Concrete axial stretching fixed-section fracture device and method thereof
By designing a concrete axial tensile fixed section fracture device, using vacuum suction cups and hydraulic telescopic rods to ensure uniform load and fixed point fixation, the error problem in concrete tensile strength test is solved, and the precise measurement and strain of tensile strength indicators are achieved. Accurate recording of curves.
Patent Information
- Application Number
- CN202411361384.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2024-12-27
AI Technical Summary
In the concrete tensile strength test, it is difficult for the test piece to ensure the tension state of the axial center, resulting in errors in the tensile strength index test. The overall stiffness and test accuracy of the test machine are difficult to meet the requirements, and it is impossible to accurately test the peak after-decreasing section of the concrete specimen. stress strain curve.
A concrete axial tensile fixed cross-section fracture device is designed, including a workbench, a first cavity, an upper connection mechanism and a lower connection mechanism. Through vacuum suction cups and hydraulic telescopic rods and other components, the puller applies a uniform load to the test piece. , and the fracture cross-section of the sample is fixed to the fixed point through the positioning ring to reduce random errors.
Ensure that the concrete specimens are in a tensile state of axial center, reduce errors, and achieve accurate testing of concrete tensile strength indicators, be able to record data during the test process, and provide accurate stress and strain curves.
Smart Images
Figure CN119198346A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of concrete performance testing, in particular to a concrete axial tension fixed-section fracture device and a method thereof. Background Art
[0002] As a brittle material, concrete has high compressive strength but low tensile strength. The tensile strength of concrete is one of the important indicators reflecting the mechanical properties of concrete materials. At present, there are two major problems in the test of concrete tensile strength: first, it is difficult to ensure that the specimen is in an axial tensile state during the test, resulting in errors in the tensile strength index test; second, the overall stiffness and test accuracy of the testing machine are difficult to meet the test requirements, resulting in the inability to accurately test the stress-strain curve of the concrete specimen in the descending section after the peak. So far, the indirect tensile test method, such as splitting test and bending test, is still commonly used in the test of the tensile strength index of concrete. However, the stress state of concrete during the concrete splitting test and bending test is significantly different from that of the axial direct tensile test. The splitting test and bending test cannot replace the axial tensile test. The axial direct tensile test is the most suitable and basic test for obtaining the tensile strength index of concrete. It is also the only way to accurately obtain its ultimate tensile strain and total stress-strain curve. Therefore, the development of the axial direct tensile test device has very important theoretical significance and engineering application value.
[0003] Since it is difficult to ensure the fit between the concrete specimen and the pull head, the device cannot effectively ensure that the pull head in the rigid frame assembly applies a uniform load to the concrete specimen, and thus cannot determine whether the concrete specimen is in an axial tension state. At the same time, in the current axial tensile test, the fracture surface of the concrete specimen is randomly distributed and cannot be determined to a certain fixed cross-section, which further increases the test error. Summary of the invention
[0004] The purpose of the present invention is to provide a concrete axial tension fixed-section fracture device to solve the problems existing in the prior art.
[0005] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a concrete axial tensile fixed-section fracture device, including a workbench, a first cavity is provided in the workbench, an upper connecting mechanism is fixedly connected to the top of the first cavity, the upper connecting mechanism includes a first connecting part fixedly connected to the first cavity, the first connecting part is fixedly connected to a first fixing part, a lower connecting mechanism is fixedly connected to the bottom surface of the first cavity, the lower connecting mechanism includes a first driving part fixedly connected to the first cavity, a second fixing part is fixedly connected to the top surface of the first driving part, a to-be-tested piece is provided between the first fixing part and the second fixing part, a positioning ring is slidably connected to the to-be-tested piece, and protective mechanisms are symmetrically slidably connected to both sides of the first cavity.
[0006] Preferably, the first connecting portion includes a first connecting seat fixedly connected to the top surface of the first cavity, a first connecting rod fixedly connected to the bottom surface of the first connecting seat, and the first fixing portion fixedly connected to the bottom surface of the first connecting rod.
[0007] Preferably, the first fixing part includes a first fixing box fixedly connected to the first connecting rod, the bottom surface of the first fixing box is provided with a first opening, the top surface of the first fixing box is fixed with a vacuum suction cup, the vacuum suction cup is connected with a connecting pipe, the connecting pipe passes through the top surface of the first fixing box and is connected with an external air source, and a first limiter is symmetrically provided in the first fixing box.
[0008] Preferably, the first limiting member includes a first sliding box fixedly connected to the first fixed box, a first limiting seat is slidably connected to the first sliding box, a first connecting hole is provided in the first limiting seat, a first motor is fixedly connected to the outside of the first fixed box, an output shaft of the first motor passes through the side wall of the first fixed box and is fixedly connected to a first screw, and the first screw is adapted to the first connecting hole.
[0009] Preferably, the first driving part includes a second connecting seat fixedly connected to the bottom surface of the first cavity, the top surface of the second connecting seat is fixedly connected to the first hydraulic telescopic rod, and the top surface of the first hydraulic telescopic rod is fixedly connected to the second fixing part.
[0010] Preferably, the second fixing portion comprises a second fixing box fixedly connected to the first hydraulic telescopic rod, a second opening is provided on a top surface of the second fixing box, and second limiting members are symmetrically slidably connected to two sides of the second fixing box.
[0011] Preferably, the inner wall of the second fixed box is provided with a first sliding groove, a first slider is slidably connected in the first sliding groove, a second motor is fixedly connected in the second fixed box, a second lead screw is fixedly connected to the output shaft of the second motor, the second lead screw extends into the first sliding groove and is slidably connected to the first slider, a first groove is provided on the side of the first slider away from the first sliding groove, and a limiting plate is rotatably connected in the first groove.
[0012] Preferably, a first spring is fixedly connected to the top surface of the limiting plate located in the first groove.
[0013] Preferably, the side wall of the first cavity is symmetrically provided with a second slide groove, the protection mechanism is slidably connected in the second slide groove, the protection mechanism includes a second slider slidably connected in the second slide groove, a third motor is fixedly connected to the bottom surface of the second slide groove, a third screw is fixedly connected to the output shaft of the third motor, the third screw is slidably connected to the second slider, the end of the second slider away from the second slide groove is fixedly connected to the first electric telescopic rod, and the end of the first electric telescopic rod away from the telescopic second slider is fixedly connected to a protective plate.
[0014] A method for using a concrete axial tension fixed-section fracture device comprises the following steps:
[0015] A. Check the device to see if it is in the initial state, so as to facilitate the concrete axial tensile fixed section fracture test;
[0016] B. Install the sample to be tested between the first fixing part and the second fixing part, and adjust the position of the positioning ring;
[0017] C. Testing the test piece, moving the second fixing part downward by the first driving part to apply a tensile force to the test piece;
[0018] D. After recording is completed, the data of each node during the measurement process is statistically organized.
[0019] The present invention discloses the following technical effects: first, the top of the test piece is placed in the first fixing part for fixing, and after the fixing is completed, the second fixing part is moved upward to fix the bottom of the test piece, and after the fixing is completed, the first driving part is started, and the first fixing part is moved downward by the first driving part to apply tension to the test piece, and the data during the test is recorded. The present invention can ensure that the pull head in the rigid frame assembly applies a uniform load to the concrete specimen, thereby ensuring that the concrete specimen is in an axial tension state, and at the same time, by setting a positioning ring, the cross section of the sample fracture is fixed at a fixed point, reducing the influence of random errors. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a structural schematic diagram of the concrete axial tension fixed-section fracture device of the present invention;
[0022] Figure 2 for Figure 1 A partial enlarged view of middle A;
[0023] Figure 3 It is a structural schematic diagram of the bolt assembly in the present invention;
[0024] Figure 4 It is a structural schematic diagram of the clamping assembly in the present invention;
[0025] Among them, 1. workbench; 2. first cavity; 3. first connecting seat; 4. first connecting rod; 5. first fixed box; 6. first opening; 7. vacuum suction cup; 8. connecting pipe; 9. first sliding box; 10. first limit seat; 11. first connecting hole; 12. first motor; 13. first screw; 14. second connecting seat; 15. first hydraulic telescopic rod; 16. second fixed box; 17. second opening; 18. first slide groove; 19. first slider; 20. second motor; 21. second screw; 22. first groove; 23. limit plate; 24. first spring; 25. second slide groove; 26. second slider; 27. third motor; 28. third screw; 29. first electric telescopic rod; 30. protection plate; 31. positioning ring. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0028] Reference Figure 1-Figure 4 The present invention provides a concrete axial tensile fixed-section fracture device, including a workbench 1, a first cavity 2 is provided in the workbench 1, an upper connecting mechanism is fixedly connected to the top of the first cavity 2, the upper connecting mechanism includes a first connecting part fixedly connected to the first cavity 2, the first connecting part is fixedly connected to the first fixing part, a lower connecting mechanism is fixedly connected to the bottom surface of the first cavity 2, the lower connecting mechanism includes a first driving part fixedly connected to the first cavity 2, a second fixing part is fixedly connected to the top surface of the first driving part, a to-be-tested piece is provided between the first fixing part and the second fixing part, a positioning ring 31 is slidably connected to the to-be-tested piece, and a protective mechanism is symmetrically slidably connected to both sides of the first cavity 2.
[0029] First, the top of the test piece is placed in the first fixing part for fixing. After fixing, the second fixing part is moved upward to fix the bottom of the test piece. After fixing, the position of the positioning ring 31 is adjusted, and the first driving part is started. The first driving part is used to move the first fixing part downward to apply tension to the test piece, and the data of the test process is recorded.
[0030] According to a further optimized solution, the first connecting portion includes a first connecting seat 3 fixedly connected to the top surface of the first cavity 2, a first connecting rod 4 fixedly connected to the bottom surface of the first connecting seat 3, and a first fixing portion fixedly connected to the bottom surface of the first connecting rod 4.
[0031] A further optimized solution is that the first fixed part includes a first fixed box 5 fixedly connected to the first connecting rod 4, the bottom surface of the first fixed box 5 is provided with a first opening 6, the top surface of the first fixed box 5 is fixed with a vacuum suction cup 7, the vacuum suction cup 7 is connected to a connecting pipe 8, the connecting pipe 8 passes through the top surface of the first fixed box 5 and is connected to an external air source, and a first limit piece is symmetrically provided inside the first fixed box 5.
[0032] The top surface of the test piece is sucked by the vacuum suction cup 7 to preliminarily position and fix the test piece, and then the test piece is further fixed by the first limiting portion.
[0033] A further optimized solution is that the first limit member includes a first sliding box 9 fixedly connected to the first fixed box 5, a first limit seat 10 is slidably connected to the first sliding box 9, a first connecting hole 11 is provided in the first limit seat 10, a first motor 12 is fixedly connected to the outside of the first fixed box 5, the output shaft of the first motor 12 passes through the side wall of the first fixed box 5 and is fixedly connected to a first lead screw 13, and the first lead screw 13 is adapted to the first connecting hole 11.
[0034] The first motor 12 is started, and the output shaft of the first motor 12 drives the first lead screw 13 to rotate. The first lead screw 13 drives the first limit seat 10 to slide along the first sliding box 9, and makes the first limit seat 10 fit with the top of the test piece to fix the test piece.
[0035] According to a further optimized solution, the first driving part includes a second connecting seat 14 fixedly connected to the bottom surface of the first cavity 2, a first hydraulic telescopic rod 15 is fixedly connected to the top surface of the second connecting seat 14, and a second fixing part is fixedly connected to the top surface of the first hydraulic telescopic rod 15.
[0036] According to a further optimized solution, the second fixing portion includes a second fixing box 16 fixedly connected to the first hydraulic telescopic rod 15 , a second opening 17 is provided on the top surface of the second fixing box 16 , and second limit members are symmetrically slidably connected to both sides of the second fixing box 16 .
[0037] The first hydraulic telescopic rod 15 is started to extend, and the first hydraulic telescopic rod 15 drives the second fixing box 16 to approach the test piece, and fixes the bottom of the test piece through the second limiter.
[0038] A further optimized solution is that the inner wall of the second fixed box 16 is provided with a first slide groove 18, a first slider 19 is slidably connected in the first slide groove 18, a second motor 20 is fixedly connected in the second fixed box 16, a second lead screw 21 is fixedly connected to the output shaft of the second motor 20, the second lead screw 21 extends into the first slide groove 18 and is slidably connected to the first slider 19, a first groove 22 is provided on the side of the first slider 19 away from the first slide groove 18, and a limiting plate 23 is rotatably connected in the first groove 22.
[0039] According to a further optimized solution, a first spring 24 is fixedly connected to the top surface of the limiting plate 23 located in the first groove 22 .
[0040] After the bottom of the test piece enters the second fixed box 16, it contacts the limit plate 23, and the limit plate 23 rotates. After the bottom of the test piece enters under the limit plate 23, the limit plate 23 pops up under the elastic force of the spring, and then shortens the hydraulic telescopic rod, and the second fixed box 16 descends. The limit plate 23 is completely fitted with the bottom of the test piece to fix the bottom of the test piece.
[0041] A further optimized solution is that the side wall of the first cavity 2 is symmetrically provided with a second slide groove 25, and a protection mechanism is slidably connected in the second slide groove 25, the protection mechanism includes a second slider 26 slidably connected in the second slide groove 25, a third motor 27 is fixedly connected to the bottom surface of the second slide groove 25, and a third lead screw 28 is fixedly connected to the output shaft of the third motor 27, and the third lead screw 28 is slidably connected to the second slider 26, and the end of the second slider 26 away from the second slide groove 25 is fixedly connected to the first electric telescopic rod 29, and the end of the first electric telescopic rod 29 away from the telescopic second slider 26 is fixedly connected to a protective plate 30.
[0042] When the test piece reaches the tensile limit and breaks, the protection plate 30 is used to protect the broken test piece.
[0043] A method for using a concrete axial tension fixed-section fracture device comprises the following steps:
[0044] A. Check the device to see if it is in the initial state, so as to facilitate the concrete axial tensile fixed section fracture test;
[0045] B. Install the sample to be tested between the first fixing part and the second fixing part, and adjust the position of the positioning ring 31;
[0046] C. Testing the test piece, moving the second fixing part downward by the first driving part to apply a tensile force to the test piece;
[0047] D. After recording is completed, the data of each node during the measurement process is statistically organized.
[0048] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
Claims
1. A concrete axial tension fixed section fracture device, characterized in that: The invention comprises a workbench (1), wherein a first cavity (2) is provided in the workbench (1), an upper connecting mechanism is fixedly connected to the top of the first cavity (2), the upper connecting mechanism comprises a first connecting part fixedly connected to the first cavity (2), the first connecting part is fixedly connected to a first fixing part, a lower connecting mechanism is fixedly connected to the bottom surface of the first cavity (2), the lower connecting mechanism comprises a first driving part fixedly connected to the first cavity (2), a second fixing part is fixedly connected to the top surface of the first driving part, a to-be-tested object is provided between the first fixing part and the second fixing part, a positioning ring (31) is slidably connected to the to-be-tested object, and protective mechanisms are symmetrically slidably connected to the two sides of the first cavity (2).
2. The concrete axial tension fixed section fracture device according to claim 1, characterized in that: The first connecting portion comprises a first connecting seat (3) fixedly connected to the top surface of the first cavity (2), the bottom surface of the first connecting seat (3) is fixedly connected to a first connecting rod (4), and the bottom surface of the first connecting rod (4) is fixedly connected to the first fixing portion.
3. The concrete axial tension fixed section fracture device according to claim 2, characterized in that: The first fixing part comprises a first fixing box (5) fixedly connected to the first connecting rod (4), the bottom surface of the first fixing box (5) is provided with a first opening (6), the top surface of the first fixing box (5) is fixedly connected with a vacuum suction cup (7), the vacuum suction cup (7) is connected with a connecting pipe (8), the connecting pipe (8) passes through the top surface of the first fixing box (5) and is connected to an external air source, and a first limiter is symmetrically provided inside the first fixing box (5).
4. The concrete axial tension fixed section fracture device according to claim 3, characterized in that: The first limiting member comprises a first sliding box (9) fixedly connected to the first fixed box (5); a first limiting seat (10) is slidably connected to the first sliding box (9); a first connecting hole (11) is provided in the first limiting seat (10); a first motor (12) is fixedly connected to the outer side of the first fixed box (5); an output shaft of the first motor (12) passes through a side wall of the first fixed box (5) and is fixedly connected to a first lead screw (13); the first lead screw (13) is adapted to the first connecting hole (11).
5. The concrete axial tension fixed section fracture device according to claim 1, characterized in that: The first driving part comprises a second connecting seat (14) fixedly connected to the bottom surface of the first cavity (2), the top surface of the second connecting seat (14) is fixedly connected to a first hydraulic telescopic rod (15), and the top surface of the first hydraulic telescopic rod (15) is fixedly connected to the second fixing part.
6. The concrete axial tension fixed section fracture device according to claim 5, characterized in that: The second fixing portion comprises a second fixing box (16) fixedly connected to the first hydraulic telescopic rod (15), a second opening (17) is provided on the top surface of the second fixing box (16), and second limit members are symmetrically slidably connected on both sides of the second fixing box (16).
7. The concrete axial tension fixed section fracture device according to claim 6, characterized in that: The inner wall of the second fixed box (16) is provided with a first slide groove (18), a first slider (19) is slidably connected in the first slide groove (18), a second motor (20) is fixedly connected in the second fixed box (16), an output shaft of the second motor (20) is fixedly connected with a second lead screw (21), the second lead screw (21) extends into the first slide groove (18) and is slidably connected to the first slider (19), a first groove (22) is provided on a side of the first slider (19) away from the first slide groove (18), a limit plate (23) is rotatably connected in the first groove (22).
8. The concrete axial tension fixed section fracture device according to claim 7, characterized in that: A first spring (24) is fixedly connected to the top surface of the limiting plate (23) located in the first groove (22).
9. The concrete axial tension fixed section fracture device according to claim 1, characterized in that: The side wall of the first cavity (2) is symmetrically provided with a second slide groove (25), the protection mechanism is slidably connected in the second slide groove (25), the protection mechanism comprises a second slider (26) slidably connected in the second slide groove (25), a third motor (27) is fixedly connected to the bottom surface of the second slide groove (25), the output shaft of the third motor (27) is fixedly connected to a third lead screw (28), the third lead screw (28) is slidably connected to the second slider (26), one end of the second slider (26) away from the second slide groove (25) is fixedly connected to a first electric telescopic rod (29), and one end of the first electric telescopic rod (29) away from the telescopic second slider (26) is fixedly connected to a protection plate (30).
10. A method for using a concrete axial tension fixed-section fracture device, based on the concrete axial tension fixed-section fracture device according to any one of claims 1 to 9, characterized in that: The following steps are involved: A. Check the device to see if it is in the initial state, so as to facilitate the concrete axial tensile fixed section fracture test; B. Install the sample to be tested between the first fixing part and the second fixing part, and adjust the position of the positioning ring 31; C. Testing the test piece, moving the second fixing part downward by the first driving part to apply a tensile force to the test piece; D. After recording is completed, the data of each node during the measurement process is statistically organized.