Bending test device for large-size welded steel pipe

Abstract

The utility model relates to a bending test device for a large-size welded steel pipe, which comprises a base, mounting racks are fixedly arranged on the base in a bilateral symmetry manner, lower support rollers are rotatably connected onto the mounting racks, vertical plates are fixedly arranged on the base in a bilateral symmetry manner, and lower support rollers are rotatably connected onto the vertical plates. Two positioning rods swinging up and down are arranged on the opposite sides of the two vertical plates correspondingly, positioning rollers are symmetrically arranged above the lower supporting rollers in the front-back direction, a mounting base is fixedly arranged on the rear side of the base, an extrusion mechanism is mounted on the mounting base, and the two positioning rods swing downwards synchronously. If the bent pipe is deviated, the positioning rods push the deviated and tilted ends downwards until the two positioning rods can abut against the left end and the right end of the bent pipe, so that the left-right position of the bent pipe is corrected, and the situation that the bent pipe deviates leftwards and rightwards, and the accuracy of a test result is affected is avoided.

Description

Technical Field

[0001] This utility model relates to steel pipes, and in particular to a bending test device for large-size welded steel pipes. Background Technology

[0002] To ensure the steel pipes meet strength requirements and prevent structural collapse in practical applications, a bending resistance test is required after production. Steel pipes include straight and bent pipes. Current testing methods typically involve continuous compression of the middle section of the pipe, with the degree of deformation determining its bending resistance. However, because bent pipes have a certain curvature, their position can easily shift during compression, preventing the compression mechanism from reaching the pre-set compression points and leading to deviations in test results.

[0003] To address the above issues, we propose a bending test device for large-size welded steel pipes. Utility Model Content

[0004] This invention proposes a bending test device for large-size welded steel pipes, which solves the above-mentioned problems existing in the use of existing technologies.

[0005] The technical solution of this utility model is implemented as follows: a bending test device for large-size welded steel pipe includes a base, on which mounting frames are symmetrically fixed on the left and right, and each mounting frame is rotatably connected to a lower support roller. Vertical plates are symmetrically fixed on the base, and two positioning rods that swing up and down are respectively arranged on the opposite side of the two vertical plates. A first driving mechanism for driving the positioning rods is provided on the base.

[0006] Each of the lower support rollers is symmetrically provided with positioning rollers above it, and a second drive mechanism for driving the positioning rollers is provided inside the base.

[0007] A mounting base is fixed to the rear side of the base, and a pressing mechanism is installed on the mounting base.

[0008] A further feature of this invention is that: each of the two upright plates is symmetrically provided with connecting plates on one side facing each other, and a rotating shaft is rotatably connected between the two connecting plates on the same side, and the positioning rod is fixed on the rotating shaft;

[0009] A rotary cylinder for driving the rotating shaft is mounted on the connecting plate on the rear side.

[0010] A further feature of this invention is that the second drive mechanism includes two positive and negative threaded rods, and the base has symmetrically provided mounting slots on the left and right sides, with the two positive and negative threaded rods respectively rotatably connected to the two mounting slots;

[0011] An external frame is fixedly provided on the rear side of the base, and the rear ends of the two positive and negative threaded rods are rotatably connected to the external frame. A servo motor for driving the positive and negative threaded rods is installed on the external frame.

[0012] Synchronous pulleys are fixed on both the forward and reverse threaded screws, and a synchronous belt connects the two synchronous pulleys together.

[0013] A further feature of this invention is that each of the positive and negative threaded rods is symmetrically connected to a slide block, an extension plate is fixedly provided on the upper side of the slide block, and the positioning roller is fixedly connected to the extension plate.

[0014] A further feature of this invention is that the extrusion mechanism includes an extrusion head that moves up and down, a horizontal plate is fixedly provided on the upper side of the mounting base, a second cylinder for driving the extrusion head is mounted on the horizontal plate, and a pressure sensor is installed between the piston rod end of the second cylinder and the extrusion head.

[0015] A further feature of this invention is that a scale is drawn on the front side of the mounting base;

[0016] A laser emitter is mounted on the upper side of the extrusion head.

[0017] A further feature of this invention is that the left and right sidewalls of the slide block abut against the left and right sidewalls of the mounting groove.

[0018] In summary, the beneficial effects of this utility model are as follows:

[0019] After the technicians place the bent tube on the upper edge of the two lower support rollers, the two positioning rollers on the same side move synchronously and approach each other until they abut against the front and rear sides of the bent tube, thereby correcting the front and rear position of the bent tube and avoiding the front and rear displacement of the bent tube, which would affect the accuracy of the test results.

[0020] The two positioning rods swing downwards synchronously. If the left and right positions of the bend are offset, the positioning rods will push the offset end downwards until both positioning rods can abut against the left and right ends of the bend, thereby correcting the left and right positions of the bend and preventing the bend from shifting to the left and right, which would affect the accuracy of the test results. Attached Figure Description

[0021] 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.

[0022] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0024] Figure 3 for Figure 1 A schematic diagram of the structure from another perspective.

[0025] The following are the labeling elements in the diagram: 11. Base; 12. Mounting frame; 13. Lower support roller; 14. Positioning rod; 15. Positioning roller; 16. Mounting seat; 17. Vertical plate; 18. Connecting plate; 19. Rotating shaft; 20. Positive and negative threaded rods; 21. Mounting groove; 22. External frame; 23. Servo motor; 24. Synchronous pulley; 25. Synchronous belt; 26. Slide; 27. Extension plate; 29. ​​Extrusion head; 30. Cylinder No. 2; 31. Pressure sensor; 32. Scale; 33. Laser emitter; 34. Rotating cylinder; 35. Horizontal plate. Detailed Implementation

[0026] The following will refer to the appendix in the embodiments of this utility model. Figure 1-3 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Example:

[0028] like Figures 1 to 3 As shown, a bending test device for large-size welded steel pipe includes a base 11, on which mounting frames 12 are symmetrically fixed. Each mounting frame 12 is rotatably connected to a lower support roller 13. Vertical plates 17 are symmetrically fixed on the base 11. Connecting plates 18 are symmetrically arranged on the facing surfaces of the two vertical plates 17. A rotating shaft 19 is rotatably connected between the two connecting plates 18 on the same side. A rotating cylinder 34 for driving the rotating shaft 19 is installed on the rear connecting plate 18. A positioning rod 14 is fixed on the rotating shaft 19.

[0029] Furthermore, the base 11 has symmetrical mounting slots 21 on the left and right sides. Two synchronously rotating forward and reverse threaded rods 20 are rotatably connected in the mounting slots 21. The working principle of the synchronous rotation of the two forward and reverse threaded rods 20 is as follows: an external frame 22 is fixedly provided on the rear side of the base 11. The rear ends of the two forward and reverse threaded rods 20 are rotatably connected in the external frame 22. A servo motor 23 for driving the forward and reverse threaded rods 20 is installed on the external frame 22. A synchronous pulley 24 is fixedly provided on each forward and reverse threaded rod 20. A synchronous belt 25 is connected between the two synchronous pulleys 24. When the servo motor 23 drives the forward and reverse threaded rod 20 on one side to rotate, the forward and reverse threaded rod 20 drives the forward and reverse threaded rod 20 on the other side to rotate synchronously through the synchronous belt 25.

[0030] Furthermore, each of the positive and negative threaded rods 20 is symmetrically connected with a slide block 26. An extension plate 27 is fixedly provided on the upper side of the slide block 26, and a positioning roller 15 is fixedly connected to the extension plate 27. The left and right side walls of each slide block 26 respectively abut against the left and right side walls of the mounting groove 21 on the same side, thereby limiting the slide block 26 to ensure that the slide block 26 can only move horizontally back and forth.

[0031] In addition, a mounting base 16 is fixedly provided on the rear side of the base 11, and a pressing mechanism is installed on the mounting base 16.

[0032] Before the test begins, the rotating cylinder 34 drives the two positioning rods 14 to swing upwards synchronously, and moves the positioning rollers 15 on the front and rear sides away from each other. Then, the technician places the bent tube with its concave side facing upwards on the upper edge of the two lower support rollers 13, and moves the positioning rollers 15 on the front and rear sides closer to each other until the curved sidewalls of the positioning rollers 15 abut against the surface of the bent tube, thereby correcting the front and rear position of the bent tube. Then, the two positioning rods 14 swing downwards synchronously. If the left and right position of the bent tube deviates, the deviated and upward-curved end will swing downwards under the push of the positioning rod 14 on the same side until the lower edges of the positioning rods 14 on both sides can abut against the left and right ends of the bent tube. This indicates that the left and right position of the bent tube has been corrected, and the center part of the bent tube is located directly below the extrusion mechanism.

[0033] The specific structure of the extrusion mechanism is as follows: the extrusion mechanism includes an extrusion head 29 that moves up and down (the extrusion head is a column that can extend axially back and forth), a horizontal plate 35 is fixed on the upper side of the mounting base 16, a second cylinder 30 for driving the extrusion head 29 is installed on the horizontal plate 35, a pressure sensor 31 that can transmit signals to the control platform (not shown in the figure) is installed between the piston rod end of the second cylinder 30 and the extrusion head 29, and a scale 32 is drawn on the front side of the mounting base 16, and a laser emitter 33 is installed on the upper side of the extrusion head 29.

[0034] After the position of the bend is corrected, the two positioning rods 14 swing upward and no longer contact the bend, and the positioning rollers 15 on the front and rear sides move slightly away to avoid clamping the bend during the test, thereby reducing friction and ensuring the accuracy of the test results. Before the test officially begins, the laser emitter 33 emits a laser towards the scale 32. The technician records the scale corresponding to the laser at this time, and moves the extrusion head 29 downward to continuously extrude pressure on the center part of the bend. After the bend is deformed by the extrusion head 29, the extrusion head 29 stops extruding downward. At this time, the technician records the scale reading aligned with the laser emitted by the laser emitter 33 again. The technician records the pressure value transmitted by the pressure sensor 31 through the control platform, as well as the degree of deformation of the bend reflected by the difference in scale readings before and after the test, to determine whether the bending resistance performance of the bend is qualified.

[0035] It should be noted that the functions to be achieved by the pressure sensor 31 and the laser emitter 33 in this embodiment are supported by a large number of mature technologies. The essence of this utility model is to optimize and combine the existing hardware connection methods for specific application scenarios in order to adapt to the solution of how to test the bending resistance of the pipe (without changing the internal structure of the pressure sensor 31 and the laser emitter 33).

[0036] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bending test apparatus for large-sized welded steel pipes, comprising a base (11), characterized in that: The bottom (11) is symmetrically provided with a mounting frame (12), the mounting frame (12) is rotatably connected with a lower supporting roller (13), the bottom (11) is symmetrically provided with a vertical plate (17), the vertical plate (17) is provided with two positioning rods (14) which are arranged in an up-down swing mode, and the bottom (11) is provided with a first driving mechanism for driving the positioning rod (14); The upper side of each lower supporting roller (13) is provided with a positioning roller (15) in a front-rear symmetrical mode, and the bottom (11) is provided with a second driving mechanism for driving the positioning roller (15); The rear side of the bottom (11) is fixedly provided with a mounting seat (16), and the mounting seat (16) is provided with an extrusion mechanism.

2. A device for testing the bending of a large-sized welded steel pipe according to claim 1, characterized in that: The front-rear side of each vertical plate (17) is provided with a connecting plate (18), and the left-right side connecting plates (18) are rotatably connected with a rotating shaft (19), and the positioning rod (14) is fixedly arranged on the rotating shaft (19); The rear side of the connecting plate (18) is provided with a rotating cylinder (34) for driving the rotating shaft (19).

3. The apparatus for testing the bending of a large-sized welded steel pipe according to claim 1, wherein: The second driving mechanism comprises two positive and negative toothed rods (20), the bottom (11) is provided with two mounting grooves (21) in a left-right symmetrical mode, and the two positive and negative toothed rods (20) are rotatably connected with the two mounting grooves (21) respectively; The rear side of the bottom (11) is fixedly provided with an external frame (22), and the rear side of the positive and negative toothed rod (20) is rotatably connected with the external frame (22), and the external frame (22) is provided with a servo motor (23) for driving the positive and negative toothed rod (20); The positive and negative toothed rod (20) is fixedly provided with a synchronous wheel (24), and the two synchronous wheels (24) are connected with a synchronous belt (25).

4. A device for testing the bending of a large-sized welded steel pipe according to claim 3, characterized in that: The positive and negative toothed rod (20) is provided with a sliding seat (26) in a front-rear symmetrical mode, the upper side of the sliding seat (26) is fixedly provided with an extension plate (27), and the positioning roller (15) is fixedly connected with the extension plate (27).

5. The apparatus for testing the bending of a large-sized welded steel pipe according to claim 1, wherein: The extrusion mechanism comprises an extrusion head (29) which moves up and down, the upper side of the mounting seat (16) is fixedly provided with a horizontal plate (35), the horizontal plate (35) is provided with a second cylinder (30) for driving the extrusion head (29), and the piston rod of the second cylinder (30) is connected with the extrusion head (29) and provided with a pressure sensor (31).

6. A device for testing the bending of a large-sized welded steel pipe according to claim 5, characterized in that: The front side of the mounting seat (16) is provided with a scale table (32); The upper side of the extrusion head (29) is provided with a laser emitter (33).

7. The apparatus for testing the bending of a large-sized welded steel pipe according to claim 4, wherein: The left-right side walls of the sliding seat (26) are abutted with the left-right side walls of the mounting groove (21).

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