Mechanical property testing device for steel pipe scaffold fastener

Abstract

The utility model discloses a mechanical property testing device for a steel pipe scaffold fastener, which belongs to the field of testing devices, and comprises a testing stand and a testing mechanism which is arranged on the testing stand and is used for testing the tensile resistance of the scaffold fastener, the testing mechanism comprises a fixing frame and a hydraulic cylinder which are installed on the top of the testing table and arranged oppositely, and a U-shaped fixing sleeve is fixedly installed on the face, opposite to the hydraulic cylinder, of the fixing frame. According to the testing device, two steel pipes are inserted into a fixed sleeve and a movable sleeve from the side direction through a first inserting hole and a second inserting hole respectively, then the two steel pipes are fastened from the side face between the two steel pipes through a fastener, then a hydraulic cylinder is started, the hydraulic cylinder pulls the movable sleeve through the output end, the two steel pipes are subjected to pulling force in the two directions, and then the two steel pipes are clamped. And required numerical values are measured through the two pressure sensors, so that the simulation effect is good, and the measurement accords with reality.

Description

Technical Field

[0001] The utility model relates to the field of test devices, in particular to a mechanical property test device for steel pipe scaffold fasteners. Background Technique

[0002] The mechanical property testing machine for steel pipe scaffold fasteners is a detection device designed according to the requirements of mechanical property test methods. This detection device can detect the mechanical properties of right-angle fasteners, swivel fasteners, butt fasteners and bases, such as anti-slip, anti-breakage, torsional stiffness, tensile and compressive properties. In the design, a force measurement system composed of high-precision tension and compression sensors and high-performance force measuring instruments is adopted, which has the advantages of bidirectional tension and compression measurement function, high measurement accuracy and fast speed.

[0003] The Chinese utility model patent with the publication number CN217111858U discloses a mechanical property testing device for steel pipe scaffold fasteners. During its use, when the hydraulic cylinder drives the connecting plate to move in the chute section, the pressure test of the workpiece can be completed. When the hydraulic cylinder continues to drive the workpiece to move downward, through the limitation of the connecting shaft by the limiting groove, it can drive its rotation, so as to complete the torque detection of the workpiece, achieving the effect of simultaneously measuring the compressive capacity and the torque of the workpiece. However, the way it conducts the pressure test on the fastener is to directly squeeze and test the fastener. In the actual use process of the steel pipe scaffold, the pressure received by the fastener is generated by the connection and transmission of the steel pipe parts. However, the existing technology lacks a test method that combines the steel pipe and the fastener for testing to simulate the actual situation, which may cause certain inaccuracies in the test.

[0004] Therefore, a mechanical property test device for steel pipe scaffold fasteners is provided to solve the above problems. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] The utility model provides a mechanical property test device for steel pipe scaffold fasteners, aiming to solve the problem that the existing technology lacks a test method that combines the steel pipe and the fastener for testing to simulate the actual situation, which may cause certain inaccuracies in the test.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the utility model provides the following technical solution: A mechanical property test device for steel pipe scaffold fasteners, including a test bench and a test mechanism installed on the test bench for conducting tensile tests on scaffold fasteners:

[0009] In order to simulate the test of steel pipe scaffold fasteners in actual use, the test mechanism includes a fixed frame and a hydraulic cylinder that are oppositely arranged on the top of the test bench. A U-shaped fixed sleeve is fixedly installed on the opposite surfaces of the fixed frame and the hydraulic cylinder. A first insertion hole for inserting a steel pipe is provided on the side wall of the fixed sleeve. The output end of the hydraulic cylinder faces the fixed frame and a movable sleeve arranged in a U shape and corresponding to the fixed sleeve is movably installed at the end. A second insertion hole for inserting another steel pipe is provided on the side wall of the movable sleeve. Pressure sensors are fixedly installed on the inner walls of the first insertion hole and the second insertion hole. The two steel pipes are respectively inserted into the fixed sleeve and the movable sleeve from the side through the first insertion hole and the second insertion hole, and then the two steel pipes are fastened from the side with a fastener between the two steel pipes. Subsequently, the hydraulic cylinder is started, and the hydraulic cylinder pulls the movable sleeve through the output end. The two steel pipes are subjected to tensile forces in two directions, and the required values are measured by the two pressure sensors. The simulation effect is good and the measurement conforms to the actual situation.

[0010] Preferably, in order to adjust the angle of the fastener so that a suitable crossing angle is generated between the two steel pipes, a connecting seat is fixedly installed at the end of the output end of the hydraulic cylinder. A connecting rod is rotatably installed on the outer wall of the side of the connecting seat away from the output end of the hydraulic cylinder. One end of the connecting rod away from the connecting seat is fixedly installed on the outer side wall of the movable sleeve. The connecting rod is rotatably connected to the connecting seat and rotates along with the rotating shaft between the two components of the fastener, simulating the crossing angle existing when the steel pipe parts are installed with the fastener in the actual situation, and the test is more convenient.

[0011] Preferably, in order to accurately debug the degree of the crossing angle, the contact surface between the connecting seat and the connecting rod is provided with damping. Scale lines are circumferentially arranged on the outer wall of the connecting seat. An indicator corresponding to the scale line is arranged at the center position of the top of the connecting rod. By indicating the ° position on the scale line with the indicator, it means that the components on both sides of the fastener are horizontal, that is, the two steel pipes are horizontal at this time. By rotating the connecting rod, the indicator will change the degree of the scale line it indicates as it rotates. Stop rotating when the test angle is reached, so that the steel pipe on the movable sleeve and the steel pipe on the fixed sleeve have a specified angle, and thus the tensile test can be carried out according to the required angle, which is convenient and fast.

[0012] Preferably, in order to facilitate the rotation of the connecting rod, a knurled surface is provided on the outer side wall of the connecting rod. The knurled surface increases the friction force on the surface of the connecting rod, and it is more convenient to rotate it when holding the surface of the connecting rod by hand.

[0013] Preferably, in order to adapt to fasteners of different sizes when installing fasteners, the experimental device further includes an adjustment mechanism. The adjustment mechanism includes a chute opened at the top of the test bench below the hydraulic cylinder and a driving motor arranged on the side of the test bench. A lead screw fixedly connected to the output end of the driving motor is rotatably installed in the chute. A slider is screwed on the outer side wall of the lead screw. A mounting seat for fixing the hydraulic cylinder is fixedly installed on the slider. By driving the lead screw to rotate through the driving motor, the slider is driven to perform a lateral displacement in the chute, so as to change the distance between the hydraulic cylinder on the mounting seat and the fixing frame in the horizontal direction, and thus change the distance between the fixed sleeve and the movable sleeve, so as to adapt to fasteners of different types and sizes and improve the practicability of the device.

[0014] (III) Beneficial effects

[0015] In this test device, two steel pipes are respectively inserted into the fixed sleeve and the movable sleeve from the side through the first insertion hole and the second insertion hole, and then the two steel pipes are fastened from the side with a fastener between the two steel pipes. Subsequently, the hydraulic cylinder is started. The hydraulic cylinder pulls the movable sleeve through the output end. The two steel pipes are subjected to tensile forces in two directions, and the required values are measured by two pressure sensors. The simulation effect is good and the measurement conforms to the actual situation.

[0016] In this test device, by driving the lead screw to rotate through the driving motor, the slider is driven to perform a lateral displacement in the chute, so as to change the distance between the hydraulic cylinder on the mounting seat and the fixing frame in the horizontal direction, and thus change the distance between the fixed sleeve and the movable sleeve, so as to adapt to fasteners of different types and sizes and improve the practicability of the device. Description of the drawings

[0017] Figure 1 It is a schematic structural diagram of a mechanical property test device for steel pipe scaffold fasteners;

[0018] Figure 2 It is a schematic structural diagram of the connecting rod rotation angle of a mechanical property test device for steel pipe scaffold fasteners;

[0019] Figure 3 It is a schematic sectional structure diagram of the adjustment mechanism of a mechanical property test device for steel pipe scaffold fasteners;

[0020] Figure 4 It is Figure 1 The enlarged schematic diagram at A in

[0021] In the figure:

[0022] 1. Test bench; 2. Testing mechanism; 21. Fixed frame; 22. Hydraulic cylinder; 23. Fixed sleeve; 24. First insertion hole; 25. Movable sleeve; 26. Second insertion hole; 27. Pressure sensor; 28. Connection seat; 29. Connecting rod; 210. Scale line; 211. Indicator; 212. Grooved surface; 3. Adjusting mechanism; 31. Slide groove; 32. Driving motor; 33. Lead screw; 34. Slide block; 35. Mounting seat. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] This embodiment provides a mechanical property test device for steel pipe scaffold fasteners. As Figures 1-4 shown, the test device includes a test bench 1 and a testing mechanism 2 installed on the test bench 1 for tensile strength testing of scaffold fasteners:

[0026] The testing mechanism 2 includes a fixed frame 21 and a hydraulic cylinder 22 that are oppositely arranged on the top of the test bench 1. A U-shaped fixed sleeve 23 is fixedly installed on the opposite surfaces of the fixed frame 21 and the hydraulic cylinder 22. The side wall of the fixed sleeve 23 is provided with a first insertion hole 24 for inserting a steel pipe. The output end of the hydraulic cylinder 22 faces the fixed frame 21 and a U-shaped movable sleeve 25 is movably installed at the end. The side wall of the movable sleeve 25 is provided with a second insertion hole 26 for inserting another steel pipe. Pressure sensors 27 are fixedly installed on the inner walls of the first insertion hole 24 and the second insertion hole 26.

[0027] During use, two steel pipes are respectively inserted into the fixed sleeve 23 and the movable sleeve 25 from the side through the first insertion hole 24 and the second insertion hole 26, and then the two steel pipes are fastened from the side with a fastener between the two steel pipes. Subsequently, the hydraulic cylinder 22 is started. The hydraulic cylinder 22 pulls the movable sleeve 25 through the output end. The two steel pipes are subjected to tensile forces in two directions, and the required values are measured by the two pressure sensors 27. The simulation effect is good and the measurement conforms to the actual situation.

[0028] Among them, a connecting seat 28 is fixedly installed at the end of the output end of the hydraulic cylinder 22. A connecting rod 29 is rotatably installed on the outer wall of the side of the connecting seat 28 away from the output end of the hydraulic cylinder 22. One end of the connecting rod 29 away from the connecting seat 28 is fixedly installed on the outer wall of the movable sleeve 25. During use, the connecting rod 29 is rotatably connected to the connecting seat 28 and rotates along with the rotating shaft between the two components of the fastener, simulating the cross angle existing when the steel pipe is installed with the fastener in the actual situation, making the test more convenient.

[0029] Furthermore, the contact surface between the connecting seat 28 and the connecting rod 29 is provided with damping. Scale lines 210 are circumferentially arranged on the outer wall of the connecting seat 28, and an indicating mark 211 facing the scale lines 210 is arranged at the center position of the top of the connecting rod 29. During use, the indicating mark 211 indicates the 0° position on the scale lines 210. At this time, it means that the two components on both sides of the fastener are horizontal, that is, the two steel pipes are horizontal. By rotating the connecting rod 29, the indicating mark 211 will change the degree of the scale lines 210 it indicates as it rotates. Stop rotating when reaching the test angle, so that the steel pipe on the movable sleeve 25 and the steel pipe on the fixed sleeve 23 have a specified angle, thereby performing the tensile test according to the required angle, which is convenient and fast.

[0030] Even further, a knurled surface 212 is provided on the outer wall of the connecting rod 29. During use, the knurled surface 212 increases the friction on the surface of the connecting rod 29, making it more convenient to rotate it when holding the surface of the connecting rod 29 by hand.

[0031] Embodiment 2

[0032] Different from Embodiment 1, as Figure 1 、 Figure 2 and Figure 3 shown, the experimental device further includes an adjusting mechanism 3. The adjusting mechanism 3 includes a chute 31 opened at the top of the test bench 1 below the hydraulic cylinder 22 and a driving motor 32 arranged on the side of the test bench 1. A lead screw 33 fixedly connected to the output end of the driving motor 32 is rotatably installed in the chute 31. A slider 34 is screwed on the outer wall of the lead screw 33, and a mounting seat 35 for fixing the hydraulic cylinder 22 is fixedly installed on the slider 34.

[0033] During use, the driving motor 32 drives the lead screw 33 to rotate, thereby driving the slider 34 to perform a lateral displacement in the chute 31, thereby changing the distance between the hydraulic cylinder 22 on the mounting seat 35 and the fixed frame 21 in the horizontal direction, and thus changing the distance between the fixed sleeve 23 and the movable sleeve 25, so as to adapt to different types and sizes of fasteners and improve the practicability of the device.

[0034] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A mechanical properties testing device for steel pipe scaffold fasteners, comprising a test bench (1) and a testing mechanism (2) mounted on the test bench (1) for performing a tensile test on the scaffold fasteners, characterized in that: The test mechanism (2) comprises a fixed frame (21) and a hydraulic cylinder (22) mounted on the top of the test bench (1) and arranged opposite to each other. A fixed sleeve (23) arranged in a U shape is fixedly mounted on the opposite surface of the fixed frame (21) and the hydraulic cylinder (22). A first plug-in hole (24) for plugging in a steel pipe is provided on the side wall of the fixed sleeve (23). The output end of the hydraulic cylinder (22) is arranged toward the fixed frame (21) and a movable sleeve (25) arranged in a U shape and arranged with the fixed sleeve (23) is movably mounted at the end. A second plug-in hole (26) for plugging in another steel pipe is provided on the side wall of the movable sleeve (25). Pressure sensors (27) are fixedly mounted on the inner walls of the first plug-in hole (24) and the second plug-in hole (26).

2. A steel pipe scaffold fastener mechanical properties testing device according to claim 1, characterized in that: A connecting seat (28) is fixedly mounted at the output end of the hydraulic cylinder (22); a connecting rod (29) is rotatably mounted on an outer wall of the connecting seat (28) away from the output end of the hydraulic cylinder (22); and one end of the connecting rod (29) away from the connecting seat (28) is fixedly mounted to the outer wall of the movable sleeve (25).

3. A steel pipe scaffold fastener mechanical properties testing device according to claim 2, characterized in that: A damping device is provided between the contact surfaces of the connecting seat (28) and the connecting rod (29); a scale line (210) is circumferentially provided on the outer wall of the connecting seat (28); and an indicator mark (211) opposite to the scale line (210) is provided at the center position of the top of the connecting rod (29).

4. A steel pipe scaffold fastener mechanical properties testing device according to claim 3, characterized in that: The outer side wall of the connecting rod (29) is provided with a grinding surface (212).

5. A steel pipe scaffold fastener mechanical properties testing device according to claim 1, characterized in that: The test device also includes an adjustment mechanism (3), the adjustment mechanism (3) including a slide groove (31) opened on the top of the test bench (1) and below the hydraulic cylinder (22) and a drive motor (32) arranged on the side of the test bench (1), a drive motor (32) rotatably mounted in the slide groove (31) and connected to the drive motor (32) A screw rod (33) is fixedly connected to the output end, and a slider (34) is screwed on the outer wall of the screw rod (33). A mounting seat (35) for fixing the hydraulic cylinder (22) is fixedly mounted on the sliding block (34).

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