Electro-hydraulic servo steel bar fatigue testing machine

Abstract

The utility model relates to the technical field of steel bar fatigue testing machines, in particular to an electro-hydraulic servo steel bar fatigue testing machine which is higher in speed and frequency of stretching and compressing a steel bar and improves the working efficiency of a test. Comprising a rack, an upper beam and a pressing hydraulic rod, the upper beam is slidably installed on the upper portion of the rack, the fixed end of the pressing hydraulic rod is installed on the rack, and a piston rod of the pressing hydraulic rod is connected with the upper beam; the upper clamping seat is rotationally installed on the upper beam, the gear motor is installed on the lower portion of the machine frame, the flywheel is concentrically installed on an output shaft of the gear motor, an installation groove is formed in the end face of the flywheel, the sliding block is installed in the installation groove of the flywheel, the sliding block and the flywheel are eccentric, and the lower clamping seat and the two clamping assemblies are arranged on the machine frame. The lower clamping base is rotationally installed on the sliding block, the lower clamping base and the upper clamping base are each provided with a clamping assembly, and the two clamping assemblies clamp the upper end and the lower end of a steel bar correspondingly.

Description

Technical Field

[0001] The utility model relates to the technical field of steel bar fatigue testing machines, in particular to an electro-hydraulic servo steel bar fatigue testing machine. Background Art

[0002] An electro-hydraulic servo steel bar fatigue testing machine, manufactured using electro-hydraulic servo technology, is primarily used for static compression and dynamic fatigue testing of metal materials, such as steel bars, to evaluate their fatigue resistance. Prior art Chinese utility model patent publication number CN217384966U proposes a bidirectional ribbed clamp surface steel bar tensile testing machine. The testing machine consists of a tensile testing machine body and clamping members, two of which are fixed to the center of the base and the center of the crossbeam of the tensile testing machine body, respectively. The two ends of the steel bar to be tested are fixed to the two clamping members. The bottom of the clamping member's fixed tube is provided with a steel bar groove. The inner side of the steel bar groove is provided with a plurality of plate grooves. A clamping plate is movably mounted within the plate groove. The side of the plate groove away from the steel bar groove is provided with a screw hole. A threaded rod is mounted within the screw hole. An adjusting cap for rotating the threaded rod is fixed to the end of the threaded rod. A clamping groove for clamping the steel bar is provided on one side of the clamping plate near the center of the steel bar groove. Spring sleeves are fixed to the front and rear sides of the clamping plate. A spring is fixed between the two spring sleeves of the two opposing clamping plates. Before conducting a tensile test, place the upper and lower ends of the rebar into the two rebar slots of the holding mechanism. Using a sleeve tool, rotate the adjustment cap, allowing the threaded rod to push the clamping plate to clamp the rebar. The clamping plate's clamping slots align with the rebar, firmly clamping it. The rebar tensile testing machine can then be activated for testing. This rebar tensile testing machine offers quick and easy rebar clamping, excellent grip, and excellent practicality.

[0003] However, when the above-mentioned testing machine performs tensile and fatigue tests on steel bars, the steel bars are stretched or compressed by the extension and retraction of a hydraulic rod. The extension and retraction speed and rhythm of the hydraulic rod are low, resulting in low working efficiency. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an electro-hydraulic servo steel bar fatigue testing machine which has higher speed and frequency for stretching and compressing steel bars and improves the working efficiency of the test.

[0005] The utility model relates to an electro-hydraulic servo steel bar fatigue testing machine, comprising a frame, an upper beam and a pressure hydraulic rod, the upper beam being slidably mounted on the upper part of the frame, the fixed end of the pressure hydraulic rod being mounted on the frame, and the piston rod of the pressure hydraulic rod being connected to the upper beam; the utility model also comprises an upper clamping seat, a reduction motor, a flywheel, a slider, a lower clamping seat and two clamping assemblies, the upper clamping seat being rotatably mounted on the upper beam, the reduction motor being mounted on the lower part of the frame, the flywheel being concentrically mounted on the output shaft of the reduction motor, a mounting groove being provided on the end surface of the flywheel, the slider being mounted in the mounting groove of the flywheel, the slider being eccentric to the flywheel, the lower clamping seat being rotatably mounted on the slider, the lower clamping seat and the upper clamping seat being both mounted with clamping assemblies, and the two clamping assemblies respectively clamping the upper end and the lower end of the steel bar; during operation, the position of the slider on the mounting groove of the flywheel is adjusted according to the magnitude of the force applied to the steel bar, thereby adjusting the distance between the slider and the center of the flywheel. , according to the length of the steel bar, the piston rod of the hydraulic rod is extended and retracted, the distance between the upper beam and the flywheel is adjusted, the mounting slot of the flywheel is adjusted to a horizontal state, the upper end of the steel bar is clamped on the clamping assembly of the upper clamp seat, and the lower end of the steel bar is clamped on the clamping assembly of the lower clamp seat. The reduction motor drives the flywheel to rotate, so that the flywheel drives the slider and the lower clamp seat to move in a circle. When the lower clamp seat is below the center of the flywheel, the steel bar is stretched, and when the lower clamp seat is above the center of the flywheel, the steel bar is compressed. The degree and strength of the stretching and compression of the steel bar are related to the distance between the slider and the center of the flywheel. At the same time, when the steel bar is stretched and compressed, the upper clamp seat swings adaptively under the drive of the upper end of the steel bar, and the lower clamp seat swings adaptively under the drive of the lower end of the steel bar. Compared with the existing technology, the speed and frequency of steel bar stretching and compression are higher, thereby improving the work efficiency of the test.

[0006] Preferably, it also includes a shaft rod, which is rotatably mounted on the upper beam through a bearing assembly, and an upper clamp seat is mounted on the end of the shaft rod; the upper clamp seat is rotatably mounted on the upper beam through the shaft rod, thereby improving the rotation smoothness and stability of the upper clamp seat.

[0007] Preferably, it also includes an arm plate and a pin, a positioning hole is set on the upper beam, the arm plate is installed on the shaft rod, and the pin is inserted into the positioning hole of the upper beam through the pin hole of the arm plate; when the axial fatigue test of tension and compression is performed on the steel bar, the pin is pulled out from the arm plate, so that the shaft rod and the upper clamp seat can rotate freely. When the bending fatigue test is performed on the end of the steel bar, the pin is inserted into the positioning hole of the upper beam through the pin hole of the arm plate, and the arm plate and the shaft rod are fixed. At this time, the upper part of the steel bar is fixed and the lower part swings back and forth and is subjected to tension and compression, thereby realizing the bending fatigue test of the steel bar, which is practical.

[0008] Preferably, the clamping assembly includes two cams and two connecting pieces. The two cams are respectively mounted on the upper clamping seat or the lower clamping seat through a lockable rotation of a rotating shaft. The two cams are arranged opposite to each other. The wheel surfaces of the two cams are provided with grooves for clamping the steel bars. Connectors are provided on the end faces of the two cams. The end of the steel bar is placed between the two cams, and the two cams are rotated through the two connecting pieces so that the protrusions of the two cams are close to each other so that the grooves of the two cams clamp the end of the steel bar. The structure is simple and practical.

[0009] Preferably, it also includes multiple gears, which are concentrically installed on the rotating shafts of multiple cams, the two gears on the upper clamping seat are meshed, and the two gears on the lower clamping seat are meshed; the four gears are meshed in pairs, so that the two cams on the upper clamping seat rotate synchronously relative to each other, and the two cams on the lower clamping seat rotate synchronously relative to each other, thereby improving operational convenience.

[0010] Preferably, it also includes two screws and two pressure plates, the two screws are respectively rotatably screwed on the upper clamping seat and the lower clamping seat, the two pressure plates are respectively installed on the inner ends of the two screws, and the two pressure plates are respectively aligned with the gears in the upper clamping seat and the gears in the lower clamping seat; when the four cams clamp the steel bars stably, the two screws are rotated and tightened to press the two pressure plates on the two gears, thereby locking the gears in the upper clamping seat and the lower clamping seat, thereby improving the stability of the steel bar clamping.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: during operation, the position of the slider on the mounting groove of the flywheel is adjusted according to the force applied to the steel bar, and then the distance between the slider and the center of the flywheel is adjusted. The piston rod of the hydraulic rod is operated to be extended and retracted according to the length of the steel bar, the distance between the upper beam and the flywheel is adjusted, and the mounting groove of the flywheel is adjusted to a horizontal state. The upper end of the steel bar is clamped on the clamping assembly of the upper clamping seat, and the lower end of the steel bar is clamped on the clamping assembly of the lower clamping seat. The reduction motor drives the flywheel to rotate, so that the flywheel drives the slider and the lower clamping seat to move in a circle. When the lower clamping seat is below the center of the flywheel, the steel bar is stretched, and when the lower clamping seat is above the center of the flywheel, the steel bar is compressed. The degree and strength of the stretching and compression of the steel bar are related to the distance between the slider and the center of the flywheel. At the same time, when the steel bar is stretched and compressed, the upper clamping seat swings adaptively under the drive of the upper end of the steel bar, and the lower clamping seat swings adaptively under the drive of the lower end of the steel bar. Compared with the prior art, the speed and frequency of the stretching and compression of the steel bar are higher, thereby improving the working efficiency of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front structural schematic diagram of the utility model;

[0013] Figure 2 It is a structural diagram of the working state of the utility model;

[0014] Figure 3It is a structural diagram of the upper beam, upper clamping seat, shaft rod and arm plate;

[0015] Figure 4 It is a schematic cross-sectional view of the upper clamping seat, shaft, clamping assembly and arm plate;

[0016] Figure 5 It is a schematic diagram of the exploded structure of the reduction motor, flywheel, slider, lower clamping seat and clamping assembly;

[0017] Figure 6 It is a schematic cross-sectional view of structures such as a flywheel, a lower clamping seat and a clamping assembly.

[0018] Markings in the accompanying drawings: 1. Frame; 2. Upper beam; 3. Hydraulic pressure rod; 4. Upper clamping seat; 5. Reducer motor; 6. Flywheel; 7. Slider; 8. Lower clamping seat; 9. Shaft; 10. Arm plate; 11. Pin; 12. Cam; 13. Connector; 14. Gear; 15. Screw; 16. Pressure plate. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0020] Example 1

[0021] like Figure 1 、 Figure 2 、 Figures 4 to 6As shown, the electro-hydraulic servo steel bar fatigue testing machine includes a frame 1, an upper beam 2 and a pressure hydraulic rod 3. The upper beam 2 is slidably mounted on the upper part of the frame 1, and the fixed end of the pressure hydraulic rod 3 is mounted on the frame 1. The piston rod of the pressure hydraulic rod 3 is connected to the upper beam 2; it also includes an upper clamping seat 4, a reduction motor 5, a flywheel 6, a slider 7, a lower clamping seat 8 and two clamping assemblies. The upper clamping seat 4 is rotatably mounted on the upper beam 2, the reduction motor 5 is mounted on the lower part of the frame 1, and the flywheel 6 is concentrically mounted on the output shaft of the reduction motor 5. A mounting groove is provided on the end surface of the flywheel 6, and the slider 7 is mounted in the mounting groove of the flywheel 6. The slider 7 is eccentric to the flywheel 6, and the lower clamping seat 8 is rotatably mounted on the slider 7. The lower clamping seat 8 and the upper clamping seat 4 are both equipped with clamping assemblies, and the two clamping assemblies clamp the upper and lower ends of the steel bar respectively; the clamping assembly includes two A cam 12 and two connecting pieces 13, the two cams 12 are respectively mounted on the upper clamping seat 4 or the lower clamping seat 8 through a lockable rotation shaft, the two cams 12 are arranged opposite to each other, the wheel surfaces of the two cams 12 are provided with grooves for holding steel bars, and connecting pieces 13 are provided on the end faces of the two cams 12; it also includes a plurality of gears 14, the plurality of gears 14 are respectively concentrically mounted on the rotating shafts of the plurality of cams 12, the two gears 14 located on the upper clamping seat 4 are meshed, and the two gears 14 located on the lower clamping seat 8 are meshed; it also includes two screws 15 and two pressure plates 16, the two screws 15 are respectively rotatably screwed on the upper clamping seat 4 and the lower clamping seat 8, the two pressure plates 16 are respectively mounted on the inner ends of the two screws 15, and the two pressure plates 16 are respectively aligned with the gears 14 in the upper clamping seat 4 and the gears 14 in the lower clamping seat 8.

[0022] During operation, the position of the slider 7 on the mounting groove of the flywheel 6 is adjusted according to the force applied to the steel bar, and then the distance between the slider 7 and the center of the flywheel 6 is adjusted. The piston rod of the hydraulic rod 3 is operated to extend and retract according to the length of the steel bar, and the distance between the upper beam 2 and the flywheel 6 is adjusted. The mounting groove of the flywheel 6 is adjusted to a horizontal state, and the end of the steel bar is placed between the two cams 12 of the upper clamping seat 4 and the lower clamping seat 8. The cam 12 is rotated through the two connecting parts 13, and the engagement of multiple gears 14 causes the multiple cams 12 to rotate synchronously relative to each other, so that the protrusions of the two cams 12 are close to each other, so that the grooves of the two cams 12 clamp the end of the steel bar. When the four cams 12 clamp the steel bar stably, the two screws 15 are rotated and tightened to press the two pressure plates 16 On the two gears 14, the gears 14 in the upper clamping seat 4 and the lower clamping seat 8 are locked, thereby improving the stability of the steel bar clamping, and the reduction motor 5 drives the flywheel 6 to rotate, so that the flywheel 6 drives the slider 7 and the lower clamping seat 8 to move in a circle. When the lower clamping seat 8 is below the center of the flywheel 6, the steel bar is stretched, and when the lower clamping seat 8 is above the center of the flywheel 6, the steel bar is compressed. The degree and strength of the stretching and compression of the steel bar are related to the distance between the slider 7 and the center of the flywheel 6. At the same time, when the steel bar is stretched and compressed, the upper clamping seat 4 swings adaptively under the drive of the upper end of the steel bar, and the lower clamping seat 8 swings adaptively under the drive of the lower end of the steel bar. Compared with the existing technology, the speed and frequency of the steel bar stretching and compression are higher, thereby improving the work efficiency of the test.

[0023] Example 2

[0024] like Figure 3 As shown, on the basis of Example 1, it also includes a shaft rod 9, which is rotatably mounted on the upper beam 2 through a bearing assembly, and the upper clamp seat 4 is mounted on the end of the shaft rod 9; it also includes an arm plate 10 and a pin 11, a positioning hole is provided on the upper beam 2, the arm plate 10 is mounted on the shaft rod 9, and the pin 11 passes through the pin hole of the arm plate 10 and is inserted into the positioning hole of the upper beam 2.

[0025] The upper clamping seat 4 is rotatably mounted on the upper beam 2 via the shaft 9, which improves the smoothness and stability of the rotation of the upper clamping seat 4. When the steel bar is subjected to an axial fatigue test of tension and compression, the pin 11 is pulled out from the arm plate 10, allowing the shaft 9 and the upper clamping seat 4 to rotate freely. When the end of the steel bar is subjected to a bending fatigue test, the pin 11 is passed through the pin hole of the arm plate 10 and inserted into the positioning hole of the upper beam 2, and the arm plate 10 and the shaft 9 are fixed. At this time, the upper part of the steel bar is fixed while the lower part swings back and forth and is subjected to tension and compression, thereby realizing a bending fatigue test of the steel bar.

[0026] like Figures 1 to 6As shown, the electro-hydraulic servo steel bar fatigue testing machine of the present invention, when working, first adjusts the position of the slider 7 on the mounting groove of the flywheel 6 according to the size of the force applied to the steel bar, and then adjusts the distance between the slider 7 and the center of the flywheel 6, and operates the piston rod of the hydraulic rod 3 to extend and retract according to the length of the steel bar, adjusts the distance between the upper beam 2 and the flywheel 6, and then adjusts the mounting groove of the flywheel 6 to a horizontal state, clamps the upper end of the steel bar on the clamping assembly of the upper clamping seat 4, and clamps the lower end of the steel bar on the clamping assembly of the lower clamping seat 8, and then runs the reduction motor 5 to drive the flywheel 6 to rotate, so that the flywheel 6 drives the slider 7 and the lower clamping seat 8 to move in a circle, and the lower clamping seat 8 is located at the flywheel 6. When the lower clamp seat 8 is below the center of the circle, the steel bar is stretched, and when the lower clamp seat 8 is above the center of the flywheel 6, the steel bar is compressed. The degree and strength of the stretching and compression of the steel bar are related to the distance between the slider 7 and the center of the flywheel 6. At the same time, when the steel bar is stretched and compressed, the upper clamp seat 4 swings adaptively under the drive of the upper end of the steel bar, and the lower clamp seat 8 swings adaptively under the drive of the lower end of the steel bar, thereby performing an axial fatigue test on the steel bar. Finally, the pin 11 is inserted into the positioning hole of the upper beam 2 through the pin hole of the arm plate 10, and the arm plate 10 and the shaft rod 9 are fixed. At this time, the upper part of the steel bar is fixed and the lower part swings back and forth and is stretched and compressed, thereby realizing the bending fatigue test of the steel bar.

[0027] The main functions achieved by this utility model are:

[0028] 1. The speed and frequency of steel bar stretching and compression are higher, which improves the efficiency of the test;

[0029] 2. Ability to conduct axial expansion and contraction fatigue test and bending fatigue test on steel bars;

[0030] 3. The steel bar clamping is stable and reliable, and the operation is simple.

[0031] The installation method, connection method or setting method of the electro-hydraulic servo steel bar fatigue testing machine of the present invention are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented; the frame 1, upper beam 2, pressure hydraulic rod 3, reduction motor 5, flywheel 6, slider 7, cam 12, connecting piece 13, gear 14, and screw 15 of the electro-hydraulic servo steel bar fatigue testing machine of the present invention are purchased on the market, and technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0032] All technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electro-hydraulic servo steel bar fatigue testing machine, comprising a frame (1), an upper beam (2) and a hydraulic pressure rod (3), wherein the upper beam (2) is slidably mounted on the upper portion of the frame (1), a fixed end of the hydraulic pressure rod (3) is mounted on the frame (1), and a piston rod of the hydraulic pressure rod (3) is connected to the upper beam (2); characterized in that: The invention also comprises an upper clamping seat (4), a reduction motor (5), a flywheel (6), a slider (7), a lower clamping seat (8) and two clamping assemblies, wherein the upper clamping seat (4) is rotatably mounted on the upper beam (2), the reduction motor (5) is mounted on the lower part of the frame (1), the flywheel (6) is concentrically mounted on the output shaft of the reduction motor (5), a mounting groove is provided on the end face of the flywheel (6), the slider (7) is mounted in the mounting groove of the flywheel (6), the slider (7) is eccentric to the flywheel (6), the lower clamping seat (8) is rotatably mounted on the slider (7), the lower clamping seat (8) and the upper clamping seat (4) are both mounted with clamping assemblies, and the two clamping assemblies respectively clamp the upper end and the lower end of the steel bar.

2. The electro-hydraulic servo steel bar fatigue testing machine according to claim 1, characterized in that: It also includes a shaft rod (9), which is rotatably mounted on the upper beam (2) through a bearing assembly, and an upper clamping seat (4) is mounted on the end of the shaft rod (9).

3. The electro-hydraulic servo steel bar fatigue testing machine according to claim 2, characterized in that: The invention also comprises an arm plate (10) and a latch (11); a positioning hole is provided on the upper beam (2); the arm plate (10) is mounted on the shaft (9); and the latch (11) passes through the pin hole of the arm plate (10) and is inserted into the positioning hole of the upper beam (2).

4. The electro-hydraulic servo steel bar fatigue testing machine according to claim 1, characterized in that: The clamping assembly comprises two cams (12) and two connecting pieces (13). The two cams (12) are respectively mounted on the upper clamping seat (4) or the lower clamping seat (8) through a rotating shaft so as to be locked and rotated. The two cams (12) are arranged opposite to each other. The wheel surfaces of the two cams (12) are provided with grooves for clamping steel bars. The end surfaces of the two cams (12) are both provided with connecting pieces (13).

5. The electro-hydraulic servo steel bar fatigue testing machine according to claim 4, characterized in that: It also includes a plurality of gears (14), which are respectively concentrically mounted on the rotating shafts of the plurality of cams (12), two gears (14) on the upper clamping seat (4) are meshed, and two gears (14) on the lower clamping seat (8) are meshed.

6. The electro-hydraulic servo steel bar fatigue testing machine according to claim 5, characterized in that: The utility model further comprises two screw rods (15) and two pressing plates (16). The two screw rods (15) are respectively screwed on the upper clamping seat (4) and the lower clamping seat (8). The two pressing plates (16) are respectively installed on the inner ends of the two screw rods (15). The two pressing plates (16) are respectively aligned with the gear (14) in the upper clamping seat (4) and the gear (14) in the lower clamping seat (8).

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