Strength testing machine for 3D printing concrete

Abstract

The utility model discloses a 3D printing concrete strength testing machine, which relates to the technical field of testing equipment, and comprises a workbench, the upper surface of the workbench is fixedly connected with a supporting plate, the supporting plate is fixedly connected with a hydraulic cylinder, the hydraulic cylinder comprises a movable end and a fixed end, and the movable end of the hydraulic cylinder is fixedly connected with a lower pressing plate. A driving motor is fixedly connected to the upper surface of the workbench, a bidirectional threaded rod is fixedly connected to the output shaft end of the driving motor, extension plates are symmetrically and fixedly connected to the upper surface of the workbench, the two ends of the bidirectional threaded rod are rotationally connected with the extension plates, and two threaded sleeves are in threaded connection to the outer surface of the bidirectional threaded rod. And one end of each of the two threaded sleeves is fixedly connected with a protective shell. An operator only needs to place a concrete block on the workbench, the operation of opening and closing a protective door is not needed, the concrete block does not need to be manually adjusted to the middle position, automatic centering is achieved, operation is simplified, testing is more convenient and faster, and efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a 3D printing concrete strength tester. Background Technique

[0002] 3D printing concrete is a new type of concrete material and construction technology formed by layer-by-layer stacking through additive manufacturing technology (commonly known as 3D printing). It breaks through the limitations of traditional concrete pouring technology and can quickly build complex structures without templates. It is an important direction for building industrialization and intelligentization. The essence of strength testing of 3D printing concrete is to obtain the ultimate bearing capacity of the material. Only by testing the maximum pressure value when the 3D printing concrete test block fails can the compressive strength value be accurately measured. Therefore, when a concrete strength tester (such as a pressure testing machine) tests the strength of a concrete block, the concrete block usually breaks, which is a normal phenomenon during the testing process and also the key basis for judging whether the concrete strength meets the standard.

[0003] The utility model with the publication number of CN213632978U discloses a concrete strength detection device. After placing the concrete block body on the top of the placement table, starting the first motor to work can drive the bidirectional threaded rod to rotate. While the bidirectional threaded rod rotates, it can drive the movable block to move to both sides of the bidirectional threaded rod. While the movable block moves, it drives the movable rod to move, and then the movable rod supports the protective cover upward. Under the support of the movable rod, the protective cover moves upward until the protective cover extends above the operation box, thereby forming a good sealing protection around the concrete block body and effectively avoiding the splashing of debris to the outside during the detection process. However, when the concrete block is subjected to strength testing, centering is required, that is, ensuring that the action line of the applied load coincides with the center line of the concrete block, so as to eliminate the additional bending stress and make the concrete block in a pure axial compression state, so as to obtain true and reliable compressive strength data. If centering is not carried out, the concrete block will bear additional bending stress, which may lead to the measured compressive strength data being lower than the actual data.

[0004] The utility model with the publication number of CN216350035U discloses a workbench for concrete strength detection in building engineering. Through the driving motor and the rotating handle, the horizontal and vertical positions of the detection rod can be adjusted, and then the detection of different positions of the concrete can be carried out, which is convenient for adjusting the position mechanically. The rotating handle can finely adjust the detection position. This scheme can achieve centering by adjusting the position of the detection rod, but it needs to manually rotate the handle to adjust the vertical position of the detection rod, which is not only inconvenient to operate, but also manual adjustment cannot ensure accurate centering.

[0005] Therefore, in view of this, the utility model provides a 3D printing concrete strength tester. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present utility model provides a 3D printing concrete strength tester to solve the problems raised in the above-mentioned background art.

[0007] To achieve the above objectives, the present utility model is realized through the following technical solutions:

[0008] A 3D printing concrete strength tester includes a workbench. A support plate is fixedly connected to the upper surface of the workbench. A hydraulic cylinder is fixedly connected to the support plate. The movable end of the hydraulic cylinder is fixedly connected to a lower pressing plate. A driving motor is fixedly connected to the upper surface of the workbench. The output shaft end of the driving motor is fixedly connected to a bidirectional threaded rod. Extension plates are symmetrically and fixedly connected to the upper surface of the workbench. Both ends of the bidirectional threaded rod are rotatably connected to the extension plates. Two threaded sleeves are threadedly connected to the outer surface of the bidirectional threaded rod. One end of each of the two threaded sleeves is fixedly connected to a protective shell. One side and the bottom surface of the two protective shells facing each other are open, and the remaining surfaces are closed;

[0009] Sleeves are fixedly connected to the inner walls of the two protective shells. A sleeve rod is slidably connected to each sleeve. The end of the sleeve rod away from the sleeve is fixedly connected to a push plate. The push plate is integrally U-shaped, and the inner sides of its two side surfaces are inclined planes. A support spring is fixedly connected between the sleeve and the sleeve rod.

[0010] Preferably, a contact switch is fixedly connected to the support plate. An electromagnet is fixedly connected to the end of the sleeve away from the sleeve rod. The sleeve rod is made of iron, and the electromagnet generates magnetism when energized and adsorbs the sleeve rod.

[0011] Preferably, a square hole is opened at the center position of the workbench, and a cavity is opened on the side surface of the workbench. A placement plate is slidably connected in the cavity.

[0012] Preferably, an electric push rod is fixedly connected to the bottom of the workbench. The telescopic end of the electric push rod is fixedly connected to a load-bearing column, and the load-bearing column is fixedly connected to the bottom of the placement plate.

[0013] Preferably, two horizontal grooves are opened on the upper surface of the workbench, and the protective shell is slidably connected in the two horizontal grooves.

[0014] The 3D printing concrete strength tester provided by the present utility model has the following beneficial effects:

[0015] The operator only needs to place the concrete block on the workbench without opening or closing the protective door. The two protective shells will automatically open and close to form a closed space to prevent fragments from flying out. The push plate can automatically adjust the concrete block to the middle position of the workbench without manual adjustment, so as to avoid the concrete block to be tested not being in the middle position, so that the lower pressure plate is eccentrically pressed on the concrete block, causing one side of the concrete block to bear concentrated load first and additional bending stress, resulting in non-uniform pressure, leading to premature edge cracking and breakage, which cannot reflect the true compressive strength of the material. In addition, the concrete block and the lower pressure plate are automatically aligned during the closing process of the protective shell, making the operation more convenient and the work efficiency higher.

[0016] The expansion and contraction of the support spring can adapt to concrete blocks of various sizes, making it more adaptable;

[0017] The broken concrete blocks will fall from the bottom of the workbench, thus achieving the effect of automatically removing the concrete blocks, avoiding the broken concrete blocks from being scattered and difficult to collect and clean. The rapid removal of the concrete blocks is conducive to the operator to test the next concrete block, thereby improving the efficiency of batch testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model in the front view direction;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model in the rear view direction;

[0020] Figure 3 This is a schematic diagram of the partial cross-section structure of the protective shell of the utility model;

[0021] Figure 4 For this utility model Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0022] Figure 5 This is a schematic diagram of the three-dimensional installation structure of the utility model when viewed from above.

[0023] In the picture:

[0024] 1. Workbench; 2. Support plate; 3. Hydraulic cylinder; 4. Lower pressure plate; 5. Drive motor; 6. Bidirectional threaded rod; 7. Threaded sleeve; 8. Protective shell; 9. Horizontal slot; 10. Contact switch; 11. Sleeve; 12. Sleeve rod; 13. Push plate; 14. Support spring; 15. Electromagnet; 16. Cavity; 17. Placement plate; 18. Electric push rod; 19. Load-bearing column; 20. Extension plate. DETAILED DESCRIPTION

[0025] Embodiments of the present utility model:

[0026] Please refer to Figures 1 to 5 , a 3D printing concrete strength testing machine, including a workbench 1. A support plate 2 is fixedly connected to the upper surface of the workbench 1. A hydraulic cylinder 3 is fixedly connected to the support plate 2. The hydraulic cylinder 3 includes a movable end and a fixed end. The movable end of the hydraulic cylinder 3 is fixedly connected to a lower pressing plate 4. A driving motor 5 is fixedly connected to the upper surface of the workbench 1. The output shaft end of the driving motor 5 is fixedly connected to a bidirectional threaded rod 6. Extension plates 20 are symmetrically and fixedly connected to the upper surface of the workbench 1. Both ends of the bidirectional threaded rod 6 are rotatably connected to the extension plates 20 on the upper surface of the workbench 1. Two threaded sleeves 7 are threadedly connected to the outer surface of the bidirectional threaded rod 6. The outer surface of the bidirectional threaded rod 6 includes two sections of opposite threads. Therefore, when the bidirectional threaded rod 6 rotates, it can drive the two threaded sleeves 7 to approach and move away from each other. One end of each of the two threaded sleeves 7 is fixedly connected to a protective shell 8. There are two protective shells 8 in total. One side and the bottom surface of the two protective shells 8 facing each other are open, and the rest of the surfaces are closed. The protective shell 8 is transparent. One end of each of the two protective shells 8 facing each other is provided with a semi-hole adapted to the radius of the movable end of the hydraulic cylinder 3. The two semi-holes can be combined into a complete circular hole, and the size of the circular hole can allow the movable end of the hydraulic cylinder 3 to pass through. Two horizontal grooves 9 are opened on the upper surface of the workbench 1. Both protective shells 8 are slidably connected in the two horizontal grooves 9. A contact switch 10 is fixedly connected to the support plate 2.

[0027] Sleeves 11 are fixedly connected to the inner walls of both protective shells 8. A sleeve rod 12 is slidably connected in each sleeve 11. One end of the sleeve rod 12 away from the sleeve 11 is fixedly connected to a push plate 13. The push plate 13 is integrally U-shaped, and the inner sides of its two side surfaces are inclined planes. A support spring 14 is fixedly connected between the sleeve 11 and the sleeve rod 12. An electromagnet 15 is fixedly connected to one end of the sleeve 11 away from the sleeve rod 12. The sleeve rod 12 is made of iron material, and the electromagnet 15 generates magnetism when energized and adsorbs to the sleeve rod 12.

[0028] A square hole is opened at the center position of the workbench 1. A cavity 16 is opened on the side surface of the workbench 1. A placement plate 17 is slidably connected in the cavity 16. And when the placement plate 17 is located at the center position of the workbench 1, the edge of the placement plate 17 is located in the cavity 16 at the bottom of the workbench 1, playing a role in supporting the placement plate 17 by the workbench 1. An electric push rod 18 is fixedly connected to the bottom of the workbench 1. The telescopic end of the electric push rod 18 is fixedly connected to a bearing column 19. The bearing column 19 is fixedly connected to the bottom of the placement plate 17. The bearing column 19 plays a role in supporting the placement plate 17. A long strip-shaped notch through which the bearing column 19 can pass is opened at the bottom of the workbench 1. The notch is communicated with the square hole and the cavity 16. A pulley is installed at the bottom of the bearing column 19.

[0029] The following is the entire working process and working principle of the above embodiment:

[0030] Initial state: The two protective shells 8 are in a state of moving away from each other.

[0031] During use: First, place the concrete block to be tested on the placing plate 17. The hydraulic cylinder 3 is activated to drive the lower pressing plate 4 to descend and fit with the concrete block. Then, the driving motor 5 is activated to drive the bidirectional threaded rod 6 to rotate. The rotation of the bidirectional threaded rod 6 drives the two threaded sleeves 7 to move closer to the protective shells 8. The two protective shells 8 will move horizontally in the horizontal groove 9 until the mutually approaching ends of the protective shells 8 fit together, and the protective shells 8 fit with the movable end of the hydraulic cylinder 3. At this time, the movable end of the hydraulic cylinder 3 will continuously drive the lower pressing plate 4 to descend to apply pressure to the concrete block, so as to conduct a strength test.

[0032] Moreover, when the two protective shells 8 approach each other, the inner push plate 13 will first contact the concrete block. If the concrete block is not placed at the center position of the workbench 1. For example, if the concrete block deviates to the right, the right push plate 13 will first contact the concrete block and push the concrete block towards the middle until the push plates 13 on both the left and right sides contact the concrete block. And during this process, under the action of the inclined surfaces on both sides of the push plate 13, the front and rear positions of the concrete block will be gradually adjusted to the middle position. At this time, it means that the concrete block is located at the middle position of the workbench. As the protective shells 8 continue to approach, since the push plate 13 cannot move, the movement of the protective shells 8 will drive the sleeve 11 to slide on the outer surface of the sleeve rod 12 and compress the support spring 14. By the contraction of the support spring 14, concrete blocks of different sizes can be corrected, avoiding the situation that the concrete block to be tested is not in the middle position, so that the lower pressing plate 4 eccentrically presses on the concrete block, causing one side of the concrete block to bear a concentrated load first, resulting in non-uniform compression and leading to premature edge cracking and fragmentation, which cannot reflect the true compressive strength of the material.

[0033] Furthermore, when the two threaded sleeves 7 continue to approach until one of the threaded sleeves 7 contacts the contact switch 10, the contact switch 10 will transmit a signal to the controller. The controller turns off the driving motor 5 and turns on the power supply to the electromagnet 15. The electromagnet 15 generates magnetism and exerts an adsorption force on the sleeve rod 12, so as to adsorb the sleeve rod 12 to further slide in the sleeve 11 and compress the support spring 14, making the push plate 13 no longer fit on the outer surface of the concrete block, avoiding affecting the concrete block during the above-mentioned block pressing test, and the two protective shells 8 also stop moving after approaching and fitting together.

[0034] When the concrete block is broken, the compressive strength value of the concrete block can be obtained according to the pressurizing strength of the hydraulic cylinder 3. Then, the staff starts the driving motor 5 to drive the bidirectional threaded rod 6 to reverse rotate. The two threaded sleeves 7 drive the two protective shells 8 to move away from each other. At this time, the contact switch 10 no longer fits with the threaded sleeve 7, the electromagnet 15 is no longer energized, and the support spring 14 resets to drive the sleeve rod 12 to reset to its original state for the next use. Then, the staff can turn on the electric push rod 18. The telescopic end of the electric push rod 18 extends, and the placement plate 17 can be driven to slide in the cavity 16 through the bearing column 19, so that the placement plate 17 is separated from the square hole. During the process, the pulley at the bottom of the bearing column 19 will slide on the ground. At this time, the broken concrete block will fall from the bottom of the workbench 1, thus achieving the effect of automatically removing the concrete block, avoiding the scattered broken concrete blocks being difficult to collect and clean up. Quickly removing the concrete block is beneficial for the staff to quickly test the next concrete block and improve the efficiency of batch testing.

[0035] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 3D printing concrete strength testing machine, comprising a workbench (1), characterized in that: The upper surface of the workbench (1) is fixedly connected with a support plate (2). A hydraulic cylinder (3) is fixedly connected to the support plate (2). The movable end of the hydraulic cylinder (3) is fixedly connected with a lower pressing plate (4). A driving motor (5) is fixedly connected to the upper surface of the workbench (1). The output shaft end of the driving motor (5) is fixedly connected with a bidirectional threaded rod (6). Extension plates (20) are symmetrically and fixedly connected to the upper surface of the workbench (1). Both ends of the bidirectional threaded rod (6) are rotatably connected to the extension plates. Two threaded sleeves (7) are threadedly connected to the outer surface of the bidirectional threaded rod (6). One end of each of the two threaded sleeves (7) is fixedly connected with a protective shell (8). One side and the bottom surface of the two protective shells (8) facing each other are open, and the rest of the surfaces are closed; Sleeves (11) are fixedly connected to the inner walls of the two protective shells (8). A rod (12) is slidably connected to each sleeve (11). One end of the rod (12) away from the sleeve (11) is fixedly connected with a push plate (13). The push plate (13) is integrally U-shaped, and the inner sides of its two side surfaces are inclined planes. A support spring (14) is fixedly connected between the sleeve (11) and the rod (12).

2. The 3D printing concrete strength testing machine according to claim 1, characterized in that: A contact switch (10) is fixedly connected to the support plate (2). An electromagnet (15) is fixedly connected to one end of the sleeve (11) away from the rod (12). The rod (12) is made of iron, and the electromagnet (15) generates magnetism when energized and adsorbs the rod (12).

3. A 3D printing concrete strength testing machine according to claim 1, characterized in that: A square hole is opened at the center of the workbench (1), and a cavity (16) is opened on the side surface of the workbench (1). A placement plate (17) is slidably connected in the cavity (16).

4. The 3D printing concrete strength tester according to claim 3, characterized in that: An electric push rod (18) is fixedly connected to the bottom of the workbench (1). The telescopic end of the electric push rod (18) is fixedly connected with a bearing column (19). The bearing column (19) is fixedly connected to the bottom of the placement plate (17).

5. A 3D printing concrete strength testing machine according to claim 4, characterized in that: Two horizontal grooves (9) are opened on the upper surface of the workbench (1). The protective shell (8) is slidably connected in the two horizontal grooves (9).

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