Crack resistance detection device for high-strength concrete of modified cooling tower

Abstract

The invention discloses a modified cooling tower high-strength concrete anti-cracking performance detection device, which comprises a pressure-bearing seat and a hydraulic test mechanism, four corners of the pressure-bearing seat and the hydraulic test mechanism are provided with stand columns, and four corners of the top of the pressure-bearing seat are provided with pressure sensors. A fixed-point pressure applying mechanism is installed on the side, opposite to the hydraulic testing mechanism, of the pressure sensor. The device has the advantage of good flexibility, and solves the problems that a loading position may deviate from an ideal stress center of a test piece due to the fact that a pressure applying point of a concrete block is inconvenient to quickly adjust in a use process of an existing crack resistance detection device for the high-strength concrete of the modified cooling tower, and the eccentric loading may cause extra bending moment or shearing force, so that the crack resistance of the high-strength concrete of the modified cooling tower is influenced. The measured stress and strain relation is distorted, and the real mechanical property of the material cannot be accurately reflected.

Description

Technical Field

[0001] This invention relates to the field of performance testing technology, specifically to a device for testing the crack resistance of modified high-strength concrete for cooling towers. Background Technology

[0002] Modified high-strength concrete for cooling towers refers to high-strength concrete specifically designed for cooling tower structures. Its performance is improved by adding specific modifying materials or using special mix proportions and techniques to meet the high requirements for material strength, durability, and crack resistance in the unique environment of cooling towers. Before use, modified high-strength concrete for cooling towers requires crack resistance testing. The cooling tower structure bears its own weight and various dynamic loads during operation. These loads, combined with the creep and shrinkage of the concrete itself, may lead to unpredictable cracks in the structure.

[0003] If initial small cracks are not controlled in time, they may gradually expand and deepen over time, seriously affecting the overall stability and durability of the cooling tower, and even threatening the safe operation of the facility. Therefore, it is necessary to conduct crack resistance testing on the high-strength concrete of the modified cooling tower. During crack resistance testing, a constant-load hydraulic device is used to apply a stable mechanical load to the concrete specimen to simulate the pressure conditions in actual use. After the pressure is applied, the cracks in the concrete block are detected, and the crack width, length, and distribution are analyzed to calculate the crack resistance of the concrete block.

[0004] Existing testing devices for the crack resistance of high-strength concrete in modified cooling towers are not convenient for quickly adjusting the pressure point of the concrete block during use. This may cause the loading position to deviate from the ideal stress center of the specimen. Such eccentric loading will cause additional bending moment or shear force, resulting in distortion of the measured stress and strain relationship, and failing to accurately reflect the true mechanical properties of the material. Summary of the Invention

[0005] The purpose of this invention is to provide a crack resistance testing device for modified high-strength concrete in cooling towers, which has the advantage of good flexibility. It solves the problem that existing crack resistance testing devices for modified high-strength concrete in cooling towers are not convenient for quick adjustment of the pressure point of the concrete block during use, which may cause the loading position to deviate from the ideal stress center of the specimen. This eccentric loading will cause additional bending moment or shear force, resulting in distortion of the measured stress and strain relationship, and failing to accurately reflect the true mechanical properties of the material.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a crack resistance testing device for high-strength concrete of modified cooling towers, comprising a pressure bearing seat and a hydraulic testing mechanism, wherein columns are installed at the four corners of the pressure bearing seat and the hydraulic testing mechanism, pressure sensors are installed at the four corners of the top of the pressure bearing seat, and a fixed-point pressure application mechanism is installed on the side opposite to the pressure sensors and the hydraulic testing mechanism.

[0007] A lifting assembly is installed on the rear side of the pressure bearing seat, and a tilting mechanism is installed on the top of the lifting assembly. A clamping mechanism is installed on the rotating end of the tilting mechanism. The clamping mechanism is located on the opposite side of the two fixed-point pressure applying mechanisms to clamp the concrete.

[0008] As a preferred embodiment of the crack resistance testing device for modified high-strength concrete of cooling towers according to the present invention, a base is fixedly installed at the bottom of the pressure bearing seat, the bottom of the column is fixedly connected to the four corners of the base, a controller is fixedly installed on the surface of the base, and an installation seat is fixedly connected to the bottom of the base.

[0009] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, the hydraulic testing mechanism includes a receiving base with a receiving cavity inside. A cylinder is slidably connected to the inner wall of the receiving cavity, and a pressure plate is fixedly connected to the bottom of the cylinder. A fixed-point pressure application mechanism is installed at the bottom of the pressure plate. A first hydraulic cylinder is fixedly installed at the top of the receiving base, and the piston rod of the first hydraulic cylinder extends to the receiving cavity and is fixedly connected to the top of the pressure plate. Mounting holes are provided at the four corners of the receiving base, and the column is fixedly installed in the mounting holes.

[0010] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, the fixed-point pressure mechanism includes a mounting plate, which is mounted on a pressure plate and a pressure sensor. A T-shaped groove is provided on one side of the mounting plate, and a T-shaped bolt is installed inside the T-shaped groove. A fixing plate is movably fitted on the surface of the T-shaped bolt, and a mounting nut is provided on one side of the fixing plate. The mounting nut is threaded onto the surface of the T-shaped bolt.

[0011] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, a frame is fixedly connected to the fixed plate, a threaded rod is rotatably connected inside the frame, a threaded sleeve is threaded on the surface of the threaded rod, the surface of the threaded sleeve is slidably connected to the inner wall of the frame, and one end of the threaded sleeve extends to the outside of the frame and is threadedly connected to a pressure head.

[0012] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, the lifting assembly includes a support base, a lifting rod fixedly connected to the bottom of the support base, a handle fixedly connected to the bottom of the lifting rod, a sliding sleeve slidably connected to the surface of the lifting rod, a connecting plate fixedly connected to the surface of the sliding sleeve, and the connecting plate fixedly installed on the rear side of the pressure bearing base.

[0013] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, a return spring is movably sleeved on the surface of the lifting rod, the return spring is located on the opposite side of the sliding sleeve and the support seat, a threaded hole is opened on the surface of the lifting rod, a fastener is installed on the surface of the sliding sleeve, and the fastener extends into the inner cavity of the threaded hole and is threadedly connected thereto.

[0014] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, the flipping mechanism includes a frame, which is fixedly installed on the top of the support base. A gear is rotatably connected to the front side of the frame, and a rotating component is fixedly connected to one end of the gear. The rotating component is rotatably connected to the top of the support base.

[0015] As a preferred embodiment of the crack resistance testing device for high-strength concrete in modified cooling towers according to the present invention, a geared motor is fixedly installed on the rear side of the frame, a drive plate is installed on the output shaft of the geared motor, the drive plate is rotatably connected to the front side of the frame, a slide rod is installed on the end of the drive plate away from the output shaft of the geared motor, a hollow movable frame is slidably connected to the surface of the slide rod, a rack is fixedly connected to the surface of the hollow movable frame, the bottom of the rack meshes with the top of the gear, a limiting sleeve is movably sleeved on the surface of the rack, and the limiting sleeve is fixedly installed on the frame.

[0016] Preferably, in the present invention, a device for testing the crack resistance of high-strength concrete for modified cooling towers includes a clamping mechanism comprising a first circular plate, a second circular plate fixedly mounted on one end of the first circular plate, the second circular plate being fixedly mounted on a rotating component, a second hydraulic cylinder fixedly mounted on the other end of the first circular plate, a third circular plate being fixedly connected to the piston rod of the second hydraulic cylinder, a plurality of connecting rods being rotatably connected to the surface of the third circular plate, a clamping arm being rotatably connected to the end of the connecting rods away from the third circular plate, one end of the clamping arm being rotatably connected to the surface of the first circular plate, and a clamping head being provided at the other end of the clamping arm, the clamping head clamping the concrete block located at the pressure application position of the pressure head.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This invention significantly improves the accuracy and reliability of concrete crack resistance testing through a precise hydraulic pressure system and intelligent real-time monitoring. The fixed-point pressure mechanism, with its threaded rod, threaded sleeve, and replaceable pressure head, allows for flexible adjustment of the pressure position and area to adapt to concrete specimens of different sizes or shapes, ensuring uniform pressure distribution and avoiding misjudgments caused by localized stress concentration. The pressure sensor and controller work together to collect pressure data in real time and dynamically adjust the loading rate of the hydraulic cylinder to prevent overload damage. Simultaneously, a preset program precisely controls the termination conditions, reducing human error. The flipping mechanism, driven by a geared motor and a rack and pinion transmission system, enables multi-angle rotation of the specimen. Combined with the stable clamping function of the clamping mechanism, repeated pressure tests can be performed on different surfaces of the concrete specimen to comprehensively evaluate its crack resistance and avoid the limitations of single-sided observation.

[0019] 2. This invention improves the practicality and stability of the equipment and reduces operational complexity through modular design and efficient mechanical linkage structure. The lifting component, combined with a return spring and fasteners, supports both manual height adjustment and quick fixation by screwing in the fasteners. The return spring automatically springs back to the initial position, simplifying the specimen replacement process and saving time. The clamping mechanism adopts a linkage design of a second hydraulic cylinder and a connecting rod. The clamping arm moves the clamping head inward or outward through the extension and retraction of the hydraulic cylinder, ensuring uniform distribution of clamping force and preventing specimen slippage or premature damage due to excessive clamping. It is especially suitable for crack resistance testing of high-strength concrete. The frame is detachably connected to the mounting plate by T-bolts, facilitating the replacement of worn parts. At the same time, the device supports quick replacement of pressure heads of different shapes, adapting to various crack resistance testing needs and significantly improving the versatility and maintenance efficiency of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0022] Figure 3 This is a cross-sectional view of the hydraulic testing mechanism of the present invention;

[0023] Figure 4 This is an exploded view of the fixed-point pressure application mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram of the lifting mechanism structure of the present invention. Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the lifting mechanism structure of the present invention. Figure 2 ;

[0026] Figure 7This is a schematic diagram of the flipping mechanism structure of the present invention. Figure 1 ;

[0027] Figure 8 This is a schematic diagram of the flipping mechanism structure of the present invention. Figure 2 ;

[0028] Figure 9 This is a schematic diagram of the clamping mechanism of the present invention. Figure 1 ;

[0029] Figure 10 This is a schematic diagram of the clamping mechanism of the present invention. Figure 2 .

[0030] In the diagram: 1. Pressure bearing seat; 2. Hydraulic testing mechanism; 3. Column; 4. Pressure sensor; 5. Fixed-point pressure application mechanism; 6. Lifting assembly; 7. Tilting mechanism; 8. Clamping mechanism; 9. Base; 10. Controller; 11. Mounting seat; 201. Storage seat; 202. Storage cavity; 203. Cylinder; 204. First hydraulic cylinder; 205. Pressure plate; 206. Mounting hole; 501. Mounting plate; 502. Frame; 503. Pressure head; 504. Threaded rod; 505. Threaded sleeve; 506. Mounting nut; 507. T-bolt; 508. T-slot; 509. Fixed plate; 601, support base; 602, lifting rod; 603, return spring; 604, fastener; 605, connecting plate; 606, sliding sleeve; 607, handle; 608, threaded hole; 701, frame; 702, sliding rod; 703, geared motor; 704, drive plate; 705, hollow moving frame; 706, rack; 707, gear; 708, limit sleeve; 709, rotating component; 801, first circular plate; 802, third circular plate; 803, clamping head; 804, clamping arm; 805, connecting rod; 806, second hydraulic cylinder; 807, second circular plate. Detailed Implementation

[0031] Please see Figures 1-10 A device for testing the crack resistance of high-strength concrete for modified cooling towers includes a pressure-bearing base 1 and a hydraulic testing mechanism 2. Columns 3 are installed at the four corners of the pressure-bearing base 1 and the hydraulic testing mechanism 2. Pressure sensors 4 are installed at the four corners of the top of the pressure-bearing base 1. A fixed-point pressure application mechanism 5 is installed on the side opposite to the pressure sensors 4 and the hydraulic testing mechanism 2.

[0032] Furthermore, a lifting assembly 6 is installed on the rear side of the pressure bearing seat 1, a tilting mechanism 7 is installed on the top of the lifting assembly 6, and a clamping mechanism 8 is installed on the rotating end of the tilting mechanism 7. The clamping mechanism 8 is located on the opposite side of the two fixed-point pressure applying mechanisms 5 to clamp the concrete.

[0033] Furthermore, a base 9 is fixedly installed at the bottom of the pressure bearing seat 1, the bottom of the column 3 is fixedly connected to the four corners of the base 9, a controller 10 is fixedly installed on the surface of the base 9, and an installation seat 11 is fixedly connected to the bottom of the base 9.

[0034] Furthermore, the hydraulic testing mechanism 2 includes a storage base 201, with a storage cavity 202 inside the storage base 201. A cylinder 203 is slidably connected to the inner wall of the storage cavity 202, and a pressure plate 205 is fixedly connected to the bottom of the cylinder 203. A fixed-point pressure application mechanism 5 is installed at the bottom of the pressure plate 205. A first hydraulic cylinder 204 is fixedly installed on the top of the storage base 201. The piston rod of the first hydraulic cylinder 204 extends to the storage cavity 202 and is fixedly connected to the top of the pressure plate 205. Mounting holes 206 are opened at the four corners of the storage base 201, and the column 3 is fixedly installed in the mounting holes 206.

[0035] Furthermore, the fixed-point pressure application mechanism 5 includes a mounting plate 501, which is mounted on the pressure plate 205 and the pressure sensor 4. A T-shaped groove 508 is provided on one side of the mounting plate 501, and a T-shaped bolt 507 is installed inside the T-shaped groove 508. A fixing plate 509 is movably sleeved on the surface of the T-shaped bolt 507, and a mounting nut 506 is provided on one side of the fixing plate 509. The mounting nut 506 is threaded onto the surface of the T-shaped bolt 507.

[0036] Furthermore, a frame 502 is fixedly connected to the fixing plate 509, and a threaded rod 504 is rotatably connected inside the frame 502. A threaded sleeve 505 is threadedly fitted on the surface of the threaded rod 504. The surface of the threaded sleeve 505 is slidably connected to the inner wall of the frame 502. One end of the threaded sleeve 505 extends to the outside of the frame 502 and is threadedly connected to a pressure head 503.

[0037] In the operation of the fixed-point pressure application mechanism 5, the position of the pressure head 503 is adjusted in advance according to the test position of the concrete specimen. During the adjustment, the threaded rod 504 is rotated by handwheel. The threaded rod 504 drives the threaded sleeve 505 to slide on the inner wall of the frame 502. The threaded sleeve 505 and the inner wall of the frame 502 are in contact to prevent the threaded sleeve 505 from rotating during movement. The threaded sleeve 505 drives the pressure head 503 to move, thereby adjusting the position of the pressure head 503. The pressure head 503 and the threaded sleeve 505 are threadedly connected. Through the threaded connection, different shapes of pressure heads 503 can be replaced to change the pressure area. Moreover, the frame 502 is fixed to the mounting plate 501 by T-bolts 507, mounting nuts 506 and fixing plates 509, which facilitates the disassembly and maintenance of the frame 502 and the threaded rod 504.

[0038] Furthermore, the lifting assembly 6 includes a support base 601, a lifting rod 602 fixedly connected to the bottom of the support base 601, a handle 607 fixedly connected to the bottom of the lifting rod 602, a sliding sleeve 606 slidably connected to the surface of the lifting rod 602, a connecting plate 605 fixedly connected to the surface of the sliding sleeve 606, and the connecting plate 605 fixedly installed on the rear side of the pressure seat 1.

[0039] Furthermore, a return spring 603 is movably sleeved on the surface of the lifting rod 602. The return spring 603 is located on the opposite side of the sliding sleeve 606 and the support seat 601. A threaded hole 608 is opened on the surface of the lifting rod 602. A fastener 604 is installed on the surface of the sliding sleeve 606. The fastener 604 extends into the inner cavity of the threaded hole 608 and is threadedly connected to it.

[0040] During the operation of the lifting assembly 6, the operator pulls the lifting rod 602 through the handle 607 to slide it inside the sliding sleeve 606, thereby adjusting the height of the flipping mechanism 7, the clamping mechanism 8, and the concrete specimen. After adjustment, the fastener 604 is screwed through the sliding sleeve 606 into the threaded hole 608 to fix the lifting rod 602. When it is necessary to reset the lifting rod 602, the fastener 604 is unscrewed, and the reset spring 603 drives the support base 601 to move upward to reset the lifting rod 602.

[0041] Furthermore, the flipping mechanism 7 includes a frame 701, which is fixedly installed on the top of the support base 601. A gear 707 is rotatably connected to the front side of the frame 701, and a rotating component 709 is fixedly connected to one end of the gear 707. The rotating component 709 is rotatably connected to the top of the support base 601.

[0042] Furthermore, a geared motor 703 is fixedly installed on the rear side of the frame 701. A drive plate 704 is installed on the output shaft of the geared motor 703. The drive plate 704 is rotatably connected to the front side of the frame 701. A slide rod 702 is installed on the end of the drive plate 704 away from the output shaft of the geared motor 703. A hollow movable frame 705 is slidably connected to the surface of the slide rod 702. A rack 706 is fixedly connected to the surface of the hollow movable frame 705. The bottom of the rack 706 meshes with the top of the gear 707. A limiting sleeve 708 is movably sleeved on the surface of the rack 706. The limiting sleeve 708 is fixedly installed on the frame 701.

[0043] During the operation of the flipping mechanism 7, the controller 10 controls the reduction motor 703. The output shaft of the reduction motor 703 drives the drive plate 704 and the slide rod 702 to rotate. During the rotation of the slide rod 702, it slides inside the hollow moving frame 705, thereby driving the hollow moving frame 705 and the rack 706 to move left and right. When the rack 706 moves, the limiting sleeve 708 limits it to prevent it from deviating. The movement of the rack 706 drives the gear 707 and the rotating part 709 to rotate, thereby adjusting the clamping angle of the clamping mechanism 8 and the concrete specimen.

[0044] Furthermore, the clamping mechanism 8 includes a first circular plate 801, a second circular plate 807 fixedly mounted on one end of the first circular plate 801, the second circular plate 807 fixedly mounted on the rotating member 709, a second hydraulic cylinder 806 fixedly mounted on the other end of the first circular plate 801, a third circular plate 802 fixedly connected to the piston rod of the second hydraulic cylinder 806, a plurality of connecting rods 805 rotatably connected to the surface of the third circular plate 802, a clamping arm 804 rotatably connected to the end of the connecting rod 805 away from the third circular plate 802, one end of the clamping arm 804 rotatably connected to the surface of the first circular plate 801, and a clamping head 803 provided at the other end of the clamping arm 804, the clamping head 803 clamping the concrete block located at the pressure position of the pressure head 503.

[0045] During the operation of the clamping mechanism 8, the second hydraulic cylinder 806 drives the third circular plate 802 to extend or retract, thereby driving the connecting rod 805 and the clamping arm 804 to retract outward or inward. When the clamping arm 804 retracts inward, it drives the clamping head 803 to clamp and fix the surface of the concrete specimen. When the clamping arm 804 extends outward, it drives the clamping head 803 to release the concrete specimen.

[0046] When testing the crack resistance of high-strength concrete for modified cooling towers, concrete specimens are poured according to standard dimensions, cured to the specified age, and the surface of the concrete specimens is flat and without obvious defects. The concrete specimens are placed on top of the pressure seat 1, and the two sides of the specimens are clamped by the clamping arms 804 and clamping heads 803 of the clamping mechanism 8 to ensure that the specimens are firmly fixed and the force is uniform. The clamping head 803 adjusts the clamping force through the second hydraulic cylinder 806 and the connecting rod 805 to prevent the specimens from slipping or prematurely breaking. After clamping, the clamping mechanism 8 and the concrete specimens are rotated by the flipping mechanism 7 to adjust the pressure position. The flipping mechanism 7 and the clamping mechanism 8 are moved downward by the lifting component 6 to place the concrete specimens on the fixed-point pressure mechanism 5 at the bottom. After placement, the hydraulic testing mechanism 2 is started.

[0047] After the hydraulic testing mechanism 2 is started, the first hydraulic cylinder 204 works. The piston rod of the first hydraulic cylinder 204 drives the fixed-point pressure mechanism 5 at the top to move downward through the pressure plate 205, applying vertical pressure to the specimen. The pressure is transmitted to the surface of the specimen through the fixed-point pressure mechanism 5 at the bottom of the pressure plate 205. The pressure sensor 4 monitors the applied pressure value in real time and transmits the data to the controller 10 to control the loading rate and termination conditions of the hydraulic cylinder. The controller 10 automatically adjusts the stroke of the first hydraulic cylinder 204 according to the preset program to avoid sudden failure of the specimen due to overload. After the pressure test time is reached, the location, direction of expansion and width of the crack are observed through the crack width measuring instrument. The first appearance time, crack length and crack width are recorded, and the crack resistance of the concrete specimen is calculated based on the recorded data. After one part is measured, a new concrete specimen is prepared. The concrete specimen is flipped by the flipping mechanism 7 to apply pressure to other parts and test the crack resistance of the concrete specimen after being compressed at different parts.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the crack resistance of modified high-strength concrete for cooling towers, comprising a pressure-bearing base (1) and a hydraulic testing mechanism (2), characterized in that: The pressure bearing seat (1) and the hydraulic testing mechanism (2) are equipped with columns (3) at their four corners. Pressure sensors (4) are installed at the top four corners of the pressure bearing seat (1). A fixed-point pressure application mechanism (5) is installed on the side opposite to the pressure sensor (4) and the hydraulic testing mechanism (2). A lifting assembly (6) is installed on the rear side of the pressure bearing seat (1). A flipping mechanism (7) is installed on the top of the lifting assembly (6). A clamping mechanism (8) is installed on the rotating end of the flipping mechanism (7). The clamping mechanism (8) is located on the opposite side of the two fixed-point pressure applying mechanisms (5) to clamp the concrete.

2. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 1, characterized in that: The pressure bearing seat (1) is fixedly installed with a base (9) at the bottom. The bottom of the column (3) is fixedly connected to the four corners of the base (9). A controller (10) is fixedly installed on the surface of the base (9). An installation seat (11) is fixedly connected to the bottom of the base (9).

3. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 2, characterized in that: The hydraulic testing mechanism (2) includes a storage base (201), a storage cavity (202) is provided inside the storage base (201), a cylinder (203) is slidably connected to the inner wall of the storage cavity (202), a pressure plate (205) is fixedly connected to the bottom of the cylinder (203), the fixed-point pressure mechanism (5) is installed at the bottom of the pressure plate (205), a first hydraulic cylinder (204) is fixedly installed on the top of the storage base (201), the piston rod of the first hydraulic cylinder (204) extends to the storage cavity (202) and is fixedly connected to the top of the pressure plate (205), the storage base (201) has mounting holes (206) at the four corners, and the column (3) is fixedly installed in the mounting holes (206).

4. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 3, characterized in that: The fixed-point pressure application mechanism (5) includes a mounting plate (501), which is mounted on the pressure plate (205) and the pressure sensor (4). A T-shaped groove (508) is provided on one side of the mounting plate (501), and a T-shaped bolt (507) is installed inside the T-shaped groove (508). A fixing plate (509) is movably sleeved on the surface of the T-shaped bolt (507), and a mounting nut (506) is provided on one side of the fixing plate (509). The mounting nut (506) is threaded onto the surface of the T-shaped bolt (507).

5. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 4, characterized in that: A frame (502) is fixedly connected to the fixing plate (509). A threaded rod (504) is rotatably connected inside the frame (502). A threaded sleeve (505) is threadedly fitted on the surface of the threaded rod (504). The surface of the threaded sleeve (505) is slidably connected to the inner wall of the frame (502). One end of the threaded sleeve (505) extends to the outside of the frame (502) and is threadedly connected to a pressure head (503).

6. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 5, characterized in that: The lifting assembly (6) includes a support base (601), a lifting rod (602) is fixedly connected to the bottom of the support base (601), a handle (607) is fixedly connected to the bottom of the lifting rod (602), a sliding sleeve (606) is slidably connected to the surface of the lifting rod (602), a connecting plate (605) is fixedly connected to the surface of the sliding sleeve (606), and the connecting plate (605) is fixedly installed on the rear side of the pressure seat (1).

7. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 6, characterized in that: A return spring (603) is movably sleeved on the surface of the lifting rod (602). The return spring (603) is located on the opposite side of the sliding sleeve (606) and the support seat (601). A threaded hole (608) is opened on the surface of the lifting rod (602). A fastener (604) is installed on the surface of the sliding sleeve (606). The fastener (604) extends into the inner cavity of the threaded hole (608) and is threadedly connected to it.

8. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 7, characterized in that: The flipping mechanism (7) includes a frame (701), which is fixedly installed on the top of the support base (601). A gear (707) is rotatably connected to the front side of the frame (701), and a rotating component (709) is fixedly connected to one end of the gear (707). The rotating component (709) is rotatably connected to the top of the support base (601).

9. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 8, characterized in that: A geared motor (703) is fixedly installed on the rear side of the frame (701). A drive plate (704) is installed on the output shaft of the geared motor (703). The drive plate (704) is rotatably connected to the front side of the frame (701). A slide rod (702) is installed on the end of the drive plate (704) away from the output shaft of the geared motor (703). A hollow movable frame (705) is slidably connected to the surface of the slide rod (702). A rack (706) is fixedly connected to the surface of the hollow movable frame (705). The bottom of the rack (706) meshes with the top of the gear (707). A limiting sleeve (708) is movably sleeved on the surface of the rack (706). The limiting sleeve (708) is fixedly installed on the frame (701).

10. The crack resistance testing device for modified high-strength concrete in cooling towers according to claim 9, characterized in that: The clamping mechanism (8) includes a first circular plate (801), a second circular plate (807) is fixedly installed at one end of the first circular plate (801), the second circular plate (807) is fixedly installed on the rotating part (709), a second hydraulic cylinder (806) is fixedly installed at the other end of the first circular plate (801), the piston rod of the second hydraulic cylinder (806) is fixedly connected to a third circular plate (802), a plurality of connecting rods (805) are rotatably connected to the surface of the third circular plate (802), a clamping arm (804) is rotatably connected to the end of the connecting rod (805) away from the third circular plate (802), one end of the clamping arm (804) is rotatably connected to the surface of the first circular plate (801), and the other end of the clamping arm (804) is provided with a clamping head (803), the clamping head (803) clamps the concrete block located at the pressure position of the pressure head (503).

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