Hydraulic concrete material bending fatigue test device

Abstract

The invention discloses a hydraulic concrete material bending fatigue test device, and belongs to the technical field of concrete tests.The hydraulic concrete material bending fatigue test device comprises a supporting and fixing plate, and a hydraulic device for applying pressure to a concrete material is arranged on the upper side of the supporting and fixing plate; the output end of the hydraulic device is provided with a pressing head used for directly loading the concrete material, one side of the pressing head is provided with a pressing and leveling assembly used for pressing and leveling the concrete material, and one side of the pressing and leveling assembly is provided with an opening and fastening unit used for fastening the two sides of the concrete material. The support fixing plate is provided with a balance adjusting assembly used for carrying out balance adjustment on a concrete material, and the dual effects improve the stability of placing the test piece, ensure that the test piece is kept in a stable posture in the whole test process, effectively avoid uneven stress caused by position deviation in the dynamic loading process of the test piece, and improve the stability of the test piece. Therefore, the accuracy and reliability of test data are remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of concrete testing, in particular to a hydraulic concrete material bending fatigue testing device. Background Art

[0002] The hydraulic concrete material bending fatigue test device is of great significance in the research of hydraulic structures. Hydraulic concrete structures are subjected to complex dynamic loads such as water flow impact and earthquakes for a long time, and their fatigue performance is directly related to the safety and durability of the structure.

[0003] In the field of bending fatigue testing of hydraulic concrete materials, the existing testing equipment has the following significant problems. First, the balance adjustment ability of concrete material specimens is insufficient. Traditional testing equipment is difficult to adapt to concrete materials of different shapes quickly and accurately, especially when the surface has a certain slope but the inclination angle is not large. This may cause uneven force on the specimen due to uneven placement in the initial stage of the test, resulting in errors in the bending fatigue test results of concrete materials. Second, the fastening effect is not good, and manual intervention in the position of the specimen is frequent, which makes it inconvenient to adapt to specimens of different shapes and sizes. The test preparation work is complicated, which reduces the test efficiency. Third, shaking and offset are easy to occur during the loading process, which makes it difficult to ensure the uniformity and stability of the force on the specimen. Summary of the Invention

[0004] The present invention aims to provide a hydraulic concrete material bending fatigue testing device. To achieve the above-mentioned object, the present invention provides the following technical solutions: comprising a support and fixing plate, a hydraulic device for applying pressure to a concrete material is provided on the upper side of the support and fixing plate, a pressure head for directly loading the concrete material is provided at the output end of the hydraulic device, a pressing and leveling assembly for pressing and leveling the concrete material is provided on one side of the pressure head, an opening and fastening unit for fastening both sides of the concrete material is provided on one side of the pressing and leveling assembly, and a balancing adjustment assembly for balancing the concrete material is provided on the support and fixing plate;

[0005] As a further preferred embodiment of the present technical solution: the press-leveling assembly includes a press-connecting plate provided on one side of the pressure head, and a connecting slide rod is slidably connected to the press-connecting plate, and a connecting spring is sleeved on the outer side of the connecting slide rod, and one end of the connecting slide rod is connected to the press-plate;

[0006] As a further preferred embodiment of the present technical solution: the pressing connecting plate is fixedly mounted on the pressure head for following the movement of the pressure head, and the pressing and leveling components are provided in two groups and are symmetrically arranged on both sides of the pressure head;

[0007] As a further preferred embodiment of the present technical solution: the opening and tightening unit includes a connecting slide cylinder arranged on the inner side of the pressing plate, and a connecting groove is provided on the inner side of the connecting slide cylinder, and a tightening spring is connected to the inner side of the connecting slide cylinder, and a ball is fitted on the outer side of the connecting slide cylinder for sliding rotation, and one end of the connecting slide cylinder is connected to a clamping plate, and the clamping plate is rotatably connected to a roller at one end away from the connecting slide cylinder, and the opening and tightening unit also includes a partition plate arranged in the middle position of the inner side of the pressing plate;

[0008] As a further preferred embodiment of the present technical solution: the connecting slide slides on the inner side of the pressing plate, and two groups of rollers are provided and symmetrically arranged on both sides of the pressing plate, and one end of the fastening spring is connected to one side of the partition, and the other end of the fastening spring is connected to the inner side of the connecting slide;

[0009] As a further preferred embodiment of the present technical solution: the balance adjustment assembly includes a connecting block arranged on the lower side of the support fixing plate, and a hydraulic connecting pipe is arranged on the inner side of the connecting block, and one end of the hydraulic connecting pipe is connected to a piston rod, and the upper end of the piston rod is connected to a connecting frame, and the supporting plate is rotatably connected to the connecting frame.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. In the present invention, automatic balancing and reliable tightening of concrete materials are achieved through the balancing adjustment component and the opening and tightening unit. The balancing adjustment component uses the hydraulic connecting pipe, piston rod and support plate with torsion spring to realize automatic leveling by the weight of the specimen itself. Whether the specimen is a regular plane or an inclined slope, the hydraulic oil can transmit pressure to drive the piston rod to drive the support plate to rise and fall until the specimen reaches a balanced state. The opening and tightening unit uses the roller to preferentially contact the raised end of the specimen, and cooperates with the elastic force of the tightening spring to make the splint tighten the two sides of the specimen in opposite directions. This dual action not only improves the stability of the specimen placement and ensures that the specimen maintains a stable posture throughout the test, but also effectively avoids the uneven force caused by position offset during the dynamic loading process of the specimen, thereby significantly improving the accuracy and reliability of the test data;

[0012] 2. In the present invention, the pressure-leveling assembly, through the coordinated action of the connecting spring, connecting slide bar, and pressing plate, can adjust the pressing force in real time according to the undulations of the specimen surface. When the specimen has an angular deviation, the roller first touches the raised end of the specimen, and with the help of the buffering effect of the pressing plate and connecting spring, the specimen is gradually adjusted to a horizontal state. The roller then rolls smoothly on the specimen surface to complete the tightening operation. This process does not require frequent manual intervention in the specimen position and can adapt to specimens of different shapes and sizes, greatly simplifying test preparation and improving test efficiency.

[0013] 3. In the present invention, the clamping plate is driven by the tightening spring to apply uniform pressure to both sides of the specimen, ensuring that the specimen is uniformly stressed as a whole. Combined with the continuous loading of the pressure head, the device can achieve stable dynamic loading of the concrete material. The synergistic effect of the balance adjustment component and the pressing and leveling component effectively reduces the shaking and deviation of the specimen during the loading process, thereby ensuring the uniformity and stability of the specimen's stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a hydraulic concrete material bending fatigue test device of the present invention. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the structure of a hydraulic concrete material bending fatigue test device of the present invention. Figure 2 ;

[0016] Figure 3 This is a partial structural diagram of a hydraulic concrete material bending fatigue testing device according to the present invention;

[0017] Figure 4 This is a partial structural section of a hydraulic concrete material bending fatigue test device of the present invention. Figure 1 ;

[0018] Figure 5 This is a partial structural explosion diagram of a hydraulic concrete material bending fatigue testing device according to the present invention;

[0019] Figure 6 The present invention is a partial structural cross-sectional view of a hydraulic concrete material bending fatigue testing device.

[0020] In the figure: 1. Support plate; 2. Hydraulic device; 3. Pressure head;

[0021] 4. Press the leveling assembly; 41. Press the connecting plate; 42. Connect the slide bar; 43. Connect the spring; 44. Press the plate;

[0022] 5. Open the fastening unit; 51. Connect the slide; 52. Connect the groove; 53. Fastening spring; 54. Ball; 55. Clamp; 56. Roller; 57. Partition;

[0023] 6. Balance adjustment assembly; 61. Connecting block; 62. Hydraulic connecting pipe; 63. Piston rod; 64. Connecting frame; 65. Support plate. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example

[0026] See also Figures 1-6 As shown, the present invention provides a technical solution for a hydraulic concrete material bending fatigue test device: it includes a supporting and fixing plate 1, a hydraulic device 2 for applying pressure to the concrete material is provided on the upper side of the supporting and fixing plate 1, a pressure head 3 for directly loading the concrete material is provided at the output end of the hydraulic device 2, a pressing and leveling component 4 for pressing and leveling the concrete material is provided on one side of the pressure head 3, an opening and fastening unit 5 for fastening both sides of the concrete material is provided on one side of the pressing and leveling component 4, and a balancing adjustment component 6 for balancing the concrete material is provided on the supporting and fixing plate 1.

[0027] In this embodiment, the pressing and leveling assembly 4 includes a pressing connecting plate 41 arranged on one side of the pressing head 3. The pressing connecting plate 41 is fixedly installed on the pressing head 3 for moving with the pressing head 3. The pressing and leveling assembly 4 is provided with two groups and is symmetrically arranged on both sides of the pressing head 3. A connecting slide rod 42 is slidingly connected through the pressing connecting plate 41, and a connecting spring 43 is sleeved on the outer side of the connecting slide rod 42. At the same time, one end of the connecting slide rod 42 is connected to a pressing plate 44, one end of the connecting spring 43 is connected to the upper side of the pressing plate 44, and the other end of the connecting spring 43 is connected to the lower side of the pressing connecting plate 41.

[0028] In this embodiment, the opening and fastening unit 5 includes a connecting slide 51 arranged on the inner side of the pressing plate 44, the connecting slide 51 slides on the inner side of the pressing plate 44, and a connecting groove 52 is provided on the inner side of the connecting slide 51, and a fastening spring 53 is connected to the inner side of the connecting slide 51, and at the same time, a ball 54 is fitted on the outer side of the connecting slide 51 for sliding rotation, and one end of the connecting slide 51 is connected to a splint 55, and the splint 55 is rotatably connected to an end of the connecting slide 51 away from the connecting slide 51, and the roller 56 is provided in two groups and is symmetrically arranged on both sides of the pressing plate 44, and at the same time, the opening and fastening unit 5 also includes a partition 57 arranged in the middle position of the inner side of the pressing plate 44, one end of the fastening spring 53 is connected to one side of the partition 57, and the other end of the fastening spring 53 is connected to the inner side of the connecting slide 51.

[0029] Specifically, several groups of balls 54 are evenly distributed on the inner side of the pressing plate 44 and are fitted on the outer side of the connecting slide 51 . The balls 54 are used to provide a stable moving operation for the connecting slide 51 .

[0030] In this embodiment, the balance adjustment assembly 6 includes a connecting block 61 arranged on the lower side of the support fixing plate 1, and a hydraulic connecting pipe 62 is arranged on the inner side of the connecting block 61. The hydraulic connecting pipe 62 is embedded in the inner side of the connecting block 61, and one end of the hydraulic connecting pipe 62 is connected to a piston rod 63. The piston rod 63 slides on the inner side of the hydraulic connecting pipe 62. At the same time, the upper end of the piston rod 63 is connected to a connecting frame 64, and a support plate 65 is rotatably connected to the connecting frame 64. The support plates 65 are provided in two groups and are symmetrically arranged. A torsion spring (not shown) is provided at the connection between the support plates 65 and the connecting frame 64, which is used to drive the support plates 65 to return to their original positions when not working.

[0031] Specifically, the hydraulic device 2 is a prior art device that ensures that all components of the system are in a standby state by starting the hydraulic pump, computer control system and related auxiliary equipment;

[0032] Input the parameters required for this test into the computer control system, including target pressure value, loading frequency, allowable range of pressure fluctuation, displacement limit, etc.

[0033] The pressure sensor and displacement sensor are activated by the computer control system to monitor the pressure and piston displacement of the hydraulic cylinder in real time;

[0034] The sensor converts the pressure and displacement signals into electrical signals, which are then converted into analog-to-digital signals (A / D) by the data acquisition card and then transmitted to the computer control system.

[0035] The computer control system compares the real-time collected pressure value with the set target pressure value and calculates the pressure deviation;

[0036] Based on the pressure deviation, a control algorithm (such as the PID control algorithm) is used to calculate the size and direction of the control signal. The PID control algorithm ensures the accuracy and stability of pressure regulation by adjusting the three parameters of proportional (P), integral (I) and differential (D).

[0037] The computer control system converts the calculated control signal into digital-to-analog (D / A) and transmits it to the hydraulic valve driver to adjust the opening of the hydraulic valve, thereby controlling the flow and speed of the hydraulic oil flowing into the hydraulic cylinder and achieving precise pressure regulation.

[0038] During the loading process, the computer control system automatically adjusts the loading parameters based on real-time displacement and pressure data. If abnormal deformation or pressure fluctuations outside the allowable range are detected, the system will automatically reduce the loading pressure or suspend loading to avoid premature failure of the specimen.

[0039] The computer control system displays the monitored parameters such as pressure and displacement on the screen in real time, so that the test personnel can visually observe the changes during the test;

[0040] When the preset number of tests, time or specimen damage standard is reached, the computer control system automatically terminates the test, closes the hydraulic valve, stops the hydraulic pump, resets the hydraulic cylinder piston to its initial position, and prepares for the next test.

[0041] Working principle or structural principle: First, by placing the concrete material block on two sets of support plates 65, when the surface of the concrete material block is an inclined surface, the heavy end of the concrete material block presses the support plate 65, driving the piston rod 63 to move downward, and at the same time, the hydraulic oil provided inside the hydraulic connecting pipe 62 drives the other set of piston rods 63 to move upward, and at the same time drives the other set of support plates 65 to move upward, and at the same time, the light end of the concrete material block moves upward. After rising to a certain position, the concrete material block remains balanced, and the uneven side of the concrete material block is adjusted by the balance adjustment component 6 to reduce the height difference;

[0042] When the concrete material block is tilted, the support plate 65 will follow the concrete material block to tilt;

[0043] By starting the hydraulic device 2, the pressure head 3 is driven to move downward, and at the same time, the pressing and leveling assembly 4 is driven to move downward, so that a group of rollers 56 are started to contact the end of the concrete block with a higher angle. The hydraulic device 2 continues to drive the pressure head 3 downward, so that the pressing connecting plate 41 presses the connecting spring 43 downward, and the elastic force of the connecting spring 43 applies pressure to the pressing plate 44. At the same time, the pressing plate 44 applies pressure to the connecting slide 51 and the clamping plate 55. The clamping plate 55 applies pressure to the roller 56 to press the end of the concrete block with a higher angle downward, driving the end of the concrete block with a higher angle to move downward, so that the other end of the concrete block moves upward, so that the two groups of rollers 56 contact the upper side of the concrete block together.

[0044] The hydraulic device 2 continues to drive the pressure head 3 downward, so that the pressing connecting plate 41 presses the connecting spring 43 downward, and the elastic force of the connecting spring 43 applies pressure to the pressing plate 44. At the same time, the pressing plate 44 applies pressure to the connecting slide 51 and the clamping plate 55, and the clamping plate 55 applies pressure to the roller 56, so that the roller 56 can rotate on the surface of the concrete material block, and at the same time drive the connecting slide 51 to slide on the ball 54. At the same time, the ball 54 rotates on the inner side of the pressing plate 44, so that the two sets of connecting slides 51 can move in the direction, and at the same time the connecting slide 51 pulls the fastening spring 53. At the same time, when the roller 56 is separated from the concrete material block, the pressing plate 44 continues to move downward, and the clamping plate 55 can be driven to move downward until the lower side of the pressing plate 44 is attached to the upper side of the concrete material block. The elastic force of the fastening spring 53 drives the two sets of clamping plates 55 to move in opposite directions, so as to tighten the two sides of the concrete material block.

[0045] The hydraulic device 2 continues to drive the pressure head 3 to move downward. When the pressing plate 44 is attached to the upper side of the concrete material block, the lower end of the pressure head 3 is also attached to the upper side of the concrete material block.

[0046] The hydraulic device 2 continues to drive the pressure head 3 to move downward, and the pressure head 3 performs a bending fatigue test on the concrete material block;

[0047] When the surface of the concrete block is flat, when the hydraulic device 2 drives the pressure head 3 to press downward, multiple sets of rollers 56 will press onto the concrete block at the same time, and at the same time, the opening and tightening units 5 will tighten both sides of the concrete block. At the same time, the two sets of pressing plates 44 and the pressure head 3 will be simultaneously attached to the concrete block, and the hydraulic device 2 will drive the pressure head 3 to perform a bending fatigue test operation on the concrete block.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic concrete material bending fatigue test device, characterized by: The invention comprises a supporting and fixing plate (1), wherein a hydraulic device (2) for applying pressure to a concrete material is provided on the upper side of the supporting and fixing plate (1), a pressure head (3) for directly loading the concrete material is provided at the output end of the hydraulic device (2), a pressing and leveling component (4) for pressing and leveling the concrete material is provided on one side of the pressure head (3), an opening and fastening unit (5) for fastening both sides of the concrete material is provided on one side of the pressing and leveling component (4), and a balancing adjustment component (6) for balancing and adjusting the concrete material is provided on the supporting and fixing plate (1).

2. A hydraulic concrete material bending fatigue testing device according to claim 1, characterized in that: The pressing and leveling assembly (4) includes a pressing connecting plate (41) arranged on one side of the pressing head (3), and a connecting slide rod (42) is slidably connected through the pressing connecting plate (41), and a connecting spring (43) is sleeved on the outer side of the connecting slide rod (42), and one end of the connecting slide rod (42) is connected to the pressing plate (44).

3. A hydraulic concrete material bending fatigue testing device according to claim 2, characterized in that: The pressing connection plate (41) is fixedly mounted on the pressing head (3) and is used to move along with the pressing head (3). The pressing and leveling components (4) are provided in two groups and are symmetrically arranged on both sides of the pressing head (3).

4. A hydraulic concrete material bending fatigue testing device according to claim 3, characterized in that: The opening and tightening unit (5) includes a connecting slide (51) arranged on the inner side of the pressing plate (44), and a connecting groove (52) is arranged on the inner side of the connecting slide (51), and a tightening spring (53) is connected to the inner side of the connecting slide (51), and a ball (54) is fitted and slidably rotated on the outer side of the connecting slide (51), and one end of the connecting slide (51) is connected to a clamping plate (55), and the end of the clamping plate (55) away from the connecting slide (51) is rotatably connected to a roller (56), and the opening and tightening unit (5) also includes a partition (57) arranged at the middle position of the inner side of the pressing plate (44).

5. The hydraulic concrete material bending fatigue testing device according to claim 4, characterized in that: The connecting slide (51) slides on the inner side of the pressing plate (44), and two groups of rollers (56) are provided and symmetrically arranged on both sides of the pressing plate (44), and one end of the fastening spring (53) is connected to one side of the partition (57), and the other end of the fastening spring (53) is connected to the inner side of the connecting slide (51).

6. The hydraulic concrete material bending fatigue testing device according to claim 5, characterized in that: The balance adjustment assembly (6) includes a connecting block (61) arranged on the lower side of the support fixing plate (1), and a hydraulic connecting pipe (62) is arranged on the inner side of the connecting block (61), and one end of the hydraulic connecting pipe (62) is connected to a piston rod (63), and the upper end of the piston rod (63) is connected to a connecting frame (64), and the connecting frame (64) is rotatably connected to a support plate (65).

Images