Device for detecting bending resistance of steel pipe

Abstract

The utility model relates to the technical field of testing machines, in particular to a steel pipe bending resistance detection device, which comprises a workbench, a rotary working arm and a shifting roller, a center bending piece is fixedly mounted at the top of the workbench, and a fixed clamp is fixedly mounted at one end, close to the center bending piece, of the workbench. The side, close to the fixed clamp, of the workbench is provided with a movable clamp matched with the workbench to clamp the end of the steel pipe. The rotary working arm is provided with a first adjusting assembly used for controlling the stirring roller to rotate. Through the arrangement of the movable clamp, the threaded connecting piece, the rotary pressing assembly and the linkage assembly, after the movable clamp and the fixed clamp clamp the steel pipe, the threaded connecting piece can form dynamic mechanical locking on the lead screw, and as the bending degree of the steel pipe is deepened, the pressure between the two movable blocks and the steel pipe is increased, the overturning torque of the steel pipe is synchronously increased; and the meshing force between the two threaded connecting pieces and the screw rod is further strengthened, so that the clamping force can be ensured to be continuous and stable in the whole detection process, and detection errors or safety accidents caused by looseness are prevented.

Description

Technical Field

[0001] This utility model relates to the field of testing machine technology, and in particular to a device for testing the bending resistance of steel pipes. Background Technology

[0002] The steel pipe bending resistance testing device is a specialized piece of equipment used to evaluate the ability of steel pipes to resist bending deformation and failure. It is widely used in material performance testing in industries such as construction, machinery manufacturing, automotive, and aerospace. Its core function is to simulate the stress state of a steel pipe under bending loads and measure key mechanical parameters (such as bending deflection, maximum load, and stress distribution) to determine whether the bending strength, stiffness, and stability of the steel pipe meet design or standard requirements.

[0003] A steel pipe bending testing machine disclosed in Chinese Patent Publication No. CN215525377U uses a rotating adjustment handle to press a V-shaped pressure block to tighten the steel pipe. The other end of the machine is driven by a rotating working arm's roller to rotate around a bending mandrel. When the rotating working arm reaches a set angle, the cycloidal pinwheel reducer is de-energized and stops rotating. However, according to existing steel pipe bending testing machines and related technologies, traditional pressure blocks or clamps typically require manual rotation of the screw nut or wrench to apply pre-tightening force. The tightening force depends on the operator's experience, which can easily lead to insufficient pre-tightening force or overload. During testing, when the steel pipe vibrates or is subjected to force, relative sliding may occur between the screw and nut due to gaps or thread wear, causing the pressure block or clamp to loosen or shift, resulting in fluctuations in test data and safety hazards. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a steel pipe bending resistance testing device.

[0005] The purpose of this utility model is achieved through the following technical solution: A steel pipe bending resistance testing device includes a worktable, a rotating working arm, and a roller. A bending mandrel is fixedly installed on the top of the worktable, and a fixed clamp is fixedly installed at one end of the worktable near the bending mandrel. A movable clamp that cooperates with the fixed clamp to clamp the end of the steel pipe is provided on the side of the worktable near the fixed clamp. A first adjustment component for controlling the rotation of the roller is provided on the rotating working arm. The movable clamp includes a mounting frame slidably disposed on the top of the worktable. Two movable blocks are rotatably disposed on the side of the mounting frame near the fixed clamp via a rotating shaft. A second adjustment component for controlling the sliding of the mounting frame is provided on the top of the worktable. The second adjustment component includes a fixed frame fixedly installed on the top of the worktable. A first lead screw is rotatably disposed near the top of the fixed frame. Two threaded connectors are symmetrically and movably connected to the mounting frame corresponding to the position of the first lead screw. Both ends of the mounting frame are provided with a rotating pressing component for controlling the two threaded connectors to move closer to each other. Each of the two movable blocks is provided with a linkage component for controlling the rotation of the rotating pressing component.

[0006] Preferably, both the bending mandrel and the fixed clamp have V-shaped support grooves on the side facing the mounting frame.

[0007] Preferably, the two movable blocks facing the fixed clamp are combined to form a V-shape.

[0008] Preferably, the rotary pressing assembly includes a gear ring rotatably disposed at the end of the mounting bracket, both ends of the threaded connector are fixedly provided with levers, an elastic element is provided between the two threaded connectors, an elliptical groove is provided at the center of the gear ring, and the levers are formed with arc surfaces at positions corresponding to the grooves.

[0009] Preferably, the linkage component includes a connecting rod fixedly installed on the movable block, and a rack that meshes with the connecting rod is fixedly provided at one end near the gear ring.

[0010] Preferably, the rack is arc-shaped, and the center point of the rack is at the same position as the center point of the rotating shaft.

[0011] Preferably, the workbench is fixedly mounted with a slide rail at the bottom of the mounting frame, and the mounting frame has a groove that matches the slide rail at the corresponding position.

[0012] Preferably, the first adjustment component includes a movable groove formed on the rotating working arm, a movable block slidably disposed inside the movable groove, a second lead screw rotatably disposed inside the rotating working arm located inside the movable groove, the movable block being threadedly connected to the second lead screw, the top end of the roller being rotatably connected to the movable block, and the roller being hourglass shaped.

[0013] Beneficial effects:

[0014] This steel pipe bending resistance testing device, by setting up a moving clamp, threaded connectors, a rotary pressing assembly, and a linkage assembly, allows the moving and fixed clamps to hold the steel pipe. The threaded connectors can dynamically and mechanically lock the lead screw. As the bending degree of the steel pipe increases, the pressure between the two moving blocks and the steel pipe increases, and the turning torque increases synchronously, further strengthening the biting force between the two threaded connectors and the lead screw. This forms a pressure adaptive locking mechanism, which can ensure that the clamping force remains stable throughout the testing process and prevent testing errors or safety accidents caused by loosening. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the first working state of the rotary working arm of this utility model;

[0017] Figure 2 This is a schematic diagram of the second working state of the rotary working arm of this utility model;

[0018] Figure 3 This is a first-view structural diagram of the mounting bracket when the movable block of this utility model is not flipped.

[0019] Figure 4 This is a second-view structural schematic diagram of the mounting bracket when the movable block of this utility model is not flipped.

[0020] Figure 5 This is a structural schematic diagram of the mounting bracket from a first-view perspective when the movable block of this utility model is flipped.

[0021] Figure 6 This is a structural schematic diagram of the mounting bracket from a second perspective when the movable block of this utility model is flipped.

[0022] Figure 7 This is a schematic diagram of the structure of the rotary pressing assembly of this utility model;

[0023] Figure 8 This is a schematic diagram of the structure of the first adjustment component of this utility model.

[0024] In the diagram: 1. Workbench; 101. Slide rail; 2. Rotary working arm; 3. Bending mandrel; 4. Fixed clamp; 5. Moving clamp; 501. Mounting frame; 502. Rotating shaft; 503. Movable block; 6. Dial roller; 7. First adjustment assembly; 701. Moving groove; 702. Moving block; 703. Second lead screw; 8. Second adjustment assembly; 801. Fixed frame; 802. First lead screw; 9. Threaded connector; 901. Elastic element; 10. Rotary pressing assembly; 1001. Gear ring; 1002. Dial lever; 1003. Slot; 11. Linkage assembly; 1101. Connecting rod; 1102. Rack. Detailed Implementation

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, in part of which will be obvious from the description or may be learned by practice of the invention.

[0027] like Figures 1 to 8As shown, a steel pipe bending resistance testing device includes a workbench 1, a rotating working arm 2, and a roller 6. A bending mandrel 3 is fixedly installed on the top of the workbench 1. A fixed clamp 4 is fixedly installed on one end of the workbench 1 near the bending mandrel 3. A movable clamp 5 is provided on the side of the workbench 1 near the fixed clamp 4 to clamp the end of the steel pipe. A first adjusting component 7 for controlling the rotation of the roller 6 is provided on the rotating working arm 2. The movable clamp 5 includes a mounting frame 501 slidably installed on the top of the workbench 1 (a slide rail 101 is fixedly installed on the bottom of the mounting frame 501, and the mounting frame 501 has a groove corresponding to the slide rail 101). Two movable blocks 503 are rotatably provided on the side of the mounting frame 501 near the fixed clamp 4 via a rotating shaft 502. The two movable blocks 503 facing the fixed clamp 4 are combined to form a V-shape. The bending mandrel 3 and the fixed clamp 4 face the mounting frame 501. V-shaped support grooves are provided on both sides. The top of the workbench 1 is provided with a second adjustment component 8 for controlling the sliding of the mounting frame 501. The second adjustment component 8 includes a fixed frame 801 fixedly installed on the top of the workbench 1. A first lead screw 802 is rotatably provided near the top of the fixed frame 801 (a rotating hole is provided on the fixed frame 801 corresponding to the position of the first lead screw 802. The first lead screw 802 is connected to the rotating hole through a bearing. The bearing can reduce the friction when the first lead screw 802 rotates and improve the stability when the first lead screw 802 rotates). Two threaded connectors 9 are symmetrically and movably connected to the mounting frame 501 corresponding to the position of the first lead screw 802. Both ends of the mounting frame 501 are provided with a rotating pressing component 10 for controlling the two threaded connectors 9 to move closer to each other. Both movable blocks 503 are provided with a linkage component 11 for controlling the rotation of the rotating pressing component 10.

[0028] like Figures 5 to 7 As shown, the rotary pressing assembly 10 includes a gear ring 1001 rotatably mounted at the end of the mounting bracket 501, a lever 1002 fixedly mounted at both ends of the threaded connector 9, an elastic element 901 between the two threaded connectors 9, an elliptical groove 1003 opened at the center of the gear ring 1001, and the lever 1002 is formed with an arc surface at the position corresponding to the groove 1003.

[0029] like Figures 5 to 7As shown, the linkage assembly 11 includes a connecting rod 1101 fixedly mounted on the movable block 503. A rack 1102, meshing with the rack 1102, is fixedly mounted at one end of the connecting rod 1101 near the gear ring 1001. The rack 1102 is arc-shaped, and its center point is at the same position as the center point of the rotating shaft 502. When the movable clamp 5 slides towards one side of the fixed clamp 4, the two movable blocks 503 on the movable clamp 5 will contact the steel pipe beforehand. Then, influenced by their inclined surfaces, the two movable blocks 503 will swing around the rotating shaft 502. When the two movable blocks 503 swing, the connecting rod 1101 will rotate along with them. At this time, the meshing between the rack 1102 and the gear ring 1001 causes the gear ring 1001 to advance... As the gear ring 1001 rotates, the set slots 1003 and levers 1002 allow the two sets of levers 1002 to control the two threaded connectors 9 to move closer to each other (at this time, the elastic element 901 between the two threaded connectors 9 will bend under the influence of pressure), thereby causing the two threaded connectors 9 to "bite" the first lead screw 802, forming a dynamic mechanical lock. As the bending degree of the steel pipe increases, the pressure between the two movable blocks 503 and the steel pipe increases, and its turning torque increases synchronously, further strengthening the biting force between the two threaded connectors 9 and the lead screw, thus forming a pressure adaptive locking mechanism. This can ensure that the clamping force remains stable throughout the entire testing process, preventing testing errors or safety accidents caused by loosening.

[0030] like Figure 1 , Figure 2 and Figure 8 As shown, the first adjustment component 7 includes a movable groove 701 opened on the rotating working arm 2. A movable block 702 is slidably arranged inside the movable groove 701. A second lead screw 703 is rotatably arranged inside the movable groove 701 on the rotating working arm 2 (a rotating hole is opened on the rotating working arm 2 corresponding to the position of the second lead screw 703. The second lead screw 703 is connected to the rotating hole through a bearing. By utilizing the bearing, the friction force of the second lead screw 703 during rotation can be reduced, and the stability of the second lead screw 703 during rotation can be improved). The movable block 702 is threadedly connected to the second lead screw 703. The top end of the roller 6 is rotatably connected to the movable block 702. The roller 6 is hourglass-shaped. The V-shaped structure can automatically adapt to steel pipes of different diameters, reducing the time for changing fixtures or adjusting equipment and improving detection efficiency.

[0031] The work process is as follows:

[0032] S1: As Figure 1 , Figure 2 and Figure 5 As shown, during testing, one end of the steel pipe is placed between the moving clamp 5 and the fixed clamp 4, and then the first lead screw 802 is rotated to make the threaded connector 9 control the moving clamp 5 to slide to one side of the fixed clamp 4.

[0033] S2: As Figures 2 to 6 As shown, when the movable clamp 5 slides to one side of the fixed clamp 4, the two movable blocks 503 on the movable clamp 5 will contact the steel pipe in advance, and then the two movable blocks 503 will swing around the axis of the rotating shaft 502 due to the influence of its inclined surface.

[0034] S3: As Figures 3 to 7 As shown, when the two movable blocks 503 swing, the connecting rod 1101 will rotate along with them. At this time, the meshing between the rack 1102 and the gear ring 1001 will cause the gear ring 1001 to rotate.

[0035] S4: As Figures 3 to 7 As shown, when the gear ring 1001 rotates, the set slot 1003 and lever 1002 can be used to control the two threaded connectors 9 to move closer to each other (at this time, the elastic element 901 between the two threaded connectors 9 will bend under the influence of pressure), so that the two threaded connectors 9 "bite" the first lead screw 802, forming a dynamic mechanical lock.

[0036] S5: As Figure 1 , Figure 2 and Figure 8 As shown, after the moving clamp 5 is adjusted, the moving block 702 controls the roller 6 to fit with the steel pipe by rotating the second lead screw 703. At this time, the roller 6 is controlled by rotating the working arm 2 to perform a bending resistance test on the steel pipe.

[0037] S6: As the bending of the steel pipe deepens, the pressure between the two movable blocks 503 and the steel pipe increases, and the turning torque increases synchronously, further strengthening the biting force between the two threaded connectors 9 and the screw, thus forming a pressure adaptive locking mechanism, which can ensure that the clamping force remains stable throughout the entire testing process and prevent testing errors or safety accidents caused by loosening.

[0038] S7: After the steel pipe is inspected, the working arm 2 is reset and rotated. At this time, the first lead screw 802 is rotated in the opposite direction to allow the moving clamp 5 to slide in the opposite direction to the fixed clamp 4 (at this time, the elastic force of the elastic element 901 is restored, causing the two threaded connecting parts 9 to move away from each other, thereby causing the gear ring 1001 to rotate in the opposite direction). Then the steel pipe can be removed, and the bending resistance of the next steel pipe can be tested.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A device for testing the bending resistance of steel pipes, characterized in that: The device includes a worktable (1), a rotating working arm (2), and a roller (6). A bending mandrel (3) is fixedly installed on the top of the worktable (1). A fixed clamp (4) is fixedly installed on one end of the worktable (1) near the bending mandrel (3). A movable clamp (5) is provided on the side of the worktable (1) near the fixed clamp (4) to clamp the end of the steel pipe. A first adjustment component (7) for controlling the rotation of the roller (6) is provided on the rotating working arm (2). The movable clamp (5) includes a mounting bracket (501) slidably disposed on the top of the workbench (1). The mounting bracket (501) has two movable blocks (503) rotatably disposed on the side near the fixed clamp (4) via a rotating shaft (502). The top of the workbench (1) is provided with a second adjustment component (8) for controlling the sliding of the mounting bracket (501). The second adjustment component (8) includes a fixed frame (801) fixedly installed on the top of the workbench (1). The fixed frame (801) is rotatably provided with a first lead screw (802) near the top. The mounting frame (501) is symmetrically and movably connected with two threaded connectors (9) corresponding to the position of the first lead screw (802). Both ends of the mounting frame (501) are provided with a rotating pressing component (10) for controlling the two threaded connectors (9) to move closer to each other. Both movable blocks (503) are provided with a linkage component (11) for controlling the rotation of the rotating pressing component (10).

2. The steel pipe bending resistance testing device according to claim 1, characterized in that: Both the bending mandrel (3) and the fixed clamp (4) have V-shaped support grooves on the side facing the mounting bracket (501).

3. The steel pipe bending resistance testing device according to claim 2, characterized in that: The two movable blocks (503) facing the fixed clamp (4) combine to form a V-shape.

4. The steel pipe bending resistance testing device according to claim 1, characterized in that: The rotary pressing assembly (10) includes a gear ring (1001) rotatably disposed at the end of the mounting bracket (501), both ends of the threaded connector (9) are fixedly provided with levers (1002), an elastic element (901) is provided between the two threaded connectors (9), an elliptical groove (1003) is provided at the center of the gear ring (1001), and the levers (1002) are formed with arc surfaces at the positions corresponding to the grooves (1003).

5. The steel pipe bending resistance testing device according to claim 4, characterized in that: The linkage component (11) includes a connecting rod (1101) fixedly installed on the movable block (503), and a rack (1102) that meshes with the connecting rod (1101) is fixedly provided at one end near the gear ring (1001).

6. The steel pipe bending resistance testing device according to claim 5, characterized in that: The rack (1102) is arc-shaped, and the center point of the rack (1102) is at the same position as the center point of the rotating shaft (502).

7. The steel pipe bending resistance testing device according to claim 1, characterized in that: The workbench (1) is fixedly mounted with a slide rail (101) at the bottom of the mounting frame (501), and the mounting frame (501) has a groove that matches the slide rail (101) at the position corresponding to the slide rail (101).

8. The steel pipe bending resistance testing device according to claim 1, characterized in that: The first adjustment component (7) includes a moving groove (701) opened on the rotating working arm (2), a moving block (702) is slidably provided inside the moving groove (701), a second lead screw (703) is rotatably provided inside the moving groove (701) of the rotating working arm (2), the moving block (702) is threadedly connected to the second lead screw (703), the top end of the roller (6) is rotatably connected to the moving block (702), and the roller (6) is hourglass shaped.

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