Concrete tensile test loading device for a compression testing machine

Abstract

The utility model discloses a concrete tensile test loading device suitable for pressure testing machine, including base, first tensile subassembly, second tensile subassembly, loading component and detection component, be provided with fixed plate and moving plate on the base, moving plate is suitable for moving along the first direction and is close to or away from fixed plate to adjust the interval of fixed plate and moving plate, first tensile subassembly sets up in fixed plate, second tensile subassembly sets up in moving plate, and first tensile subassembly, second tensile subassembly are connected with the both sides of concrete test piece respectively, loading component connects the loading part and moving plate of pressure testing machine, and is suitable for converting the pressure of second direction into the tension of first direction to carry out tensile test to concrete test piece, and detection component sets up in first tensile subassembly and / or second tensile subassembly to be suitable for gathering test parameter, this application can realize pressure-tension conversion to utilize existing pressure testing machine to complete the tensile performance test of concrete, and the applicability is high.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering material performance testing technology, and in particular to a concrete tensile testing loading device suitable for a pressure testing machine. Background Technology

[0002] Concrete is a crucial structural material in civil engineering, but the natural microcracks at the interface between its aggregates and cement paste cause its tensile strength to be far lower than its compressive strength, typically only 8% to 15% of its compressive strength. This mechanical weakness has significant implications in practical engineering: many common structural members, such as beams subjected to bending or slabs prone to warping, are actually in a state of combined compressive and tensile stress. Accurate tensile property data are essential for establishing multiaxial strength criteria, revising material constitutive models, controlling early temperature shrinkage cracks during construction, and determining the timing of prestressing application.

[0003] Currently, splitting tensile testing is commonly used in engineering to assess the tensile strength of concrete. However, this method has significant limitations: it can only measure the single parameter of tensile strength and cannot obtain key deformation parameters such as stress-strain curves and elastic modulus; furthermore, its internal non-uniform stress distribution may introduce errors. While the theoretically more accurate direct tensile test can obtain comprehensive data, it faces two major obstacles: first, the test requires a dedicated tensile testing machine or a high-precision universal testing machine, which many field laboratories or testing units lack; second, existing direct tensile testing methods are numerous and lack unified standards, often requiring customized fixtures and molds based on the specimen shape and size, significantly increasing the cost and complexity of the test. Utility Model Content

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a concrete tensile testing loading device suitable for a compression testing machine, aiming to solve the problem of poor applicability of existing tensile testing devices.

[0005] This application discloses a loading device for concrete tensile testing suitable for a compression testing machine, comprising a base, a first tensile component, a second tensile component, a loading component, and a detection component. A fixed plate and a movable plate are disposed on the base. The movable plate is adapted to move closer to or further away from the fixed plate along a first direction to adjust the distance between the fixed plate and the movable plate. The first tensile component is disposed on the fixed plate, and the second tensile component is disposed on the movable plate. The first and second tensile components are respectively connected to both sides of the concrete specimen to load the concrete specimen between the fixed plate and the movable plate. The loading component includes a loading plate and a load conversion mechanism. The loading plate is adapted to connect to the loading part of the compression testing machine, and the load conversion mechanism is connected to the movable plate. The loading part of the compression testing machine is adapted to apply a pressure load in a second direction to the loading plate. The loading plate is connected to the load conversion mechanism to transfer the pressure load to the load conversion mechanism. A fluid medium cavity is formed within the load conversion mechanism to convert the fluid pressure in the second direction into fluid pressure in the first direction, and to push the movable plate to move along the first direction to apply a tensile load to the concrete specimen. The detection component is disposed on the first tensile component and / or the second tensile component to collect test parameters.

[0006] The concrete tensile testing loading device of this application, due to the inclusion of a loading component capable of converting the force transmission direction, enables compression-tension conversion, thereby allowing the tensile properties testing of concrete to be performed using existing compression testing machines. This application eliminates the reliance on dedicated tensile testing equipment, enabling more widely used compression testing machines to perform direct tensile testing, significantly reducing the demand for testing equipment. Furthermore, the structure of this application is simple, detachable, and adjustable, making it suitable for concrete specimens of different specifications and shapes; it is also easy to assemble with compression testing machines, making it compatible with various types and specifications of compression testing machines; thus, the concrete tensile testing loading device of this application has excellent applicability.

[0007] According to some embodiments of this application, the fluid medium cavity includes a first medium cavity extending along a first direction and a second medium cavity extending along a second direction, and the fluid medium cavity is filled with hydraulic medium; the load conversion mechanism includes a first hydraulic rod and a second hydraulic rod, the first hydraulic rod is connected to a loading plate and communicates with the second medium cavity; the first hydraulic rod is adapted to reduce the volume of the second medium cavity under the pressure of the loading plate; the medium in the second medium cavity flows to the first medium cavity under pressure to adapt to the increase in the volume of the first medium cavity; the second hydraulic rod communicates with the first medium cavity and is connected to a moving plate; when the volume of the first medium cavity increases, it pushes the second hydraulic rod to move, so as to drive the moving plate to move along the first direction.

[0008] According to some embodiments of this application, the load switching mechanism includes a first hydraulic cylinder and a second hydraulic cylinder, the first hydraulic rod extending along a second direction and the second hydraulic rod extending along a first direction; the first hydraulic cylinder includes a first hydraulic rod and the second hydraulic cylinder includes a second hydraulic rod, and the rodless chamber of the first hydraulic cylinder is connected to the rodless chamber of the second hydraulic cylinder to form a fluid medium chamber.

[0009] According to some embodiments of this application, both the first hydraulic cylinder and the second hydraulic cylinder are constructed in multiples and connected in a one-to-one correspondence. The multiple first hydraulic cylinders are constructed in the same way and arranged in parallel, and the multiple second hydraulic cylinders are constructed in the same way and arranged in parallel.

[0010] According to some embodiments of this application, the detection component includes a load sensor, a laser rangefinder, and a laser reflector. The load sensor is disposed on the first tension component to be suitable for real-time acquisition of tensile load data borne by the concrete specimen during the test. The laser rangefinder is disposed on the second tension component and is suitable for moving with the moving plate. The laser reflector is fixedly disposed on the base and located on the side of the moving plate away from the fixed plate. The moving plate moves closer to or away from the laser reflector when it moves. The laser rangefinder acquires the distance data between itself and the laser reflector in real time.

[0011] According to some embodiments of this application, the first tension assembly includes a first connecting rod and a first connecting member. The first connecting rod is connected to a fixed plate, and the first connecting member is adapted to connect a concrete specimen. A load sensor is connected between the first connecting rod and the first connecting member and is detachably connected to the first connecting member. The second tension assembly includes a second connecting rod and a second connecting member. The second connecting rod is connected to a movable plate. One end of the second connecting member is connected to one end of the second connecting rod, and the other end of the second connecting member is adapted to connect a concrete specimen. A laser rangefinder is disposed at the other end of the second connecting rod and faces the laser reflector.

[0012] According to some embodiments of this application, a first connecting groove is formed on the fixed plate extending in a second direction, a first connecting rod passes through the first connecting groove and is adapted to move along the first connecting groove to adjust the position of the first connecting member; a second connecting groove is formed on the movable plate extending in a second direction, a second connecting rod passes through the second connecting groove and is adapted to move along the second connecting groove to adjust the position of the second connecting member; the center line connecting the first connecting member and the second connecting member is parallel to the first direction.

[0013] According to some embodiments of this application, the concrete tensile test loading device further includes a first top plate and a second top plate, the first top plate being connected to a fixed plate; the second top plate being connected to a movable plate; wherein the first top plate and the second top plate extend along a first direction; the housing of the first hydraulic cylinder and / or the second hydraulic cylinder is connected to the first top plate, and the second hydraulic rod is connected to the second top plate.

[0014] According to some embodiments of this application, the concrete tensile test loading device further includes a telescopic rod, one end of which is connected to a base, and the other end of which is connected to a laser reflector, so as to adjust the relative position of the laser reflector and the fixed plate.

[0015] According to some embodiments of this application, a concrete tensile test loading device is adapted to be assembled in the test space of a compression testing machine; wherein, a first tensile component is adapted to be connected to one side wall of the compression testing machine, and a laser reflector is adapted to be connected to the opposite side wall of the compression testing machine, so as to define the relative position of the concrete tensile test loading device in the compression testing machine.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural schematic diagram of a concrete tensile testing loading device according to some embodiments of this application; Figure 2 This is a front view of the structure of a concrete tensile testing loading device according to some embodiments of this application; Figure 3 This is a top view of the concrete tensile testing loading device according to some embodiments of this application; Figure 4 This is an assembly diagram of a first tension component and a load sensor according to some embodiments of this application; Figure 5 This is an assembly diagram of the second tensioning component and the laser rangefinder sensor according to some embodiments of this application.

[0018] Figure label: Base 10; Slide 11; Fixed plate 21; First connecting groove 211; First connecting rod (first threaded rod) 22; First threaded sleeve 23; First connecting component 24; First limiting nut 25; Movable plate 31; Second connecting groove 311; Second connecting rod (second threaded rod) 32; Second threaded sleeve 33; Second connecting component 34; Second limiting nut 35; First top plate 41; Second top plate 42; Loading plate 43; First hydraulic cylinder 44; Second hydraulic cylinder 45; Load sensor 51; laser rangefinder 52; laser reflector 53; telescopic pole 54. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] The following is for reference. Figures 1-5 This invention describes a concrete tensile testing loading device suitable for a pressure testing machine, according to an embodiment of the present invention.

[0021] This application discloses a loading device for concrete tensile testing suitable for a compression testing machine, comprising a base 10, a first tensile component, a second tensile component, a loading component, and a testing component; a fixed plate 21 and a movable plate 31 are disposed on the base 10; the movable plate 31 is adapted to move closer to or further away from the fixed plate 21 along a first direction to adjust the distance between the fixed plate 21 and the movable plate 31; the first tensile component is disposed on the fixed plate 21, and the second tensile component is disposed on the movable plate 31, the first tensile component and the second tensile component being respectively connected to both sides of the concrete specimen to load the concrete specimen between the fixed plate 21 and the movable plate 31; the loading component includes a loading... The loading plate 43 and the load conversion mechanism are configured such that the loading plate 43 is adapted to connect to the loading part of the pressure testing machine, and the load conversion mechanism is connected to the moving plate 31; wherein the loading part of the pressure testing machine is adapted to apply a pressure load in a second direction to the loading plate 43; the loading plate 43 is connected to the load conversion mechanism to transfer the pressure load to the load conversion mechanism; a fluid medium cavity is formed in the load conversion mechanism to convert the fluid pressure in the second direction into the fluid pressure in the first direction, and to push the moving plate 31 to move along the first direction to apply a tensile load to the concrete specimen; a detection component is disposed in the first tensile component and / or the second tensile component to collect test parameters.

[0022] According to the concrete tensile test loading device of this application, the concrete specimen is loaded by setting a first tensile component and a second tensile component; the base 10, the fixed plate 21, and the moving plate 31 provide the mounting foundation for the first tensile component and the second tensile component; when the moving plate 31 moves away from the fixed plate 21, the first tensile component and the second tensile component apply tensile force to the concrete specimen. The concrete tensile test loading device of this application is suitable for a compression testing machine, wherein the loading plate 43 of the loading component is connected to the loading part of the compression testing machine, bears the pressure load output by the compression testing machine in a second direction, and transmits the pressure in the same direction to the load conversion mechanism. The load conversion mechanism uses a fluid medium to change the direction of pressure transmission, converting the pressure in the second direction into pressure in the first direction, and transmitting it to the moving plate 31 to push the moving plate 31 to move away from the fixed plate 21, thereby applying tensile force to the concrete specimen. During the tensile test of the concrete specimen, the detection component monitors and collects test parameters in real time for analysis of the tensile properties of the concrete specimen.

[0023] The concrete tensile testing loading device of this application, due to the inclusion of a loading component capable of converting the force transmission direction, enables compression-tension conversion, thereby allowing the tensile properties of concrete to be tested using existing compression testing machines. This application eliminates the reliance on dedicated tensile testing equipment, enabling more widely used compression testing machines to perform direct tensile testing, expanding the application range of existing compression testing machines, significantly reducing testing equipment requirements, and overcoming the limitations of existing testing methods. Furthermore, the structure of this application is simple, detachable, and adjustable, making it suitable for concrete specimens of different specifications and shapes; it is also easy to assemble with compression testing machines, making it applicable to compression testing machines of different shapes and sizes; the concrete tensile testing loading device of this application has excellent applicability.

[0024] In some embodiments, such as Figure 1 As shown, a sliding groove 11 extending along a first direction is formed on the base 10. The bottom of the movable plate 31 is slidably connected with the sliding groove 11. The sliding groove 11 can guide and limit the movement, improving the stability of the movable plate 31. Furthermore, during initial assembly, the distance between the end of the base 10 and the movable plate 31 is greater than 10cm to ensure sufficient movement space and prevent the movable plate 31 from dislodging from the sliding groove 11 during the tensile test.

[0025] According to some embodiments of this application, the fluid medium cavity includes a first medium cavity extending along a first direction and a second medium cavity extending along a second direction, and the fluid medium cavity is filled with hydraulic medium; the load conversion mechanism includes a first hydraulic rod and a second hydraulic rod, the first hydraulic rod is connected to the loading plate 43 and communicates with the second medium cavity; the first hydraulic rod is adapted to reduce the volume of the second medium cavity under the pressure of the loading plate 43; the medium in the second medium cavity flows to the first medium cavity under pressure to adapt to the increase in the volume of the first medium cavity; the second hydraulic rod communicates with the first medium cavity and is connected to the moving plate 31; when the volume of the first medium cavity increases, it pushes the second hydraulic rod to move, so as to drive the moving plate 31 to move along the first direction.

[0026] In this embodiment, the first medium cavity extends along a first direction, and the second medium cavity extends along a second direction, and the two are connected and combined to form an integral fluid medium cavity. The fluid medium cavity is filled with hydraulic medium. Under the pressure of the loading plate 43 and the first hydraulic rod, the hydraulic medium in the second medium cavity flows into the first medium cavity, pushing the second hydraulic rod and the moving plate 31 to move, thereby realizing the conversion of the pressure output in the second direction of the pressure testing machine into the tensile force applied to the concrete test specimen in the first direction. This embodiment utilizes the two extending directions of the fluid medium cavity and controls the linkage of the first hydraulic rod and the second hydraulic rod through a hydraulic circuit to ensure that the movement of the second hydraulic rod follows the movement of the first hydraulic rod, realizing the pressure-to-tensile force conversion. The structure is simple, the control is efficient, and the control accuracy is high.

[0027] Furthermore, the stroke of the second hydraulic rod is greater than the initial distance between the moving plate 31 and the right end of the base 10 to ensure sufficient tensile displacement; in some embodiments, the maximum stroke of the second hydraulic rod is 20 cm.

[0028] Furthermore, in some embodiments, the loading plate 43, the first hydraulic rod, the second hydraulic rod, the moving plate 31, the fixed plate 21, and the first and second tension components all adopt rigid structures. Combining the hydraulic characteristics of the hydraulic medium and the mechanical characteristics of each component, there is a definite relationship between the pressure output by the pressure testing machine and the tensile force applied to the concrete specimen by the first and second tension components. Therefore, by using the pressure sensor built into the pressure testing machine and the detection components of this application, dual detection and verification can be achieved, reducing test errors.

[0029] According to some embodiments of this application, the load transfer mechanism includes a first hydraulic cylinder 44 and a second hydraulic cylinder 45. A first hydraulic rod extends along a second direction, and a second hydraulic rod extends along a first direction. The first hydraulic cylinder 44 includes a first hydraulic rod, and the second hydraulic cylinder 45 includes a second hydraulic rod. The rodless chamber of the first hydraulic cylinder 44 communicates with the rodless chamber of the second hydraulic cylinder 45 to form a fluid medium chamber. In this embodiment, the fluid medium chamber is established using two hydraulic cylinders. Existing hydraulic cylinder structures can be applied, the technology is mature, readily available, and easy to manufacture. This achieves excellent hydraulic transmission performance, ensuring the stability and reliability of load transfer and transfer, and reducing load errors.

[0030] According to some embodiments of this application, multiple first hydraulic cylinders 44 and multiple second hydraulic cylinders 45 are constructed and connected in a one-to-one correspondence. The multiple first hydraulic cylinders 44 are identical in construction and arranged in parallel, and the multiple second hydraulic cylinders 45 are identical in construction and arranged in parallel. In this embodiment, as... Figure 1 , 3 As shown, by setting multiple first hydraulic cylinders 44 and multiple second hydraulic cylinders 45, the stability of load transmission and conversion can be further improved; at the same time, the load bearing range can be expanded to realize tensile testing of concrete with larger tensile forces and meet the test requirements.

[0031] like Figure 1-5 As shown, according to some embodiments of this application, the detection assembly includes a load sensor 51, a laser rangefinder 52, and a laser reflector 53. The load sensor 51 is disposed on the first tension assembly to be suitable for real-time acquisition of tensile load data borne by the concrete specimen during the test. The laser rangefinder 52 is disposed on the second tension assembly and is suitable for moving with the moving plate 31. The laser reflector 53 is fixedly disposed on the base 10 and located on the side of the moving plate 31 away from the fixed plate 21. When the moving plate 31 moves, it moves closer to or further away from the laser reflector 53. The laser rangefinder 52 acquires the distance data between itself and the laser reflector 53 in real time. In this embodiment, the laser rangefinder 52 emits a detection laser, which is transmitted to the laser reflector 53 and then reflected back to the laser rangefinder 52, thereby realizing the distance detection between the two. This embodiment directly detects the tensile force change of the concrete specimen throughout the entire tensile process by setting a load sensor 51; and detects the change in the distance between the laser rangefinder 52 and the laser reflector 53 during the entire tensile process by using a laser rangefinder 52, thereby obtaining the displacement change of the moving plate 31, and then calculating the corresponding deformation value of the concrete specimen; the tensile properties of the concrete specimen can be analyzed based on the changes in tensile force and deformation. The laser rangefinder 52 of this application can directly capture the actual deformation of the concrete specimen, avoiding the installation error of traditional extensometers and improving the accuracy and reliability of the detection.

[0032] Furthermore, the measurement range and accuracy of the load sensor 51 are no less than those of the pressure sensor built into the pressure testing machine, and it is capable of performing data verification of tensile loads.

[0033] Furthermore, the laser rangefinder 52 has an accuracy of 0.01 mm; the center of the laser rangefinder 52 is directly opposite the center of the laser reflector 53, ensuring that the laser rangefinder 52 can accurately receive the reflected laser beam.

[0034] According to some embodiments of this application, the first tensile assembly includes a first connecting rod 22 and a first connecting member 24. The first connecting rod 22 is connected to a fixed plate 21, and the first connecting member 24 is adapted to connect a concrete specimen. A load sensor 51 is connected between the first connecting rod 22 and the first connecting member 24 and is detachably connected to the first connecting member 24. The second tensile assembly includes a second connecting rod 32 and a second connecting member 34. The second connecting rod 32 is connected to a movable plate 31, one end of the second connecting member 34 is connected to one end of the second connecting rod 32, and the other end of the second connecting member 34 is adapted to connect a concrete specimen. A laser rangefinder 52 is disposed at the other end of the second connecting rod 32 and faces the laser reflector 53. In this embodiment, the concrete specimen is assembled on the fixed plate 21 by the first connecting rod 22 and the second connecting member 34, and the concrete specimen is assembled on the movable plate 31 by the second connecting rod 32 and the second connecting member 34. The first connecting member 24 and the second connecting member 34 are detachable so that different connecting members can be selected according to the different shapes, structures, and sizes of the concrete specimens. Furthermore, such as Figure 2 , 4 As shown, the load sensor 51 is positioned between the first connecting rod 22 and the first connecting member 24, located on the tensile force transmission path, and can directly and accurately detect the tensile condition of the concrete specimen. Figure 2 , 5 As shown, the laser rangefinder 52 is positioned at the end of the second connecting rod 32 away from the concrete specimen, which can avoid structural interference with the laser transmission path and achieve accurate measurement of spacing / displacement.

[0035] In some embodiments, the connecting members (i.e., the first connecting member 24 and the second connecting member 34) can be connected to the concrete specimen by means of bonding, embedding, etc., to accommodate concrete specimens with different end structures such as steel-bonded, reinforced, and dumbbell-shaped. The assembly can be selected according to the concrete specimen during testing. In some embodiments, the connecting member is constructed as a tie plate, with one side of the tie plate connected to the concrete specimen by bonding, and the other side forming a threaded rod suitable for mating with the connecting sleeves (i.e., the first connecting sleeve 23 and the second connecting sleeve 33).

[0036] According to some embodiments of this application, a first connecting groove 211 extending along a second direction is formed on the fixed plate 21, and a first connecting rod 22 passes through the first connecting groove 211 and is adapted to move along the first connecting groove 211 to adjust the position of the first connecting member 24; a second connecting groove 311 extending along a second direction is formed on the movable plate 31, and a second connecting rod 32 passes through the second connecting groove 311 and is adapted to move along the second connecting groove 311 to adjust the position of the second connecting member 34; the center line connecting the first connecting member 24 and the second connecting member 34 is parallel to the first direction. In this embodiment, as... Figure 4 , 5 As shown, by setting the first connecting groove 211 and the second connecting groove 311, the positions of the first tensile component and the second tensile component in the second direction can be adjusted to accommodate concrete specimens of different specifications and shapes. Furthermore, during the test, assembling the first connecting component 24 and the second connecting component 34 with their centers aligned along the first direction, and ensuring that the line connecting their centers is parallel to the first direction, ensures that the concrete specimen is under tension along the first direction, reducing or avoiding forces in other directions, thereby improving the stability and reliability of the test.

[0037] Furthermore, the relative positions of the first connecting rod 22 and the first connecting groove 211 in the first and second directions can be adjusted; the relative positions of the second connecting rod 32 and the second connecting groove 311 in the first and second directions can also be adjusted, which can further improve the adaptability to concrete specimens, ensure that the concrete specimens are installed in the middle position of the device during the test, and ensure the overall stability of the device under stress in the pressure testing machine.

[0038] In some embodiments, the first connecting rod 22 is configured as a first threaded rod 22, and the first tensioning assembly further includes a first threaded sleeve 23. The first threaded rod 22 passes through the first connecting groove 211 and is adjusted to a position in the first direction. Both sides are locked by first limiting nuts 25 to achieve a fixed assembly with the fixing plate 21. The first threaded sleeve 23 is connected between the load sensor 51 and the first connecting member 24, and can be adapted to the structure of the load sensor 51 and the first connecting member 24, playing a role in connection and force transmission. The second connecting rod 32 is configured as a second threaded rod 32, and the second tensioning assembly further includes a second threaded sleeve 33. The second threaded rod 32 passes through the second connecting groove 311 and is adjusted to a position in the first direction. Both sides are locked by second limiting nuts 35 to achieve a fixed assembly with the fixing plate 21. The second threaded sleeve 33 is connected between the second threaded rod 32 and the second connecting member 34, and can be adapted to the structure of the first threaded rod 22 and the second connecting member 34, playing a role in connection and force transmission.

[0039] According to some embodiments of this application, the concrete tensile test loading device further includes a first top plate 41 and a second top plate 42. The first top plate 41 is connected to the fixed plate 21; the second top plate 42 is connected to the movable plate 31; wherein the first top plate 41 and the second top plate 42 extend along a first direction; the housing of the first hydraulic cylinder 44 and / or the second hydraulic cylinder 45 is connected to the first top plate 41, and the second hydraulic rod is connected to the second top plate 42. In this embodiment, the first top plate 41 and the second top plate 42 provide an installation base for the loading assembly, and the second top plate 42, in conjunction with the load conversion mechanism, plays a role in force transmission. Specifically, the loading plate 43 transmits pressure to the second hydraulic rod through the first hydraulic rod, the second hydraulic rod transmits pressure to the second top plate 42, and the second top plate 42 pushes the movable plate 31 to move.

[0040] In some embodiments, the base 10, the fixed plate 21 and the first top plate 41 are welded together in sequence, and the top of the movable plate 31 is welded together with the second top plate 42, so that the device has high rigidity and high stability.

[0041] According to some embodiments of this application, the concrete tensile testing loading device further includes a telescopic rod 54, one end of which is connected to the base 10, and the other end of which is connected to a laser reflector 53, to facilitate adjustment of the relative position of the laser reflector 53 and the fixed plate 21. In this embodiment, as... Figure 5 As shown, the position of the laser reflector 53 can be adjusted by setting the telescopic rod 54 to meet the laser ranging requirements and adapt to the experimental space of the pressure testing machine.

[0042] In some embodiments, the fixed end of the telescopic rod 54 is welded to the base 10, and the free end is connected to the laser reflector 53.

[0043] According to some embodiments of this application, a concrete tensile testing loading device is adapted to be assembled in the test space of a compression testing machine; wherein, a first tensile component is adapted to be connected to one side wall of the compression testing machine, and a laser reflector 53 is adapted to be connected to the opposite side wall of the compression testing machine, so as to define the relative position of the concrete tensile testing loading device in the compression testing machine. In this embodiment, the first tensile component is adapted to be connected to one side wall of the compression testing machine, and the laser reflector 53 is adapted to be connected to the opposite side wall of the compression testing machine, which can stably assemble the concrete tensile testing loading device of this application in the compression testing machine, ensuring the overall stability of the device during the test.

[0044] In some embodiments, a connecting hole is provided on one side wall of the pressure testing machine, through which the first connecting rod 22 passes and is fitted with a limiting member to achieve a fixed connection with the side wall. The laser reflector 53 is in close contact with the opposite side wall of the pressure testing machine to limit the overall position of the device.

[0045] The concrete tensile testing loading device according to this application is used to perform the concrete tensile test as follows: S1. Prepare a steel-bonded concrete tensile specimen with dimensions of 500mm×100mm×100mm, and attach steel plates with a thickness of 40mm to both ends of the specimen. The steel plates serve as the first connecting member 24 and the second connecting member 34. A threaded rod is formed on one side of the steel plate. S2. Screw the left and right ends of the threaded rod of the steel tension plate into the first threaded sleeve 23 and the second threaded sleeve 33 respectively; screw the first threaded rod 22 and the second threaded rod 32 into the first threaded sleeve 23 and the second threaded sleeve 33 respectively; pass the first threaded rod 22 and the second threaded rod 32 through the first connecting groove 211 of the fixed plate 21 and the second connecting groove 311 of the moving plate 31 respectively, adjust the concrete tensile specimen to the middle position inside the device according to the size of the concrete tensile specimen, and then fix it with the limiting nut; the limiting nut includes the first limiting nut and the second limiting nut mentioned above. The fixed plate 21 and the movable plate 31 are both 150mm high, the extension length of the first connecting groove 211 and the second connecting groove 311 is 50mm, and the height of the steel pull plate is set at 100mm. S3. Insert the other end of the first threaded rod 22 into the circular connecting hole on the left side wall of the pressure testing machine and fix it with the limit nut; connect the other end of the second threaded rod 32 to the laser range sensor 52 and adjust the position of the telescopic rod 54 so that the laser reflector 53 is in close contact with the side wall of the pressure testing machine; manually adjust the overall height of the device so that the loading plate 43 is close to the loading part of the pressure testing machine. S4. Start the pressure testing machine to apply vertical pressure to the device, so that the concrete tensile specimen bears a small tensile load, and check the linkage between the first hydraulic rod and the second hydraulic rod, as well as the working condition of the load sensor 51 and the laser rangefinder 52.

[0046] S5. Apply the load formally through displacement control, record the load and displacement changes of the concrete tensile specimen throughout the entire loading process, and stop the test after the specimen is completely destroyed; organize and analyze the test data to obtain the tensile properties of the concrete tensile specimen. S6. After the test, remove the limiting nut, the first threaded rod 22, the second threaded rod 32, the first threaded sleeve and the second threaded sleeve in sequence to remove the concrete tensile specimen removal device.

[0047] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0049] In the description of this utility model, "multiple" means two or more.

[0050] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0051] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A loading device for concrete tensile testing suitable for a compression testing machine, characterized in that, include: A base, on which a fixed plate and a movable plate are provided; The movable plate is adapted to move closer to or further away from the fixed plate along a first direction to adjust the distance between the fixed plate and the movable plate; A first tensioning assembly and a second tensioning assembly are provided. The first tensioning assembly is disposed on the fixed plate, and the second tensioning assembly is disposed on the movable plate. The first tensioning assembly and the second tensioning assembly are respectively connected to both sides of the concrete specimen to load the concrete specimen between the fixed plate and the movable plate. A loading assembly, comprising a loading plate and a load conversion mechanism, wherein the loading plate is adapted to connect to the loading part of the pressure testing machine, and the load conversion mechanism is connected to the movable plate; wherein... The loading section of the pressure testing machine is adapted to apply a pressure load in a second direction to the loading plate; the loading plate is connected to the load conversion mechanism to transfer the pressure load to the load conversion mechanism; a fluid medium cavity is formed in the load conversion mechanism to convert the fluid pressure in the second direction into the fluid pressure in the first direction, and push the moving plate to move along the first direction to apply a tensile load to the concrete specimen. A detection component is disposed on the first tensile component and / or the second tensile component to be suitable for collecting test parameters.

2. The concrete tensile testing loading device suitable for a compression testing machine according to claim 1, characterized in that, The fluid medium cavity includes a first medium cavity extending along a first direction and a second medium cavity extending along a second direction, and the fluid medium cavity is filled with hydraulic medium. The load switching mechanism includes: A first hydraulic rod is connected to the loading plate and communicates with the second medium cavity; the first hydraulic rod is adapted to reduce the volume of the second medium cavity under the pressure of the loading plate; the medium in the second medium cavity flows to the first medium cavity under pressure, so as to increase the volume of the first medium cavity; The second hydraulic rod is connected to the first medium cavity and the movable plate; when the volume of the first medium cavity increases, it pushes the second hydraulic rod to move, thereby driving the movable plate to move along the first direction.

3. The concrete tensile testing loading device suitable for a compression testing machine according to claim 2, characterized in that, The load switching mechanism includes: A first hydraulic cylinder and a second hydraulic cylinder, wherein the first hydraulic rod extends along a second direction and the second hydraulic rod extends along a first direction; the first hydraulic cylinder includes the first hydraulic rod and the second hydraulic cylinder includes the second hydraulic rod, and the rodless chamber of the first hydraulic cylinder communicates with the rodless chamber of the second hydraulic cylinder to form the fluid medium chamber.

4. The concrete tensile testing loading device suitable for a compression testing machine according to claim 3, characterized in that, Both the first hydraulic cylinder and the second hydraulic cylinder are constructed in multiples and connected in a one-to-one correspondence. The multiple first hydraulic cylinders are constructed in the same way and arranged in parallel. The multiple second hydraulic cylinders are constructed in the same way and arranged in parallel.

5. The concrete tensile testing loading device for a compression testing machine according to claim 1, characterized in that, The detection component includes: A load sensor is disposed on the first tension assembly to be suitable for real-time acquisition of tensile load data borne by the concrete specimen during the test; A laser rangefinder and a laser reflector are provided. The laser rangefinder is disposed on the second stretching assembly and is adapted to move with the moving plate. The laser reflector is fixedly disposed on the base and located on the side of the moving plate away from the fixed plate. The moving plate moves closer to or away from the laser reflector. The laser rangefinder collects its distance data from the laser reflector in real time.

6. The concrete tensile testing loading device for a compression testing machine according to claim 5, characterized in that, The first stretching component includes: A first connecting rod and a first connecting member, the first connecting rod being connected to the fixing plate, and the first connecting member being adapted to connect the concrete specimen; the load sensor is connected between the first connecting rod and the first connecting member, and is detachably connected to the first connecting member; The second tensioning component includes: The second connecting rod and the second connecting member are connected. The second connecting rod is connected to the movable plate. One end of the second connecting member is connected to one end of the second connecting rod. The other end of the second connecting member is adapted to connect to the concrete specimen. The laser rangefinder is located at the other end of the second connecting rod and faces the laser reflector.

7. The concrete tensile testing loading device for a compression testing machine according to claim 6, characterized in that, The fixing plate has a first connecting groove extending in the second direction, and the first connecting rod passes through the first connecting groove and is adapted to move along the first connecting groove to adjust the position of the first connecting member. The movable plate has a second connecting groove extending in a second direction, and the second connecting rod passes through the second connecting groove and is adapted to move along the second connecting groove to adjust the position of the second connecting member; The center line connecting the first connecting member and the second connecting member is arranged parallel to the first direction.

8. The concrete tensile testing loading device for a compression testing machine according to claim 3, characterized in that, Also includes: A first top plate and a second top plate, wherein the first top plate is connected to the fixed plate; The second top plate is connected to the movable plate; wherein, The first top plate and the second top plate extend along a first direction; the housing of the first hydraulic cylinder and / or the second hydraulic cylinder is connected to the first top plate, and the second hydraulic rod is connected to the second top plate.

9. The concrete tensile testing loading device for a pressure testing machine according to claim 5, characterized in that, Also includes: A telescopic rod, one end of which is connected to the base and the other end of which is connected to the laser reflector, to be adapted to adjust the relative position of the laser reflector and the fixed plate.

10. The concrete tensile testing loading device for a compression testing machine according to claim 9, characterized in that, The concrete tensile test loading device is suitable for assembly within the test space of a compression testing machine; wherein, The first tensile component is adapted to connect to one side wall of the compression testing machine, and the laser reflector is adapted to connect to the opposite side wall of the compression testing machine, so as to define the relative position of the concrete tensile testing loading device in the compression testing machine.

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