Concrete testing device

Abstract

The invention relates to a concrete testing device which comprises a top plate, stand columns and an inner bottom plate, the top plate and the inner bottom plate are fixedly connected through the stand columns, an air cylinder is connected to the top plate, a mounting seat is connected to the bottom of the air cylinder, two loading pressure heads are movably connected to the mounting seat, two supporting devices are arranged on the inner bottom plate, and a concrete test piece is supported and placed on the supporting devices. A lower limiting rod is fixedly connected to the supporting device, an upper limiting rod is rotationally connected to the lower limiting rod, a connecting rod is connected to the upper limiting rod, a first pressing plate and a second pressing plate are connected to the connecting rod, the two lower limiting rods and the two second pressing plates jointly limit one face of the concrete test piece, and the two second pressing plates limit the two side faces of the concrete test piece respectively. When a concrete test piece is placed on the supporting device, the concrete test piece extrudes the second pressing plate backwards, the two first pressing plates extrude the concrete test piece in the middle, a positioning line on the concrete test piece can be conveniently aligned with the supporting device, and time and labor are saved.

Description

Technical Field

[0001] This application relates to the technical field of concrete, and particularly to a flexural test device for concrete specimens. Background Art

[0002] The flexural strength of concrete is an important index for judging concrete. At present, the flexural strength of concrete is mainly obtained by testing the flexural capacity of concrete specimens using the three-point loading method. However, there are many inconveniences in testing the flexural capacity of concrete specimens at present.

[0003] The patent with the publication number CN218444775U discloses a flexural pressure test device for commercial concrete test blocks, which uses 2 support seats to support the concrete specimen, and controls the clamping and alignment of the concrete specimen by two push plates on the left and right through an electric push rod. However, there are some problems with this device. It is very difficult to control the moving distances of the two push plates to be the same by controlling the movement of the push plates through the electric push rod. After the positioning line of the original concrete specimen is aligned with the support seat, it is easy to cause the positioning line to deviate from the support seat due to the non-uniformity of the push plates. At the same time, after each flexural test of the concrete specimen, when continuing with the subsequent test, the previous operations need to be repeated, which is time-consuming and laborious. Since the concrete specimen is heavy, when conducting the flexural test of the concrete specimen, it is necessary to place the concrete specimen on the support seat. Due to the obstruction of the column of the testing machine, it is troublesome to place, especially when conducting multiple flexural tests of concrete specimens, it requires a lot of physical strength. Summary of the Invention

[0004] In view of the above-mentioned prior art, this application aims to provide a concrete test device, on which a limiting mechanism is provided. After adjusting the position of the support seat, during the process of placing the concrete specimen, the limiting mechanism automatically limits the position of the concrete specimen to ensure that the concrete specimen is placed upright without deviation.

[0005] To achieve the above object, the technical solution of the embodiment of the present invention is realized as follows:

[0006] A concrete test device includes a top plate, columns and an inner bottom plate. The columns fixedly connect the top plate and the inner bottom plate. A cylinder is connected to the top plate, and an installation seat is connected to the bottom of the cylinder. Two loading heads are movably connected to the installation seat. Two support devices are provided on the inner bottom plate, and the concrete specimen is supported and placed on the support devices. A lower limiting rod is fixedly connected to the support device, an upper limiting rod is rotatably connected to the lower limiting rod, a connecting rod is connected to the upper limiting rod, a first pressing plate and a second pressing plate are connected to the connecting rod. One surface of the concrete specimen is jointly limited by the two lower limiting rods and the two second pressing plates, and the two side surfaces of the concrete specimen are respectively limited by the two second pressing plates.

[0007] Further, the connecting rod is movably connected to the upper limit rod. The upper limit rod is provided with a threaded hole, and a locking rod for locking the connecting rod is provided on the upper limit rod. The locking rod is threadedly connected to the threaded hole.

[0008] Further, an upper fixing rod is connected to the upper limit rod, and a lower fixing rod is connected to the lower limit rod. A torsion spring is fixedly connected to the lower fixing rod, and the upper fixing rod and the lower fixing rod are connected by the torsion spring.

[0009] Further, the supporting device includes a movable block and a supporting seat. The movable block and the supporting seat are fixedly connected. The lower limit rod is fixedly connected to the supporting seat. A first groove is provided on the inner bottom plate. A threaded rod is provided in the first groove. A knob is fixedly connected to the threaded rod. The movable block is threadedly connected to the threaded rod.

[0010] Further, a scale is provided on the inner bottom plate, and a pointer for indicating the distance is provided on the supporting seat.

[0011] Further, the inner bottom plate is fixedly connected to an outer bottom plate. A moving device is provided on the outer bottom plate. The moving device includes a base. A roller is connected to the lower part of the base. A lifter is fixedly connected to the base. A placing plate is connected to the lifter.

[0012] Further, second grooves are provided on the inner bottom plate and the outer bottom plate, and the rollers roll in the second grooves.

[0013] Further, a baffle is provided on the placing plate, and the baffle is parallel to the central axis in the length direction of the concrete specimen.

[0014] Further, a clamping block is movably connected to the end of the second groove, and the first groove penetrates through the inner bottom plate up and down.

[0015] The beneficial effects of the present invention are as follows: When placing the concrete specimen on the supporting seat, as the concrete specimen is pushed towards the lower limit rod, the concrete specimen pushes the two second pressing plates to move backward. During this process, the two first pressing plates push towards the middle to limit the position of the concrete specimen for alignment. When the concrete specimen is placed adjacent to the two lower limit rods, the two second pressing plates tightly press the concrete specimen, and the two first pressing plates just tightly press the two sides of the concrete specimen. When performing multiple measurements, it is only necessary to place the concrete specimen on the supporting seat, and the alignment is naturally completed, which is time-saving and convenient.

[0016] An outer bottom plate is arranged on the inner bottom plate, and a moving device is arranged. The concrete specimen is placed on the moving device, and the moving device is pushed onto the inner bottom plate and placed between the two supporting seats. During this process, the concrete specimen is aligned by the limiting mechanism and can only move up and down. The height of the moving device is lowered, and the concrete specimen is placed on the supporting seat. Due to the action of the limiting mechanism, the concrete specimen will not move. The concrete specimen is moved from outside the column to the supporting seat by relying on the moving device, saving the physical strength of the staff. Description of the Drawings

[0017] Figure 1 Schematic structural diagram of a concrete testing device of the present invention;

[0018] Figure 2 Schematic diagram of the support device of a concrete testing device of the present invention;

[0019] Figure 3 Schematic enlarged view of part A of a concrete testing device of the present invention;

[0020] Figure 4 Schematic diagram of the limit mechanism of a concrete testing device of the present invention;

[0021] Figure 5 Schematic diagram of the placement of concrete specimens of a concrete testing device of the present invention;

[0022] Figure 6 Schematic diagram of the moving mechanism of the support device of a concrete testing device of the present invention;

[0023] Figure 7 Schematic diagram of the moving device of a concrete testing device of the present invention;

[0024] Figure 8 Schematic diagram of the upper baffle of the moving device of a concrete testing device of the present invention.

[0025] Explanation of the reference numerals in the drawings: 1, top plate; 2, column; 3, inner bottom plate; 4, outer bottom plate; 5, moving device; 6, support device; 7, concrete specimen; 8, mounting seat; 9, loading ram; 10, cylinder; 11, knob; 12, first groove; 13, threaded rod; 14, movable block; 15, support seat; 16, lower limit rod; 17, scale; 18, first pressing plate; 19, second pressing plate; 20, connecting rod; 21, upper limit rod; 22, locking rod; 23, pointer; 24, lower fixing rod; 25, upper fixing rod; 26, torsion spring; 27, threaded hole; 28, base; 29, lift; 30, placing plate; 31, second groove; 32, clamping block; 33, baffle; 34, roller. [[ID=**36**]]Specific implementation manner

[0026] The technical solution of the present invention will be further elaborated in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, the expression "some embodiments" describes a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0027] With reference to the attached Figures 1 to 8, the present invention provides a concrete testing device, including a top plate 1, columns 2 and an inner bottom plate 3. The columns 2 fixedly connect the top plate 1 and the inner bottom plate 3. A cylinder 10 is connected to the top plate 1. The bottom of the cylinder 10 is connected to a mounting seat 8. Two loading heads 9 are movably connected to the mounting seat 8. Two supporting devices 6 are provided on the inner bottom plate 3. A concrete specimen 7 is supported and placed on the supporting devices 6. A lower limit rod 16 is fixedly connected to the supporting device 6. An upper limit rod 21 is rotatably connected to the lower limit rod 16. A connecting rod 20 is connected to the upper limit rod 21. A first pressing plate 18 and a second pressing plate 19 are connected to the connecting rod 20. One surface of the concrete specimen 7 is restricted by the two lower limit rods 16 and the two second pressing plates 19 together, and the two second pressing plates 19 respectively restrict two side surfaces of the concrete specimen 7. During the process of placing the concrete specimen 7 on the supporting devices 6 after adjusting the distance between the supporting devices 6, the back surface of the concrete specimen 7 presses against the two second pressing plates 19. Because the upper limit rod 21 and the lower limit rod 16 are rotatably connected, during the process of the two second pressing plates 19 moving backward, the two first pressing plates 18 respectively press against the side surfaces of the concrete specimen 7 from left and right towards the middle. The surface where the two lower limit rods 16 are located is parallel to the back surface of the concrete specimen 7. After setting the angle of the connecting rod 20, after the concrete specimen 7 abuts against the two lower limit rods 16, the two second pressing plates 19 both abut against the back surface of the concrete specimen 7, and the two first pressing plates 18 respectively abut against the two side surfaces of the concrete specimen 7, restricting the concrete specimen 7 in the front-back, left-right directions. When the concrete specimen 7 is placed on the supporting device 6 and pushed from front to back, the concrete specimen 7 is limited and aligned, saving the subsequent alignment time. After the concrete specimen 7 is aligned with the supporting device 6, the cylinder 10 is started, and the mounting seat 8 moves downward, and the two loading heads 9 on the mounting seat press down the concrete specimen 7 to complete the test. The conventional sizes of the concrete specimen 7 are 150mm×150mm×550mm and 100mm×100mm×400mm. When the three-point loading method is used, the scribed distance of the support seat from both ends is 50mm, and the distance is fixed. Just by setting the length of the connecting rod 20 in advance, the positioning of the conventional concrete specimen 7 can be satisfied. Especially when conducting multiple tests on the concrete specimen 7, a large amount of alignment time after placement is saved. With the device assisting in alignment, it is more accurate compared to observing with the human eye.

[0028] Preferably, the connecting rod 20 is movably connected to the upper limit rod 21. A threaded hole 27 is provided on the upper limit rod 21. A locking rod 22 for locking the connecting rod 20 is provided on the upper limit rod 21. The locking rod 22 is threadedly connected to the threaded hole 27. The movable connection between the connecting rod 20 and the upper limit rod 21 can adjust the distance from the first pressing plate 18 to the supporting device 6. The locking rod 22 is used to fix the moved connecting rod 20 to prevent it from sliding, ensuring the accuracy of the device alignment.

[0029] Preferably, an upper fixing rod 25 is connected to the upper limit rod 21, a lower fixing rod 24 is connected to the lower limit rod 16, a torsion spring 26 is fixedly connected to the lower fixing rod 24, and the upper fixing rod 25 and the lower fixing rod 24 are connected by the torsion spring 26. The torsion spring 26 is fixed on the lower fixing rod 24, and its elasticity causes the upper fixing rod 25 to rotate towards the concrete specimen 7. The upper fixing rod 25 is fixedly connected to the upper limit rod 21, causing the upper limit rod 21 to rotate. When there is no concrete specimen 7 placed and pressed, the two pressing plates one 19 naturally return to rotate inward, and the two pressing plates two 18 rotate outward respectively, without blocking the concrete specimen 7, so that when placing the concrete specimen 7, there is no need to rotate the connecting rod 20 to adjust the rotation angle and waste time.

[0030] Preferably, the supporting device 6 includes a movable block 14 and a supporting seat 15. The movable block 14 and the supporting seat 15 are fixedly connected. The lower limit rod 16 is fixedly connected to the supporting seat 15. A groove one 12 is provided on the inner bottom plate 3. A threaded rod 13 is provided in the groove one 12. A knob 11 is fixedly connected to the threaded rod 13. The movable block 14 is threadedly connected to the threaded rod 13. By rotating the threaded rod 13 through the knob 11, the movement of the movable block 14 is adjusted, and then the position of the supporting seat 15 is adjusted. The two supporting seats 15 are controlled by two threaded movement devices, and the position of the supporting seat 15 can be more accurately controlled. The supporting device 6 can be moved and adjusted to adapt to concrete specimens 7 of different lengths.

[0031] Preferably, a scale 17 is provided on the inner bottom plate 3, and a pointer 23 for indicating the distance is provided on the supporting seat 15. There is no need to move according to the positioning line on the concrete specimen 7. According to the pointer on the supporting seat 15 and the scale 17 on the inner bottom plate 3, first move the position of the supporting seat 15 and confirm it with the positioning line on the concrete specimen 7 to ensure the accuracy of the support point.

[0032] Preferably, an inner bottom plate 3 is fixedly connected to an outer bottom plate 4. A moving device 5 is provided on the outer bottom plate 4. The moving device 5 includes a base 28. A roller 34 is connected to the lower part of the base 28. An elevator 29 is fixedly connected to the base 28. A placing plate 30 is connected to the elevator 29. The outer bottom plate 4 is connected to the inner bottom plate 3 and is located outside the column 2. The moving device 5 is placed on the outer bottom plate 4 without interference from the column 2, which facilitates the staff to place the concrete specimen 7 on the placing plate 30. The moving device 5 is centrally arranged and moves to the middle of the two support seats 15. During the inward movement, the concrete specimen 7 presses against the second pressing plate 19. When the concrete specimen 7 is placed on the left side, the left first pressing plate 18 presses the concrete specimen 7 to the right. When the concrete specimen 7 is placed on the right side, the right first pressing plate 18 presses the concrete specimen 7 to the left. Finally, the concrete specimen 7 abuts against the two lower limit rods 16, making the central axis of the concrete specimen 7 in the length direction perpendicular to the support seats 15. The two first pressing plates 18 align the concrete specimen 7, so that the positioning line on the concrete specimen 7 is aligned with the support seats 15. Then, the elevator 29 is used to lower the height of the placing plate 30 until the two support seats 15 support the concrete specimen 7. Due to the action of the two first pressing plates 18 and the two second pressing plates 19, the concrete specimen 7 will not shift during the descent. Then, the moving device 5 is pulled out, and the flexural test of the concrete specimen 7 can be carried out. During this process, placing the concrete specimen 7 outside the column 2 is more labor-saving than placing it inside the column 2. Then, the moving device 5 is used to horizontally move the concrete specimen 7, which is more convenient for the limiting device to align and limit the concrete specimen 7.

[0033] Preferably, second grooves 31 are provided on the inner bottom plate 3 and the outer bottom plate 4. The rollers 34 roll in the second grooves 31. The second grooves 31 are centrally arranged on the inner bottom plate 3 and the outer bottom plate 4, so that the moving device 5 can move the concrete specimen 7 to the center of the support seats 15 as much as possible, which is convenient for the subsequent limiting device to align and limit the concrete specimen 7. The rollers 34 roll in the second grooves 31, which is convenient for controlling the moving direction when moving the concrete specimen 7.

[0034] Preferably, a baffle 33 is provided on the placing plate 30. The baffle 33 is parallel to the central axis of the concrete specimen 7 in the length direction. The lower limit rods 16 block and limit the concrete specimen 7 in the front. During the movement of the moving device 5, the baffle 33 pushes the concrete specimen 7 in the rear. After alignment and positioning, the concrete specimen is fixed from four directions of front, back, left and right, further ensuring that the concrete specimen 7 will not move when the moving device 5 lowers the height.

[0035] Preferably, a clamping block 32 is movably connected to the end of the second groove 31, and the first groove 12 penetrates through the inner bottom plate 3 vertically. A clamping block 32 is movably connected to the end of the second groove 31. During use, the clamping block 32 prevents the moving device 5 from accidentally detaching from the outer bottom plate 4. When it is necessary to remove the concrete dust that has fallen into the first groove 31, the clamping block 32 is moved away for convenient cleaning. At the same time, a baffle can be arranged in the front-back direction of the roller 34. When the moving device 5 moves, the baffle pushes small concrete fragments forward to prevent them from affecting the rolling of the roller 34. The first groove 12 penetrates through the inner bottom plate 3 vertically, which facilitates the rotation of the threaded rod 13 so that the concrete fragments above can directly fall off.

[0036] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A concrete testing device, comprising a top plate (1), a column (2) and an inner bottom plate (3), characterized in that: The upright column (2) fixedly connects the top plate (1) and the inner bottom plate (3). A cylinder (10) is connected to the top plate (1). The bottom of the cylinder (10) is connected to a mounting seat (8). Two loading punches (9) are movably connected to the mounting seat (8). Two supporting devices (6) are provided on the inner bottom plate (3). A concrete specimen (7) is supported and placed on the supporting devices (6). A lower limit rod (16) is fixedly connected to the supporting device (6). An upper limit rod (21) is rotatably connected to the lower limit rod (16). A connecting rod (20) is connected to the upper limit rod (21). A first pressing plate (18) and a second pressing plate (19) are connected to the connecting rod (20). The two lower limit rods (16) and the two second pressing plates (19) jointly limit one surface of the concrete specimen (7), and the two second pressing plates (19) respectively limit two side surfaces of the concrete specimen (7).

2. The concrete testing device according to claim 1, characterized in that: The connecting rod (20) is movably connected to the upper limit rod (21). A threaded hole (27) is provided on the upper limit rod (21). A locking rod (22) for locking the connecting rod (20) is provided on the upper limit rod (21). The locking rod (22) is threadedly connected to the threaded hole (27).

3. The concrete testing device according to claim 1, wherein: An upper fixing rod (25) is connected to the upper limit rod (21), and a lower fixing rod (24) is connected to the lower limit rod (16). A torsion spring (26) is fixedly connected to the lower fixing rod (24). The upper fixing rod (25) and the lower fixing rod (24) are connected by the torsion spring (26).

4. A concrete test device according to any one of claims 1-3, characterized in that: The supporting device (6) includes a movable block (14) and a supporting seat (15). The movable block (14) and the supporting seat (15) are fixedly connected. The lower limit rod (16) is fixedly connected to the supporting seat (15). A first groove (12) is provided on the inner bottom plate (3). A threaded rod (13) is provided in the first groove (12). A knob (11) is fixedly connected to the threaded rod (13). The movable block (14) is threadedly connected to the threaded rod (13).

5. The concrete testing device according to claim 4, characterized in that: A scale (17) is provided on the inner bottom plate (3), and a pointer (23) for indicating the distance is provided on the supporting seat (15).

6. A concrete testing device according to any one of claims 1-3, characterized in that: The inner bottom plate (3) is fixedly connected to an outer bottom plate (4). A moving device (5) is provided on the outer bottom plate (4). The moving device (5) includes a base (28). The lower part of the base (28) is connected with rollers (34). A lifter (29) is fixedly connected to the base (28). A placing plate (30) is connected to the lifter (29).

7. A concrete test device according to claim 6, characterized in that: Second grooves (31) are provided on the inner bottom plate (3) and the outer bottom plate (4). The rollers (34) roll in the second grooves (31).

8. The concrete testing device according to claim 6, characterized in that: A baffle (33) is provided on the placing plate (30), and the baffle (33) is parallel to the central axis in the length direction of the concrete specimen (7).

9. The concrete testing device according to claim 7, characterized in that: A clamping block (32) is movably connected to the end of the second groove (31), and the first groove (12) penetrates through the inner bottom plate (3) vertically.

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