Concrete axial tensile stress testing device

Abstract

The invention discloses a concrete axial tensile stress testing device, and relates to the technical field of concrete tests.The concrete axial tensile stress testing device comprises a testbed, fixing blocks are symmetrically and fixedly connected to the top face of the testbed, grooves are formed in the tops of the fixing blocks, connecting shafts are slidably connected into the grooves, one ends of pressure plates are rotatably connected to the connecting shafts, and driving assemblies are hinged to the other ends of the pressure plates; a stretching plate is fixedly connected to the outer side of the connecting shaft and fixedly connected with a connecting assembly, a clamping assembly is detachably connected to the end, away from the stretching plate, of the connecting assembly, and a protection assembly is arranged on the outer side of the middle of the sample and fixedly connected with the top face of the test bed. Downward pressure is applied to the two pressure plates through the driving assembly, so that stress balance of the two ends is guaranteed, the test precision is improved, a sample is stably and powerfully fixed through the clamping assembly, slippage in the test process can be prevented, residues exploded when the sample is broken are collected through the protection assembly, workers are prevented from being hurt, and the test efficiency is improved. And the safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete testing, in particular to a concrete axial tensile stress testing device. Background Art

[0002] The axial tensile test of concrete uses the method of direct tensile specimens to determine the axial tensile strength, ultimate tensile value and tensile elastic modulus of concrete. It is one of the most direct, objective and effective methods to determine the full tensile stress-strain curve of concrete.

[0003] A concrete axial tensile test device is disclosed in the prior art, with the publication number CN216594546U, comprising a concrete specimen, two steel plates are symmetrically arranged on both sides of the concrete specimen, a plurality of embedded steel bars are arranged inside the steel plates, a ball seat is connected to the outside of the steel plates, a connecting rod is arranged outside the ball seat, rotating balls are connected to the two ends of the connecting rod, a connecting sleeve is arranged outside the connecting rod, a spherical groove is opened inside the connecting sleeve, an opening is opened on the left side of the connecting sleeve, a plurality of rollers are connected to the side of the steel plate, a limit plate is arranged outside the roller, a limit groove is opened inside the middle of the limit plate, a threaded rod is connected to the lower part of the limit plate, a bevel gear A is connected to the inner end of the threaded rod, a bevel gear B is arranged below the plurality of bevel gears A, a motor is arranged below the bevel gear B, a mounting frame is arranged outside the motor, and a hydraulic telescopic rod is arranged on the upper part of the mounting frame. In the above prior art, the specimen is placed vertically, and it is difficult to ensure that the pulling force at both ends is the same when the specimen is stretched due to gravity, so that the smooth completion of the test cannot be ensured.

[0004] The prior art discloses a concrete splitting tensile strength test detection device, the publication number is CN212748536U, including a pad, two pads, the two pads are arranged oppositely, the two pads are arranged on both sides of the concrete specimen, the side of the pad away from the concrete specimen is arranged as a plane, a positioning rod is arranged between the two pads, the positioning rod and the pad are arranged vertically, there are two positioning rods, the two positioning rods are arranged oppositely and parallelly on both sides of the concrete specimen, the positioning rods are provided with a limiting groove along the axial direction, and the pads are inserted into the inside of the limiting groove. The above-mentioned prior art clamps the two ends of the sample respectively by two clamps, and then reversely stretches it. In actual operation, it is difficult to ensure that the two ends are stressed at the same time, so that the fracture position of the axial tension specimen often falls outside the strain measurement point, and there is no protective structure, and the flying fragments are easy to cause harm to the staff.

[0005] In summary, the tensile device in the prior art is generally operated by two tensioners at the same time. During the test, it cannot ensure that both ends are subjected to more balanced forces, thereby increasing the test error. In addition, there is no protective structure. When the concrete breaks, it is easy to splash and cause accidental injuries to the operator. Moreover, the clamping structure is not firm and is prone to slippage, thereby affecting the accuracy of the test results.

[0006] Therefore, a concrete axial tensile stress testing device is urgently needed to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a concrete axial tensile stress testing device to solve the problems existing in the prior art.

[0008] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a concrete axial tensile stress testing device, including a test bench, wherein the four corners of the bottom surface of the test bench are respectively fixed with supporting legs, and the top surface of the test bench is symmetrically fixed with a fixed block, and the top of the fixed block is provided with a groove, and a connecting shaft is slidably connected in the groove, and one end of the pressure plate is rotatably connected to the connecting shaft, and the other end of the pressure plate is hinged with a driving assembly, and the driving assembly is fixed to the test bench, and a tensile plate is fixed to the outer side of the connecting shaft, and the tensile plate is fixed with a connecting assembly, and the end of the connecting assembly away from the tensile plate is detachably connected with a clamping assembly, and the clamping assembly is sleeved on the end of the specimen, and a protective assembly is arranged on the middle outer side of the specimen, and the protective assembly is fixed to the top surface of the test bench.

[0009] Preferably, the clamping assembly includes a ring sleeve which is sleeved on the outside of the sample, a second arc plate is symmetrically installed inside the ring sleeve, the second arc plate is used to clamp the sample, and the second arc plate is rotatably connected to a second threaded rod on the side away from the sample, the second threaded rod extends out of the ring sleeve and is threadedly connected to the ring sleeve.

[0010] Preferably, an arc groove is provided in the ring sleeve, a first arc plate is slidably connected in the arc groove, a first threaded rod is rotatably connected to the first arc plate, the first threaded rod is sleeved on the outside of the second threaded rod and extends out of the ring sleeve, the first threaded rod is threadedly connected to the ring sleeve, a plurality of first springs are fixedly connected at equal intervals on a side of the first arc plate away from the first threaded rod, and one end of the first spring away from the first arc plate is fixedly connected to the second arc plate.

[0011] Preferably, a plurality of protrusions are fixedly connected to the inner side of the second arc-shaped plate, and the protrusions are in contact with the sample.

[0012] Preferably, the protection component includes a base fixedly connected to the top surface of the test bench, a protection box is fixedly connected to the top surface of the base, the sample passes through the protection box, a flexible pad is fixedly connected to the inner wall of the protection box, and monitoring components are installed around the inside of the protection box.

[0013] Preferably, the monitoring component comprises a conical cylinder fixedly connected to the inner wall of the protective box, an electric push rod is fixedly connected inside the conical cylinder, a high-definition camera is fixedly connected to the output end of the electric push rod, and the high-definition camera is directed toward the sample.

[0014] Preferably, the driving assembly includes a connecting frame fixedly connected to the top surface of the test bench, a jack is fixedly connected to the top of the connecting frame, a connecting plate is fixedly connected to the output end of the jack, and the tops of the two pressure plates are respectively hinged to the connecting plates.

[0015] Preferably, the connecting assembly includes a connecting column fixedly connected to the side wall of the stretching plate, the end of the connecting column away from the stretching plate is fixedly connected to a first pull ring, the first pull ring fixing sleeve is provided with a second pull ring, the second pull ring is detachably connected to an arc rod, the two ends of the arc rod are respectively fixed with connecting blocks, and the connecting blocks are fixed to the outer side of the ring sleeve.

[0016] Preferably, a connecting head is symmetrically fixed to the bottom of the pressure plate, and the connecting head is sleeved on the outside of the connecting shaft and is rotatably connected to the connecting shaft.

[0017] Preferably, sliding grooves are symmetrically opened in the groove, both ends of the connecting shaft extend into the sliding grooves and are slidably connected to the sliding grooves, one end of a second spring is fixedly connected to the side of the sliding groove away from the connecting shaft, and the other end of the second spring is fixedly connected to a sliding plate, the sliding plate is slidably connected to the sliding groove, limiting rods are symmetrically fixedly connected on both sides of the sliding plate, limiting grooves are symmetrically opened in the sliding groove, the limiting rods are located in the limiting grooves and are slidably connected to the limiting grooves.

[0018] The invention discloses the following technical effects: when in use, the sample is passed through the protective component, and the two ends are fixed by the clamping component, and the clamping component is connected to the stretching plate through the connecting component. At this time, the driving component is started, the driving component squeezes the pressure plate, and the pressure plate drives the connecting shaft to slide in the groove of the fixed block to the side away from the sample, the connecting shaft drives the connecting component to move, and the connecting component drives the clamping component to move, thereby generating axial tension on both ends of the sample, and a tension sensor can be installed on the stretching plate, and the data is transmitted to the computer through the sensor to form a line graph, which is convenient for analysis; the legs support the test bench to ensure the stability of the operation process; the end of the fixed block is provided with an opening, and the opening is connected to the groove to prevent the pressure plate from generating movement obstacles when rotating, and ensure the smoothness of the operation process. The invention applies downward pressure to the two pressure plates through the driving component, thereby ensuring the force balance at both ends, improving the test accuracy, and stably and forcefully fixes the sample through the clamping component, which can prevent slippage during the test, and also collects the residues that collapse when the sample breaks through the protective component to avoid hurting the staff, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 For the present invention Figure 1 A partial enlarged view of middle A;

[0022] Figure 3 For the present invention Figure 1 A partial enlarged view of B in the middle;

[0023] Figure 4 It is a structural schematic diagram of the fixing block of the present invention;

[0024] Figure 5 is a cross-sectional view of the ring sleeve of the present invention;

[0025] Figure 6 is a cross-sectional view of the protective box of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the internal slide groove of the fixed block of the present invention;

[0027] Figure 8 is a side view of a sliding plate of the present invention;

[0028] Among them, 1. test bench; 2. support leg; 3. fixed block; 4. groove; 5. slide; 6. pressure plate; 7. connecting plate; 8. jack; 9. connecting frame; 10. protective box; 11. base; 12. stretching plate; 13. connecting column; 14. first pull ring; 15. second pull ring; 16. arc rod; 17. connecting block; 18. ring sleeve; 19. first threaded rod; 20. second threaded rod; 21. test specimen; 22. connecting head; 23. connecting shaft; 24. arc groove; 25. first arc plate; 26. first spring; 27. second arc plate; 28. bump; 29. ​​flexible pad; 30. conical cylinder; 31. electric push rod; 32. high-definition camera; 33. second spring; 34. limit groove; 35. limit rod; 36. sliding plate. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] Reference Figure 1-Figure 8 The present invention provides a concrete axial tensile stress testing device, comprising a test bench 1, wherein the four corners of the bottom surface of the test bench 1 are respectively fixed with supporting legs 2, a fixing block 3 is symmetrically fixedly connected to the top surface of the test bench 1, a groove 4 is provided on the top of the fixing block 3, a connecting shaft 23 is slidably connected in the groove 4, one end of a pressure plate 6 is rotatably connected to the connecting shaft 23, the other end of the pressure plate 6 is hinged with a driving component, the driving component is fixedly connected to the test bench 1, a tensile plate 12 is fixedly connected to the outer side of the connecting shaft 23, the tensile plate 12 is fixedly connected to the connecting component, the end of the connecting component away from the tensile plate 12 is detachably connected with a clamping component, the clamping component is sleeved on the end of a sample 21, a protective component is provided on the middle outer side of the sample 21, and the protective component is fixedly connected to the top surface of the test bench 1.

[0032] When in use, the sample 21 passes through the protective assembly, and the two ends are fixed by the clamping assembly, and the clamping assembly is connected to the stretching plate 12 through the connecting assembly. At this time, the driving assembly is started, and the driving assembly squeezes the pressure plate 6, and the pressure plate 6 drives the connecting shaft 23 to slide in the groove 4 of the fixed block 3 to the side away from the sample 21, and the connecting shaft 23 drives the connecting assembly to move, and the connecting assembly drives the clamping assembly to move, thereby generating axial tension on both ends of the sample 21. A tension sensor can be installed on the stretching plate 12, and the data is transmitted to the computer through the sensor to form a line graph for easy analysis; the legs 2 support the test bench 1 to ensure the stability of the operation process; the end of the fixed block 3 is provided with an opening, and the opening is connected to the groove 4 to prevent the pressure plate 6 from generating movement obstacles when rotating, and ensure the smoothness of the operation process. The present invention applies downward pressure to the two pressure plates 6 through the driving assembly, thereby ensuring the force balance at both ends, improving the test accuracy, and stably and forcefully fixes the sample 21 through the clamping assembly, which can prevent slippage during the test, and also collects the residues that collapse when the sample 21 breaks through the protective assembly to avoid hurting the staff and improve safety.

[0033] In a further optimized solution, the clamping assembly includes a ring sleeve 18 sleeved on the outside of the sample 21, and a second arc plate 27 is symmetrically installed in the ring sleeve 18. The second arc plate 27 is used to clamp the sample 21. The second arc plate 27 is rotatably connected to the side away from the sample 21 with a second threaded rod 20, and the second threaded rod 20 extends out of the ring sleeve 18 and is threadedly connected to the ring sleeve 18. When the sample 21 is fixed, the second threaded rod 20 is rotated, and the second threaded rod 20 is threadedly connected to the ring sleeve 18, so that the second threaded rod 20 moves, and the second threaded rod 20 pushes the second arc plate 27, and the second arc plate 27 moves to the side close to the sample 21 until it contacts and fits tightly with the sample 21, thereby improving the stability of the clamping and preventing slippage or displacement during operation.

[0034] Further optimized solution, an arc groove 24 is provided in the annular sleeve 18, a first arc plate 25 is slidably connected in the arc groove 24, a first threaded rod 19 is rotatably connected to the first arc plate 25, the first threaded rod 19 is sleeved outside the second threaded rod 20 and extends out of the annular sleeve 18, the first threaded rod 19 is threadedly connected to the annular sleeve 18, a plurality of first springs 26 are fixedly connected at equal intervals on the side of the first arc plate 25 away from the first threaded rod 19, and one end of the first spring 26 away from the first arc plate 25 is fixedly connected to the second arc plate 27. The first threaded rod 19 is rotated, the first threaded rod 19 is sleeved outside the second threaded rod 20 and has a clearance fit with the second threaded rod 20, the first threaded rod 19 moves, and pushes the first arc plate 25 to slide in the arc groove 24, the first arc plate 25 squeezes the first spring 26 when it moves, the first spring 26 is squeezed to generate a reaction force, and the reaction force of the first spring 26 further reinforces the second arc plate 27 to prevent loosening.

[0035] In a further optimized solution, a plurality of protrusions 28 are fixedly connected to the inner side of the second curved plate 27, and the protrusions 28 are in contact with the sample 21. The arrangement of the protrusions 28 increases the friction between the second curved plate 27 and the sample 21, thereby enhancing the adhesion, and a high-strength adhesive is applied to both the protrusions 28 and the second curved plate 27, thereby further ensuring the stability of the clamping.

[0036] Further optimization scheme, the protection component includes a base 11 fixed to the top surface of the test bench 1, a protection box 10 fixed to the top surface of the base 11, the sample 21 passes through the protection box 10, the inner wall of the protection box 10 is fixed with a flexible pad 29, and monitoring components are installed around the protection box 10. When the sample 21 breaks, the splashing residue hits the flexible pad 29 inside the protection box 10, which reduces the impact force of the residue and reduces the noise during the collision, which is safer; since the break of the sample 21 is unlikely to occur in the middle as expected, the specific break position is random, so the size of the protection box 10 can be determined according to the specific test situation, and the protection box 10 can cover most of the sample 21, and prevent splashing when the sample 21 breaks as much as possible, which may injure the staff; the protection box 10 can play an auxiliary supporting role for both ends of the sample 21, prevent a large deviation when one side of the sample 21 breaks, and ensure that the axial tension is at the axial position of the sample 21 as much as possible.

[0037] Further optimization scheme, the monitoring assembly includes a conical cylinder 30 fixedly connected to the inner wall of the protective box 10, an electric push rod 31 is fixedly connected inside the conical cylinder 30, and a high-definition camera 32 is fixedly connected to the output end of the electric push rod 31, and the high-definition camera faces the sample 21. After the test starts, the electric push rod 31 pushes the high-definition camera 32 to move toward the sample 21 until it moves to the end of the conical cylinder 30, and the high-definition camera 32 captures the moment when the sample 21 breaks, which is convenient for later observation and recording; the setting of the conical cylinder 30 can protect the high-definition camera 32 from being damaged and extend the service life of the device.

[0038] Further optimizing the scheme, the driving assembly includes a connecting frame 9 fixed to the top surface of the test bench 1, a jack 8 fixed to the top of the connecting frame 9, a connecting plate 7 fixed to the output end of the jack 8, and the tops of the two pressure plates 6 are respectively hinged to the connecting plates 7. The connecting frame 9 fixes and supports the jack 8, provides a fulcrum for the jack 8, and the jack 8 extends to push the connecting plate 7 downward, and the connecting plate 7 causes the two pressure plates 6 hinged thereto to rotate, so that the bottom of the pressure plate 6 slides in the groove 4, ensuring that the tension at both ends of the sample 21 is the same, thereby improving the accuracy of the test.

[0039] Further optimized solution, the connection assembly includes a connection column 13 fixedly connected to the side wall of the stretching plate 12, the end of the connection column 13 away from the stretching plate 12 is fixedly connected to the first pull ring 14, the first pull ring 14 is fixedly sleeved with a second pull ring 15, the second pull ring 15 is detachably connected to the arc rod 16, the two ends of the arc rod 16 are respectively fixedly connected to the connection block 17, and the connection block 17 is fixedly connected to the outer side of the ring sleeve 18. The stretching plate 12 is fixedly connected to the first pull ring 14 through the connection column 13, and the second pull ring 15 connects the first pull ring 14 and the arc rod 16 together to facilitate the test, and the second pull ring 15 and the arc rod 16 can be disassembled to facilitate the storage after use and save space; the connection block 17 is used to connect the arc rod 16 and the ring sleeve 18, and the middle of the arc rod 16 is connected to the second pull ring 15 to ensure uniform force.

[0040] In a further optimized solution, a connector 22 is symmetrically fixed to the bottom of the pressure plate 6, and the connector 22 is sleeved outside the connecting shaft 23 and is rotatably connected to the connecting shaft 23. The connector 22 improves the rotation performance of the connecting shaft 23 and the pressure plate 6, makes it easier to drive the connecting shaft 23 to slide, reduces friction with the connecting shaft 23, and improves the test accuracy.

[0041] Further optimization scheme, the groove 4 is symmetrically provided with a slide groove 5, the two ends of the connecting shaft 23 extend into the slide groove 5 and are slidably connected with the slide groove 5, one end of the second spring 33 is fixedly connected to the side of the slide groove 5 away from the connecting shaft 23, the other end of the second spring 33 is fixedly connected to the sliding plate 36, the sliding plate 36 is slidably connected with the slide groove 5, the two sides of the sliding plate 36 are symmetrically fixed with the limit rod 35, the slide groove 5 is symmetrically provided with a limit groove 34, the limit rod 35 is located in the limit groove 34 and is slidably connected with the limit groove 34. After the test is completed, in order to prevent the connecting shaft 23 from continuing to slide in the slide groove 5 due to inertia, the second spring 33 and the sliding plate 36 are provided, which can play a buffering role on the connecting shaft 23 and prevent the connecting shaft 23 from being damaged; the sliding plate 36 drives the limit rod 35 to slide in the limit groove 34 to prevent the sliding plate 36 from being separated from the slide groove 5, thereby ensuring its good sliding performance.

[0042] 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.

[0043] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A concrete axial tensile stress testing device, characterized in that: The test bench (1) comprises a test bench (1), wherein the four corners of the bottom surface of the test bench (1) are respectively fixedly connected with supporting legs (2), and the top surface of the test bench (1) is symmetrically fixedly connected with a fixing block (3), and the top of the fixing block (3) is provided with a groove (4), and a connecting shaft (23) is slidably connected in the groove (4), and one end of a pressure plate (6) is rotatably connected to the connecting shaft (23), and the other end of the pressure plate (6) is hingedly connected with a driving component, and the driving component is fixedly connected to the test bench (1), and a tension plate (12) is fixedly connected to the outer side of the connecting shaft (23), and the tension plate (12) is fixedly connected with a connecting component, and the end of the connecting component away from the tension plate (12) is detachably connected with a clamping component, and the clamping component is sleeved on the end of a sample (21), and a protective component is arranged on the middle outer side of the sample (21), and the protective component is fixedly connected to the top surface of the test bench (1).

2. The concrete axial tensile stress testing device according to claim 1 is characterized in that: The clamping assembly comprises a ring sleeve (18) sleeved on the outside of the sample (21), a second arc plate (27) is symmetrically installed in the ring sleeve (18), the second arc plate (27) is used to clamp the sample (21), and a second threaded rod (20) is rotatably connected to the side of the second arc plate (27) away from the sample (21), and the second threaded rod (20) extends out of the ring sleeve (18) and is threadedly connected to the ring sleeve (18).

3. The concrete axial tensile stress testing device according to claim 2 is characterized in that: The annular sleeve (18) is provided with an arc groove (24), a first arc plate (25) is slidably connected in the arc groove (24), a first threaded rod (19) is rotatably connected to the first arc plate (25), the first threaded rod (19) is sleeved on the outside of the second threaded rod (20) and extends out of the annular sleeve (18), the first threaded rod (19) is threadedly connected to the annular sleeve (18), a plurality of first springs (26) are fixedly connected at equal intervals on a side of the first arc plate (25) away from the first threaded rod (19), and one end of the first spring (26) away from the first arc plate (25) is fixedly connected to the second arc plate (27).

4. The concrete axial tensile stress testing device according to claim 3 is characterized in that: A plurality of protrusions (28) are fixedly connected to the inner side of the second arc-shaped plate (27), and the protrusions (28) are in contact with the sample (21).

5. The concrete axial tensile stress testing device according to claim 1, characterized in that: The protection component comprises a base (11) fixedly connected to the top surface of the test bench (1), a protection box (10) is fixedly connected to the top surface of the base (11), the sample (21) passes through the protection box (10), a flexible pad (29) is fixedly connected to the inner wall of the protection box (10), and monitoring components are installed on all four sides of the protection box (10).

6. The concrete axial tensile stress testing device according to claim 5, characterized in that: The monitoring component comprises a conical cylinder (30) fixedly connected to the inner wall of the protective box (10), an electric push rod (31) fixedly connected inside the conical cylinder (30), a high-definition camera (32) fixedly connected to the output end of the electric push rod (31), and the high-definition camera is directed toward the sample (21).

7. The concrete axial tensile stress testing device according to claim 1, characterized in that: The driving assembly comprises a connecting frame (9) fixedly connected to the top surface of the test bench (1), a jack (8) fixedly connected to the top of the connecting frame (9), a connecting plate (7) fixedly connected to the output end of the jack (8), and the tops of the two pressure plates (6) are respectively hinged to the connecting plates (7).

8. The concrete axial tensile stress testing device according to claim 2, characterized in that: The connecting assembly comprises a connecting column (13) fixedly connected to the side wall of the stretching plate (12); one end of the connecting column (13) away from the stretching plate (12) is fixedly connected to a first pull ring (14); the first pull ring (14) is fixedly sleeved with a second pull ring (15); the second pull ring (15) is detachably connected to an arc rod (16); both ends of the arc rod (16) are respectively fixedly connected to connecting blocks (17); the connecting block (17) is fixedly connected to the outer side of the ring sleeve (18).

9. The concrete axial tensile stress testing device according to claim 1, characterized in that: A connecting head (22) is symmetrically fixed to the bottom of the pressure plate (6), and the connecting head (22) is sleeved on the outside of the connecting shaft (23) and is rotatably connected to the connecting shaft (23).

10. The concrete axial tensile stress testing device according to claim 1, characterized in that: The groove (4) is symmetrically provided with a slide groove (5), both ends of the connecting shaft (23) extend into the slide groove (5) and are slidably connected to the slide groove (5), one end of a second spring (33) is fixedly connected to the side of the slide groove (5) away from the connecting shaft (23), and the other end of the second spring (33) is fixedly connected to a sliding plate (36), the sliding plate (36) is slidably connected to the slide groove (5), and limiting rods (35) are symmetrically fixedly connected to both sides of the sliding plate (36), and limiting grooves (34) are symmetrically provided in the slide groove (5), and the limiting rods (35) are located in the limiting groove (34) and are slidably connected to the limiting groove (34).

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