Tensile test fixture for steel-concrete structure

Abstract

The utility model relates to the technical field of structure test in civil engineering, disclose the tensile test tool for steel -concrete structure, including protective housing, the inside of protective housing is provided with the pull -up mechanism, the outside bottom fixedly connected with support block of pull -up mechanism, the outside of pull -up mechanism is provided with fixed establishment, the fixed establishment includes support base plate, the outside fixedly connected with pneumatic cylinder of support base plate, the drive end fixedly connected with rack of pneumatic cylinder, the outside of support base plate is provided with limit component. In the utility model, through mechanical drive, linear motion is converted into rotary motion efficiently, and accurate displacement control is realized through screw drive, and the guiding and limiting of sliding block three are matched, so that the clamping force is evenly distributed to the test piece, the test error caused by eccentric clamping is effectively avoided, and stable and reliable guarantee is provided for the scientific detection of the tensile property of steel -concrete structure.

Description

Technical Field

[0001] This utility model relates to the field of structural testing technology in civil engineering, and in particular to tensile testing fixtures for reinforced concrete structures. Background Technology

[0002] With the booming development of the construction industry, reinforced concrete structures have become one of the core structural forms in modern building engineering due to their excellent mechanical properties and wide applicability. Accurately determining the tensile properties of reinforced concrete structures is a crucial step in assessing structural safety and ensuring project quality during engineering construction and materials research and development. This makes the performance of tensile testing fixtures used for reinforced concrete structures directly related to the reliability and validity of test data, thus making their research and optimization an important topic in the field of building materials testing.

[0003] Currently, most commercially available tensile testing fixtures for reinforced concrete structures employ mechanical clamping and tensile loading. Their working principle typically involves using simple clamps to fix the reinforced concrete specimen onto a testing platform, then applying tensile force to the specimen using a hydraulic or electric drive device. Simultaneously, sensors record the tensile force and deformation data to assess the tensile strength of the reinforced concrete structure.

[0004] In existing technologies, some tooling uses simple clamps that are difficult to control clamping force, which can easily cause the specimen to shift or tilt during the fixing process, resulting in uneven force during the test, affecting the accuracy of the test results, and causing trouble for engineering quality assessment and material performance research. Therefore, a tooling for tensile testing of steel-concrete structures is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a tensile testing fixture for steel-concrete structures, aiming to improve the problem of inaccurate specimen fixation in some existing devices.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tensile testing fixture for steel-concrete structures includes a protective shell, an internal lifting mechanism, a support block fixedly connected to the bottom of the lifting mechanism, a fixing mechanism on the outside of the lifting mechanism, a support base plate fixedly connected to the outside of the lifting mechanism, a cylinder fixedly connected to the outside of the support base plate, a rack fixedly connected to the drive end of the cylinder, and a limit assembly on the outside of the support base plate.

[0008] As a further description of the above technical solution:

[0009] The lifting mechanism includes a support limiting strip, the outside of which is fixedly connected to the inside of the protective shell, the bottom of which is fixedly connected to the top of the support block, and a fixed shaft is fixedly connected inside the support block.

[0010] As a further description of the above technical solution:

[0011] The limiting component includes a fixing plate, which is externally fixedly connected to the outside of the supporting base plate, and a sliding block three is slidably connected inside the supporting base plate;

[0012] As a further description of the above technical solution:

[0013] The sliding block three is externally fixedly connected to a connecting block, the connecting block is externally fixedly connected to a fixing block, and the connecting block is internally threadedly connected to a threaded rod.

[0014] As a further description of the above technical solution:

[0015] A transmission gear is fixedly connected to the outside of the threaded rod, and the external teeth of the transmission gear mesh with the external teeth of the rack.

[0016] As a further description of the above technical solution:

[0017] A motor is fixedly connected to the outside of the support block. A transmission wheel is fixedly connected to the drive end of the motor. A pull belt is coupled to the outside of the transmission wheel. A sliding block two is fixedly connected to one outer end of the pull belt, and a sliding block one is fixedly connected to the other outer end of the pull belt.

[0018] As a further description of the above technical solution:

[0019] The sliding block one is internally slidably connected to the outside of the fixed shaft, and the sliding block two is internally slidably connected to the outside of the fixed shaft;

[0020] As a further description of the above technical solution:

[0021] The sliding block one is rotatably connected to a friction ball inside, and the friction ball is rotatably connected to the outside of the fixed shaft. Two tension springs are fixedly connected to the top of the support block. The tension springs are fixedly connected to the outside of the sliding block one. The outside of the sliding block one is fixedly connected to the outside of the support base plate. The outside of the sliding block two is fixedly connected to the outside of the support base plate.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, linear motion is efficiently converted into rotational motion through mechanical transmission, and precise displacement control is achieved through threaded transmission. With the guide and limit of sliding block three, the clamping force is evenly distributed on the specimen, effectively avoiding test errors caused by clamping eccentricity, and greatly improving the accuracy and reliability of test data. At the same time, automated operation reduces manual intervention, improves test efficiency and safety, and provides a stable and reliable guarantee for the scientific testing of the tensile properties of steel-concrete structures.

[0024] 2. In this utility model, the synchronous and smooth movement of the sliding block is achieved through belt drive, ensuring uniform tension on the specimen. The rolling design of the friction ball converts sliding friction into rolling friction, significantly reducing motion resistance and minimizing equipment wear and energy waste. The elastic buffer structure effectively absorbs the impact force and vibration during the loading process, avoiding interference from stress changes on the test data. Combined with real-time sensor monitoring technology, it can accurately capture changes in the mechanical properties of the specimen, providing a stable and accurate test environment for the tensile strength evaluation of steel-concrete structures, and promoting the scientific and standardized research on engineering material properties. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the tensile testing fixture for steel-concrete structures proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the fixing block structure of the tensile testing fixture for steel-concrete structures proposed in this utility model;

[0027] Figure 3 This is a schematic diagram of the support and limiting strip of the tensile testing fixture for steel-concrete structures proposed in this utility model;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0030] Legend:

[0031] 1. Protective casing; 2. Lifting mechanism; 21. Support limit bar; 22. Motor; 23. Transmission wheel; 24. Pull belt; 25. Pull spring; 26. Sliding block one; 27. Sliding block two; 28. Friction ball; 3. Fixing mechanism; 31. Cylinder; 32. Rack; 33. Transmission gear; 34. Support base plate; 35. Threaded rod; 36. Connecting block; 37. Fixing block; 38. Limiting assembly; 381. Fixing plate; 382. Sliding block three; 4. Support block; 5. Fixing shaft. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of a tensile testing fixture for steel-concrete structures, including a protective shell 1. The protective shell 1 is used to prevent the specimen from breaking and splashing or the parts from loosening during the test, which could cause injury to the operator. The protective shell 1 is equipped with a lifting mechanism 2, which provides tensile loading to the steel-concrete specimen to simulate the stress state under actual working conditions. A support block 4 is fixedly connected to the bottom of the lifting mechanism 2. The support block 4 is used to transfer the weight of the lifting mechanism 2 and the reaction force generated during the test to the fixture foundation. A fixing mechanism 3 is provided on the outside of the lifting mechanism 2. The fixing mechanism 3 is used to fix the steel-concrete specimen and ensure that the specimen is stable in position during the tensile loading process.

[0034] The fixing mechanism 3 includes a support base plate 34, which provides an installation plane for the cylinder 31 and the limiting component 38 to ensure that the relative positions of each component are fixed. The support base plate 34 is externally fixedly connected to the outside of the lifting mechanism 2. The cylinder 31 is externally fixedly connected to the support base plate 34. The cylinder 31 is used to push the drive end to extend or retract by compressed gas, providing linear motion power for the rack 32 to realize automated clamping operation. The drive end of the cylinder 31 is fixedly connected to the rack 32. The rack 32 is used to convert the linear thrust of the cylinder 31 into the rotational power of the transmission gear 33. Through meshing with the transmission gear 33, the transmission of force and the conversion of motion form are realized. The limiting component 38 is provided on the outside of the support base plate 34.

[0035] The limiting component 38 includes a fixing plate 381, which serves as the mounting reference for the limiting component 38 and is fixed to the support base plate 34. The fixing plate 381 provides fixed support for the sliding track of the sliding block 382, ​​ensuring the accuracy of its sliding direction. The fixing plate 381 is externally fixedly connected to the outside of the support base plate 34. The sliding block 382 is slidably connected inside the support base plate 34. The sliding block 382 is fixedly connected to the connecting block 36 and slides along a preset track within the support base plate 34, restricting the degree of freedom of movement of the connecting block 36. The connecting block 36 is externally fixedly connected to the sliding block 382 and is used to control the rotation of the threaded rod 35. The motion is converted into its own linear motion. The connecting block 36 is externally fixedly connected to a fixing block 37, which is used to directly contact the steel-concrete specimen and fix the specimen to the support base plate 34 by clamping force. The connecting block 36 is internally threadedly connected to a threaded rod 35. The threaded rod 35 accurately converts the rotational motion of the transmission gear 33 into the linear displacement of the connecting block 36 through the thread transmission principle. The threaded rod 35 is externally fixedly connected to a transmission gear 33, which meshes with the rack 32 to convert the linear motion of the rack 32 into the rotational motion of the threaded rod 35. The external locking teeth of the transmission gear 33 mesh with the external locking teeth of the rack 32.

[0036] Reference Figure 1 , Figure 3 and Figure 5 The lifting mechanism 2 includes a support limiting strip 21, which is fixed inside the protective shell 1 to provide guidance and limitation for the sliding of sliding block 1 26 and sliding block 27. The outside of the support limiting strip 21 is fixedly connected to the inside of the protective shell 1, and the bottom of the support limiting strip 21 is fixedly connected to the top of the support block 4. The inside of the support block 4 is fixedly connected to a fixed shaft 5, which provides support and positioning for the sliding shaft of sliding block 1 26 and sliding block 27.

[0037] A motor 22 is fixedly connected to the outside of the support block 4. The motor 22 is used to drive the transmission wheel 23 to rotate. The drive end of the motor 22 is fixedly connected to the transmission wheel 23. The transmission wheel 23 transmits the rotational power of the motor 22 to the pull belt 24. The pull belt 24 converts the rotational motion of the transmission wheel 23 into the linear motion of the first sliding block 26 and the second sliding block 27. At the same time, it has a certain elasticity to ensure that the tension loading process is smooth. The pull belt 24 is externally coupled to the transmission wheel 23. The second sliding block 27 is fixedly connected to one outer end of the pull belt 24, and the first sliding block 26 is fixedly connected to the other outer end of the pull belt 24.

[0038] The sliding block 26 is internally slidably connected to the outside of the fixed shaft 5, and the sliding block 27 is internally slidably connected to the outside of the fixed shaft 5. A friction ball 28 is rotatably connected inside the sliding block 26. The friction ball 28 converts the sliding friction between the sliding block 26 and the fixed shaft 5 into rolling friction. The friction ball 28 is externally rotatably connected to the outside of the fixed shaft 5. Two tension springs 25 are fixedly connected to the top of the support block 4. The tension springs 25 undergo elastic deformation when the sliding block 26 moves, which plays a role in buffering and shock absorption, absorbing the impact and vibration during the tensile loading process, and preventing sudden changes in tensile force from damaging the specimen. The tension springs 25 are externally fixedly connected to the outside of the sliding block 26. The outside of the sliding block 26 is fixedly connected to the outside of the support base plate 34, and the outside of the sliding block 27 is fixedly connected to the outside of the support base plate 34.

[0039] Working principle: The steel-concrete structure specimen to be tested is placed on the support base plate 34. The specimen position is determined to be centered in the fixture to ensure uniform force distribution. The cylinder 31 extends to drive the rack 32, which moves linearly. This linear motion of the rack 32 is converted into the rotational motion of the transmission gear 33. The transmission gear 33 drives the threaded rod 35 to rotate. The threaded rod 35 is threadedly connected to the connecting block 36. Under the action of the threaded transmission, the connecting block 36 moves axially along the threaded rod 35. The connecting block 36 drives the fixing block 37 to move towards the specimen until the fixing block 37 clamps the specimen. The sliding block 382 slides within the support base plate 34, guiding and limiting the movement of the connecting block 36, ensuring that the fixing block 37 smoothly approaches the specimen and avoiding deviation that could lead to uneven clamping force.

[0040] The motor 22 drives the transmission wheel 23 to rotate. The transmission wheel 23 pulls the belt 24, which in turn drives the sliding block 1 26 and the sliding block 27 to slide on the fixed shaft 5. The sliding block 1 26 and the sliding block 27 are fixedly connected to the support base plate 34, thereby pulling the entire fixed mechanism 3 and applying a tensile force to the steel-concrete structure specimen fixed on the fixed mechanism 3. The friction ball 28 rotates between the sliding block 1 26 and the fixed shaft 5, reducing the friction force when the sliding block 1 26 slides, making the sliding process smoother. At the same time, the pulling spring 25 undergoes elastic deformation when the sliding block 1 26 moves, which can buffer the change of tensile force to a certain extent, making the tensile loading process more stable. During the tensile loading process, the force and deformation data of the specimen can be monitored in real time by displacement sensors and force sensors.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tensile testing fixture for reinforced concrete structures, comprising a protective outer shell (1), characterized in that: The protective shell (1) is provided with a lifting mechanism (2) inside, and a support block (4) is fixedly connected to the bottom of the outer side of the lifting mechanism (2). A fixing mechanism (3) is provided on the outside of the lifting mechanism (2). The fixing mechanism (3) includes a support base plate (34), which is fixedly connected to the outside of the lifting mechanism (2). A cylinder (31) is fixedly connected to the outside of the support base plate (34), and a rack (32) is fixedly connected to the drive end of the cylinder (31). A limit component (38) is provided on the outside of the support base plate (34).

2. The tensile testing fixture for reinforced concrete structures according to claim 1, characterized in that: The lifting mechanism (2) includes a support limiting strip (21), the outside of which is fixedly connected to the inside of the protective shell (1), the bottom of which is fixedly connected to the top of the support block (4), and a fixed shaft (5) is fixedly connected inside the support block (4).

3. The tensile testing fixture for reinforced concrete structures according to claim 1, characterized in that: The limiting component (38) includes a fixing plate (381), which is fixedly connected to the outside of the supporting base plate (34), and a sliding block three (382) is slidably connected inside the supporting base plate (34).

4. The tensile testing fixture for reinforced concrete structures according to claim 3, characterized in that: The sliding block three (382) is externally fixedly connected to a connecting block (36), the connecting block (36) is externally fixedly connected to a fixing block (37), and the connecting block (36) is internally threadedly connected to a threaded rod (35).

5. The tensile testing fixture for reinforced concrete structures according to claim 4, characterized in that: The threaded rod (35) is externally fixedly connected to a transmission gear (33), and the external teeth of the transmission gear (33) mesh with the external teeth of the rack (32).

6. The tensile testing fixture for reinforced concrete structures according to claim 2, characterized in that: A motor (22) is fixedly connected to the outside of the support block (4). A transmission wheel (23) is fixedly connected to the drive end of the motor (22). A pull belt (24) is coupled to the outside of the transmission wheel (23). A sliding block two (27) is fixedly connected to one end of the outer side of the pull belt (24). A sliding block one (26) is fixedly connected to the other end of the outer side of the pull belt (24).

7. The tensile testing fixture for reinforced concrete structures according to claim 6, characterized in that: The sliding block one (26) is internally slidably connected to the outside of the fixed shaft (5), and the sliding block two (27) is internally slidably connected to the outside of the fixed shaft (5).

8. The tensile testing fixture for reinforced concrete structures according to claim 7, characterized in that: The sliding block one (26) is rotatably connected to a friction ball (28), and the friction ball (28) is rotatably connected to the outside of the fixed shaft (5). The top of the support block (4) is fixedly connected to two pull springs (25), and the pull springs (25) are fixedly connected to the outside of the sliding block one (26). The outside of the sliding block one (26) is fixedly connected to the outside of the support base plate (34). The outside of the sliding block two (27) is fixedly connected to the outside of the support base plate (34).

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