A pipeline fixing device for a fatigue testing machine and a method of using the same

Abstract

The present invention discloses a pipeline fixing device for a fatigue testing machine and a method for using the same, and belongs to the technical field of pipeline bending fatigue testing devices. The pipeline fixing device of the present invention is arranged on one side of the fatigue testing machine, and is used to fix the non-test end of the pipeline, and includes a three-axis moving mechanism, a pipeline clamping mechanism, and a pipeline centering mechanism. The pipeline clamping mechanism is fixedly arranged above the three-axis moving mechanism, and the pipeline centering mechanism is detachably arranged above the pipeline clamping mechanism. The three-axis moving mechanism is used to adjust the pipeline clamping mechanism and the pipeline test end of the fatigue testing machine according to the positioning of the pipeline centering mechanism. The device can not only realize position adjustment in the three directions of XYZ and has a centering function, so as to realize the fixing and centering of pipelines of different lengths and diameters, and has universal applicability; and because it can realize the precise centering of the pipeline fixed end and the pipeline test end, it further ensures the accuracy of the test.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue testing machines, and in particular to a pipeline fixing device for a fatigue testing machine and a use method thereof. Background Art

[0002] In oilfield pipelines, fatigue fracture of pipelines is often caused by various alternating stresses in the pipelines. Such alternating stresses are mainly caused by pressure fluctuations of the pipeline transport medium, geological changes outside the pipeline, and changes in ambient temperature. Under these loads, the pipeline will not only produce fatigue along the axial direction of the pipeline, but also bending fatigue. Therefore, it is very necessary to test the fatigue mechanical properties of pipelines in oilfield pipelines.

[0003] At present, for the test device that uses a universal fatigue testing machine to test pipeline fatigue, the free end of the pipeline needs to be fixed by a fixed bracket. However, since pipeline fatigue testing usually uses original parts for testing, the diameter and length of the original parts are not uniform. When the pipeline length and pipeline diameter change, it is necessary to redesign the fixed end bracket of the corresponding size, which not only slows down the test progress, but also increases the test cost. Therefore, it is urgent to design a new fatigue testing machine pipeline fixing device that can adapt to different pipeline lengths and pipeline diameters. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a pipeline fixing device for a fatigue testing machine and a method for using the same. The device can not only realize position adjustment in three directions of XYZ but also has a centering function, thereby realizing the fixing and centering of pipelines of different lengths and diameters, and has universal applicability; and because it can realize precise centering of the pipeline fixing end and the pipeline test end, it further ensures the accuracy of the test.

[0005] The technical solution adopted by the present invention is:

[0006] A pipeline fixing device for a fatigue testing machine is arranged on one side of the fatigue testing machine and is used to fix the non-test end of the pipeline. The device comprises a three-axis moving mechanism, a pipeline clamping mechanism and a pipeline centering mechanism. The pipeline clamping mechanism is fixedly arranged above the three-axis moving mechanism. The pipeline centering mechanism is detachably arranged above the pipeline clamping mechanism. The three-axis moving mechanism is used to adjust the alignment between the pipeline clamping mechanism and the pipeline test end of the fatigue testing machine according to the positioning of the pipeline centering mechanism.

[0007] The three-axis moving mechanism comprises a base fixed to the ground, an X-direction moving bracket moving along the X direction of the base is arranged above the base; two vertical Z-direction hollow columns are symmetrically arranged above the X-direction moving bracket and on both sides of the X-direction moving bracket, a guide shaft is arranged in the middle of each Z-direction hollow column, a coarse adjustment bar and a fine adjustment bar that can slide along the guide shaft are arranged between the two guide shafts, the fine adjustment bar is located above the coarse adjustment bar, a fine adjustment component for adjusting the distance between the fine adjustment bar and the coarse adjustment bar is arranged between the coarse adjustment bar and the fine adjustment bar, the coarse adjustment bar is fixedly connected to the Z-direction hollow column by a pin, and the fine adjustment bar is adjusted in position by the fine adjustment component; a Y-direction slide rail is arranged above the fine adjustment bar, and the pipe clamping mechanism is slidably arranged above the Y-direction slide rail; the fine adjustment component comprises an upper fine adjustment fixed seat and a lower fine adjustment fixed seat respectively fixedly connected to the fine adjustment bar and the coarse adjustment bar, and a scissor assembly and a control are arranged between the upper fine adjustment fixed seat and the lower fine adjustment fixed seat. The scissors fork assembly opens and closes to realize a screw adjustment assembly for fine-tuning the lifting and lowering of the horizontal bar; the screw adjustment assembly includes an adjustment screw with positive and negative rotation threads at both ends and two square adjustment sleeves with internal threads that match the positive and negative rotation threads of the adjustment screws respectively, and the adjustment screw is sleeved on the two square adjustment sleeves; the scissors fork assembly is provided with at least one group, and the scissors fork assembly includes a first scissors fork upper arm, a first scissors fork lower arm, a second scissors fork upper arm, and a second scissors fork lower arm, and the first scissors fork upper arm, the first scissors fork lower arm, the second scissors fork upper arm, and the second scissors fork lower arm are combined to form a diamond structure; one end of the first scissors fork upper arm and the first scissors fork lower arm is respectively hinged to one of the adjustment sleeves, and the other ends of the first scissors fork upper arm and the first scissors fork lower arm are respectively hinged to an upper fine-tuning fixed seat and a lower fine-tuning fixed seat; one end of the second scissors fork upper arm and the second scissors fork lower arm is respectively hinged to another adjustment sleeve, and the other ends of the second scissors fork upper arm and the second scissors fork lower arm are respectively hinged to an upper fine-tuning fixed seat and a lower fine-tuning fixed seat;

[0008] The pipe clamping mechanism comprises a pipe clamping seat with a U-shaped cross section which is slidably connected to the Y-axis slide rail, and at least one pipe clamp is arranged on the pipe clamping seat, and the pipe clamp is fixedly connected to the pipe clamping seat;

[0009] The pipeline centering mechanism comprises a laser emitting component and a laser receiving component. The laser emitting component is arranged above the pipeline test end, and the laser receiving component is arranged above the pipeline clamping mechanism.

[0010] Furthermore, the base includes two parallel base crossbeams, and two sides of the bottom of the X-axis movable bracket are provided with sliding grooves matching with the base crossbeams;

[0011] The outer side surface of the base crossbeam is provided with a rack along its length direction, and the sliding groove at the bottom of the X-axis movable bracket is provided with a groove matching the rack on the side close to the rack, and a locking rack slider is provided in the groove, the outer side surface of the locking rack slider is connected to the outer side wall of the X-axis movable bracket by bolts, and the inner side surface of the locking rack slider is meshed with the rack; the X-axis movable bracket and the base are locked by the locking rack slider and the bolts.

[0012] Furthermore, a plurality of coarse adjustment holes are provided on the side of the Z-axis hollow column along its length direction, and corresponding coarse adjustment holes are provided on the side of the coarse adjustment cross bar. The position adjustment of the coarse adjustment cross bar is achieved by inserting pins into the coarse adjustment holes of the Z-axis hollow column and the coarse adjustment holes of the coarse adjustment cross bar.

[0013] Furthermore, locking sliders and bolts are provided on both sides of the pipe clamping seat, and the pipe clamping seat and the Y-axis slide rail are locked by the locking sliders and the bolts.

[0014] Furthermore, the pipe clamp includes an upper pipe clamp and a lower pipe clamp, the upper pipe clamp and the lower pipe clamp are fixedly connected by bolts, the top surface of the pipe clamping seat and the outer surface of the lower pipe clamp are provided with a centering line, and the centering line of the lower pipe clamp is aligned with the centering line of the pipe clamping seat.

[0015] Furthermore, the laser emitting assembly includes a transmitter bracket and a laser transmitter fixed in the middle of the upper part of the transmitter bracket, and the laser receiving assembly includes a receiver bracket and a laser receiver fixed in the middle of the upper part of the receiver bracket; the transmitter bracket and the receiver bracket are respectively fixed to the pipeline test end of the fatigue testing machine and above the lower half of the pipeline clamp of the pipeline fixing device by magnetic attraction, and the centers of the transmitter bracket and the receiver bracket are aligned with the centering line of the lower half of the pipeline clamp, and scale lines are provided on the outer sides of the transmitter bracket and the receiver bracket.

[0016] The present invention also provides a method for using the pipeline fixing device of a fatigue testing machine, comprising the steps of:

[0017] (1) Measure the length and diameter of the pipe to be tested;

[0018] (2) Select a pipe clamp of corresponding diameter according to the diameter of the pipe to be tested, and fix the lower half of the pipe clamp on the pipe clamp holder. During the installation and fixing process, fix the pipe clamp in the middle position of the pipe clamp holder by aligning the center line, and install the lower half of the pipe clamp at the test end of the pipe at the same time;

[0019] (3) Install the laser emitting assembly and the laser receiving assembly on the lower half pipe clamp at the test end of the pipeline and one of the lower half pipe clamps of the pipeline fixing device respectively, and adjust the installation position by the scale line so that the center of the laser emitting assembly and the laser receiving assembly are aligned with the center line of the lower half pipe clamp, that is, fix the laser transmitter and the laser receiver at the center position of the corresponding transmitter bracket and the receiver bracket, and align the center position of the transmitter bracket and the receiver bracket with the center line of the lower half pipe clamp, and then turn on the laser transmitter;

[0020] (4) Move the X-axis movable bracket according to the length of the pipeline. When the distance between the pipeline fixing device and the test end of the pipeline is equal to the length of the pipeline, fix the X-axis movable bracket to the base to complete the X-axis positioning;

[0021] (5) According to the position of the laser received by the laser receiver, adjust the coarse adjustment bar so that the lower half of the pipe clamp of the pipe fixing device is at a lower position than the lower half of the pipe clamp at the test end of the pipe, and fix it; then turn the adjustment screw to move the fine adjustment bar in the Z direction. When the laser emitted by the laser transmitter is observed to fall on the horizontal center line of the laser receiver, stop turning the adjustment screw to complete the Z direction positioning;

[0022] (6) Move the pipe clamping mechanism along the Y-direction slide rail. When the laser emitted by the laser transmitter is observed to fall on the center point of the laser receiver, stop moving and fix it to complete the Y-direction positioning, that is, complete the centering operation;

[0023] (7) Disassemble the pipeline centering mechanism, place the pipeline on the pipeline fixture and the lower half of the pipeline clamp at the test end of the pipeline, and fix the upper half of the pipeline clamp above the lower half of the pipeline clamp on one side of the pipeline fixture, that is, fix the non-test end of the pipeline;

[0024] (8) After the above steps are completed, the pipeline is fixed, the corresponding parameters are set according to the test conditions, and the pipeline fatigue test is carried out.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a pipeline fixing device for a fatigue testing machine and a method for using the same. The pipeline fixing device comprises a three-axis moving mechanism, a pipeline clamping mechanism and a pipeline centering mechanism. The three-axis moving mechanism is used for adjusting the centering of the pipeline clamping mechanism and a pipeline test end of the fatigue testing machine according to the positioning of the pipeline centering mechanism. That is, the device can not only realize position adjustment in three directions of XYZ but also has a centering function, thereby realizing the fixing and centering of pipelines of different lengths and different diameters, and has universal applicability. Moreover, since the accurate centering of the pipeline fixing end and the pipeline test end can be realized, the accuracy of the test is further guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 Schematic diagram of the fatigue test machine pipe fixture after installing the pipe;

[0029] Figure 2 This is a schematic diagram of the overall structure of the pipeline fixing device of the fatigue testing machine;

[0030] Figure 3 It is a structural schematic diagram of the three-axis moving mechanism;

[0031] Figure 4 It is a schematic diagram of the structure of the rack on the base and the locking rack slider;

[0032] Figure 5 It is a schematic diagram of the pipe clamping mechanism installed on the Y-axis slide rail;

[0033] Figure 6 It is a structural schematic diagram of the pipe clamping mechanism;

[0034] Figure 7 It is a structural schematic diagram of the fine adjustment component;

[0035] Figure 8 It is a structural schematic diagram of the pipeline centering mechanism.

[0036] Labels in the figure: 1. Three-axis moving mechanism; 11. Base; 111. Base beam; 112. Rack; 113. Locking rack slider; 12. X-axis moving bracket; 13. Z-axis hollow column; 131. Guide shaft; 132. Coarse adjustment hole; 14. Coarse adjustment bar; 15. Fine adjustment bar; 16. Fine adjustment assembly; 161. Upper fine adjustment fixing seat; 162. Lower fine adjustment fixing seat; 163. Adjustment screw; 164. Adjustment sleeve; 165. First scissor upper arm; 166 , first scissors fork lower arm; 167, second scissors fork upper arm; 168, second scissors fork lower arm; 17, Y-axis slide rail; 2, pipe clamping mechanism; 21, pipe clamping seat; 22, pipe clamp; 23, partition block; 24, fixing plate; 25, locking slider; 3, pipe centering mechanism; 31, laser emitting assembly; 311, emitter bracket; 312, laser emitter; 32, laser receiving assembly; 321, receiver bracket; 322, laser receiver; 4, fatigue testing machine. DETAILED DESCRIPTION

[0037] The present invention provides a fatigue testing machine pipeline fixing device and a method for using the same. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] The present invention is described in detail below with reference to the accompanying drawings.

[0039] Reference Figure 1 The present embodiment provides a fatigue testing machine pipeline fixing device and a fatigue testing machine having the fixing device, wherein the pipeline fixing device is arranged on the side of the fatigue testing machine 4, and is used to fix the non-test end of the pipeline. A pipeline test end is arranged on one side of the fatigue testing machine 4, and is used to place the test end of the pipeline and perform fatigue testing on the test end of the pipeline. The pipeline test end is provided with an upper clamp and a lower clamp, and the lower clamp is provided with a lower half pipeline clamp for placing the pipeline test end.

[0040] Reference Figure 2 The pipeline fixing device of the fatigue testing machine of this embodiment includes a three-axis moving mechanism 1, a pipeline clamping mechanism 2 and a pipeline centering mechanism 3, wherein the pipeline clamping mechanism 2 is fixedly arranged above the three-axis moving mechanism 1, and the pipeline centering mechanism 3 is detachably arranged above the pipeline clamping mechanism 2. The above-mentioned three-axis moving mechanism 1 is used to adjust the alignment of the pipeline clamping mechanism 2 and the pipeline test end of the fatigue testing machine according to the positioning of the pipeline centering mechanism 3.

[0041] The specific structures of the above components are as follows.

[0042] The three-axis moving mechanism 1 comprises a base 11 fixed to the ground, and an X-direction moving bracket 12 moving along the X-direction of the base is arranged above the base 11; specifically, the base 11 comprises two parallel base crossbeams 111, and the outer side surface of the base crossbeam is provided with a rack 112 along its length direction; both sides of the bottom of the X-direction moving bracket 12 are provided with a slide groove matching with the base crossbeam, and a groove matching with the rack is arranged on the side of the slide groove at the bottom of the X-direction moving bracket 12 close to the rack 112, and a locking rack slider 113 is arranged in the groove, and the locking rack slider 113 is arranged in the locking rack slider 113 ... The outer side surface of the locking rack slider 113 is connected to the outer side wall of the X-axis movable bracket 12 by bolts, and the inner side surface of the locking rack slider 113 is meshed with the rack 112. The X-axis movable bracket 12 and the base are locked by locking the rack slider 113 and the bolts, that is, the bolts are turned to move the locking rack slider in the direction of the rack until the inner side surface of the locking rack slider 113 is meshed with the rack 112 to achieve locking; in addition, when the X-axis movable bracket needs to be adjusted, the bolts are turned to move the locking rack slider in the direction away from the rack to ensure that the X-axis movable bracket can be pushed to adjust its position.

[0043] Two vertical Z-direction hollow columns 13 are symmetrically arranged above the X-direction movable bracket 12 and on both sides of the X-direction movable bracket 12, and a guide shaft 131 is arranged in the middle of each Z-direction hollow column 13, and a coarse adjustment bar 14 and a fine adjustment bar 15 that can slide along the guide shaft are arranged between the two guide shafts 131, and the fine adjustment bar 15 is located above the coarse adjustment bar 14; guide holes are arranged at both ends of the coarse adjustment bar 14 and the fine adjustment bar 15, and the coarse adjustment bar 14 and the fine adjustment bar 15 are provided with guide holes. When installing, the guide holes of 14 and the fine-adjustment cross bar 15 are sleeved on the guide shaft to realize the sliding of the coarse-adjustment cross bar 14 and the fine-adjustment cross bar 15 along the guide shaft; in addition, the side surfaces of both sides of the Z-axis hollow column 13 are provided with a plurality of coarse-adjustment holes 132 along its length direction, and the side surfaces of both sides of the coarse-adjustment cross bar 14 are also provided with corresponding coarse-adjustment holes, and the position adjustment of the coarse-adjustment cross bar 14 is realized by inserting pins into the coarse-adjustment holes of the Z-axis hollow column 13 and the coarse-adjustment holes of the coarse-adjustment cross bar 14.

[0044] A fine adjustment component 16 for adjusting the distance between the fine adjustment bar and the coarse adjustment bar is provided between the coarse adjustment bar 14 and the fine adjustment bar 15. The coarse adjustment bar 14 is fixedly connected to the Z-axis hollow column 13 by a pin, and the position of the fine adjustment bar 15 is adjusted by the fine adjustment component 16; specifically, the fine adjustment component 16 comprises an upper fine adjustment fixing seat 161 and a lower fine adjustment fixing seat 162 respectively fixedly connected to the fine adjustment bar 15 and the coarse adjustment bar 14, and two groups of scissor fork assemblies and a screw adjustment component for controlling the opening and closing of the scissor fork assemblies to realize the lifting and lowering of the fine adjustment bar are provided between the upper fine adjustment fixing seat 161 and the lower fine adjustment fixing seat 162; specifically, the screw adjustment component comprises an adjustment screw 163 with forward and reverse rotation threads at both ends and two square adjustment sleeves 164 with internal threads matched with the forward and reverse rotation threads of the respective adjustment screws, and the adjustment screw 163 is sleeved on the two square adjustment sleeves 164; The scissor assembly comprises a first scissor upper arm 165, a first scissor lower arm 166, a second scissor upper arm 167, and a second scissor lower arm 168. The first scissor upper arm 165, the first scissor lower arm 166, the second scissor upper arm 167, and the second scissor lower arm 168 are combined to form a diamond structure; one end of the first scissor upper arm 165 and the first scissor lower arm 166 are respectively hinged to one of the adjustment sleeves 164 through a hinge pin, and the first scissor upper arm 165 and the first scissor lower arm 166 are respectively hinged to one of the adjustment sleeves 164 through a hinge pin, and the first scissor The other ends of the upper arm 165 and the first scissor lower arm 166 are respectively hinged to the upper fine-adjustment fixed seat 161 and the lower fine-adjustment fixed seat 162 through the hinge pin; one end of the second scissor upper arm 167 and the second scissor lower arm 168 are respectively hinged to another adjustment sleeve 164 through the hinge pin, and the other ends of the second scissor upper arm 167 and the second scissor lower arm 168 are respectively hinged to the upper fine-adjustment fixed seat 161 and the lower fine-adjustment fixed seat 162 through the hinge pin. By rotating the adjustment screw, the two adjustment sleeves can be brought closer or separated along the axis of the adjustment screw, thereby driving the first scissor upper and lower arms and the second scissor upper and lower arms hinged to the adjustment sleeve to be closer or separated along the axis of the adjustment screw, and then pulling the first scissor upper and lower arms and the second scissor upper and lower arms to rotate around the corresponding hinge pins, thereby realizing the lifting and lowering of the upper fine-adjustment fixed seat and driving the lifting and lowering of the fine-adjustment crossbar.

[0045] Two Y-direction slide rails 17 are arranged above the fine adjustment horizontal bar 15 , and the pipe clamping mechanism 2 is slidably arranged above the Y-direction slide rails 17 .

[0046] The pipe clamping mechanism 2 comprises a pipe clamping seat 21 with a U-shaped cross section that is slidably connected to the Y-direction slide rail 17, and a slide groove that matches the Y-direction slide rail is provided at the bottom of the pipe clamping seat; two pipe clamps 22 are provided on the pipe clamping seat 21, and a partition block 23 is provided between the two pipe clamps, and a fixing plate 24 is provided between the two pipe clamps 22 and the pipe clamping seat 21. In addition, bolt holes are provided on the side walls of the pipe clamping seat 21, and the fixing plate 24 is pushed by screwing the bolts to clamp the pipe clamps 22, so that the pipe clamps 22 are fixed to the pipe clamping seat 21. In addition, locking sliders 25 and bolts are provided on both sides of the pipe clamping seat 21, and the lower part of the locking slider is provided in the T-slot in the middle of the fine adjustment bar, and the upper part of the locking slider is located above the T-slot and is L-shaped, and the pipe clamping seat 21 and the Y-direction slide rail 17 are locked by the locking slider 25 and the bolts.

[0047] The pipe clamp 22 comprises an upper pipe clamp and a lower pipe clamp, and the upper pipe clamp and the lower pipe clamp are fixedly connected by bolts; a centering line is provided on the top surface of the pipe clamp seat 21 and the outer surface of the lower pipe clamp, and the centering line of the lower pipe clamp is aligned with the centering line of the pipe clamp seat.

[0048] The pipeline centering mechanism 3 includes a laser emitting component 31 and a laser receiving component 32. The laser emitting component 31 is arranged above the pipeline test end, and the laser receiving component 32 is arranged above the pipeline clamping mechanism. Specifically, the laser emitting component 31 includes a transmitter bracket 311 and a laser transmitter 312 fixed to the middle part above the transmitter bracket, and the laser receiving component 32 includes a receiver bracket 321 and a laser receiver 322 fixed to the middle part above the receiver bracket; the transmitter bracket 311 and the receiver bracket 321 are respectively fixed to the pipeline test end of the fatigue testing machine and the upper part of the lower half of the pipeline clamp of the pipeline fixing device by magnetic attraction. Specifically, a groove can be arranged at the bottom of the transmitter bracket 311 and the receiver bracket 321, and a magnetic strip is fixed in the groove; in addition, the outer side surface of the transmitter bracket 311 and the receiver bracket 321 is provided with a scale line. When installing the transmitter bracket 311 and the receiver bracket 321, the installation position is adjusted by the scale line so that the center of the transmitter bracket and the receiver bracket is aligned with the centering line of the lower half of the pipeline clamp.

[0049] The above-mentioned laser transmitter is specifically a cross laser transmitter, and the laser receiver is specifically a cross laser receiving plate, and the cross laser receiving plate is provided with a horizontal center line and a vertical center line, and the intersection of the horizontal center line and the vertical center line forms a cross center point.

[0050] The fatigue test machine is used to perform fatigue test on the pipeline, and the specific method of use is as follows:

[0051] (1) Measure the length and diameter of the pipe to be tested;

[0052] (2) Select a pipe clamp of corresponding diameter according to the diameter of the pipe to be tested, and fix the lower half of the pipe clamp on the pipe clamp holder. During the installation and fixing process, fix the pipe clamp in the middle position of the pipe clamp holder by aligning the center line, and install the lower half of the pipe clamp at the test end of the pipe at the same time;

[0053] (3) Install the laser emitting assembly and the laser receiving assembly on the lower half pipe clamp at the test end of the pipeline and one of the lower half pipe clamps of the pipeline fixing device respectively, and adjust the installation position by the scale line so that the center of the laser emitting assembly and the laser receiving assembly are aligned with the center line of the lower half pipe clamp, that is, fix the laser transmitter and the laser receiver at the center position of the corresponding transmitter bracket and the receiver bracket, and align the center position of the transmitter bracket and the receiver bracket with the center line of the lower half pipe clamp, and then turn on the laser transmitter;

[0054] (4) Move the X-axis movable bracket according to the length of the pipeline. When the distance between the pipeline fixing device and the test end of the pipeline is equal to the length of the pipeline, fix the X-axis movable bracket to the base to complete the X-axis positioning;

[0055] (5) According to the position of the laser received by the laser receiver, adjust the coarse adjustment bar so that the lower half of the pipe clamp of the pipe fixing device is at a lower position than the lower half of the pipe clamp at the test end of the pipe, and fix it; then turn the adjustment screw to move the fine adjustment bar in the Z direction. When the laser emitted by the laser transmitter is observed to fall on the horizontal center line of the laser receiver, stop turning the adjustment screw to complete the Z direction positioning;

[0056] (6) Move the pipe clamping mechanism along the Y-direction slide rail. When the laser emitted by the laser transmitter is observed to fall on the center point of the laser receiver, stop moving and fix it to complete the Y-direction positioning, that is, complete the centering operation;

[0057] (7) Remove the pipe centering mechanism and place the pipe on the pipe fixture and the lower pipe clamp at the test end of the pipe, and fix the upper pipe clamp above the lower pipe clamp on one side of the pipe fixture to fix the non-test end of the pipe;

[0058] (8) After the above steps are completed, the pipeline is fixed, the corresponding parameters are set according to the test conditions, and the pipeline fatigue test is carried out.

[0059] It should be noted that some parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0060] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A pipeline fixing device for a fatigue testing machine, arranged on one side of the fatigue testing machine, for fixing the non-test end of the pipeline, characterized in that: It includes a three-axis moving mechanism, a pipe clamping mechanism and a pipe centering mechanism, wherein the pipe clamping mechanism is fixedly arranged above the three-axis moving mechanism, and the pipe centering mechanism is detachably arranged above the pipe clamping mechanism, and the three-axis moving mechanism is used to adjust the pipe clamping mechanism and the pipe test end of the fatigue testing machine according to the positioning of the pipe centering mechanism; The three-axis moving mechanism comprises a base fixed to the ground, an X-direction moving bracket moving along the X direction of the base is arranged above the base; two vertical Z-direction hollow columns are symmetrically arranged above the X-direction moving bracket and on both sides of the X-direction moving bracket, a guide shaft is arranged in the middle of each Z-direction hollow column, a coarse adjustment bar and a fine adjustment bar that can slide along the guide shaft are arranged between the two guide shafts, the fine adjustment bar is located above the coarse adjustment bar, a fine adjustment component for adjusting the distance between the fine adjustment bar and the coarse adjustment bar is arranged between the coarse adjustment bar and the fine adjustment bar, the coarse adjustment bar is fixedly connected to the Z-direction hollow column by a pin, and the fine adjustment bar is adjusted in position by the fine adjustment component; a Y-direction slide rail is arranged above the fine adjustment bar, and the pipe clamping mechanism is slidably arranged above the Y-direction slide rail; the fine adjustment component comprises an upper fine adjustment fixed seat and a lower fine adjustment fixed seat respectively fixedly connected to the fine adjustment bar and the coarse adjustment bar, and a scissor assembly and a control are arranged between the upper fine adjustment fixed seat and the lower fine adjustment fixed seat. The scissors fork assembly opens and closes to realize a screw adjustment assembly for fine-tuning the lifting and lowering of the horizontal bar; the screw adjustment assembly includes an adjustment screw with positive and negative rotation threads at both ends and two square adjustment sleeves with internal threads that match the positive and negative rotation threads of the adjustment screws respectively, and the adjustment screw is sleeved on the two square adjustment sleeves; the scissors fork assembly is provided with at least one group, and the scissors fork assembly includes a first scissors fork upper arm, a first scissors fork lower arm, a second scissors fork upper arm, and a second scissors fork lower arm, and the first scissors fork upper arm, the first scissors fork lower arm, the second scissors fork upper arm, and the second scissors fork lower arm are combined to form a diamond structure; one end of the first scissors fork upper arm and the first scissors fork lower arm is respectively hinged to one of the adjustment sleeves, and the other ends of the first scissors fork upper arm and the first scissors fork lower arm are respectively hinged to an upper fine-tuning fixed seat and a lower fine-tuning fixed seat; one end of the second scissors fork upper arm and the second scissors fork lower arm is respectively hinged to another adjustment sleeve, and the other ends of the second scissors fork upper arm and the second scissors fork lower arm are respectively hinged to an upper fine-tuning fixed seat and a lower fine-tuning fixed seat; The pipe clamping mechanism comprises a pipe clamping seat with a U-shaped cross section which is slidably connected to the Y-axis slide rail, and at least one pipe clamp is arranged on the pipe clamping seat, and the pipe clamp is fixedly connected to the pipe clamping seat; The pipeline centering mechanism comprises a laser emitting component and a laser receiving component. The laser emitting component is arranged above the pipeline test end, and the laser receiving component is arranged above the pipeline clamping mechanism.

2. A fatigue testing machine pipeline fixing device according to claim 1, characterized in that: The base includes two parallel base beams, and two sides of the bottom of the X-axis movable bracket are provided with sliding grooves matching with the base beams; The outer side surface of the base crossbeam is provided with a rack along its length direction, and the sliding groove at the bottom of the X-axis movable bracket is provided with a groove matching the rack on the side close to the rack, and a locking rack slider is provided in the groove, the outer side surface of the locking rack slider is connected to the outer side wall of the X-axis movable bracket by bolts, and the inner side surface of the locking rack slider is meshed with the rack; the X-axis movable bracket and the base are locked by the locking rack slider and the bolts.

3. A fatigue testing machine pipeline fixing device according to claim 1, characterized in that: The side surface of the Z-axis hollow column is provided with a plurality of coarse adjustment holes along its length direction, and the side surface of the coarse adjustment cross bar is provided with corresponding coarse adjustment holes, and the position adjustment of the coarse adjustment cross bar is achieved by inserting pins into the coarse adjustment holes of the Z-axis hollow column and the coarse adjustment holes of the coarse adjustment cross bar.

4. A fatigue testing machine pipeline fixing device according to claim 1, characterized in that: The two sides of the pipe clamping seat are provided with locking slide blocks and bolts, and the pipe clamping seat and the Y-direction slide rail are locked by the locking slide blocks and the bolts.

5. The pipeline fixing device for a fatigue testing machine according to claim 1, characterized in that: The pipe clamp comprises an upper pipe clamp and a lower pipe clamp, wherein the upper pipe clamp and the lower pipe clamp are fixedly connected by bolts, and a centering line is provided on the top surface of the pipe clamping seat and the outer surface of the lower pipe clamp, and the centering line of the lower pipe clamp is aligned with the centering line of the pipe clamping seat.

6. A fatigue testing machine pipeline fixing device according to claim 5, characterized in that: The laser emitting assembly includes a transmitter bracket and a laser transmitter fixed in the middle of the upper part of the transmitter bracket, and the laser receiving assembly includes a receiver bracket and a laser receiver fixed in the middle of the upper part of the receiver bracket; the transmitter bracket and the receiver bracket are respectively fixed to the pipeline test end of the fatigue testing machine and above the lower half of the pipeline clamp of the pipeline fixing device by magnetic attraction, and the centers of the transmitter bracket and the receiver bracket are aligned with the centering line of the lower half of the pipeline clamp, and scale lines are provided on the outer sides of the transmitter bracket and the receiver bracket.

7. A method for using a pipeline fixing device for a fatigue testing machine, using the pipeline fixing device according to claim 6, characterized in that: Includes steps: (1) Measure the length and diameter of the pipe to be tested; (2) Select a pipe clamp of corresponding diameter according to the diameter of the pipe to be tested, and fix the lower half of the pipe clamp on the pipe clamp holder. During the installation and fixing process, fix the pipe clamp in the middle position of the pipe clamp holder by aligning the center line, and install the lower half of the pipe clamp at the test end of the pipe at the same time; (3) Install the laser emitting assembly and the laser receiving assembly on the lower half pipe clamp at the test end of the pipeline and one of the lower half pipe clamps of the pipeline fixing device respectively, and adjust the installation position by the scale line so that the center of the laser emitting assembly and the laser receiving assembly are aligned with the center line of the lower half pipe clamp, that is, fix the laser transmitter and the laser receiver at the center position of the corresponding transmitter bracket and the receiver bracket, and align the center position of the transmitter bracket and the receiver bracket with the center line of the lower half pipe clamp, and then turn on the laser transmitter; (4) Move the X-axis movable bracket according to the length of the pipeline. When the distance between the pipeline fixing device and the test end of the pipeline is equal to the length of the pipeline, fix the X-axis movable bracket to the base to complete the X-axis positioning; (5) According to the position of the laser received by the laser receiver, adjust the coarse adjustment bar so that the lower half of the pipe clamp of the pipe fixing device is at a lower position than the lower half of the pipe clamp at the test end of the pipe, and fix it; then turn the adjustment screw to move the fine adjustment bar in the Z direction. When the laser emitted by the laser transmitter is observed to fall on the horizontal center line of the laser receiver, stop turning the adjustment screw to complete the Z direction positioning; (6) Move the pipe clamping mechanism along the Y-direction slide rail. When the laser emitted by the laser transmitter is observed to fall on the center point of the laser receiver, stop moving and fix it to complete the Y-direction positioning, that is, complete the centering operation; (7) Disassemble the pipeline centering mechanism, place the pipeline on the pipeline fixture and the lower half of the pipeline clamp at the test end of the pipeline, and fix the upper half of the pipeline clamp above the lower half of the pipeline clamp on one side of the pipeline fixture, that is, fix the non-test end of the pipeline; (8) After the above steps are completed, the pipeline is fixed, the corresponding parameters are set according to the test conditions, and the pipeline fatigue test is carried out.

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