A device for testing the mechanical properties of duplex stainless steel pipes

Abstract

This utility model discloses a mechanical property testing device for duplex stainless steel pipes, belonging to the field of steel pipe performance testing technology. It includes a base plate with a groove on one side, through which a movable support is slidably installed, and a fixed support is fixedly installed on the other side of the base plate; a tapered pipe end clamping member, rotatably mounted on the top of the movable and fixed supports; a rotation drive mechanism for driving the tapered pipe end clamping member on the fixed support to rotate; and a sliding drive mechanism for driving the movable support to slide along the groove. The key technical point is that the sliding drive mechanism can drive the movable support to move towards the end of the steel pipe to be fixed, thereby allowing the tapered pipe end clamping members on both sides to insert into both ends of the steel pipe and apply clamping force, thus completing the fixed installation of the steel pipe. Because the tapered pipe end clamping member is frustum-shaped, after clamping and fixing the steel pipe, it can ensure that its rotation axis coincides with the central axis of the steel pipe, preventing eccentric rotation of the steel pipe.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe performance testing technology, specifically a device for testing the mechanical properties of duplex stainless steel pipes. Background Technology

[0002] The significance of transverse pressure resistance testing for steel pipes lies in verifying their structural strength and stability under transverse loads (such as lateral pressure and bending stress). This test can simulate complex stress scenarios that steel pipes may encounter in actual engineering projects, such as pipes being compressed by soil, and building structures being subjected to wind loads or seismic forces. Through testing, the deformation resistance and damage resistance of steel pipes can be accurately assessed, preventing accidents such as pipe leaks and structural collapses caused by lateral instability, thus ensuring project safety. Simultaneously, the test results provide a scientific basis for steel pipe material selection, wall thickness design, and installation methods, helping to optimize structural performance, extend service life, and reduce maintenance costs, playing a crucial role in ensuring project reliability.

[0003] Utility model patent CN222979236U discloses a pressure resistance testing device for stainless steel pipes. Its structure includes a workbench, a movable seat on the top surface of the workbench, a rotating assembly inside the movable seat, a rotating ring fixedly connected to one side of the rotating assembly, an adjusting assembly connected to the bottom surface of the movable seat, and two sliding seats on the top surface of the workbench, with a testing assembly inside each sliding seat. This utility model, by incorporating the rotating assembly, allows the clamped steel pipe to be rotated during use. The rotated steel pipe can then be positioned relative to the pressure plate at different locations, enabling testing of different surfaces of the steel pipe. Furthermore, this process eliminates the need for prior contact with the fixed state of the steel pipe, greatly increasing the convenience of the testing process.

[0004] While the aforementioned testing equipment can perform pressure tests at different positions by rotating the steel pipe through the moving component, the installation of the steel pipe involves inserting both ends into the positioning rings and then pressing and fixing the pipe ends by the lower pressure plate. This installation method results in the axis of the fixed steel pipe not coinciding with the axis of the rotating rod. Consequently, when the steel pipe is rotated to change its orientation, the rotation is eccentric. This means that the steel pipe will separate from the arc groove after rotating at any angle, causing the arc groove to fail to provide support for the steel pipe. This results in the steel pipe being subjected to bending moment while under pressure, leading to different working conditions when testing the pressure resistance of the steel pipe at different positions. Due to the changing test conditions, the test results of the same batch cannot be compared. It is still necessary to repeatedly disassemble and reassemble the steel pipe to ensure that the steel pipe is in contact with the arc groove during each test. Therefore, to address the above problems, a mechanical property testing device for duplex stainless steel pipes is proposed. Utility Model Content

[0005] To address the technical problem in comparative techniques where rotating a steel pipe to change its pressure position alters the testing conditions due to eccentric rotation, making direct comparison of test results from the same batch impossible, this invention provides a mechanical property testing device for duplex stainless steel pipes.

[0006] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0007] A mechanical property testing device for duplex stainless steel pipes includes a base plate with a groove on one side for a movable support slidably mounted therein, and a fixed support fixedly mounted on the other side of the base plate; a tapered pipe end clamping member rotatably mounted on the top of the movable and fixed supports, with both ends of the steel pipe to be clamped sleeved on the tapered pipe end clamping member; a rotation drive mechanism for driving the tapered pipe end clamping member on the fixed support to rotate; a sliding drive mechanism for driving the movable support to slide along the groove; and a pressure testing frame for applying pressure to the steel pipe; wherein the tapered pipe end clamping member includes an end plate, one end of which is fixedly connected to a rotating shaft, and the other end is fixedly connected to an installation rod, with a frustum-shaped cylinder sleeved on the installation rod.

[0008] In one possible implementation, the frustum tube includes a bone tube, to which a frustum sleeve is fixedly fitted. The inner wall of the bone tube is fixedly provided with a plurality of locking ridges arranged in a circumferential array, and the mounting rod is provided with locking grooves corresponding to the locking ridges.

[0009] In one possible implementation, the surface of the frustum sleeve is fixedly provided with a number of anti-slip protrusions arranged in a circumferential array.

[0010] In one possible implementation, the rotation drive mechanism includes a drive motor fixedly mounted on a fixed bracket, and also includes a drive wheel and a transmission wheel. The drive wheel is fixedly mounted on the output shaft end of the drive motor, and the transmission wheel is fixedly mounted on the end of the rotating shaft. The drive wheel and the transmission wheel are connected by a transmission belt.

[0011] In one possible implementation, the sliding drive mechanism includes a slider that is slidably disposed in a groove, and a second drive motor mounted on the end of the base plate, wherein the output shaft of the second drive motor is fixedly connected to a drive screw that is threadedly connected to the slider.

[0012] In one possible implementation, guide ridges are fixedly provided on the inner walls of both sides of the slide groove, and guide grooves corresponding to the guide ridges are opened on both sides of the slider.

[0013] In one possible implementation, the pressure test frame includes a support frame on which two vertically arranged frame plates are fixedly mounted. Symmetrically arranged hydraulic cylinders are mounted on the frame plates, and arc-shaped pressure plates are fixedly connected to the shaft ends of the hydraulic cylinders.

[0014] In summary, this utility model has the following beneficial technical effects:

[0015] The sliding drive mechanism can drive the movable bracket to move towards the end of the steel pipe to be fixed, so that the tapered pipe end clamps on both sides can be inserted into the two ends of the steel pipe and apply clamping force to complete the fixed installation of the steel pipe. Since the tapered pipe end clamps are frustum-shaped, after clamping and fixing the steel pipe, it can ensure that the central axis of its rotation coincides with the central axis of the steel pipe. This ensures that when the rotation drive mechanism drives the tapered pipe end clamps to rotate and drives the steel pipe to rotate, the steel pipe will not rotate eccentrically. This ensures that the test conditions of the steel pipe are basically the same at all positions when it is pressurized by the pressure test frame during testing, so that the test conditions can be kept constant during multiple continuous tests.

[0016] Among them, the tapered tube end clamping component, whose main clamping function is the frustum-shaped tube, can be detachably sleeved on the mounting rod. Therefore, the corresponding size frustum-shaped tube can be replaced according to the different sizes of steel pipes to complete the clamping and fixing of steel pipes of various sizes, which can significantly broaden the application range of the device. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partial structural diagram of the present invention. Figure 1 ;

[0020] Figure 3 This is a partial structural diagram of the present invention. Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the tapered tube end clamping component of this utility model;

[0022] Figure 5 This is a schematic diagram of the pressure test frame structure of this utility model.

[0023] In the diagram: 1. Base plate; 11. Slide groove; 2. Fixed bracket; 3. Movable bracket; 4. Conical tube end clamp; 41. End plate; 42. Rotating shaft; 43. Mounting rod; 431. Slot; 44. Frustum tube; 441. Bone tube; 442. Frustum sleeve; 443. Clamping edge; 444. Anti-slip protrusion; 5. Rotation drive mechanism; 51. Drive motor one; 52. Drive wheel; 53. Transmission wheel; 54. Transmission belt; 6. Sliding drive mechanism; 61. Slider; 62. Drive screw; 63. Drive motor two; 64. Guide edge; 65. Guide groove; 7. Pressure test frame; 71. Support frame; 72. Frame plate; 73. Hydraulic cylinder; 74. Arc-shaped pressure plate. Detailed Implementation

[0024] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0025] like Figure 1 As shown, this embodiment provides a mechanical property testing device for duplex stainless steel pipes, including a base plate 1 with a groove 11 on one side, in which a movable support 3 is slidably installed, and a fixed support 2 is fixedly installed on the other side of the base plate 1; a tapered pipe end clamping member 4, which is rotatably installed on the top of the movable support 3 and the fixed support 2, and the two ends of the steel pipe to be clamped are sleeved on the tapered pipe end clamping member 4; a rotation drive mechanism 5, which is used to drive the tapered pipe end clamping member 4 on the fixed support 2 to rotate; a sliding drive mechanism 6, which is used to drive the movable support 3 to slide along the groove 11; and a pressure testing frame 7, which is used to apply pressure to the steel pipe.

[0026] Based on the above structural scheme, the sliding drive mechanism 6 can drive the movable bracket 3 to move towards the end of the steel pipe to be fixed, so that the tapered pipe end clamps 4 on both sides can be inserted into both ends of the steel pipe and apply clamping force, thereby completing the fixed installation of the steel pipe. Since the tapered pipe end clamps 4 are frustum-shaped, after clamping and fixing the steel pipe, it can ensure that the central axis of its rotation coincides with the central axis of the steel pipe. When the rotation drive mechanism 5 drives the tapered pipe end clamps 4 to rotate and drive the steel pipe to rotate, the steel pipe will not rotate eccentrically. This ensures that the test conditions of the steel pipe are basically the same when it is pressurized by the pressure test frame 7 at each position during the test, so that the test conditions can be kept constant during multiple continuous tests.

[0027] Among them, such as Figure 4 As shown, the tapered tube end clamping member 4 includes an end plate 41, one end of which is fixedly connected to a rotating shaft 42, and the other end is fixedly connected to an installation rod 43. A frustum-shaped tube 44 is sleeved on the installation rod 43. Since the frustum-shaped tube 44, which plays the main clamping role, can be detachably sleeved on the installation rod 43, the corresponding size of the frustum-shaped tube 44 can be replaced according to the different sizes of steel pipes to complete the clamping and fixing of steel pipes of various sizes, which can significantly broaden the application range of the device.

[0028] In the above scheme, to ensure a stable connection between the frustum cylinder 44 and the mounting rod 43 and to transmit a large torque, such as Figure 4 As shown, the frustum tube 44 includes a bone tube 441, which is fixedly sleeved with a frustum sleeve 442. The inner wall of the bone tube 441 is fixedly provided with a plurality of locking ridges 443 arranged in a circumferential array. The mounting rod 43 is provided with a slot 431 corresponding to the locking ridges 443. Through the locking action between the locking ridges 443 and the slots 431, the frustum tube 44 and the mounting rod 43 can be detachably connected while ensuring the stability of the connection. It can also enable the connection to bear a large torque without slippage.

[0029] In addition, to improve the friction between the steel pipe and the frustum sleeve 44 and prevent slippage, several anti-slip ridges 444 are fixedly arranged in a circumferential array on the surface of the frustum sleeve 442. The anti-slip ridges 444 can tightly fit with the inner wall of the steel pipe and generate extrusion deformation, thereby enhancing the friction between the frustum sleeve 442 and the inner wall of the steel pipe.

[0030] like Figure 2 As shown, the rotation drive mechanism 5 includes a drive motor 51 fixedly mounted on the fixed bracket 2, a drive wheel 52 and a transmission wheel 53. The drive wheel 52 is fixedly mounted on the output shaft end of the drive motor 51, and the transmission wheel 53 is fixedly mounted on the end of the rotating shaft 42. The drive wheel 52 and the transmission wheel 53 are connected by a transmission belt 54. When it is necessary to rotate the steel pipe to change its pressure position, the drive motor 51 drives the drive wheel 52 to rotate. When the drive wheel 52 rotates, it can drive the transmission wheel 53 to rotate through the transmission belt 54, thereby driving the tapered pipe end clamp 4 to rotate, thus driving the steel pipe to rotate and change its orientation.

[0031] like Figure 3 As shown, the sliding drive mechanism 6 includes a slider 61 slidably disposed in the slide groove 11 and a second drive motor 63 mounted on the end of the base plate 1. The output shaft of the second drive motor 63 is fixedly connected to a drive screw 62 threadedly connected to the slider 61. When the second drive motor 63 is working, it can drive the drive screw 62 fixedly connected to it to rotate, thereby driving the threaded slider 61 to slide in the slide groove 11, thereby driving the movable bracket 3 fixedly connected to the slider 61 to slide and change its position. In addition, in order to improve the stability of the connection between the slider 61 and the slide groove 11, guide ribs 64 are fixedly provided on both sides of the inner wall of the slide groove 11, and guide grooves 65 corresponding to the guide ribs 64 are opened on both sides of the slider 61. The above structural solution can improve the stability of the connection between the slider 61 and the slide groove 11 through the sliding engagement of the guide ribs 64 and the guide grooves 65, and avoid deviation during the sliding process.

[0032] like Figure 5As shown, the pressure test frame 7 includes a support frame 71 on which two vertically arranged frame plates 72 are fixedly installed. Symmetrically arranged hydraulic cylinders 73 are installed on the frame plates 72. An arc-shaped pressure plate 74 is fixedly connected to the shaft end of the hydraulic cylinder 73. Based on the above scheme, the symmetrically arranged hydraulic cylinders 73 can drive the connected arc-shaped pressure plate 74 to move closer or further away simultaneously, thereby ensuring that the arc-shaped pressure plate 74 can simultaneously adhere to the outer wall of the steel pipe when pressurized, so that the steel pipe will not be subjected to bending moment when pressure is applied, thus ensuring the accuracy of its pressure resistance test results.

[0033] The working principle and usage process of this utility model:

[0034] When installing the steel pipe, one end is fitted onto the tapered pipe end clamp 4, and then it is lifted as horizontally as possible. The sliding drive mechanism 6 is controlled to work, so that the sliding drive mechanism 6 can drive the movable bracket 3 to move towards the end of the steel pipe to be fixed, so that the tapered pipe end clamp 4 on it can be inserted into the end of the steel pipe and work with the tapered pipe end clamp 4 at the other end to apply clamping force, thereby completing the fixed installation of the steel pipe. Since the tapered pipe end clamp 4 is frustum-shaped, after clamping and fixing the steel pipe, it can ensure that its rotation axis coincides with the central axis of the steel pipe, so that the steel pipe will not rotate eccentrically.

[0035] During testing, the symmetrically arranged hydraulic cylinders 73 can drive the connected arc-shaped pressure plates 74 to move closer or further away simultaneously, thereby ensuring that the arc-shaped pressure plates 74 can simultaneously adhere to the outer wall of the steel pipe when pressurized, so that the steel pipe will not be subjected to bending moment when pressurized, thus ensuring the accuracy of its pressure resistance test results.

[0036] In addition, when it is necessary to adjust the pressure position of the steel pipe, the drive motor 51 drives the drive wheel 52 to rotate. When the drive wheel 52 rotates, it can drive the transmission wheel 53 to rotate through the transmission belt 54, thereby driving the tapered pipe end clamp 4 to rotate, thus driving the steel pipe to rotate and change its orientation.

[0037] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for detecting mechanical properties of a duplex stainless steel pipe, characterized by, include: The base plate (1) has a sliding groove (11) on one side, in which a movable bracket (3) is slidably installed, and a fixed bracket (2) is fixedly installed on the other side of the base plate (1); The tapered pipe end clamp (4) is rotatably mounted on the top of the movable bracket (3) and the fixed bracket (2), and the two ends of the steel pipe to be clamped are sleeved on the tapered pipe end clamp (4); Rotation drive mechanism (5) is used to drive the tapered tube end clamp (4) on the fixed bracket (2) to rotate; A sliding drive mechanism (6) is used to drive the movable support (3) to slide along the slide groove (11); A pressure test fixture (7) is used to apply pressure to the steel pipe; The tapered tube end clamp (4) includes an end plate (41), one end of which is fixedly connected to a rotating shaft (42), and the other end is fixedly connected to an installation rod (43), on which a frustum tube (44) is sleeved.

2. The device for detecting mechanical properties of duplex stainless steel pipe according to claim 1, characterized in that: The frustum tube (44) includes a bone tube (441), which is fixedly fitted with a frustum sleeve (442). The inner wall of the bone tube (441) is fixedly provided with a plurality of locking ridges (443) arranged in a circumferential array. The mounting rod (43) is provided with a locking groove (431) corresponding to the locking ridges (443).

3. The device for testing the mechanical properties of duplex stainless steel pipes according to claim 2, characterized in that: The surface of the frustum sleeve (442) is fixedly provided with several anti-slip protrusions (444) arranged in a circumferential array.

4. The device for testing the mechanical properties of duplex stainless steel pipes according to claim 1, characterized in that: The rotation drive mechanism (5) includes a drive motor (51) fixedly mounted on a fixed bracket (2), and also includes a drive wheel (52) and a transmission wheel (53). The drive wheel (52) is fixedly mounted on the output shaft end of the drive motor (51), and the transmission wheel (53) is fixedly mounted on the end of the rotating shaft (42). The drive wheel (52) and the transmission wheel (53) are connected by a transmission belt (54).

5. The device for testing the mechanical properties of duplex stainless steel pipes according to claim 1, characterized in that: The sliding drive mechanism (6) includes a slider (61) slidably disposed in the slide groove (11) and a second drive motor (63) installed at the end of the base plate (1). The output shaft end of the second drive motor (63) is fixedly connected to a drive screw (62) threadedly connected to the slider (61).

6. The mechanical property testing device for duplex stainless steel pipes according to claim 5, characterized in that: Guide ribs (64) are fixedly provided on both sides of the inner wall of the slide groove (11), and guide grooves (65) corresponding to the guide ribs (64) are opened on both sides of the slider (61).

7. The device for testing the mechanical properties of duplex stainless steel pipes according to claim 1, characterized in that: The pressure test frame (7) includes a support frame (71). Two frame plates (72) arranged vertically are fixedly installed on the support frame (71). Hydraulic cylinders (73) are symmetrically arranged on the frame plates (72). Arc-shaped pressure plates (74) are fixedly connected to the shaft ends of the hydraulic cylinders (73).

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