Steel bar multi-dimensional mechanical property detection device for constructional engineering

Abstract

The invention relates to the technical field of constructional engineering material performance detection, in particular to a steel bar multi-dimensional mechanical performance detection device for constructional engineering, which comprises a base and a rack welded at the top of the base, a fixed seat and a movable seat are respectively bolted and slidably connected in the rack, and the movable seat is located on the rear side of the fixed seat. The front side of the bottom of the moving seat is in bolted connection with a hydraulic cylinder, the other end of the hydraulic cylinder is in bolted connection with the rack, a performance detection mechanism is arranged in the rack, and the performance detection mechanism is used in cooperation with the moving seat; the performance detection mechanism comprises two sleeves which are installed in the movable base and the fixed base respectively, the tops and the bottoms of the interiors of the two sleeves are provided with a movable block and a fixed block respectively, and the opposite sides of the movable block and the fixed block are connected with clamping blocks in a bolted mode. The reinforcing steel bar multi-dimensional mechanical property detection device for constructional engineering has the advantage that multi-dimensional mechanical property detection can be performed on the same reinforcing steel bar sample.

Description

Technical Field

[0001] This invention relates to the field of performance testing technology for building materials, specifically a device for testing the multi-dimensional mechanical properties of reinforcing steel bars in building engineering. Background Technology

[0002] As is well known, in the field of construction engineering, steel bars, as core load-bearing components, directly determine the safety, stability, and durability of building structures through their mechanical properties, making them a key link in ensuring project quality. The mechanical property testing of steel bars needs to cover multiple dimensions of indicators, including tensile strength, torsional strength, and bending strength. The compliance of various performance indicators directly affects the building structure's ability to resist damage under long-term use and loads. Therefore, the mechanical property testing of steel bars is one of the core procedures for raw material inspection before construction, quality control during construction, and project acceptance.

[0003] Currently, the industry generally uses specialized testing equipment to perform the above tests, such as using a universal testing machine for tensile testing, a bending testing machine for bending mandrel testing, and a torsion testing machine for torsion testing.

[0004] This discrete testing method has many shortcomings: First, when testing different properties, it is necessary to change equipment and re-clamp the samples, which is cumbersome and inefficient. Second, since the samples used for each test are not from the same section, even if they are taken from the same steel bar, the slight inhomogeneity of the material itself will make it impossible to accurately correlate and compare the test data, making it difficult to comprehensively and realistically reflect the comprehensive performance of the steel bar under complex multidimensional stress states. In addition, discrete testing is difficult to simulate the combined stress state of steel bars in actual engineering structures, which may be subjected to tension, bending, or even torsion at the same time, and is difficult to adapt to the needs of comprehensive mechanical performance testing of steel bars in construction engineering. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a multi-dimensional mechanical property testing device for reinforcing bars in construction engineering, which has the advantage of being able to perform multi-dimensional mechanical property testing on the same reinforcing bar sample.

[0007] (II) Technical Solution

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a multi-dimensional mechanical performance testing device for steel bars in construction engineering, comprising a base and a frame welded to its top, wherein a fixed seat and a movable seat are respectively bolted and slidably connected inside the frame, and the movable seat is located behind the fixed seat; a hydraulic cylinder is bolted to the front side of the bottom of the movable seat, and the other end of the hydraulic cylinder is bolted to the frame; a performance testing mechanism is provided inside the frame, and the performance testing mechanism is used in conjunction with the movable seat.

[0009] The performance testing mechanism includes two sleeves installed inside the movable seat and the fixed seat respectively. The top and bottom of the two sleeves are respectively provided with a movable block and a fixed block. Each movable block and the fixed block are bolted with a clamping block on the opposite side. A steel bar is clamped between two adjacent clamping blocks. Two anti-loosening components are provided on the rear side inside the frame. A torsion component is fixedly fitted on the surface of the rear anti-loosening component, and the torsion component is used in conjunction with the movable seat.

[0010] By adopting the above technical solution, a performance testing mechanism is set up, and a hydraulic cylinder drives the moving seat to generate linear motion. The sliding of the moving seat is used to achieve synchronous driving of torsional resistance testing, and the tensile and torsional performance is tested in a coordinated manner. This can simulate the composite stress state of steel bars in actual engineering. Furthermore, the double fixation by the anti-loosening component and the clamping structure effectively prevents the steel bars from sliding or slipping during high-load tensile and torsional resistance testing, ensuring the stability of the testing process. At the same time, it avoids the distortion of test data caused by sliding and improves the testing accuracy.

[0011] The invention is further configured such that: a support plate is bolted to the top of both the movable seat and the fixed seat, and a rotating shaft is rotatably connected inside the support plate; a pressing cam is bolted to the opposite end of each of the two rotating shafts, and the bottom of the pressing cam contacts the movable block.

[0012] Using the above technical solution, by rotating the rotating shaft, the rotating shaft rotates within the support plate and drives the pressure cam to rotate synchronously. Since the bottom of the pressure cam contacts the movable block, as the pressure cam rotates, the protruding part of the pressure cam gradually squeezes the movable block, pushing the movable block to move downward along the slide rod. The movable block drives the clamping block at the top to move downward synchronously, cooperating with the clamping block on the fixed block to gradually clamp the steel bar to be tested. When the steel bar is clamped to a suitable state, the rotating shaft is stopped. At this time, the protruding part of the pressure cam continues to press against the movable block, keeping the movable block in a fixed state, thus achieving stable clamping of the steel bar and ensuring that the sample will not slip at the clamping end when subjected to huge tensile force and torque.

[0013] The invention is further configured such that: both ends of the surface of the rotating shaft are threaded with fastening nuts, and the fastening nuts are in close contact with the side of the support plate; and a rotating handle is welded to the right side of the rotating shaft.

[0014] By adopting the above technical solution, the position of the rotating shaft can be accurately fixed by tightening the nut and the threaded engagement of the rotating shaft, preventing the rotating shaft from loosening or rotating after clamping, avoiding the loosening of the steel bar clamping caused by the displacement of the movable block, and ensuring the stability of the clamping.

[0015] The present invention is further configured such that: both ends of the movable block and the fixed block are welded with connecting protrusions, a sliding rod passes through the interior of the two connecting protrusions at the top and bottom, and both ends of the sliding rod are bolted to the inner wall of the sleeve; a return spring is sleeved on the surface of the sliding rod, and both ends of the return spring are connected to the connecting protrusions.

[0016] By adopting the above technical solution, the sliding rod and the connecting protrusion cooperate to precisely guide the movement direction of the movable block, ensuring that the movable block always moves in the vertical direction, avoiding deviation or tilting during the movement of the movable block, thereby ensuring the fit between the clamping block and the steel bar and avoiding detection errors caused by clamping eccentricity; by setting a reset spring, the movable block can be automatically reset, improving detection efficiency.

[0017] The present invention is further configured such that: the torsion assembly includes a sleeve, the sleeve being fitted onto the surface of the rear anti-loosening assembly; a ring frame is rotatably connected inside the sleeve; the inner side of the ring frame is fixedly connected to the rear anti-loosening assembly; an end face gear is bolted to the front side of the outer side of the ring frame; a connecting shaft is rotatably connected to the right side inside the sleeve; a driving gear and a driven gear are respectively bolted to both ends of the connecting shaft; the driven gear is located inside the sleeve and meshes with the end face gear; the driving gear is located on the right side of the sleeve, and a toothed plate is meshed with the bottom of the driving gear; a connecting plate is welded to the front side of the toothed plate; and the front end of the connecting plate is bolted to the movable seat.

[0018] By adopting the above technical solution, and by setting up a torsion component, when the hydraulic cylinder drives the moving seat to slide inside the frame, the moving seat drives the connecting plate to move synchronously. The connecting plate drives the toothed plate to slide horizontally along the limiting plate. Through the meshing of the toothed plate and the driving gear, the toothed plate drives the driving gear to rotate when it slides. The driving gear drives the connecting shaft to rotate synchronously. The connecting shaft drives the driven gear at the other end to rotate. The driven gear meshes with the end face gear on the outer side of the ring frame. When the driven gear rotates, it drives the end face gear to rotate synchronously, which in turn drives the ring frame to rotate inside the housing. Since the inner side of the ring frame is fixedly connected to the rear anti-loosening component, when the ring frame rotates, it drives the rear anti-loosening component to rotate synchronously. The rear anti-loosening component drives the clamped steel bar to rotate synchronously. The linear displacement of the moving seat is directly and linearly converted into the rotation angle (torsion angle) of one end of the sample, thereby realizing the simultaneous detection of the tensile and torsional properties of the steel bar, which can simulate the composite stress state of the steel bar in actual engineering.

[0019] The present invention is further configured such that: a sliding protrusion integral with the bottom of the toothed plate is provided, a limiting plate is slidably connected to the bottom of the sliding protrusion, and the rear end of the limiting plate is bolted to the inner wall of the frame.

[0020] By adopting the above technical solution, the sliding direction of the toothed plate is precisely guided and limited by the cooperation of the sliding protrusion and the limiting plate, ensuring that the toothed plate always slides smoothly in the horizontal direction, avoiding tilting or deviation when the toothed plate slides, and ensuring the meshing accuracy between the toothed plate and the driving gear.

[0021] The present invention is further configured such that: the anti-loosening component includes a fixing cylinder, the inner wall of the fixing cylinder is conical, and a plurality of wedge blocks are slidably arranged in an annular manner inside the fixing cylinder. An anti-torsion block is provided on the inner side of the wedge block, the inner side of the anti-torsion block is in close contact with the reinforcing bar, and the inner side of the anti-torsion block is provided with anti-slip teeth. An elastic hoop is embedded around the interior of the plurality of anti-torsion blocks. Two telescopic rods are bolted between adjacent anti-torsion blocks and wedge blocks. A compression spring is sleeved on the surface of the telescopic rod, and the two ends of the compression spring abut against the inner walls of the wedge block and the anti-torsion block, respectively. A limiting protrusion is fixedly connected to the outer side of the wedge block, and the surface of the limiting protrusion slides in contact with the inner wall of the fixing cylinder.

[0022] By adopting the above technical solution, and by setting anti-loosening components, the reinforcing bar is passed through the fixing cylinder of two anti-loosening components. In the initial state, several anti-torsion blocks clamp the reinforcing bar under the contraction action of the elastic hoop, so that the anti-torsion blocks are always in close contact with the reinforcing bar. The anti-slip teeth on the inner side of the anti-torsion block are in close contact with the surface of the reinforcing bar, increasing the friction between the anti-torsion block and the reinforcing bar. At the same time, the compression spring on the surface of the telescopic rod applies an elastic force, pushing the anti-torsion block into close contact with the reinforcing bar. Furthermore, since the inside of the fixing cylinder is conical, when the reinforcing bar is subjected to tension during the tensile test, it will have an outward stretching tendency. At this time, the wedge block slides further outward along the inner wall of the cone under the action of tension, further increasing the compressive force. The clamping force of the anti-torsion block on the reinforcing bar increases simultaneously, achieving the anti-loosening effect of "the more it is pulled, the tighter it becomes", thereby avoiding relative sliding between the anti-torsion block and the reinforcing bar and ensuring the effective transmission of torsional force.

[0023] The present invention is further configured such that: a first fixing frame is bolted to the bottom and top of the front fixing cylinder, a fixing ring is rotatably sleeved on the surface of the rear fixing cylinder, and a second fixing frame is bolted to both sides of the fixing ring; the first fixing frame and the second fixing frame are both bolted to the frame on the side near the inner wall of the frame.

[0024] By adopting the above technical solution, the front and rear anti-loosening components are fixed by the first and second fixing frames respectively, ensuring the accurate installation position of the two anti-loosening components and the coaxiality of the two anti-loosening components and the rebar, avoiding the rebar clamping eccentricity caused by the offset of the anti-loosening components, and improving the detection accuracy. The rear anti-loosening component is rotatably connected to the fixing ring, and the fixing ring is bolted to the frame through the second fixing frame. This not only realizes the fixed installation of the rear anti-loosening component, but also does not affect the rotation of the rear anti-loosening component, ensuring the smooth progress of the torsional test.

[0025] The present invention is further configured such that: the performance testing mechanism further includes a bending strength testing mechanism, the bending strength testing mechanism includes a support plate, a bracket is provided on the front side of the support plate, the support plate and the bracket are both fitted onto the surface of the reinforcing bar, and the support plate is bolted to the fixed seat, the top and bottom of the bracket are provided with bending rollers, and the side of the bending rollers closest to the reinforcing bar is in close contact with the reinforcing bar, the top of the movable seat is bolted to a fixed plate, the top of the fixed plate is bolted to several clamping plates, the front clamping plate is provided with a clamping rod, and a connecting cable is fixedly connected to the middle of the clamping rod, the other end of the connecting cable is rotatably connected to a fixing collar, and the fixing collar is fixedly fitted onto the front end of the reinforcing bar.

[0026] By adopting the above technical solution, a bending strength testing mechanism is set up. After the reinforcing bar is clamped and fixed by the clamping blocks and anti-loosening components of the performance testing mechanism, the position of the bracket is adjusted according to the bending test requirements of the reinforcing bar, so that the bending mandrel pressure roller is in the preset bending position of the reinforcing bar. Then, the fixing collar is fixedly fitted on the front end of the reinforcing bar, and the clamping rod is clamped into the corresponding clamping plate on the top of the fixing plate. Through the cooperation of the clamping plate and the clamping rod, the length and angle of the connecting cable can be adjusted, thereby adjusting the bending angle of the reinforcing bar to achieve the detection of different bending degrees. When the hydraulic cylinder drives the moving seat to slide, the moving seat drives the fixing plate, clamping rod and connecting cable to move synchronously. At the same time, the bending mandrel pressure roller plays a limiting role on the bending mandrel of the reinforcing bar. Under the tension of the connecting cable, the reinforcing bar gradually bends and deforms with the bending mandrel pressure roller as the fulcrum. By observing the bending state of the reinforcing bar and recording the stress during the bending process, the bending strength of the reinforcing bar can be detected. By seamlessly converting the main tensile power into bending load, the synchronous tensile and bending composite test is realized, thereby simulating more complex engineering stress states.

[0027] The present invention is further configured such that: two connecting brackets are bolted to the rear side of the support plate, and the rear side of the connecting brackets is bolted to the fixed seat; support rods are bolted to both ends of the front side of the support plate; the front end of the support rod is rotatably sleeved with an internal threaded sleeve; the internal thread of the internal threaded sleeve is connected to an adjusting stud, and the front end of the adjusting stud is bolted to the bracket.

[0028] By adopting the above technical solution, by rotating the internal threaded sleeve and utilizing the threaded engagement between the internal threaded sleeve and the adjusting stud, the length of the adjusting stud extending out of the internal threaded sleeve can be adjusted, thereby driving the bracket to move back and forth along the direction of the support rod. This allows for adjustment of the relative distance between the two bending mandrel pressure rollers and the support plate, thus changing the position of the bending fulcrum (bending mandrel) to adapt to steel bars of different specifications and bending requirements.

[0029] (III) Beneficial Effects

[0030] Compared with the prior art, the present invention provides a multi-dimensional mechanical performance testing device for steel bars in construction engineering, which has the following beneficial effects:

[0031] This multi-dimensional mechanical performance testing device for steel bars used in construction engineering, through the setting of a performance testing mechanism, uses a hydraulic cylinder to drive a moving seat to generate linear motion. The sliding of the moving seat is used to achieve synchronous driving of torsional resistance testing, and at the same time realizes the joint testing of tensile and torsional properties. It can simulate the composite stress state of steel bars in actual engineering. Furthermore, through the double fixation of anti-loosening components and clamping structure, it effectively avoids the slippage and detachment of steel bars during high-load tensile and torsional resistance testing, ensuring the stability of the testing process, avoiding the distortion of test data caused by slippage, and improving the testing accuracy.

[0032] By setting up a bending strength testing mechanism, and by setting an adjustable bending mandrel support at a specific position on the sample, and by using a traction structure, the hydraulic cylinder drives the moving seat to perform tension while simultaneously causing the sample to bend around the bending mandrel. This design realizes synchronous composite loading testing, which can simulate the complex working conditions of steel bars subjected to combined tension and bending in actual engineering. Compared with the traditional independent bending test method, it can form a complete multi-dimensional performance test with tension and torsion tests, and can comprehensively and realistically reflect the comprehensive mechanical properties of steel bars. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic diagram showing the connection between the movable seat and the performance testing mechanism in this invention;

[0035] Figure 3 This is a schematic diagram showing the connection between the sleeve, the movable block, and the fixed block in this invention;

[0036] Figure 4 This is a schematic diagram of the torsion component structure in this invention;

[0037] Figure 5 This is a schematic diagram of the anti-loosening component structure in this invention;

[0038] Figure 6This is a schematic diagram showing the connection between the movable seat and the bending strength detection mechanism in this invention;

[0039] Figure 7 This is a schematic diagram of the connection between the support plate and the bracket in this invention.

[0040] In the diagram: 1. Base; 2. Frame; 3. Moving seat; 4. Hydraulic cylinder; 5. Performance testing mechanism; 51. Sleeve; 52. Movable block; 53. Fixed block; 54. Clamping block; 55. Anti-loosening component; 551. Fixed cylinder; 552. Wedge block; 553. Anti-torsion block; 554. Elastic hoop; 555. Telescopic rod; 556. Compression spring; 557. Limiting protrusion; 56. Torsion component; 561. Housing; 562. Ring frame; 563. End face gear; 564. Connecting shaft; 565. Driving gear; 566. Driven gear; 567. Gear plate 568. Connecting plate; 6. Bending strength testing mechanism; 61. Support plate; 62. Bracket; 63. Bending roller; 64. Fixing plate; 65. Clamping plate; 66. Clamping rod; 67. Connecting cable; 68. Fixing collar; 7. Support plate; 8. Rotating shaft; 9. Pressing cam; 10. Fastening nut; 11. Connecting protrusion; 12. Slide rod; 13. Return spring; 14. Limiting plate; 15. First fixing frame; 16. Fixing ring; 17. Second fixing frame; 18. Connecting frame; 19. Support rod; 20. Internal threaded sleeve; 21. Adjusting stud; 22. Fixing seat. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] Please see Figure 1-5 A multi-dimensional mechanical performance testing device for steel bars used in construction engineering includes a base 1 and a frame 2 welded to its top. A fixed seat 22 and a movable seat 3 are bolted and slidably connected inside the frame 2, and the movable seat 3 is located behind the fixed seat 22. A hydraulic cylinder 4 is bolted to the front side of the bottom of the movable seat 3, and the other end of the hydraulic cylinder 4 is bolted to the frame 2. A performance testing mechanism 5 is provided inside the frame 2, and the performance testing mechanism 5 is used in conjunction with the movable seat 3.

[0044] The performance testing mechanism 5 includes two sleeves 51 installed inside the movable seat 3 and the fixed seat 22, respectively. Movable blocks 52 and fixed blocks 53 are respectively installed at the top and bottom of the two sleeves 51. Clamping blocks 54 are bolted to the opposite side of each movable block 52 and fixed block 53. Reinforcing bars are clamped between adjacent clamping blocks 54. Two anti-loosening components 55 are installed on the rear side of the frame 2. Torsion components 56 are fixedly fitted onto the surface of the rear anti-loosening components 55 and work in conjunction with the movable seat 3. By setting up the performance testing mechanism 5, the movable seat 3 is driven to move linearly by the hydraulic cylinder 4. The sliding of the movable seat 3 achieves synchronous driving of the torsional resistance test, simultaneously realizing the coordinated testing of tensile and torsional properties. This can simulate the composite stress state of reinforcing bars in actual engineering projects. Furthermore, the double fixation by the anti-loosening components 55 and the clamping structure effectively prevents the reinforcing bars from sliding or slipping during high-load tensile and torsional resistance testing, ensuring the stability of the testing process and avoiding data distortion caused by sliding, thus improving testing accuracy.

[0045] The top of both the movable seat 3 and the fixed seat 22 is bolted with a support plate 7. The inside of the support plate 7 is rotatably connected to a rotating shaft 8. The opposite ends of the two rotating shafts 8 are bolted with a pressing cam 9, and the bottom of the pressing cam 9 contacts the movable block 52. By rotating the rotating shaft 8, the rotating shaft 8 rotates inside the support plate 7 and drives the pressing cam 9 to rotate synchronously. Since the bottom of the pressing cam 9 contacts the movable block 52, as the pressing cam 9 rotates, the protruding part of the pressing cam 9 gradually squeezes the movable block 52, pushing the movable block 52 to move downward along the slide rod 12. The movable block 52 drives the clamping block 54 at the top to move downward synchronously, cooperating with the clamping block 54 on the fixed block 53 to gradually clamp the steel bar to be tested. When the steel bar is clamped to a suitable state, the rotating shaft 8 is stopped. At this time, the protruding part of the pressing cam 9 continues to press against the movable block 52, keeping the movable block 52 in a fixed state, realizing the stable clamping of the steel bar, and ensuring that the sample will not slip at the clamping end when subjected to huge tensile force and torque.

[0046] Both ends of the rotating shaft 8 are threaded with fastening nuts 10, and the fastening nuts 10 are in close contact with the side of the support plate 7. A rotating handle is welded to the right side of the rotating shaft 8. The position of the rotating shaft 8 can be accurately fixed by the threaded engagement of the fastening nuts 10 and the rotating shaft 8, preventing the rotating shaft 8 from loosening or rotating after clamping, avoiding the loosening of the steel bar clamping caused by the displacement of the movable block 52, and ensuring the stability of the clamping.

[0047] Both ends of the movable block 52 and the fixed block 53 are welded with connecting protrusions 11. A slide rod 12 passes through the interior of the two connecting protrusions 11 at the top and bottom, and both ends of the slide rod 12 are bolted to the inner wall of the sleeve 51. A return spring 13 is sleeved on the surface of the slide rod 12, and both ends of the return spring 13 are connected to the connecting protrusions 11. Through the cooperation between the slide rod 12 and the connecting protrusions 11, the movement direction of the movable block 52 is precisely guided, ensuring that the movable block 52 always moves in a vertical direction, avoiding deviation or tilting of the movable block 52 during movement, thereby ensuring the fit between the clamping block 54 and the reinforcing bar, and avoiding detection errors caused by clamping eccentricity. The setting of the return spring 13 realizes the automatic reset of the movable block 52, improving the detection efficiency.

[0048] The torsion assembly 56 includes a housing 561, which is fitted onto the surface of the rear anti-loosening assembly 55. A ring frame 562 is rotatably connected inside the housing 561. The inner side of the ring frame 562 is fixedly connected to the rear anti-loosening assembly 55. An end face gear 563 is bolted to the front side of the outer side of the ring frame 562. A connecting shaft 564 is rotatably connected to the right side inside the housing 561. A driving gear 565 and a driven gear 566 are respectively bolted to both ends of the connecting shaft 564. 566 is located inside the housing 561 and meshes with the end face gear 563. The drive gear 565 is located on the right side of the housing 561, and the bottom of the drive gear 565 is meshed with a toothed plate 567. A connecting plate 568 is welded to the front side of the toothed plate 567. The front end of the connecting plate 568 is bolted to the movable seat 3. By setting the torsion assembly 56, when the hydraulic cylinder 4 drives the movable seat 3 to slide inside the frame 2, the movable seat 3 drives the connecting plate 568 to move synchronously. 68 drives the toothed plate 567 to slide horizontally along the limiting plate 14. Through the meshing of the toothed plate 567 and the driving gear 565, the toothed plate 567 drives the driving gear 565 to rotate when it slides. The driving gear 565 drives the connecting shaft 564 to rotate synchronously. The connecting shaft 564 drives the driven gear 566 at the other end to rotate. The driven gear 566 meshes with the end face gear 563 on the outer side of the ring frame 562. When the driven gear 566 rotates, it drives the end face gear 563 to rotate synchronously, which in turn drives the ring frame 562 to rotate inside the housing 561. Since the inner side of the ring frame 562 is fixedly connected to the rear anti-loosening component 55, when the ring frame 562 rotates, it drives the rear anti-loosening component 55 to rotate synchronously. The rear anti-loosening component 55 drives the clamped steel bar to rotate synchronously. The linear displacement of the moving seat 3 is directly and linearly converted into the rotation angle (torsion angle) of one end of the sample, thereby realizing the synchronous detection of the tensile and torsional properties of the steel bar, which can simulate the composite stress state of the steel bar in actual engineering.

[0049] The toothed plate 567 has an integral sliding protrusion at its bottom. The bottom of the sliding protrusion is slidably connected to the limiting plate 14, and the rear end of the limiting plate 14 is bolted to the inner wall of the frame 2. Through the cooperation of the sliding protrusion and the limiting plate 14, the sliding direction of the toothed plate 567 is precisely guided and limited, ensuring that the toothed plate 567 always slides smoothly in the horizontal direction, avoiding tilting or deviation when the toothed plate 567 slides, and ensuring the meshing accuracy between the toothed plate 567 and the drive gear 565.

[0050] The anti-loosening component 55 includes a fixing cylinder 551, the inner wall of which is conical. Several wedge-shaped blocks 552 are slidably arranged in a ring inside the fixing cylinder 551. Anti-torsion blocks 553 are provided on the inner side of each wedge-shaped block 552, and their inner sides are in close contact with the reinforcing bar. The inner sides of the anti-torsion blocks 553 are provided with anti-slip teeth. Elastic hoop rings 554 are embedded around the interiors of the anti-torsion blocks 553. Two telescopic rods 555 are bolted between adjacent anti-torsion blocks 553 and wedge-shaped blocks 552. A compression spring 556 is sleeved on the surface of each telescopic rod 555, and both ends of the compression spring 556 abut against the inner walls of the wedge-shaped blocks 552 and the anti-torsion blocks 553, respectively. A limiting protrusion 557 is fixedly connected to the outer side of each wedge-shaped block 552, and the surface of the limiting protrusion 557 slides in contact with the inner wall of the fixing cylinder 551. By setting the anti-loosening component 55, the reinforcing bar can pass through the two anti-loosening components 552. In the initial state, the fixed cylinder 551 of component 5 has several anti-torsion blocks 553 that grip the reinforcing bar under the contraction action of the elastic hoop 554, ensuring that the anti-torsion blocks 553 are always in close contact with the reinforcing bar. The anti-slip teeth on the inner side of the anti-torsion blocks 553 are in close contact with the surface of the reinforcing bar, increasing the friction between the anti-torsion blocks 553 and the reinforcing bar. At the same time, the compression spring 556 on the surface of the telescopic rod 555 applies an elastic force, pushing the anti-torsion blocks 553 into close contact with the reinforcing bar. Furthermore, since the inside of the fixed cylinder 551 is conical, when the reinforcing bar is subjected to tension during the tensile test, it will tend to stretch outward. At this time, the wedge block 552 will slide further outward along the inner wall of the cone under the action of the tension, further increasing the squeezing force. The clamping force of the anti-torsion blocks 553 on the reinforcing bar will increase simultaneously, achieving the anti-loosening effect of "the more it is pulled, the tighter it becomes", thereby avoiding relative sliding between the anti-torsion blocks 553 and the reinforcing bar and ensuring the effective transmission of torsional force.

[0051] The front fixing cylinder 551 has a first fixing bracket 15 bolted to its bottom and top. The rear fixing cylinder 551 has a fixing ring 16 rotatably sleeved on its surface, and a second fixing bracket 17 is bolted to both sides of the fixing ring 16. The first fixing bracket 15 and the second fixing bracket 17 are both bolted to the machine frame 2 on the side closest to the inner wall of the machine frame 2. The first fixing bracket 15 and the second fixing bracket 17 fix the front and rear anti-loosening components 55 respectively, ensuring the accurate installation position of the two anti-loosening components 55, ensuring the coaxiality of the two anti-loosening components 55 and the rebar, avoiding the rebar clamping eccentricity caused by the offset of the anti-loosening components 55, and improving the detection accuracy. The rear anti-loosening component 55 is rotatably connected to the fixing ring 16, and the fixing ring 16 is bolted to the machine frame 2 through the second fixing bracket 17. This not only achieves the fixed installation of the rear anti-loosening component 55, but also does not affect the rotation of the rear anti-loosening component 55, ensuring the smooth progress of the torsional test.

[0052] The working principle of this embodiment is as follows: The reinforcing bar is passed through the front sleeve 51 and the two rear anti-loosening components 55. By rotating the handle, the camshaft is driven, causing the pressing cam 9 to press down the movable block 52, thereby closing the upper and lower clamping blocks 54 and firmly clamping the front end of the reinforcing bar in the moving seat 3. Then, the hydraulic cylinder 4 is activated, and its piston rod drives the moving seat 3 to slide backward along the frame 2. Since the front end of the reinforcing bar is constrained by the front movable block 52 and the clamping block 54 of the fixed block 53 bracket 62, when the moving seat 3 moves backward, the rear clamping block 54 applies an axial tensile force to the reinforcing bar, thereby completing the loading and testing of tensile properties. At the same time, the linear motion of the moving seat 3 is transmitted to the toothed plate 567 through the connecting plate 568. The translation of the toothed plate 567 drives the driving gear 565 that meshes with it to rotate. This rotational motion is transmitted through the connecting shaft 564 and the driven gear 566 to the end face gear 563 fixed to the rear anti-loosening component 55, and finally converted into the anti-loosening component 55 and the rear end of the reinforcing bar. The rotation of the moving seat 3 linearly and accurately converts the linear displacement of the sample into the torsional angle of the sample, thus realizing the application of torsional load. To ensure effective power transmission without slippage under high load, the wedge block 552 and the anti-torsion block 553 in the conical cavity inside the fixed cylinder 551 form an adaptive clamping unit. When the steel bar is under tension or has a torsional tendency, its tendency to slip outward forces the wedge block 552 to slide along the conical wall, generating a radial tightening wedge effect. This allows the anti-torsion block 553 to grip the steel bar more tightly with the assistance of the compression spring 556, and the inner anti-slip teeth bite into the surface, forming a self-locking state of "tightening with tension and tightening with torsion", which can prevent the steel bar from slipping or torturing. The performance testing mechanism 5 can complete the testing of two basic properties in a single clamping, ensuring that the data comes from the same section of the sample, greatly improving the testing efficiency and data correlation value, and better simulating the tensile and torsional combined stress state that the steel bar may encounter in actual engineering.

[0053] Example 2

[0054] refer to Figure 6-7 A multi-dimensional mechanical performance testing device for reinforcing bars used in construction engineering also includes a bending strength testing mechanism 6. The bending strength testing mechanism 6 includes a support plate 61, with a bracket 62 mounted on the front side of the support plate 61. Both the support plate 61 and the bracket 62 are fitted onto the surface of the reinforcing bar, and the support plate 61 is bolted to a fixed seat 22. Bending rollers 63 are mounted at the top and bottom inside the bracket 62, with the side of the bending rollers 63 in close contact with the reinforcing bar. A fixed plate 64 is bolted to the top of the movable seat 3, and several clamping plates 65 are bolted to the top of the fixed plate 64. A clamping rod 66 is mounted inside the front clamping plate 65, and a connecting cable 67 is fixedly connected to the middle of the clamping rod 66. The other end of the connecting cable 67 is rotatably connected to a fixing collar 68, which is fixedly fitted onto the front end of the reinforcing bar. By setting up the bending strength testing mechanism 6, when the reinforcing bar is clamped and fixed by the clamping block 54 and anti-loosening component 55 of the performance testing mechanism 5, and based on the bending strength test of the reinforcing bar... To test the requirements, the position of the bracket 62 is adjusted so that the bending mandrel roller 63 is in the preset bending position of the rebar. Then, the fixing collar 68 is fixedly fitted onto the front end of the rebar, and the clamping rod 66 is clamped into the corresponding clamping plate 65 on the top of the fixing plate 64. Through the cooperation of the clamping plate 65 and the clamping rod 66, the length and angle of the connecting cable 67 can be adjusted, thereby adjusting the bending angle of the rebar and realizing the detection of different degrees of bending. When the hydraulic cylinder 4 drives the moving seat 3 to slide, the moving seat 3 drives the fixing plate 64, the clamping rod 66 and the connecting cable 67 to move synchronously. At the same time, the bending mandrel roller 63 plays a limiting role on the bending mandrel of the rebar. Under the tension of the connecting cable 67, the rebar gradually bends and deforms with the bending mandrel roller 63 as the fulcrum. By observing the bending state of the rebar and recording the stress during the bending process, the bending strength of the rebar can be detected. By seamlessly converting the main tensile power into bending load, the synchronous tensile and bending composite test is realized, thereby simulating more complex engineering stress states.

[0055] Two connecting brackets 18 are bolted to the rear side of the support plate 61, and the rear side of the connecting brackets 18 is bolted to the fixed seat 22. Support rods 19 are bolted to both ends of the front side of the support plate 61. The front end of the support rod 19 is rotatably sleeved with an internal threaded sleeve 20. The internal thread of the internal threaded sleeve 20 is connected to an adjusting stud 21, and the front end of the adjusting stud 21 is bolted to the bracket 62. By rotating the internal threaded sleeve 20, the length of the adjusting stud 21 extending out of the internal threaded sleeve 20 can be adjusted by utilizing the threaded engagement between the internal threaded sleeve 20 and the adjusting stud 21. This drives the bracket 62 to move back and forth along the direction of the support rod 19, which can adjust the relative distance between the two bending mandrel rollers 63 and the support plate 61, that is, change the position of the bending fulcrum (bending mandrel), and adapt to steel bars of different specifications and different bending requirements.

[0056] The working principle of this embodiment is as follows: The extension length of the stud 21 is adjusted by rotating the internal threaded sleeve 20, thereby driving the bracket 62 and its upper and lower bending mandrel rollers 63 to move back and forth along the axial direction of the reinforcing bar. This adjustment function allows the bending fulcrum (i.e., the bending mandrel) to be precisely set at any desired position along the length of the sample to adapt to bending gauge lengths under different standards or research requirements. After adjustment, the bending mandrel rollers 63 clamp the reinforcing bar from both sides via a hydraulic drive structure, forming a stable bending fulcrum. Then, the fixing collar 68 is tightly fitted onto the front end of the reinforcing bar, and according to the target bending angle, the clamping rod 66 at the other end of the connecting cable 67 is inserted into the corresponding clamping plate 65 on the fixing plate 64. When the hydraulic cylinder 4 drives the moving seat 3 to move backward for tensile testing, the moving seat... The fixed plate 64 of the 3-fixed connection moves backward synchronously. The fixed plate 64 applies a tensile force to the front end of the steel bar through the clamp 66 and the connecting cable 67. Since the middle part of the steel bar is limited by the bending mandrel 63, the tensile force forces the steel bar to bend and deform with the bending mandrel 63 as the fulcrum. As the tensile displacement continues to increase, the bending angle of the steel bar also increases, thus realizing the synchronous application of tensile load and bending deformation. In this process, the behavior of the steel bar under tensile-bending combined stress can be evaluated by observing and recording the force value on the device and the bending shape of the sample. The bending strength testing mechanism 6 realizes the simulation of complex combined loading conditions, providing a direct and efficient experimental means for studying the mechanical properties of steel bars that are simultaneously subjected to tensile force and bending moment in actual engineering parts such as beam and column joints.

[0057] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. Those skilled in the art can make modifications to this embodiment without contributing any inventive step after reading this specification. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-dimensional mechanical performance testing device for reinforcing bars in construction engineering, comprising a base (1) and a frame (2) welded to its top, characterized in that: The frame (2) is bolted and slidably connected to a fixed seat (22) and a movable seat (3), respectively. The movable seat (3) is located behind the fixed seat (22). A hydraulic cylinder (4) is bolted to the front side of the bottom of the movable seat (3), and the other end of the hydraulic cylinder (4) is bolted to the frame (2). A performance testing mechanism (5) is provided inside the frame (2), and the performance testing mechanism (5) is used in conjunction with the movable seat (3). The performance testing mechanism (5) includes two sleeves (51) installed inside the movable seat (3) and the fixed seat (22) respectively. The top and bottom of the two sleeves (51) are respectively provided with movable blocks (52) and fixed blocks (53). The movable blocks (52) and the fixed blocks (53) are each bolted with clamping blocks (54) on the opposite side. A steel bar is clamped between two adjacent clamping blocks (54). Two anti-loosening components (55) are provided on the rear side inside the frame (2). A torsion component (56) is fixedly fitted on the surface of the rear anti-loosening component (55), and the torsion component (56) is used in conjunction with the movable seat (3).

2. The multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 1, characterized in that: The top of the movable seat (3) and the fixed seat (22) are both bolted with a support plate (7). The support plate (7) is rotatably connected to a rotating shaft (8). The opposite ends of the two rotating shafts (8) are bolted with a pressing cam (9), and the bottom of the pressing cam (9) contacts the movable block (52).

3. The multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 2, characterized in that: Both ends of the rotating shaft (8) are threaded with fastening nuts (10), and the fastening nuts (10) are in close contact with the side of the support plate (7). A rotating handle is welded to the right side of the rotating shaft (8).

4. The multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 1, characterized in that: Both ends of the movable block (52) and the fixed block (53) are welded with connecting protrusions (11). A slide rod (12) runs through the interior of the two connecting protrusions (11) at the top and bottom. Both ends of the slide rod (12) are bolted to the inner wall of the sleeve (51). A return spring (13) is sleeved on the surface of the slide rod (12). Both ends of the return spring (13) are connected to the connecting protrusions (11).

5. The multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 1, characterized in that: The torsion assembly (56) includes a housing (561) that fits onto the surface of the rear anti-loosening assembly (55). A ring frame (562) is rotatably connected inside the housing (561). The inner side of the ring frame (562) is fixedly connected to the rear anti-loosening assembly (55). An end face gear (563) is bolted to the front side of the outer side of the ring frame (562). A connecting shaft (564) is rotatably connected to the right side inside the housing (561). The two ends are respectively bolted with a driving gear (565) and a driven gear (566). The driven gear (566) is inside the housing (561) and meshes with the end face gear (563). The driving gear (565) is located on the right side of the housing (561), and a toothed plate (567) is meshed with the bottom of the driving gear (565). A connecting plate (568) is welded to the front side of the toothed plate (567), and the front end of the connecting plate (568) is bolted to the moving seat (3).

6. A multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 5, characterized in that: The bottom of the toothed plate (567) is provided with an integral sliding protrusion, the bottom of which is slidably connected to a limiting plate (14), and the rear end of the limiting plate (14) is bolted to the inner wall of the frame (2).

7. The multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 1, characterized in that: The anti-loosening component (55) includes a fixing cylinder (551), the inner wall of which is conical, and several wedge-shaped blocks (552) are slidably arranged in a ring inside the fixing cylinder (551). Anti-twist blocks (553) are provided on the inner side of each wedge-shaped block (552), and the inner side of each anti-twist block (553) is in close contact with the reinforcing bar. Anti-slip teeth are provided on the inner side of each anti-twist block (553), and elastic hoop rings are embedded around the interior of each anti-twist block (553). 554), two telescopic rods (555) are bolted between adjacent anti-torsion blocks (553) and wedge blocks (552). The surface of the telescopic rods (555) is fitted with a compression spring (556), and the two ends of the compression spring (556) abut against the inner walls of the wedge blocks (552) and anti-torsion blocks (553) respectively. A limiting protrusion (557) is fixedly connected to the outer side of the wedge blocks (552), and the surface of the limiting protrusion (557) slides in contact with the inner wall of the fixed cylinder (551).

8. A multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 7, characterized in that: The bottom and top of the front fixing cylinder (551) are both bolted with a first fixing frame (15), and the surface of the rear fixing cylinder (551) is rotatably fitted with a fixing ring (16), and the two sides of the fixing ring (16) are both bolted with a second fixing frame (17). The first fixing frame (15) and the second fixing frame (17) are both bolted to the machine frame (2) on the side near the inner wall of the frame (2).

9. A multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 1, characterized in that: The performance testing mechanism (5) also includes a bending strength testing mechanism (6). The bending strength testing mechanism (6) includes a support plate (61). A bracket (62) is provided on the front side of the support plate (61). The support plate (61) and the bracket (62) are both fitted on the surface of the reinforcing bar. The support plate (61) is bolted to the fixed seat (22). The top and bottom of the bracket (62) are provided with bending rollers (63). The bending rollers (63) are in close contact with the side of the reinforcing bar. A fixed plate (64) is bolted to the top of the movable seat (3). Several clamping plates (65) are bolted to the top of the fixed plate (64). A clamping rod (66) is provided inside the front clamping plate (65). A connecting cable (67) is fixedly connected to the middle of the clamping rod (66). A fixed collar (68) is rotatably connected to the other end of the connecting cable (67). The fixed collar (68) is fixedly fitted to the front end of the reinforcing bar.

10. A multi-dimensional mechanical property testing device for reinforcing steel bars in construction engineering according to claim 9, characterized in that: Two connecting brackets (18) are bolted to the rear side of the support plate (61), and the rear side of the connecting brackets (18) is bolted to the fixed seat (22). Support rods (19) are bolted to both ends of the front side of the support plate (61). The front end of the support rod (19) is rotatably sleeved with an internal threaded sleeve (20). The internal thread of the internal threaded sleeve (20) is connected to an adjusting stud (21), and the front end of the adjusting stud (21) is bolted to the bracket (62).

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