Stretching direction bending test tool and device

Abstract

The invention discloses a stretching direction bending test tool and device, the stretching direction bending test tool comprises a fixed base and a stretching seat used for being in butt joint with a driving end of a stretching testing machine, a pair of sliding bases which are symmetrically distributed left and right are slidably mounted on the fixed base, and a pair of roll shaft fixing rods which are distributed front and back are fixed in the middle of the fixed base; a bending roller is rotationally mounted on the pair of roller shaft fixing rods; the bending plate assembly is used for being matched with the bending roller to conduct a bending test on the structural steel, the bending plate assembly comprises a pair of bending bottom plates which are symmetrically distributed, each bending bottom plate is provided with a downward inclined top wall facing the bending roller, and the end, close to the bending roller, of each bending bottom plate is connected with the sliding base on the corresponding side in a rotating fit mode; the upper end of the connecting swing arm set on each side is connected with the stretching seat in a running fit mode, the structure is reasonable, the structural steel can be better subjected to a bending test, and the bending angle of the structural steel can meet the machining requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of bending tests, in particular to a tensile bending test tool and device. Background Art

[0002] "Metallic Material Bending Test Method" (GB / T232-2010) stipulates that the bending test is to subject a circular, square, rectangular or polygonal cross-section specimen to plastic deformation on a bending device without changing the direction of force until the specified bending angle is reached.

[0003] During the bending test, the axes of the two arms of the specimen are kept in a plane perpendicular to the bending axis. If the bending test is at a 180° angle, the specimen can be bent until the two arms are in direct contact or parallel to each other and at a specified distance in accordance with the requirements of the relevant product standards. Pads can be used to control the specified distance.

[0004] The bending test device specified above usually places the structural steel on a pair of support rollers. Then, the upper pressure roller applies downward pressure. When the pressure is pressed into the gap between the two support rollers, the structural steel is deformed to complete the bending test (see Appendix Figure 5 ), although the bending angle can reach 180°, the structural steel has elastic deformation. When the pressure is released, the two arms of the structural steel will rebound, making the bending angle of the structural steel after bending less than 180°, which cannot meet the use requirements well.

[0005] GB / T 232-2024 "Methods for bending test of metallic materials" was implemented on October 1, 2024, and the restrictions on bending devices were removed. Other bending devices that conform to the bending test principles can be used (such as: stick-type, V-type, vise-type, flip-plate bending devices, etc.). However, the above-mentioned bending devices cannot be combined with testing machines that can only perform tensile operations, nor can they bend at an angle exceeding 180°. It is difficult to solve the rebound phenomenon after 180° bending, and the operation is relatively limited. Therefore, a tensile bending test tool and device are urgently needed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a tensile bending test tool and device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A tensile bending test tool comprises: a fixed base and a stretching seat for docking with the driving end of a tensile testing machine, a pair of sliding bases symmetrically distributed left and right are slidably installed on the fixed base, a pair of roller fixing rods distributed front and back are fixed in the middle position of the fixed base, and bending rollers are rotatably installed on the pair of roller fixing rods; a bending plate assembly is used to cooperate with the bending roller to perform a bending test on structural steel, the bending plate assembly comprises a pair of symmetrically distributed bending bottom plates, the bending bottom plates have an inclined top wall downward in the direction of the bending roller, and one end of each bending bottom plate close to the bending roller is rotatably connected to the sliding base on the corresponding side; a pair of connecting swing arm groups symmetrically distributed left and right, the upper end of the connecting swing arm group on each side is rotatably connected to the tensile seat, and the lower end of the connecting swing arm group on each side is rotatably connected to the end of the bending bottom plate on the corresponding side away from the bending roller, for pulling the bending plate assembly to move.

[0009] As a preferred solution, it also includes an adjustment component, which includes a pair of adjustment seats fixed at both ends of the fixed base, an adjustment screw is rotatably installed between the pair of adjustment seats, a pair of sliding bases are respectively threaded on the left and right sides of the adjustment screw, and an adjustment wheel is also rotatably installed at the end of the adjustment seat, and the end of the adjustment wheel is drivingly connected to the shaft end of the adjustment screw.

[0010] As a preferred solution, the threads on the left and right sides of the adjusting screw have opposite rotation directions.

[0011] As a preferred solution, a sliding groove is further provided at the lower portion of the fixed base, and connecting sliders are installed at corresponding positions on the front and rear sides of the sliding base, and the connecting sliders are slidably installed in the sliding groove.

[0012] As a preferred solution, a pair of connecting plates distributed front and back are fixed to the lower end of the curved base plate. The end of the connecting plate close to the bending roller is rotatably connected to the connecting seat on the sliding base through an inner rotating shaft, and the end of the connecting plate away from the bending roller is rotatably connected to the lower end of the connecting swing arm group through an outer rotating shaft.

[0013] As a preferred solution, the stretching seat is fixedly connected to a vertically extending stretching rod, a stretching shaft is fixed to the lower end of the stretching rod, and the connecting swing arm group includes a pair of connecting swing arms distributed front and back, the upper ends of the connecting swing arms are rotatably connected to the stretching shaft, and the lower ends of the connecting swing arms are rotatably connected to the corresponding outer rotating shaft.

[0014] As a preferred solution, the central axes of the inner rotating shaft, the outer rotating shaft, the stretching shaft and the bending roller are parallel to each other.

[0015] As a preferred solution, an adjustment plate is further installed on the curved bottom plate.

[0016] A tensile bending test device includes the tensile bending test tooling and a tensile testing machine, wherein the fixed base is fixedly mounted on a lower clamping seat of the tensile testing machine, and the tensile seat is fixedly mounted on an upper clamping seat at the driving end of the tensile testing machine.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: by driving the upper clamp seat upward through the tensile testing machine, the connecting swing arm and the connecting plate can be driven to move, thereby causing the bending base plate to rotate around the inner rotating shaft. The rotating bending base plates on both sides push the two arms of the structural steel, and can cooperate with the bending roller to perform a bending test on the structural steel. Since the bending base plate has an inclined top wall downward toward the bending roller, it is convenient to push the two arms of the structural steel so that its rotation angle can exceed 90°. The bending base plates at both ends are bent at the same time, so that the structural steel can be bent by more than 180°. Due to the elastic deformation of the structural steel, the structural steel can still maintain a bending angle of 180° after the pressure is subsequently released, thereby better meeting the use requirements. The present invention has a reasonable structure and can better perform bending tests on structural steel so that its bending angle meets the processing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a tensile bending test fixture;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of a fixed base of a tensile bending test fixture;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the sliding base of a tensile bending test fixture;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of a tensile bending test device;

[0022] Figure 5 A schematic diagram of the structure of the existing bending test device;

[0023] Figure 6 A schematic diagram of the structure of the bending test of the present invention;

[0024] Figure 7 This is a schematic diagram of the overall structure of another scheme of a tensile bending test fixture.

[0025] In the figure: 1. Fixed base; 11. Roller fixing rod; 12. Bending roller; 13. Slide; 2. Sliding base; 21. Connecting seat; 22. Connecting plate; 221-Inner rotating shaft; 222-Outer rotating shaft; 23. Bending bottom plate; 24. Connecting swing arm; 25. Connecting slider; 26. Adjusting plate; 3. Stretching seat; 31. Stretching rod; 32. Stretching shaft; 4. Adjusting seat; 41. Adjusting screw; 42. Adjusting wheel; 5. Tensile testing machine; 51. Lower clamping seat; 52. Upper clamping seat; 6. Support roller; 7. Pressure roller. DETAILED DESCRIPTION

[0026] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] Example: See Figures 1 to 6 A tensile bending test fixture includes: a fixed base 1 and a stretching seat 3 for docking with the driving end of a tensile testing machine 5. A pair of sliding bases 2 symmetrically distributed left and right are slidably mounted on the fixed base 1. A pair of roller fixing rods 11 distributed front and back are fixed in the middle position of the fixed base 1. The roller fixing rods 11 of corresponding lengths can be replaced according to actual needs. For example, if the thickness of the structural steel exceeds 30mm, a longer roller fixing rod 11 can be replaced. A pair of bending rollers 12 are rotatably mounted on the pair of roller fixing rods 11. Bending rollers of different diameters can be replaced according to actual test requirements. 12; a bending plate assembly, used to cooperate with the bending roller 12 to perform a bending test on the structural steel, the bending plate assembly includes a pair of symmetrically distributed bending base plates 23, the bending base plates 23 have an inclined top wall facing downward toward the bending roller 12, and one end of each bending base plate 23 close to the bending roller 12 is rotatably connected to the sliding base 2 on the corresponding side; a pair of connecting swing arm groups symmetrically distributed on the left and right, the upper end of the connecting swing arm group on each side is rotatably connected to the stretching seat 3, and the lower end of the connecting swing arm group on each side is rotatably connected to the end of the bending base plate 23 on the corresponding side away from the bending roller 12, which is used to pull the bending plate assembly to move.

[0028] The working principle of the tensile bending test fixture is as follows: the driving end of the tensile testing machine 5 can pull the bending base plate 23 on the corresponding side to rotate through the tensile seat 3 and a pair of connecting swing arm groups. The rotating bending base plate 23 pushes the structural steel, so that the structural steel can bend around the bending roller 12, thereby processing a product with an approximate 180° bend.

[0029] Since the bending bottom plate 23 has an inclined top wall facing downward toward the bending roller 12, and the two ends of the structural steel are resting on the bending bottom plates 23 on the corresponding sides, the height position of the upper surface of the structural steel can be changed by adjusting the distance between the sliding bases 2 on both sides. Before stretching and bending, by adjusting the distance between the sliding bases 2 on both sides, it is only necessary to make the upper surface of the structural steel rest against the bending roller 12 to perform subsequent stretching and bending operations. Therefore, the present invention can adapt to bending tests of structural steel within a certain length range and a certain thickness range.

[0030] In addition, since the bending bottom plate 23 has a downward inclined top wall toward the bending roller 12, when the connecting swing arm group pulls the bending plate assembly to rotate, the bending bottom plate 23 can push the two arms of the structural steel so that its rotation angle can exceed 90°. The bending bottom plates 23 at both ends are bent at the same time, which can make the structural steel bend more than 180°. Even if the structural steel undergoes a certain amount of elastic deformation later, the structural steel can still maintain a bending angle of approximately 180°, ensuring a good bending effect.

[0031] In order to adapt to structural steels of different thicknesses, the existing bending test device needs to adjust the distance between the two support rollers 6. Even after the adjustment is completed, it is still unable to drive the structural steel to bend more than 180°, and the device is not compatible with the tensile testing machine 5.

[0032] In this embodiment, the sliding base 2 can be manually adjusted. In order to lock the position of the sliding base 2, the sliding base 2 can be threadedly installed with a locking bolt, and the end of the locking bolt is used to interfere with the fixed base 1. By tightening the locking bolt, the sliding base 2 can be locked on the fixed base 1.

[0033] As another specific solution, in order to facilitate the adjustment of the positions of the sliding bases 2 on both sides, facilitate the contact between the structural steel and the bending roller 12, and facilitate the bending test, the adjustment assembly includes a pair of adjustment seats 4 fixed at both ends of the fixed base 1, and an adjusting screw 41 is rotatably installed between the pair of adjustment seats 4. A pair of sliding bases 2 are respectively threaded on the left and right sides of the adjusting screw 41, and an adjusting wheel 42 is also rotatably installed at the end of the adjustment seat 4. The end of the adjusting wheel 42 is drive-connected to the shaft end of the adjusting screw 41, and the left and right sides of the adjusting screw 41 have opposite thread rotation directions.

[0034] The working principle of the adjustment component is: when adjusting, rotate the adjustment wheel 42 in the forward direction, so that it drives the adjustment screw 41 to rotate forward, thereby making the sliding bases 2 on the left and right sides approach each other. In conjunction with the bending plate component, the structural steel on the bending plate component can be made to fit against the bending roller 12, which is convenient for subsequent bending tests.

[0035] As a further solution, a slide groove 13 is further provided at the lower portion of the fixed base 1, and connecting sliders 25 are installed at corresponding positions on the front and rear sides of the sliding base 2. The connecting sliders 25 are slidably installed in the slide groove 13. By providing the slide groove 13 and the connecting sliders 25, the stability of the movement can be improved on the one hand, and the sliding base 2 can be pressed down during subsequent stretching.

[0036] As a further solution, in order to facilitate the connection and assembly of the bending base plate 23 on the sliding base 2, a pair of connecting plates 22 distributed front and back are fixed to the lower end of the bending base plate 23. The end of the connecting plate 22 close to the bending roller 12 is rotatably connected to the connecting seat 21 on the sliding base 2 through the inner rotating shaft 221, and the end of the connecting plate 22 away from the bending roller 12 is rotatably connected to the lower end of the connecting swing arm group through the outer rotating shaft 222.

[0037] As a further solution, the stretching seat 3 is fixedly connected to a vertically extending stretching rod 31, and a stretching shaft 32 is fixed to the lower end of the stretching rod 31. The connecting swing arm group includes a pair of connecting swing arms 24 distributed front and back, and the upper ends of the connecting swing arms 24 are rotatably connected to the stretching shaft 32, and the lower ends of the connecting swing arms 24 are rotatably connected to the corresponding outer rotating shaft; the inner rotating shaft 221, the outer rotating shaft 222, the stretching shaft 32 and the central axis of the bending roller 12 are parallel to each other.

[0038] See also Figure 7 In order to enable the device of the present invention to adapt to structural steel with a wider size range (length, thickness), an adjustment plate 26 is also installed on the bending base plate 23, which can be replaced in thickness so as to bend structural steel plates of different thicknesses. The thickness adjustment range can be specifically 1mm to 30mm.

[0039] A tensile bending test device includes a tensile bending test tool and a tensile testing machine 5, wherein the fixed base 1 is fixedly mounted on a lower clamping seat 51 of the tensile testing machine 5, and the tensile seat 3 is fixedly mounted on an upper clamping seat 52 of the tensile testing machine 5.

[0040] The working principle of the present invention is as follows: when in use, the structural steel is placed on the bending base plate 23, and then the position of the sliding base 2 is adjusted by the adjustment component so that the upper surface of the structural steel is in contact with the bending roller 12. Then, the upper clamping seat 52 is driven upward by the tensile testing machine 5, which can drive the connecting swing arm 24 and the connecting plate 22 to move, so that the bending base plate 23 is rotated around the inner rotating shaft 221. The bending base plates 23 rotating on both sides push the two arms of the structural steel, and can cooperate with the bending roller 12 to perform a bending test on the structural steel. Since the bending base plate 23 has an inclined top wall downward toward the bending roller 12, it is convenient to push the two arms of the structural steel so that its rotation angle can exceed 90°. The bending base plates 23 at both ends are bent at the same time, which can make the structural steel bend more than 180°. Due to the elastic deformation of the structural steel, the structural steel can still maintain a bending angle of 180° after the subsequent pressure is released, thereby better meeting the use requirements.

[0041] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and should not be understood as limiting the present invention.

Claims

1. A tensile bending test tool, characterized in that: include: A fixed base (1) and a stretching seat (3) for docking with a driving end of a tensile testing machine (5); a pair of sliding bases (2) symmetrically distributed left and right are slidably mounted on the fixed base (1); a pair of roller fixing rods (11) distributed front and back are fixed in the middle of the fixed base (1); bending rollers (12) are rotatably mounted on the pair of roller fixing rods (11); A bending plate assembly is used to cooperate with a bending roller (12) to perform a bending test on structural steel. The bending plate assembly includes a pair of symmetrically distributed bending bottom plates (23). The bending bottom plates (23) have an inclined top wall facing downward toward the bending roller (12). One end of each bending bottom plate (23) close to the bending roller (12) is rotatably connected to a sliding base (2) on the corresponding side. A pair of connecting swing arm groups are symmetrically distributed on the left and right, the upper end of the connecting swing arm group on each side is rotatably connected to the stretching seat (3), and the lower end of the connecting swing arm group on each side is rotatably connected to the end of the bending bottom plate (23) on the corresponding side away from the bending roller (12), which is used to pull the bending plate assembly to move.

2. The tensile bending test fixture according to claim 1, characterized in that: The invention also includes an adjustment assembly, which includes a pair of adjustment seats (4) fixed at both ends of the fixed base (1), an adjustment screw (41) is rotatably installed between the pair of adjustment seats (4), a pair of sliding bases (2) are respectively threadedly mounted on the left and right sides of the adjustment screw (41), and an adjustment wheel (42) is rotatably installed at the end of the adjustment seat (4), and the end of the adjustment wheel (42) is drivingly connected to the shaft end of the adjustment screw (41).

3. The tensile bending test fixture according to claim 2, characterized in that: The left and right sides of the adjusting screw (41) have opposite screw threads.

4. The tensile bending test fixture according to claim 3, characterized in that: A sliding groove (13) is further provided at the lower portion of the fixed base (1), and connecting sliders (25) are installed at corresponding positions on the front and rear sides of the sliding base (2), and the connecting sliders (25) are slidably installed in the sliding groove (13).

5. The tensile bending test fixture according to claim 4, characterized in that: A pair of connecting plates (22) distributed front and back are fixed to the lower end of the bending base plate (23); one end of the connecting plate (22) close to the bending roller (12) is rotatably connected to the connecting seat (21) on the sliding base (2) via an inner rotating shaft (221); and one end of the connecting plate (22) away from the bending roller (12) is rotatably connected to the lower end of the connecting swing arm group via an outer rotating shaft (222).

6. The tensile bending test fixture according to claim 5, characterized in that: The stretching seat (3) is fixedly connected to a stretching rod (31) extending vertically, and a stretching shaft (32) is fixed to the lower end of the stretching rod (31). The connecting swing arm group includes a pair of connecting swing arms (24) distributed front and back, the upper ends of the connecting swing arms (24) are rotatably connected to the stretching shaft (32), and the lower ends of the connecting swing arms (24) are rotatably connected to the corresponding outer rotating shaft.

7. The tensile bending test fixture according to claim 6, characterized in that: The central axes of the inner rotating shaft (221), the outer rotating shaft (222), the stretching shaft (32) and the bending roller (12) are parallel to each other.

8. The tensile bending test fixture according to claim 1, characterized in that: An adjustment plate (26) is also installed on the curved bottom plate (23).

9. A tensile bending test device, characterized by: A tensile bending test tool comprising any one of claims 1 to 8; It also includes a tensile testing machine (5), wherein the fixed base (1) is fixedly mounted on a lower clamping seat (51) of the tensile testing machine (5), and the tensile seat (3) is fixedly mounted on an upper clamping seat (52) at the driving end of the tensile testing machine (5).

Images