Variable-size umbilical cable steel pipe bending fatigue test device

Abstract

The utility model relates to the technical field of umbilical cable steel pipe testing, and discloses a variable-size umbilical cable steel pipe bending fatigue test device which comprises an upper bottom plate, the lower bottom plates are symmetrically arranged below the upper bottom plate; the upper bottom plate and the lower bottom plate are each provided with two symmetrically-arranged adjusting mechanisms. The four adjusting mechanisms are all arranged between the upper bottom plate and the lower bottom plate, and the two upper adjusting mechanisms are arranged between the two lower adjusting mechanisms. A clamping mechanism is arranged on the adjusting mechanism, the adjusting mechanism comprises an L-shaped tool plate, and two axial adjusting grooves are symmetrically formed in each of the upper bottom plate and the lower bottom plate. A modular design is adopted, a bending fatigue test of a multi-size test piece is realized by replacing and changing the size of a round hole of a four-point clamping piece, compared with a previous test device, the test device is higher in applicability and more convenient to mount and dismount, and the test efficiency is improved by changing the axial position of an L-shaped tool plate and adjusting the four-point clamping distance. And four-point bending fatigue test requirements with different spacing requirements can be met.

Description

Technical Field

[0001] This utility model relates to the field of umbilical cable steel pipe testing technology, specifically a bending fatigue testing device for variable-size umbilical cable steel pipes. Background Technology

[0002] Umbilical cables serve as the transmission link for power, control, and hydraulics in subsea production systems and are widely used in the offshore oil and gas development industry. The structure of an umbilical cable typically comprises a combination of various functional components, including steel pipes, electrical cables, and optical fibers. Among these, the steel pipe, as a crucial functional and load-bearing component, is usually made of super duplex stainless steel and is used to transmit hydraulic control fluids and chemicals to subsea production facilities. During manufacturing, transportation, and installation, umbilical cables inevitably undergo reciprocating bending at locations such as winch drums and pulleys, and their bending radius may be lower than the minimum design bending radius, causing plastic deformation of the steel pipe during bending. Plastic deformation affects the mechanical properties of the steel pipe, especially at weld seams. When plastic deformation accumulates to a certain extent, it can lead to low-cycle fatigue failure of the steel pipe. Therefore, it is necessary to simulate the strain accumulation process of the steel pipe throughout the entire manufacturing, installation, and operation of the umbilical cable, assess the steel pipe's ability to withstand accumulated plastic strain, and evaluate the possibility of failure due to defects in the steel pipe during the manufacturing process.

[0003] Currently, existing testing devices for low-cycle fatigue of umbilical cable steel pipes are generally applicable to axial loading, but do not address bending loading. Furthermore, since a single umbilical cable contains steel pipes of various sizes, conventional bending loading devices (especially four-point bending loading devices) suffer from poor versatility, limited test size coverage, and difficulty in adjusting the loading position. To address these issues, a variable-size umbilical cable steel pipe bending fatigue testing device is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a variable-size umbilical cable steel pipe bending fatigue testing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a variable-size umbilical cable steel pipe bending fatigue testing device, including an upper base plate;

[0006] And a lower base plate symmetrically arranged below the upper base plate;

[0007] Two symmetrically arranged adjustment mechanisms are installed on both the upper and lower base plates;

[0008] All four adjustment mechanisms are located between the upper base plate and the lower base plate, with the two upper adjustment mechanisms located between the two lower adjustment mechanisms;

[0009] The adjusting mechanism is provided with a clamping mechanism;

[0010] The lower bottom plate is fixed by a loading device, and the upper bottom plate is subjected to reciprocating cyclic loading, so as to realize reciprocating bending loading of the steel pipe sample.

[0011] Preferably, the adjusting mechanism comprises an L-shaped tool plate, two axial adjusting grooves are symmetrically arranged on the upper bottom plate and the lower bottom plate, two groups of positioning holes are arranged on the surface of the L-shaped tool plate corresponding to the two axial adjusting grooves on one side, and adjusting bolts are arranged on the outer sides of the upper bottom plate and the lower bottom plate.

[0012] Preferably, one end of the adjusting bolt extends into the corresponding positioning hole through the corresponding axial adjusting groove and is threadedly connected with the inner wall of the positioning hole, the inner side surface of the adjusting bolt at the top is clamped with the surface of the upper bottom plate, and the inner side surface of the adjusting bolt at the bottom is clamped with the surface of the lower bottom plate.

[0013] Preferably, the clamping mechanism comprises a clamping base, and a deflection groove is arranged through the vertical end surface of the L-shaped tool plate, and the clamping base is horizontally arranged on the inner side of the deflection groove.

[0014] Preferably, a clamping T-shaped plate is arranged in the deflection groove, and the clamping T-shaped plate is horizontally arranged on one side of the clamping base.

[0015] Preferably, clamping arc grooves are arranged through the left and right sides of the clamping base, the protruding end of the clamping T-shaped plate extends into the clamping arc groove, the surface of the clamping T-shaped plate is in extrusion contact with the surface of the clamping base, clamping arc grooves are arranged through the left and right sides of the protruding end of the clamping T-shaped plate, and the inner walls of the clamping arc grooves form a clamping circular hole with the inner walls of the clamping arc grooves.

[0016] Preferably, deflection columns are interference-fitted on the front and rear sides of the clamping base, deflection through holes are arranged through the inner walls of the front and rear ends of the deflection groove corresponding to the positions of the two deflection columns, and the outer ends of the deflection columns extend into the corresponding deflection through holes and are rotationally connected with the inner walls of the deflection through holes.

[0017] The clamping T-shaped plate and the clamping base are fixed by mounting bolts, so as to fix the steel pipe sample, and the deflection column is hinged with the L-shaped tool plate, so as to release the rotation constraint of the steel pipe sample in the bending process.

[0018] Preferably, the clamping T-shaped plate is vertically provided with a mounting bolt outside, one end of the mounting bolt is sequentially penetrated through the clamping T-shaped plate and the clamping base, the inner side surface of the mounting bolt is in clamping connection with the surface of the clamping T-shaped plate, and the surface of the mounting bolt is in threaded connection with the inner wall of the clamping base; for different sizes of steel pipes inside the umbilical cable, the size of the clamping circular hole can be changed by disassembling the deflection column and replacing the clamping base and the clamping T-shaped plate of different sizes after the test of each sample is completed, so that the steel pipe sample of different sizes is adapted.

[0019] Compared with the prior art, the umbilical cable steel pipe bending fatigue test device with variable size has the beneficial effects that,

[0020] 1) The modular design is adopted, the bending fatigue test of the test piece of multiple sizes is realized by replacing and changing the size of the circular hole of the four-point clamping piece, the applicability is stronger than that of the previous test device, and the installation and disassembly are more convenient;

[0021] 2) The four-point bending fatigue test requirements of different spacing requirements can be met by changing the axial position of the L-shaped tool plate and adjusting the spacing of the four-point clamping. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole structure perspective schematic view of the utility model;

[0023] Figure 2 It is a upper bottom plate structure perspective schematic view of the utility model;

[0024] Figure 3 It is a adjusting mechanism structure perspective explosion schematic view of the utility model;

[0025] Figure 4 It is a clamping mechanism structure perspective explosion schematic view of the utility model.

[0026] In the drawing: 1 upper bottom plate, 2 lower bottom plate, 3 adjusting mechanism, 31 L-shaped tool plate, 32 axial adjusting groove, 33 positioning hole, 34 adjusting bolt, 4 clamping mechanism, 41 clamping base, 42 deflection through slot, 43 clamping T-shaped plate, 44 clamping arc groove one, 45 clamping arc groove two, 46 deflection column, 47 deflection through hole, 48 mounting bolt. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] Embodiment one:

[0029] Please refer to Figures 1-4 The utility model provides a technical scheme: a variable size umbilical cable steel pipe bending fatigue test device, including upper bottom plate 1,

[0030] And the lower bottom plate 2 of symmetrical setting below upper bottom plate 1,

[0031] Two symmetrical settings adjusting mechanism 3 are installed on upper bottom plate 1 and lower bottom plate 2,

[0032] Four adjusting mechanism 3 are arranged between upper bottom plate 1 and lower bottom plate 2, and the upper two adjusting mechanism 3 are arranged between the lower two adjusting mechanism 3,

[0033] Adjusting mechanism 3 is provided with clamping mechanism 4,

[0034] Adjusting mechanism 3 includes L-shaped tooling plate 31, and two axial adjusting grooves 32 are symmetrically formed on upper bottom plate 1 and lower bottom plate 2, two groups of positioning holes 33 are formed on the surface of L-shaped tooling plate 31 corresponding to the position of the two axial adjusting grooves 32 on one side, adjusting bolts 34 are arranged on the outer side of upper bottom plate 1 and lower bottom plate 2, one end of adjusting bolt 34 extends to the inside of corresponding positioning hole 33 through corresponding axial adjusting groove 32, and is threadedly connected with the inner wall of positioning hole 33, the inner side surface of upper adjusting bolt 34 is clamped with the surface of upper bottom plate 1, and the inner side surface of lower adjusting bolt 34 is clamped with the surface of lower bottom plate 2.

[0035] Further, the axial position of L-shaped tooling plate 31 is changed, the four-point clamping spacing is adjusted, and the four-point bending fatigue test requirement of different spacing requirement can be met,

[0036] Embodiment two

[0037] Please refer to Figures 1-4 And on the basis of embodiment one, further get: clamping mechanism 4 includes clamping base 41, and the vertical end side surface of L-shaped tooling plate 31 is throughly provided with deflection through groove 42, and clamping base 41 is horizontally arranged in the inner side of deflection through groove 42,

[0038] The clamping base 41 is provided with a clamping arc groove one 44 through the left and right, the protruding end of the clamping T-shaped plate 43 extends to the inside of the clamping arc groove one 44, the surface of the clamping T-shaped plate 43 is in extrusion contact with the surface of the clamping base 41, the protruding end of the clamping T-shaped plate 43 is provided with a clamping arc groove two 45 through the left and right, the inner wall of the clamping arc groove two 45 and the inner wall of the clamping arc groove one 44 form a clamping circular hole, the clamping base 41 is provided with a deflection column 46 on the front and rear sides in an interference fit, the deflection through groove 42 is provided with a deflection through hole 47 through the inner wall of the front and rear ends corresponding to the positions of the two deflection columns 46, and the outer end of the deflection column 46 extends to the inside of the corresponding deflection through hole 47 and is rotationally connected with the inner wall of the deflection through hole 47.

[0039] The clamping T-shaped plate 43 is vertically provided with a mounting bolt 48 on the outer side, one end of the mounting bolt 48 is sequentially provided through the clamping T-shaped plate 43 and the clamping base 41, the inner side surface of the mounting bolt 48 is provided in a clamping manner with the surface of the clamping T-shaped plate 43, and the surface of the mounting bolt 48 is in threaded connection with the inner wall of the clamping base 41.

[0040] Further, the embodiment is aimed at different sizes of steel pipes inside the umbilical cable, and after the test of each sample is completed, the size of the clamping circular hole can be changed by disassembling the deflection column 46 and replacing the clamping base 41 and the clamping T-shaped plate 43 of different sizes, so as to adapt to steel pipe samples of different sizes.

[0041] In use, the steel pipe test piece to be measured is passed through the four clamping circular holes, and the mounting bolt 48 is tightened to fix the workpiece, and the axial reciprocating displacement amount of the upper base plate 1 is controlled by operating the loading device mounted on the outer side of the upper base plate 1 and the lower base plate 2, so as to realize the reciprocating four-point bending loading of the steel pipe test piece.

[0042] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A variable-size umbilical cable steel pipe bending fatigue testing device, comprising an upper base plate (1); And a lower base plate (2) symmetrically arranged below the upper base plate (1); Its features are: Two symmetrically arranged adjustment mechanisms (3) are installed on both the upper base plate (1) and the lower base plate (2); All four adjustment mechanisms (3) are located between the upper base plate (1) and the lower base plate (2), and the two upper adjustment mechanisms (3) are located between the two lower adjustment mechanisms (3); The adjustment mechanism (3) is provided with a clamping mechanism (4).

2. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 1, characterized in that: The adjustment mechanism (3) includes an L-shaped tooling plate (31). Two axial adjustment grooves (32) are symmetrically opened on the upper base plate (1) and the lower base plate (2). Two sets of positioning holes (33) are opened on the two axial adjustment grooves (32) on the corresponding side of the surface of the L-shaped tooling plate (31). Adjustment bolts (34) are provided on the outer side of the upper base plate (1) and the lower base plate (2).

3. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 2, characterized in that: One end of the adjusting bolt (34) extends through the corresponding axial adjusting groove (32) to the inside of the corresponding positioning hole (33) and is threaded to the inner wall of the positioning hole (33). The inner side of the upper adjusting bolt (34) is engaged with the surface of the upper base plate (1), and the inner side of the lower adjusting bolt (34) is engaged with the surface of the lower base plate (2).

4. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 3, characterized in that: The clamping mechanism (4) includes a clamping base (41), and the L-shaped tooling plate (31) has a deflection groove (42) through the vertical side, and the clamping base (41) is horizontally arranged inside the deflection groove (42).

5. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 4, characterized in that: The deflection channel (42) is provided with a clamping T-plate (43), which is horizontally arranged on one side of the clamping base (41).

6. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 5, characterized in that: The clamping base (41) has a clamping arc groove 1 (44) extending through the left and right sides. The protruding end of the clamping T-shaped plate (43) extends into the clamping arc groove 1 (44). The surface of the clamping T-shaped plate (43) is in contact with the surface of the clamping base (41). The protruding end of the clamping T-shaped plate (43) has a clamping arc groove 2 (45) extending through the left and right sides. The inner wall of the clamping arc groove 2 (45) and the inner wall of the clamping arc groove 1 (44) form a clamping circular hole.

7. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 6, characterized in that: The clamping base (41) is fitted with deflection posts (46) on both the front and rear sides. The inner walls of the front and rear ends of the deflection slot (42) are provided with deflection holes (47) corresponding to the positions of the two deflection posts (46). The outer ends of the deflection posts (46) extend into the corresponding deflection holes (47) and are rotatably connected to the inner walls of the deflection holes (47).

8. The variable-size umbilical cable steel pipe bending fatigue testing device according to claim 7, characterized in that: The clamping T-plate (43) is vertically provided with mounting bolts (48) on its outer side. One end of the mounting bolts (48) passes through the clamping T-plate (43) and the clamping base (41) in sequence. The inner side of the mounting bolts (48) is engaged with the surface of the clamping T-plate (43). The surface of the mounting bolts (48) is threaded to the inner wall of the clamping base (41).

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