A building material strength testing device

Abstract

This invention relates to the field of strength testing technology and discloses a strength testing device for building materials. The device includes a support frame with U-shaped legs at both ends and a U-shaped leg in the middle. It also includes a pressing mechanism and a supporting mechanism. The pressing mechanism includes a pressing cylinder located on the side of the U-shaped leg away from the ground. A pressing piston is slidably connected to the middle of the pressing cylinder. A pressing column, slidably connected to the pressing cylinder, is located in the middle of the pressing piston. A lifting platform, slidably connected to the U-shaped leg, is located at the end of the pressing column near the ground. A pressing head is located in the middle of the lifting platform. Dynamic pressing components and stable pressing components for adjusting the internal pressure of the pressing cylinder are located on both sides of the U-shaped leg. This invention innovatively integrates a dual-mode collaborative control system of stable and dynamic pressing components, enabling the pressing head to simultaneously apply two fundamentally different types of loads.

Description

Technical Field

[0001] This invention relates to the field of strength testing technology, specifically a strength testing device for building materials. Background Technology

[0002] As an indispensable key structural material in construction engineering, the mechanical properties of steel reinforcement, especially its strength indicators, directly affect the safety, durability, and stability of the overall building. Therefore, rigorous and standardized strength testing of steel reinforcement is a mandatory requirement to ensure project quality during material arrival, component fabrication, and project acceptance. Currently, the industry standards specify steel reinforcement strength testing methods mainly including tensile testing (determining yield strength, tensile strength, and elongation) and bending testing (assessing its plastic deformation capacity and technological performance). Among these, the bending test often employs the classic three-point bending method, which, under standard laboratory conditions, can effectively provide strength data of steel reinforcement under static dead loads, providing a fundamental basis for material selection and acceptance in engineering projects.

[0003] However, a deeper analysis of the actual service environment of buildings throughout their entire life cycle reveals significant limitations in existing testing technologies and equipment. Building structures not only bear static dead loads (such as their own weight and the weight of fixed equipment), but are also frequently exposed to complex dynamic load environments, such as traffic vibrations, mechanical impacts, wind load fluctuations, and even earthquakes. The essential characteristic of these dynamic loads is that the forces applied to the structure exhibit non-constant, time-varying characteristics, including amplitude variations, frequency variations, and even impact effects. The core design goal of existing conventional steel reinforcement strength testing equipment (especially bending test equipment) is to accurately apply and measure static or quasi-static force values. Their loading mechanisms can typically only provide slow, uniform, or constant pressure (or displacement), completely failing to simulate the dynamic alternating loads or impact loads commonly present in the aforementioned actual working conditions. This static loading mode is significantly out of sync with the complex dynamic environment that steel reinforcement may encounter in actual service, making it difficult to truly reflect the material's response characteristics under dynamic stress states, and also failing to fully expose its potential failure modes and weak points under alternating stress or impact loads. Therefore, in order to more realistically and comprehensively evaluate the performance of steel reinforcement materials in practical engineering applications, especially their mechanical behavior and failure resistance under simulated real service environments (especially vibration and impact environments), it is urgent to develop a new type of strength testing device. Summary of the Invention

[0004] This invention provides a building material strength testing device, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A building material strength testing device includes a support frame with U-shaped legs at both ends and a U-shaped leg in the middle. It also includes a pressing mechanism and a support mechanism. The pressing mechanism includes a pressing cylinder located on the side of the U-shaped leg away from the ground. A pressing piston is slidably connected to the middle of the pressing cylinder. A pressing column, slidably connected to the pressing cylinder, is located in the middle of the pressing piston. A lifting platform, slidably connected to the U-shaped leg, is located at the end of the pressing column near the ground. A pressing head is located in the middle of the lifting platform. Dynamic pressing components and stable pressing components for adjusting the internal pressure of the pressing cylinder are located on both sides of the U-shaped leg. The support mechanism includes a bearing column located on the end of the U-shaped leg away from the ground. Sides of a flip-up frame are rotatably connected to both sides of the bearing column. A clamping component is located at the end of the flip-up frame away from the ground. The reinforcing bar to be tested is placed between the clamping component and the bearing column. An angle locking component restricting the rotation of the flip-up frame is located on the side of the U-shaped leg near the ground.

[0007] In a preferred embodiment of the present invention, the stabilizing pressure assembly includes a stabilizing pressure cylinder fixedly connected to a U-shaped support leg. A first piston is slidably connected inside the stabilizing pressure cylinder, and lifting screws, threadedly connected to the first piston, are rotatably connected to both ends of the stabilizing pressure cylinder. A first support plate, fixedly connected to the U-shaped support leg and a pressing cylinder, is provided at the end of the stabilizing pressure cylinder near the ground. A first motor is provided on the side of the U-shaped support leg, and the output shaft of the first motor is connected to the end of the lifting screw via a first belt.

[0008] In a preferred embodiment of the present invention, the dynamic pressure application assembly includes a dynamic pressure application cylinder fixedly connected to a U-shaped support leg. A second piston is slidably connected inside the dynamic pressure application cylinder. A support frame is provided on the side of the U-shaped support leg away from the ground. A tilting shaft is rotatably connected to the support frame, and a tilting plate is fixedly connected to the tilting shaft. A support plate is rotatably connected to the side of the tilting plate away from the tilting shaft. A lifting slide rod, fixedly connected to the second piston, is rotatably connected to the end of the support plate away from the tilting plate. The diameter of the first piston is larger than that of the second piston and the lowering piston. The side of the dynamic pressure application cylinder away from the ground is connected to the side of the lowering cylinder away from the ground via a second connecting pipe. The side of the stable pressure application cylinder away from the ground is connected to the side of the lowering cylinder away from the ground via a first connecting pipe.

[0009] As a preferred embodiment of the present invention, a second motor is provided on the side of the U-shaped support leg away from the ground. The output shaft of the second motor is connected to the end of the flipping shaft via a second belt. Multiple limiting holes are evenly distributed on the side of the flipping plate. A limiting sleeve is rotatably connected to the end of the support plate away from the lifting slide rod. Limiting rods that cooperate with the limiting holes are slidably connected to both sides of the limiting sleeve. A second support plate is provided on the side of the U-shaped support leg and is fixedly connected to the dynamic pressure cylinder and the downward pressure cylinder.

[0010] As a preferred embodiment of the present invention, the clamping assembly includes a clamping plate slidably connected to the flipping frame, a clamping head that cooperates with the pressure column is provided on the side of the clamping plate near the pressure column, and a clamping screw that is rotatably connected to the end of the flipping frame is threadedly connected to the clamping plate.

[0011] As a preferred embodiment of the present invention, the angle locking assembly includes a horizontal plate slidably connected to the underside of the two U-shaped legs. The middle portions of the two horizontal plates are respectively fixedly connected to both sides of a limiting beam. Limiting grooves that cooperate with the flip frame are provided on both sides of the limiting beam. A lifting bracket is provided in the middle of the U-shaped leg, a lifting screw is rotatably connected to the middle of the lifting bracket, a lifting block is threadedly connected to the middle of the lifting screw, and lifting rods fixedly connected to the limiting beam are provided on both sides of the lifting block. A drive shaft is rotatably connected to the side of the U-shaped leg, and a first bevel gear is provided at the end of the drive shaft. The first bevel gear meshes with a second bevel gear fixedly connected to the lifting screw.

[0012] The present invention has the following advantages:

[0013] 1. Improved simulation of working conditions: In bending tests, the stress characteristics of building structures under complex dynamic scenarios such as traffic vibration, equipment operation or natural disasters are realistically reproduced. Compared with the traditional static three-point bending test, the test results can better reflect the dynamic strength response of materials under actual service conditions, providing high-confidence data support for structural safety assessment.

[0014] 2. Improved testing efficiency and operability: The dynamic pressure component can drive the lower pressure head to perform high-speed lifting and lowering displacement during non-testing stages, significantly expanding the sample loading and unloading operation space. This function completely solves the problem of cumbersome and time-consuming rebar positioning caused by the fixed pressure head stroke in traditional equipment, and greatly improves the efficiency of continuous testing operations.

[0015] 3. System integration and scalability: The dual-component modular design maintains the compactness of the hydraulic system while giving the device multi-mode loading capabilities, including pure static, pure dynamic, and dynamic-static composite loading. Users can flexibly configure load parameters to adapt to the full-scenario testing needs, from standard quality acceptance to extreme working condition simulation, providing a forward-looking experimental platform for the study of building material performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of a building material strength testing device.

[0018] Figure 2 This is a front view of a building material strength testing device.

[0019] Figure 3 This is a schematic diagram of the structure of a building material strength testing device after the flip frame and the limiting groove are separated.

[0020] Figure 4 This is a schematic diagram of the extrusion mechanism in a building material strength testing device.

[0021] Figure 5 This is a schematic diagram of the internal structure of the downward pressing cylinder in a building material strength testing device.

[0022] Figure 6 This is a schematic diagram of the structure of a stable pressure application component in a building material strength testing device.

[0023] Figure 7 This is a schematic diagram of the dynamic pressure application component in a building material strength testing device.

[0024] Figure 8 This is a schematic diagram of the support mechanism in a building material strength testing device.

[0025] Figure 9 This is a schematic diagram of the structure of a flip frame in a building material strength testing device.

[0026] Figure 10 This is a schematic diagram of the angle locking component in a building material strength testing device.

[0027] Figure 11 for Figure 10 A magnified view of part A in the diagram.

[0028] In the diagram: 1. Support frame; 2. U-shaped support leg; 3. U-shaped support leg; 4. Extrusion mechanism; 5. Support mechanism; 6. Lifting platform; 7. Lower pressure head; 8. Lower pressure column; 9. Lower pressure cylinder; 10. Stabilizing pressure assembly; 11. Dynamic pressure assembly; 12. Lower pressure piston; 13. Stabilizing pressure cylinder; 14. Lifting screw; 15. First piston; 16. First motor; 17. First belt; 18. First support plate; 19. Second connecting pipe; 20. Dynamic pressure cylinder; 21. Second piston; 22. Lifting slide bar; 23. Second motor; 24. Second belt; 25. Support plate ; 26. Flipping shaft; 27. Flipping plate; 28. Limiting hole; 29. ​​Limiting rod; 30. Limiting sleeve; 31. First connecting pipe; 32. Second support plate; 33. Support frame; 34. Pressure-bearing column; 35. Flipping frame; 36. Clamping head; 37. Clamping plate; 38. Clamping screw; 39. Clamping assembly; 40. Angle locking assembly; 41. Horizontal plate; 42. Limiting groove; 43. Limiting crossbeam; 44. Lifting block; 45. Lifting rod; 46. Lifting screw; 47. Lifting bracket; 48. Drive shaft; 49. Second bevel gear; 50. First bevel gear; 51. Rebar to be tested. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In one embodiment, see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 A building material strength testing device includes a support frame 1, with U-shaped legs 2 at both ends and a U-shaped leg 3 in the middle. The support frame 1 has a U-shaped structure and is horizontally arranged. The lower ends of the U-shaped legs 2 and the U-shaped legs 3 are flat plates of equal height, thus supporting the entire testing device. It also includes a compression mechanism 4 and a support mechanism 5. Therefore, the U-shaped legs 2 and the U-shaped legs 3 can support the entire testing device and also fix subsequent components.

[0031] The extrusion mechanism 4 includes a pressing cylinder 9 mounted on the top of the U-shaped support leg 3. The pressing cylinder 9 is vertically positioned, with its upper end fixedly connected to the middle of the U-shaped support leg 3. A pressing piston 12 is slidably connected to the middle of the pressing cylinder 9. The lower surface of the pressing piston 12 is fixedly connected to the upper end of the pressing column 8. The middle of the pressing column 8 is slidably connected to the lower end of the pressing cylinder 9. The lower end of the pressing column 8 is fixedly connected to the middle of the upper surface of a lifting platform 6, which is oriented front to back. The front and rear ends of the lifting platform 6 slide against the front and rear sides of the U-shaped support leg 3. A pressure head 7 is provided in the middle of the lower surface. Different sizes of pressure heads 7 can be selected and fixed to the lifting platform 6 according to the actual testing requirements. A stabilizing pressure component 10 is provided on the front side of the U-shaped support leg 3. The stabilizing pressure component 10 can continuously and stably squeeze or squeeze hydraulic oil into the pressure cylinder 9. A dynamic pressure component 11 is provided on the rear side of the U-shaped support leg 3. The dynamic pressure component 11 can squeeze or squeeze hydraulic oil into the pressure cylinder 9 according to the fluctuating pressure, so that the pressure inside the pressure cylinder 9 can change dynamically.

[0032] The support mechanism 5 includes a pressure-bearing column 34 located at the upper end of the U-shaped support leg 2. The front and rear ends of the pressure-bearing column 34 are fixedly connected to the upper end of the U-shaped support leg 2. The front and rear sides of the pressure-bearing column 34 are rotatably connected to the front and rear vertical plates of the flip frame 35. A clamping component 39 is provided at the upper end of the flip frame 35. A steel bar 51 to be tested can be inserted between the clamping component 39 and the pressure-bearing column 34, so as to perform subsequent bending resistance testing on the steel bar 51. An angle locking component 40 is provided at the lower part of the U-shaped support leg 2. The angle locking component 40 can keep the flip frame 35 in a vertical state.

[0033] In one instance of this embodiment, please refer to Figure 5 and Figure 6The stabilizing pressure assembly 10 includes a stabilizing pressure cylinder 13 vertically disposed on the front side of the U-shaped support leg 3. A first piston 15 is slidably connected inside the stabilizing pressure cylinder 13. The upper cavity of the stabilizing pressure cylinder 13 and the upper cavity of the lower cylinder 9 are connected by a first connecting pipe 31. Hydraulic oil inside the upper cavity of the stabilizing pressure cylinder 13 can enter the upper cavity of the lower cylinder 9 through the first connecting pipe 31. The upper and lower ends of the stabilizing pressure cylinder 13 are rotatably connected to the upper and lower sides of the lifting screw 14, respectively. The middle part of the lifting screw 14 is threadedly connected to the middle part of the first piston 15. A first motor 16 is installed at the front. The output shaft of the first motor 16 and the upper end of the lifting screw 14 are both fixedly connected to pulleys. The two pulleys are connected by a first belt 17. Therefore, the first motor 16 drives the lifting screw 14 to rotate through the belt drive, thereby causing the first piston 15 to move up and down along the stabilizing pressure cylinder 13. In order to improve the stability of the stabilizing pressure cylinder 13, a first support plate 18 with a front-to-back orientation is installed at the middle of the front side of the U-shaped support leg 3. The middle part of the first support plate 18 is fixedly connected to the lower end of the stabilizing pressure cylinder 13, and the rear end of the first support plate 18 is fixedly connected to the front side of the pressing cylinder 9.

[0034] In one instance of this embodiment, please refer to Figure 5 and Figure 7The dynamic pressure application assembly 11 includes a dynamic pressure application cylinder 20 disposed on the rear side of the U-shaped support leg 3. The dynamic pressure application cylinder 20 is vertically arranged, and a second piston 21 is slidably connected to the middle of the dynamic pressure application cylinder 20. The upper cavity of the dynamic pressure application cylinder 20 is connected to the upper cavity of the lowering cylinder 9 through a second connecting pipe 19. A vertically arranged lifting slide rod 22 is fixedly connected to the middle of the upper surface of the second piston 21. The upper part of the lifting slide rod 22 is slidably connected to the upper end of the dynamic pressure application cylinder 20 and the upper part of the U-shaped support leg 3. On the front and rear sides above the lifting slide rod 22, there are joints that connect with the upper surface of the U-shaped support leg 3. A support frame 33 is fixedly connected to the surface. The upper end of the support frame 33 is rotatably connected to a flip shaft 26. The end of the flip shaft 26 near the center of the lifting slide rod 22 is fixedly connected to the end of a flip plate 27. Multiple limiting holes 28 are evenly distributed on the side of the flip plate 27 away from the flip shaft 26. The lower end of the support plate 25 is rotatably connected to the upper end of the lifting slide rod 22. The upper end of the support plate 25 is rotatably connected to the middle of a limiting sleeve 30. Limiting rods 29 that cooperate with the limiting holes 28 are slidably connected to the front and rear sides of the limiting sleeve 30. A buffer spring is provided between the two limiting rods 29, and the two buffer springs are located inside the limiting sleeve 30. By selecting a suitable limiting hole 28 to insert the limiting rod 29, that is, adjusting the rotation radius of the limiting sleeve 30, the lifting and lowering amplitude of the second piston 21 is adjusted, thereby adjusting the lifting and lowering amplitude of the lowering piston 12 inside the lowering cylinder 9, that is, adjusting the lifting and lowering amplitude of the lowering head 7. A second motor 23 is installed at the rear end of the upper surface of the U-shaped support leg 3. Both the output shaft of the second motor 23 and the rear end of the tilting shaft 26 are fixedly connected to pulleys. The two pulleys are connected by a second belt 24, allowing the second motor 23 to drive the tilting shaft 26 via belt transmission, thereby causing the tilting plate 27 to rotate. To ensure the stability of the dynamic pressure cylinder 20, a second support plate 32 is installed in the middle of the rear side of the U-shaped support leg 3. The lower end of the dynamic pressure cylinder 20 is fixedly connected to the middle of the second support plate 32, and the right side of the pressing cylinder 9 is fixedly connected to the front end of the second support plate 32. This second support plate 32 further stabilizes the dynamic pressure cylinder 20. The diameter of the first piston 15 is larger than that of the second piston 21 and the lowering piston 12, thereby achieving the effect of deceleration. On the one hand, the first piston 15 can provide a larger oil pressure to the lowering cylinder 9 with only a smaller power, thus achieving a larger downward force of the lowering head 7. On the other hand, the flow rate that the second piston 21 needs to provide is smaller. By using a smaller size second piston 21, the power requirement of the second motor 23 is also smaller.

[0035] In one instance of this embodiment, please refer to Figure 8 and Figure 9The clamping assembly 39 includes a clamping plate 37 arranged in a front-to-back orientation. The front and rear ends of the clamping plate 37 are slidably connected to the front and rear sides of the flip frame 35. The middle part of the clamping screw 38 is threadedly connected to the upper end of the flip frame 35. The lower end of the clamping screw 38 is rotatably connected to the upper surface of the clamping plate 37. A clamping head 36 that cooperates with the pressure column 34 is provided on the lower surface of the clamping plate 37. The up and down movement of the clamping head 36 is adjusted by the clamping screw 38. That is, the clamping head 36 and the pressure column 34 achieve the effect of limiting and fixing the steel bar 51 to be tested.

[0036] In one instance of this embodiment, please refer to Figure 8 , Figure 10 and Figure 11 The angle locking component 40 includes a horizontal plate 41 slidably connected to the lower part of the U-shaped support leg 2. The horizontal plate 41 is arranged in a front-back orientation. The upper surface of the two horizontal plates 41 on the left and right sides is fixedly connected to the left and right ends of the limiting beam 43 arranged in a left-right orientation. U-shaped limiting grooves 42 are provided on the left and right sides of the upper surface of the limiting beam 43. Therefore, when the limiting groove 42 moves upward, the limiting groove 42 can be locked at the lower end of the flip frame 35, thereby restricting the flip frame 35 from rotating around the pressure column 34. A lifting bracket 47 is installed at the lower middle of the U-shaped support leg 3. The lifting bracket 47 is a U-shaped structure with the opening facing downwards. The upper middle of the lifting bracket 47 is rotatably connected to the upper end of the vertically installed lifting screw 46. The lower end of the lifting screw 46 is rotatably connected to the lower middle of the U-shaped support leg 3. The middle of the lifting screw 46 is threaded with a lifting block 44 arranged in a left-right orientation. The left and right ends of the lifting block 44 are fixedly connected to the lower end of the vertically installed lifting rod 45. The upper end of the lifting rod 45 is fixedly connected to the lower surface of the limiting beam 43. A drive shaft 48, which is rotatably connected to the front side of the U-shaped support leg 3 and is arranged in a front-rear orientation, is provided at the rear end of the drive shaft 48. The first bevel gear 50 is meshed with the second bevel gear 49. The second bevel gear 49 is fixedly connected to the lower end of the lifting screw 46. Therefore, the drive shaft 48 can make the lifting screw 14 rotate through gear transmission. The lifting screw 14 pushes the limiting beam 43 up and down through the lifting block 44 and the lifting rod 45, thereby adjusting the relative angle between the limiting groove 42 and the flip frame 35.

[0037] In this embodiment, a suitable pressure head 7 is selected and installed below the lifting platform 6 according to the size of the steel bar 51 to be tested. The first motor 16 and the second motor 23 are powered. A pressure sensor is set between the lifting platform 6 and the pressure column 8, and a displacement sensor is set between the lifting platform 6 and the U-shaped support leg 3 to facilitate subsequent equipment control. The speed of the first motor 16 and the second motor 23 can be precisely controlled by computer, thereby accurately controlling subsequent load changes. At the same time, a deformation strain gauge is installed on the outside of the steel bar 51 to be tested, so as to obtain the deformation changes of the steel bar 51 to be tested in a timely manner.

[0038] For stable pressure bending test, rotate drive shaft 48, limit groove 42 moves upward to lock the lower end of flip frame 35, insert limit rod 29 into the farthest limit hole 28, start second motor 23, second motor 23 drives flip plate 27 to rotate, flip plate 27 drives second piston 21 to descend rapidly, at this time the unloaded pressing piston 12 rises rapidly, thereby causing pressing head 7 to rise rapidly, passing the steel bar to be tested 51 from left to right between bearing column 34 and clamping head 36, rotate clamping screw 38, pressing head 7 and bearing column 34 complete the limit of steel bar to be tested 51. In the position processing, the second motor 23 is restarted, the second piston 21 rises rapidly, and the pressure head 7 descends rapidly, causing the pressure head 7 to quickly fall above the steel bar 51 to be tested. The second motor 23 is then stopped, and the first motor 16 is started. The first motor 16, through the lifting screw 14, causes the first piston 15 to rise slowly. At this time, the hydraulic oil inside the stabilizing pressure assembly 10 slowly enters the pressure cylinder 9, causing the pressure head 7 to move steadily downwards, thus pressing the steel bar 51 to be tested, achieving stable pressure bending detection. If greater downward pressure is required during the testing process, the flip plate 27 can be rotated to a vertical position, with the limit rod 29 in a high position. The angle of the flip plate 27 is locked, and the force on the second piston 21 is directly transmitted to the U-shaped support leg 3 through the support frame 33. The second motor 23 does not need to provide driving force; only the first motor 16 needs to provide pressure, increasing the maximum pressure supply of the entire testing device. After the test is completed, the first motor 16 is stopped, and the limiting rod 29 is inserted into the limiting hole 28 at the far end. At this time, the second motor 23 can quickly push the second piston 21 to move downward, which causes the pressing piston 12 to move upward quickly, and the pressing head 7 to rise quickly, so that the steel bar 51 to be tested can be unloaded.

[0039] For dynamic pressure bending test, repeat the above steps to install the steel bar 51 to be tested and let the pressure head 7 fall on the steel bar 51 to be tested. At this time, select the appropriate limiting hole 28 to insert the limiting rod 29, and start the first motor 16. The first motor 16 causes the hydraulic oil inside the stable pressure cylinder 13 to flow into the pressure cylinder 9. At this time, the pressure piston 12 moves downward steadily. At the same time, start the second motor 23. The second motor 23, through the cooperation of the flip plate 27 and the support plate 25, causes the second piston 21 to move up and down repeatedly. The hydraulic oil inside the dynamic pressure cylinder 20 flows in and out of the pressure cylinder 9 quickly, causing the oil pressure inside the pressure cylinder 9 to fluctuate. At this time, due to the difference between the lifting screw 14 and the first piston 15... It uses a screw and nut transmission method, so the pressure change of the oil pressure is directly transmitted to the stabilizing pressure cylinder 13 through the lifting screw 14. It will not have a greater impact on the stable operation of the first motor 16. The load will change, but there will be no problem of reverse force direction, thus ensuring the service life of the first motor 16. At this time, the lower pressure head 7 can apply dynamic downward pressure to the steel bar 51 to be tested. Even when the flow rate of the hydraulic oil provided by the second piston 21 decreases more than the flow rate of the hydraulic oil provided by the first piston 15 increases, the lower pressure head 7 will produce an up-and-down vibration effect, further simulating the stress situation of the steel bar 51 under actual use. At this time, the dynamic pressure detection of the steel bar 51 to be tested is completed.

[0040] When the bending deformation of the reinforcing bar 51 to be tested is large, the drive shaft 48 can be rotated in the opposite direction, and the limiting groove 42 moves downward and disengages from the flipping frame 35. At this time, when the reinforcing bar 51 to be tested bends, the flipping frame 35 will rotate adaptively, so that the deformation of the reinforcing bar 51 to be tested becomes consistent with the deformation when the middle single point is compressed. The deformation strain gauge can better detect the deformation at different positions of the reinforcing bar 51 to be tested.

[0041] This invention provides a building material strength testing device. By innovatively integrating a dual-mode collaborative control system of a stable pressure application component 10 and a dynamic pressure application component 11, it achieves composite and precise adjustment of the hydraulic pressure of the lower pressure cylinder 9, enabling the lower pressure head 7 to simultaneously apply two fundamentally different types of loads, simulating the long-term static service state of the structure and the transient mechanical environment such as vibration and impact in actual working conditions. During non-testing stages, the dynamic pressure application component 11 can drive the lower pressure head 7 to perform high-speed lifting and lowering displacement, significantly expanding the sample loading and unloading operation space.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A building material strength testing device, comprising a support frame, U-shaped legs at both ends of the support frame, and a U-shaped leg in the middle of the support frame, characterized in that, It also includes the extrusion mechanism and the support mechanism; The extrusion mechanism includes a pressing cylinder disposed on the side of the U-shaped support leg away from the ground. A pressing piston is slidably connected to the middle of the pressing cylinder. A pressing column is disposed in the middle of the pressing piston and slidably connected to the pressing cylinder. A lifting platform is disposed at the end of the pressing column near the ground and slidably connected to the U-shaped support leg. A pressing head is disposed in the middle of the lifting platform. Dynamic pressure application components and stable pressure application components for adjusting the internal pressure of the pressing cylinder are disposed on both sides of the U-shaped support leg. The support mechanism includes a pressure-bearing column located at the end of the U-shaped support leg away from the ground. The two sides of the pressure-bearing column are rotatably connected to the sides of the flip frame. A clamping assembly is provided at the end of the flip frame away from the ground. The steel bar to be tested is placed between the clamping assembly and the pressure-bearing column. An angle locking assembly that restricts the rotation of the flip frame is provided on the side of the U-shaped support leg close to the ground. The dynamic pressure application assembly includes a dynamic pressure application cylinder fixedly connected to a U-shaped support leg. A second piston is slidably connected inside the dynamic pressure application cylinder. A support frame is provided on the side of the U-shaped support leg away from the ground. A flipping shaft is rotatably connected to the support frame. A flipping plate is fixedly connected to the flipping shaft. A support plate is rotatably connected to the side of the flipping plate away from the flipping shaft. A lifting slide rod fixedly connected to the second piston is rotatably connected to the end of the support plate away from the flipping plate. The side of the dynamic pressure application cylinder away from the ground is connected to the side of the pressing cylinder away from the ground through a second connecting pipe. A second motor is provided on the side of the U-shaped support leg away from the ground. The output shaft of the second motor is connected to the end of the flipping shaft through a second belt. Multiple limiting holes are evenly distributed on the side of the flipping plate. A limiting sleeve is rotatably connected to the end of the support plate away from the lifting slide rod. Limiting rods that cooperate with the limiting holes are slidably connected to both sides of the limiting sleeve. A second support plate is provided on the side of the U-shaped support leg and fixedly connected to the dynamic pressure application cylinder and the pressing cylinder.

2. The building material strength testing device according to claim 1, characterized in that, The stabilizing pressure assembly includes a stabilizing pressure cylinder fixedly connected to the U-shaped support leg. A first piston is slidably connected inside the stabilizing pressure cylinder, and lifting screws that are threadedly connected to the first piston are rotatably connected to both ends of the stabilizing pressure cylinder.

3. The building material strength testing device according to claim 2, characterized in that, The end of the stabilizing pressure cylinder near the ground is provided with a first support plate that is fixedly connected to the U-shaped support leg and the downward pressure cylinder. The side of the U-shaped support leg is provided with a first motor, and the output shaft of the first motor is connected to the end of the lifting screw through a first belt.

4. The building material strength testing device according to claim 2, characterized in that, The diameter of the first piston is larger than that of the second piston and the lowering piston. The side of the stabilizing pressure cylinder away from the ground is connected to the side of the lowering cylinder away from the ground through the first connecting pipe.

5. The building material strength testing device according to claim 1, characterized in that, The clamping assembly includes a clamping plate that is slidably connected to the flip frame. The clamping plate has a clamping head that cooperates with the pressure column on the side near the pressure column. The end of the flip frame is threadedly connected to a clamping screw that is rotatably connected to the clamping plate.

6. The building material strength testing device according to claim 1, characterized in that, The angle locking assembly includes a horizontal plate slidably connected to the two U-shaped legs below. The middle parts of the two horizontal plates are respectively fixedly connected to the two sides of the limiting beam. The two sides of the limiting beam are provided with limiting grooves that cooperate with the flip frame.

7. The building material strength testing device according to claim 6, characterized in that, The U-shaped support leg is provided with a lifting bracket in the middle, and a lifting screw is rotatably connected to the middle of the lifting bracket. A lifting block is threadedly connected to the middle of the lifting screw. Lifting rods are fixedly connected to limit beams on both sides of the lifting block. A drive shaft is rotatably connected to the side of the U-shaped support leg. A first bevel gear is provided at the end of the drive shaft. The first bevel gear is meshed with a second bevel gear fixedly connected to the lifting screw.

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