resistance testing device according to claim 1, characterized in that, The lifting and pressing mechanism includes a lifting plate (2) and a pressing head (16) threaded into the bottom end of the lifting plate (2). Tempered glass (12) is fixed on both sides of the bottom end face of the lifting plate (2), and a high-definition camera (17) is embedded in the lifting plate (2) above the tempered glass (12).

3. The concrete crack resistance testing device according to claim 2, characterized in that, A hydraulic rod (9) is fixed to the top of the mounting plate (1), and the bottom end of the hydraulic rod (9) passes through the mounting plate (1) and is fixedly connected to the lifting plate (2).

4. The concrete crack resistance testing device according to claim 1, characterized in that, The bottom end of the movable plate (5) is fixed with a slider (15), and the mounting plate (1) is provided with a groove (13) for accommodating the slider (15).

5. The concrete crack resistance testing device according to claim 4, characterized in that, The bottom end of the slider (15) is symmetrically fitted with knob bolts (14) through the slide groove (13). The knob bolts (14) are threaded into the slider (15), and the top end of the knob bolts (14) abuts against the mounting plate (1).

6. The concrete crack resistance testing device according to claim 1, characterized in that, The fan (10) protrudes from the top of the casting plate (4), and protective nets (11) are fixedly installed at both ends of the fan (10).

7. The concrete crack resistance testing device according to claim 6, characterized in that, Both ends of the casting plate (4) are fixed with handles (7), and a connecting block (6) is fixed on the casting plate (4) and sleeved on the protrusion (3). The protrusion (3) and the inner wall of the connecting block (6) are interference-fitted.

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