CN107515160A - Extra large oil pipe dynamic test set electrical system and method for testing based on PLC controls - Google Patents
Extra large oil pipe dynamic test set electrical system and method for testing based on PLC controls Download PDFInfo
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- CN107515160A CN107515160A CN201610429922.3A CN201610429922A CN107515160A CN 107515160 A CN107515160 A CN 107515160A CN 201610429922 A CN201610429922 A CN 201610429922A CN 107515160 A CN107515160 A CN 107515160A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The present invention relates to extra large the oil pipe dynamic test set electrical system and method for testing controlled based on PLC, system includes PLC control system and connected dynamic test equipment and touch-screen；The PLC control system is communicated with touch-screen by PROFIBUS.Method of testing includes bend test, torsion test and tension test.The present invention realizes automatic test substantially, and three bending, torsion, stretching test functions are combined, place is both saved, saves substantial amounts of manpower and time again, improve accuracy rate, ensured the safety of labourer, substantially increased production efficiency.
Description
Technical field
The invention belongs to automatically control application field, it is electric to be related to a kind of extra large oil pipe dynamic test set based on PLC controls
System and its method of testing, and in particular to touched by the series of PLC control systems of S7 300 and TP1200 Comfort of Siemens
Screen, dynamic test equipment have merged automatic control system, the technologies such as PROFIBUS buses and PID closed loop control algorithms are combined,
Tested with the fatigability dynamic of Yu Haiyang petroleum pipeline.
Background technology
The ocean in China has the petroleum resources deposit of very abundant, with growing consumption demand so that marine
Oil field and onshore petroleum industry system high-speed secure connection turn into the most important thing.Floating pipe line can be conveyed continuously largely
Crude oil, it is the means of transportation of most quick, safety and economic and reliable.
Floating pipe line is the important component of marine oil field development ＆ construction engineering, to the developing of offshore oilfield, raw
Externally conveying plays critical effect for production processing and product.The severe degree of the working environment of floating pipe line is managed with land
Road may be both acted on by wave, tide, corrosion etc. compared to more complicated and changeable, may face ship anchor again or ship drops thing
The danger pulled Deng shock, and pipeline is not only acted on by hydrostatic pressure in itself, while can be by axial tension and bending
The effect of load.Due to being chronically under these mal-conditions, there is the danger that hair check occurs the inside of pipeline material, and is such as not added with
To tackle and control, then the intensity of pipeline can be influenceed so that reducing its life-span, the detection of extra large oil pipe performance is successfully to develop sea
The important prerequisite of oil pipe finished product, the performance test of extra large oil pipe, workload is big, the cycle is long, it is artificial to depend merely on, efficient under, easily go out
Existing accident.At present, also without a kind of system and method for being tested automatically extra large oil pipe.
The content of the invention
Object of the present invention is to provide a kind of extra large oil pipe dynamic test set electrical system based on PLC controls and its survey
Method for testing.The newest rich way programming software platform of Siemens is relied on to carry out extra large oil pipe dynamic test set electrical system control method
Programming, the setting of dynamic test set electrical system important parameter is completed by touch-screen, makes to touch by PROFIBUS networks
Touch and interact data between screen and the CPU of PLC control system, PLC control system is tested with dynamic by controlling cable to realize
The interaction of system signal between equipment.Centered on PLC control system, finally realized with reference to PID closed loop control algorithms a set of
Three dynamic testing experiments on extra large oil pipe are effectively completed under PLC control system control.
The purpose of the present invention is achieved through the following technical solutions：Extra large oil pipe dynamic test set based on PLC controls
Electrical system, including PLC control system and connected dynamic test equipment and touch-screen；The PLC control system with
Touch-screen is communicated by PROFIBUS；
Touch-screen, for input parameter and display test data；
Dynamic test equipment, for realizing the bending, stretching and torsion of extra large oil pipe；
PLC control system, for sending control command control dynamic test equipment action according to input parameter, and according to biography
The data output of sensor collection is to touch-screen.
The dynamic test equipment includes bending dolly, vehicle guide and the bending apparatus being separately mounted on ground, drawn
Device, torsion device are stretched, wherein stretching device and torsion device is located at the both sides of the bending apparatus, the stretching device respectively
And the vehicle guide of installation on the ground is provided between torsion device, it is small that the vehicle guide is provided with bending sliding back and forth
Car；The bending apparatus includes left rail, left curved cylinder, active dolly, follow-up trolley, right curved cylinder and right guide rail, should
Left rail and right guide rail are separately mounted on the ground of the vehicle guide both sides, the left curved cylinder and right curved cylinder
It is separately positioned on left rail and right guide rail, the active dolly that is moved back and forth along left rail is connected on piston rod and along the right side
The follow-up trolley that guide rail moves back and forth；The torsion device includes reversing seat, left handed twist oil cylinder, torq and right torsion oil cylinder,
The torsion seat is installed on the ground, and the torq, which is rotatably installed in, to be reversed on seat, and installation is respectively equipped with the both sides of torq
On the torsion seat, the left handed twist oil cylinder that makes torq twist and right torsion oil cylinder；The stretching device includes installation
Stretching seat on the ground and the stretching oil cylinder on the stretching seat, for pulling follow-up trolley.
The left rail and right guide rail are symmetricly set in the both sides of vehicle guide, and the left rail and right guide rail are upper and lower two
Layer, the left curved cylinder and right curved cylinder are arranged on left rail and the right guide rail of any layer.
The piston cylinder seat of the left curved cylinder and right curved cylinder is separately fixed on left rail and right guide rail, piston rod
It is connected with the active dolly and follow-up trolley, one end of the active dolly and follow-up trolley is and rubber tubing end flange
The ring flange of face connection, the other end are slidably connected with the left rail and right guide rail respectively.
One end of the vehicle guide extends the underface between active dolly and follow-up trolley.
Alignment pin for being connected with the stretching oil cylinder is installed on the follow-up trolley.
The left handed twist oil cylinder is symmetricly set on the both sides of torq, the left handed twist oil cylinder and right torsion with right torsion oil cylinder
The piston rod end of oil cylinder is connected to the both sides for reversing seat, and both sides of the piston cylinder seat respectively with the torq are connected.
The PLC control system includes PLC and connected inclination angle detection sensor, pressure sensor, pulling force pass
Sensor, two linear displacement transducers, laser displacement sensors；The inclination angle detection sensor is located at the torq of torsion device
On the disk in outside, to the windup-degree of oil pipe during for measuring torsion test；The pressure sensor is located at each oil cylinder and company
At adapter pipeline joint, for each in-oil cylinder real-time pressure；The pulling force sensor is located at the torq inner circular of torsion device
At disk axis center, for measuring in tension test to the pulling force of oil pipe；Described two linear displacement transducers are respectively arranged on curved
On the relative side of the left rail of bent device, right guide rail, for measuring the displacement of active dolly, follow-up trolley；The laser position
Displacement sensor earthward projects the straight line of formation and the point of intersection of vehicle guide center line located at left rail, right guide rail, for surveying
The moving displacement of amount bending dolly.
Based on the extra large oil pipe dynamic test set electric test method of PLC controls, comprise the following steps：
Touch-screen receives the kind of test of user's input, including bend test, torsion test, tension test；
If bend test, PLC is driven respectively by the left curved cylinder for controlling dynamic test equipment, right curved cylinder
Active dolly, follow-up trolley, which move towards, makes extra large tubing bending；The active that PLC detects according to two linear displacement transducers is small
Relative displacement between car, follow-up trolley, the real-time relative velocity of active dolly, follow-up trolley is obtained, realizes left curved cylinder, the right side
The synchronous operation of curved cylinder；The bending dolly displacement of laser displacement sensor detection is the bending radius of extra large oil pipe；
If torsion test, PLC is by controlling the left handed twist oil cylinder of dynamic test equipment to reverse extra large oil pipe, when inclination angle is examined
When the angle value of survey sensor feedback reaches set angle, PLC sends turn-back instruction by controlling dynamic test equipment
Right torsion oil cylinder makes extra large oil pipe turn-back, realizes the torsion of the positive negative angle of extra large oil pipe；
If tension test：When static stretch is tested, PLC is by controlling the stretching oil cylinder of dynamic test equipment to make to be servo-actuated
Dolly drives extra large oil pipe stretching, and pulling force is detected by pulling force sensor；When dynamic tensile is tested, PLC is by controlling dynamic to test
The stretching oil cylinder of equipment makes follow-up trolley drive extra large oil pipe stretching, and PLC detects extra large oil pipe stretching power by pulling force sensor, works as sea
Oil pipe stretching power reaches preset value, then the instruction of release tensile force is provided by PLC, real untill tensile force reaches minimum value
The stretching repeatedly of existing extra large oil pipe.
Relative displacement between active dolly that the PLC detects according to two linear displacement transducers, follow-up trolley, is obtained
Real-time relative velocity to active dolly, follow-up trolley comprises the following steps：
PLC detects the displacement of active dolly, follow-up trolley according to two linear displacement transducers respectively；
Using the displacement detecting of active dolly as inner ring, by displacement setting value and the displacement detecting value of active dolly to a left side
Curved cylinder carries out PID control；
The real-time relative velocity of active dolly and follow-up trolley is worth to according to the displacement detecting of follow-up trolley, and then is obtained
Value of feedback of the speed of active dolly as outer shroud, active dolly is entered with value of feedback according to the velocity amplitude of the active dolly of setting
Row PID control, export displacement setting value of the displacement of active dolly as inner ring.
Advantages of the present invention is with good effect：
1. the SIEMENS PLC control system that the present invention uses, PROFIBUS networks, system stabilization and fast response time, make
Equipment is stablized safe and reliable.
2. the present invention ensured in the long-time follow-on test stage, according to the working condition of hydraulic power unit, timesharing switching is carried out
Work, it is ensured that the long-term use of stability and ease for maintenance of equipment
3. control aspect is bent, due to being double hydraulic cylinder master-slave synchronisation control mode, to ensure that equipment being capable of synchronism stability
Carry out test, measure loop employs two sets of laser range sensors, and in test process, control system can carry out double loop
The spacing control of closed loop.
4. the present invention can download preservation at any time by the transmission medium system such as network interface, SD card important parameter record, convenient
The regular maintenance of user.
5. the present invention realizes realtime monitoring control and the control of peripheral signal integration to three experiments, make up
The blank in the field.
6. the present invention realizes automatic test substantially, three bending, torsion, stretching test functions are combined, both
Place is saved, substantial amounts of manpower and time is saved again, improves accuracy rate, the safety of labourer has been ensured, has greatly improved
Production efficiency.
7. the every kind of test device of the present invention has been equipped with two corresponding hydraulic jacks, adds whole dynamic test and set
Standby flexibility and diversity, the phenomenon for avoiding rubber tubing from being short of power when doing dynamic and testing.
8. the present invention organically combines stretching device, bending apparatus, torsion device these parts, what is simplified moves
The structure of state test device, it is easy for installation, it is easy to safeguard, space is smaller.
9. the method for testing of the present invention is simple to operate, operating efficiency is high.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of dynamic test equipment of the present invention；
Fig. 2 is the structural front view of dynamic test equipment of the present invention；
Fig. 3 is the structure left view of dynamic test equipment of the present invention；
Fig. 4 is the structure top view of dynamic test equipment of the present invention；
Wherein：1 is reverses seat, and 2 be left handed twist oil cylinder, and 3 be torq, and 4 be left rail, and 5 be left curved cylinder, based on 6
Dynamic dolly, 7 be follow-up trolley, and 8 be alignment pin, and 9 be right curved cylinder, and 10 be right guide rail, and 11 be stretching oil cylinder, and 12 be stretching
Seat, 13 be bending dolly, and 14 be vehicle guide, and 15 be right torsion oil cylinder；
Fig. 5 is the electrical system hardware configuration structure chart of the present invention；
Fig. 6 is the electrical system test technology flow chart of the present invention；
Fig. 7 is the electrical system crooked test double closed-loop PID block diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
The dynamic test equipment of the present invention includes bending dolly, vehicle guide and the bending dress being separately mounted on ground
Put, stretching device, torsion device, wherein stretching device and torsion device are located at the both sides of the bending apparatus, the drawing respectively
Stretch and the vehicle guide of installation on the ground is provided between device and torsion device, the vehicle guide is provided with sliding back and forth curved
Bent dolly；The bending apparatus is led including left rail, left curved cylinder, active dolly, follow-up trolley, right curved cylinder and the right side
Rail, the left rail and right guide rail are separately mounted on the ground of the vehicle guide both sides, the left curved cylinder and right bending
Being separately positioned on left rail and right guide rail for oil cylinder, is connected to the active dolly moved back and forth along left rail on piston rod
And the follow-up trolley moved back and forth along right guide rail；The torsion device includes reversing seat, left handed twist oil cylinder, torq and right torsion
Oil cylinder, the torsion seat are installed on the ground, and the torq, which is rotatably installed in, to be reversed on seat, is respectively equipped with the both sides of torq
On the torsion seat, the left handed twist oil cylinder that makes torq twist and right torsion oil cylinder；The stretching device includes
Stretching seat on the ground and the stretching oil cylinder on the stretching seat, for pulling follow-up trolley are installed.
Wherein：The left rail and right guide rail are symmetricly set in the both sides of vehicle guide, and the left rail and right guide rail are
Upper and lower two layers, the left curved cylinder and right curved cylinder are arranged on left rail and the right guide rail of any layer；The left bending
The piston cylinder seat of oil cylinder and right curved cylinder is separately fixed on left rail and right guide rail, piston rod and the active dolly and with
Dynamic dolly is connected, and one end of the active dolly and follow-up trolley is the ring flange being connected with rubber tubing end flange face, separately
One end is slidably connected with the left rail and right guide rail respectively；One end of the vehicle guide extends active dolly and follow-up trolley
Between underface；
Alignment pin for being connected with the stretching oil cylinder is installed on the follow-up trolley；The left handed twist oil cylinder and the right side
The both sides that oil cylinder is symmetricly set on torq are reversed, the piston rod end of the left handed twist oil cylinder and right torsion oil cylinder is connected to
The both sides of seat are reversed, both sides of the piston cylinder seat respectively with the torq are connected.
The method of testing of the dynamic test equipment of rubber tubing (the present embodiment is extra large oil pipe) of the present invention：
The method of testing is divided into dynamic bending testing method, dynamic tensile testing method and dynamic and reverses survey
Method for testing, wherein：
When rubber tubing does dynamic bending experiment, by the end flange face of rubber tubing two be separately mounted to the active dolly and
On follow-up trolley, the center section of rubber tubing is by the bending dolly come Auxiliary support, the left curved cylinder and right bending
The piston rod of oil cylinder extends or shunk simultaneously, drives the active dolly and follow-up trolley to be done respectively along left rail, right guide rail past
Multiple motion, the center section of rubber tubing can move reciprocatingly with the bending dolly on vehicle guide；
When rubber tubing does dynamic tensile experiment, the active dolly on the left rail is removed, one end of rubber tubing
Flange face is arranged in the torq, and another end flange face is arranged on the follow-up trolley, the follow-up trolley and the drawing
The stretching oil cylinder stretched on seat is connected, and the tension test of rubber tubing is done by the flexible of stretching oil cylinder, rubber tubing
The center section bending dolly Auxiliary support；
When rubber tubing does dynamic torsion test, the active dolly on the left rail is removed, one end of rubber tubing
Flange face is arranged in the torq, and another end flange face is arranged on the follow-up trolley, the follow-up trolley and the drawing
The stretching oil cylinder stretched on seat is connected, and the center section of rubber tubing bends dolly Auxiliary support with described, the stretching oil cylinder
Piston rod extends, and when rubber tubing be in horizontality, the piston rod for stretching oil cylinder is kept into the state, described in startup
Reverse the left handed twist oil cylinder of seat both sides and right torsion oil cylinder, make the centre of gyration of the rubber tubing along the torsion seat counterclockwise with
Reciprocally swinging clockwise.
Wherein：When rubber tubing does dynamic tensile experiment, bending dolly transfixion on vehicle guide；In rubber
When plastic pipe does dynamic torsion test, start left handed twist oil cylinder, the right torsion oil cylinder for reversing seat both sides, make the left handed twist
The piston rod of oil cylinder is in elongation state, the right piston rod for reversing oil cylinder is in contraction state, or left handed twist oil
The piston rod of cylinder is in contraction state, the right piston rod for reversing oil cylinder is in elongation state, two kinds of working conditions it is reciprocal
Alternately, realize rubber tubing along it is described torsion seat the centre of gyration counterclockwise with reciprocally swinging clockwise.
As shown in figures 1-4, dynamic test equipment of the invention include bending dolly 13, vehicle guide 14, bending apparatus,
Stretching device and torsion device, wherein bending apparatus, stretching device and torsion device are fixed on flatly with independent posture
On face, stretching device and torsion device are provided with installation respectively positioned at the both sides of bending apparatus between stretching device and torsion device
Vehicle guide 14 on the ground, the vehicle guide 14 are provided with bending dolly 13 sliding back and forth.The one of vehicle guide 14
End extends the underface between active dolly 6 and follow-up trolley 7.
Bending apparatus is led including left rail 4, left curved cylinder 5, active dolly 6, follow-up trolley 7, right curved cylinder 9 and the right side
Rail 10, the left rail 4 and right guide rail 10 are symmetrically fixed on the ground of the both sides of vehicle guide 14, left curved cylinder 5 and right bending
Oil cylinder 9 is separately positioned on left rail 4 and right guide rail 10；Left rail 4 and right guide rail 10 are two layers up and down, left curved cylinder
5 and right curved cylinder 9 be arranged on any layer left rail 4 and right guide rail 10 on；The work of left curved cylinder 5 and right curved cylinder 9
Plug cylinder seat is separately fixed on left rail 4 and right guide rail 10, and piston rod is connected with active dolly 6 and follow-up trolley 7, active dolly
6 and one end of follow-up trolley 7 be the ring flange that is connected with rubber tubing end flange face, the other end is led by sliding block and a left side respectively
Rail 4 and right guide rail 10 are slidably connected, and can be moved back and forth along left rail 4 and right guide rail 10.
Torsion device includes torsion transposase 11, left handed twist oil cylinder 2, torq 3 and right torsion oil cylinder 15, the torsion transposase 11 and is fixed on
On ground, torq 3, which is rotatably installed in, to be turned round on transposase 11, is respectively equipped with the both sides of torq 3 on torsion transposase 11, is made torsion
The left handed twist oil cylinder 2 and right torsion oil cylinder 15 that rotary head 3 twists；Left handed twist oil cylinder 2 is symmetricly set on right torsion oil cylinder 15
The piston rod end of the both sides of torq 3, the left handed twist oil cylinder 2 and right torsion oil cylinder 15 is connected to the both sides for turning round transposase 11,
Both sides of the piston cylinder seat respectively with torq 3 are connected.
Stretching device include installation stretching seat 12 on the ground and on the stretching seat 12, it is servo-actuated small for pulling
The stretching oil cylinder 11 of car 7, the alignment pin 8 for being connected with stretching oil cylinder 11 is installed on follow-up trolley 7.
The method of testing of the dynamic test equipment of rubber tubing of the present invention is divided into dynamic bending testing method, dynamic is drawn
Testing method and dynamic torsion test method are stretched, wherein：
When rubber tubing does dynamic bending experiment, by the end flange face of rubber tubing two be separately fixed at active dolly 6 and with
On dynamic dolly 7, the center section of rubber tubing is fixed by bending dolly 13 come Auxiliary support, the piston cylinder seat of left curved cylinder 5
On left rail 4, its piston rod be connected with active dolly 6, the piston cylinder seat of right curved cylinder 9 is fixed on right guide rail 10, it
Piston rod is connected with follow-up trolley 7.The piston rod of left curved cylinder 5 and right curved cylinder 9 extends or shunk simultaneously, drives actively
Dolly 6 and follow-up trolley 7 move reciprocatingly along left rail 4, right guide rail 10 respectively, and the center section of rubber tubing can be with bending
Dolly 13 moves reciprocatingly on vehicle guide 14.
When rubber tubing does dynamic tensile experiment, manually the active dolly 6 on left rail 4 is removed, the one of rubber tubing
End flange face is fixed in torq 3, is turned round transposase 11 and is fixed by screws on ground, another end flange face of rubber tubing is consolidated
It is scheduled on follow-up trolley 7, the follow-up trolley 7 is connected with two stretching oil cylinders 11 on stretching seat 12 with two alignment pins 8, is passed through
The piston rod of stretching oil cylinder 11 stretches to do the tension test of rubber tubing, and the center section of rubber tubing uses bending dolly 13 auxiliary
Support is helped, bends the transfixion on vehicle guide 14 of dolly 13.
When rubber tubing does dynamic torsion test, manually the active dolly 6 on left rail 4 is removed, the one of rubber tubing
End flange face is fixed in torq 3, and torq 3 is connected by bearing with turning round transposase 11, and can be around the centre of gyration for turning round transposase 11
Swing；Another end flange face of rubber tubing is fixed on follow-up trolley 7, the follow-up trolley 7 and two drawings on stretching seat 12
Stretch oil cylinder 11 to be connected with two alignment pins 8, the center section bending Auxiliary support of dolly 13 of rubber tubing.Stretch oil cylinder
11 piston rod elongation, when rubber tubing is in naturally horizontally state, the piston rod for stretching oil cylinder 11 is kept into the elongate
State；Start the left handed twist oil cylinder 2 for turning round transposase 11 both sides and right torsion oil cylinder 15, ensure that the piston rod of left handed twist oil cylinder 2 is in elongation
State, the right piston rod for reversing oil cylinder 15 is in contraction state, or the piston rod of left handed twist oil cylinder 2 is in contraction state, right
The piston rod for reversing oil cylinder 15 is in elongation state, the past complex Alternating of both working conditions, realizes rubber tubing along torsion
Seat 1 the centre of gyration present counterclockwise with reciprocally swinging clockwise.
The present invention is not on the premise of rubber tubing surface quality is damaged, using hydraulic jack as dynamical element, to rubber tube
Road does corresponding bending, stretching and reverses three kinds of dynamics and tests, and is required according to the dynamic performance experiment of each rubber tubing, test
The performance data of corresponding rubber tubing.
The present invention relates to the extra large oil pipe dynamic test set electrical system controlled based on PLC, dynamic test set electrical system bag
Include PLC control system and connected touch-screen and dynamic test equipment；Equipment using Siemens's S7-300 series of PLC with
10 cun of touch-screens of refined type are formed, and are coordinated using digital quantity and analog module and inclination angle detection sensor, pressure sensor, drawing
Force snesor, linear displacement transducer, laser displacement sensor etc. are controlled and measured.Test load power exports, using liquid
Pressure power exports.Passing ratio valve control cylinder operating position and speed；Touch screen display system important parameter and to PLC systems
System is controlled.To ensure to detect the accuracy of data, for hydraulic actuating mechanism, present invention employs proportioning valve and laser position
Displacement sensor is as execution and feeds back original paper, and carries out the two close cycles control of Position And Velocity using PID modes in control algolithm
System.It is final to realize that dynamic test set completes three bending, torsion and stretching experiments to extra large oil pipe under the control of PLC system.
Present invention employs syndication platformization design, by three class testing process sets in an equipment.Substantially increase the comprehensive of equipment
Conjunction uses ability.Extra large oil pipe detection field belongs to pioneering at home for the invention.Hydrodynamic(al) of the existing extra large oil pipe manufacturing enterprise to product
Power is tested, most of to use static test, does not possess the continuous testing fatigue condition of dynamic.
The present invention includes PLC control system and connected touch-screen and dynamic test equipment.The PLC controls system
System includes PLC CPU and connected PROFIBUS modules, digital quantity I/O module, analog quantity I/O module, inclination angle detection pass
Sensor, pressure sensor, pulling force sensor, two linear displacement transducers, laser displacement sensors.As shown in figure 1, described incline
Angle detection sensor is on the disk in the outside of torq 3 of torsion device, torsion during for measuring torsion test to oil pipe
Angle；The pressure sensor is at each oil cylinder and pipeline connecting interface, for each in-oil cylinder real-time pressure；The pulling force
Sensor is at the internal circular disc axis centre of torq 3 of torsion device, for measuring in tension test to the pulling force of oil pipe；
Described two linear displacement transducers are respectively arranged on the relative section of the left rail 4 of bending apparatus, right guide rail 10, for measuring
The displacement of active dolly 6, follow-up trolley 7；The laser displacement sensor earthward projects shape located at left rail 4, right guide rail 10
Into straight line and make two vehicle guides 14 symmetrical and with the point of intersection of the center line of guide rail parallel, bend dolly 13 for measuring
Moving displacement.
The PLC control system is connected with touch-screen, the setting for extra large oil pipe dynamic test set electrical system systematic parameter
And the selection and control of experiment.The PLC control system can carry out three dynamic tests, be bend test respectively, reverse
Experiment and tension test.
The method of testing of extra large oil pipe dynamic test set electrical system based on PLC controls, comprises the following steps：
Setting, test operation and the data record of dynamic test parameter can be carried out by touch-screen, is passed through
PROFIBUS networks make to interact data between touch-screen and the CPU of PLC control system, and by controlling cable to realize, PLC is controlled
System signal interacts between system processed and hydraulic station control unit；
After PLC control system starts, select manually or automatically to operate on the touchscreen；Then which dynamic examination selection carries out
Test；Extra large oil pipe is fixed on corresponding experiment station according to the experiment to be carried out；Corresponding experiment ginseng is set on touch-screen
Number, then start hydraulic motor and oil pump, according to selected experiment, PLC control system exports corresponding parameter value to hydraulic station
Proportional reversing valve in, realize dynamic test set corresponding experiment action.
The parameter includes：Extra large oil pipe specifications parameter, windup-degree parameter, stretching displacement parameter, bending radius parameter.
System signal interacts between the PROFIBUS real-time performances PLC control system and touch screen operation unit, from
And realize and control whole dynamic test set electrical system on the touchscreen.
The hardware of the dynamic test set of the present invention is a set of series of PLC control systems of Siemens S7 300, designs 3 fatigues
Property testing experiment, respectively bend test, torsion test and tension test.PLC system uses PROFIBUS network communications, passes through
Touch-screen completes setting, test operation and the data record of the systematic parameter needed for experiment.The newest rich way of Siemens is relied on to compile
The PLC program that journey software platform carries out dynamic test using trapezoid figure language designs.The present invention is using PLC control system as in control
The heart, the test operation required by touch-screen auxiliary control dynamic test set, final realization are complete under the control of a set of PLC control system
Three fatigability dynamic testing experiments of paired extra large oil pipe.
As shown in Figure 5, electrical system includes PLC control system and touch-screen.Touch-screen passes through with PLC control system
PROFIBUS network communications, PLC control system and dynamic test equipment by controlling cable connection, three motors of major control and
Four proportional reversing valves (being respectively used to control left curved cylinder, right curved cylinder, left/right to reverse oil cylinder, stretching oil cylinder).It can adopt
With the oil cylinder needed for the motor control test of free time.Corresponding oil pump is opened after electric motor starting, proportional reversing valve is then adjusted by PLC
To change the position of valve element, so as to change the movement velocity of oil cylinder.
Touch-screen uses TP1200Comfort, and touch-screen is connected with PLC system by PROFIBUS networks, passes through touch
Screen completes setting and the test operation of all test parameters, while records important test data, can collect and monitor and operate in one
Body, realize the operational control of hommization.
The test technology flow of dynamic test set electrical system control is as follows：
As shown in fig. 6, equipment can carry out dynamic three kinds of tests and static extension test.During test, operating personnel will
Flexible pipe connection finishes, and need to recess test section, selects specific metering system (stretching, reverse, bend dynamic or stretching in operating space
It is static).Wherein, stretching is tested with reversing, and can individually be carried out, can also be combined progress.
Equipment can be tested automatically continuously, also can carry out operation test manually by operator.Data can be remembered automatically
Record or manually select record.
1. crooked test
The test can manually or automatically be run.According to the physical dimension situation of pipe, the final flexible most smaller part arrived is determined
Footpath；Meanwhile record the strength required for bending.
2. reverse test
The test, according to hose length, the angle measurement of maximum 2 °/meter of progress.Meanwhile record the power required for distortion
Amount.
3. extension test
When dynamic tensile is tested, pulling force can be born according to the maximum of pipe, record the tensile elongation change in follow-on test.It is quiet
When state is tested, the maximum holding tensile force for being no more than 50 tons can be applied to flexible pipe.
The present invention devises three kinds of automatic dynamic testing experiments, is bend test, torsion test, tension test respectively.It is curved
Bent experimental evidence process requirements enter Mobile state test, it is necessary to realize that flexible pipe bends right and left sync bit and speed control.Bending half
Footpath is measured by coaster displacement lasers sensor, and the cylinder displacement that bends right and left is measured by laser sensor, and changes 4~20MA signals,
Quantities is converted into after PLC analog module again.To ensure that the center of circle of bending radius overlaps with equipment center, need to pass through
Closed-loop control, ensure that the speed of left and right ends bending motion is synchronous with position.Wherein, left lateral bending curved-cylinder is actively, right lateral bending is bent
Cylinder is driven.Using displacement detecting as inner ring, and corresponding displacement PID controller is designed by PLC, by adjust proportioning valve come
Control the stroke of left bending cylinder；The stroke of left bending is set by PLC and speed and is detected on the basis of it, then by sensor
Relative displacement real-time relative velocity calculated by PLC be used as outer shroud, speed by PID controller is designed by PLC, adjusted with this
Save the speed of right bending cylinder so that the speed moment of right bending cylinder follows the speed of left bending cylinder, and in the opposite direction.By double
Closed loop PID regulation, realize that the bending cylinder of left and right two is run simultaneously, its block diagram is as shown in Figure 7.During on-test, two curved
Curved-cylinder is synchronous to carry out relative motion to inner side, and active dolly and follow-up trolley extruding oil pipe become bending, tubing bending it is same
When promote the bending dolly 13 below oil pipe center section to be moved forward along guide rail 14, the bending that laser displacement sensor detects
Dolly displacement is bending radius, sends return instruction after bending radius reaches sets target value, then by PLC, performs synchronization
Release movement, i.e. active dolly are synchronous with follow-up trolley to carry out relative motion laterally.It is discharged into behind original position to carry out bending again and moves
Make, record reaches pressure data during predefined curved radius.
Torsion test, it is necessary to realize the control of extra large oil pipe positive and negative windup-degree position, enters Mobile state test according to process requirements.
Windup-degree data, measured by range ± 45 ° obliquity sensor, and export 4~20MA current signals.Again by PLC's
Analog module, quantities is converted into after carrying out data acquisition, whenever set angle is reached, PLC sends turn-back instruction,
The torsion of the positive negative angle of extra large oil pipe is realized since then.Distortion power is 30Mpa pressure sensings by the range on fluid pressure line
Device measures, and pick-up is 4~20MA current signals.Pass through PLC analog module again, be converted into after carrying out data acquisition
Quantities.The maximum twist angular range of 2 °/meter is set according to pipe range, and when extra large oil pipe is torqued into the maximum angle of setting,
Record reverses force data.
Tension test according to process requirements, it is necessary to realize the matching relationship of tensile force and stretching displacement, enter Mobile state with it is quiet
The test of state.Pull force calculation data, performed by 60 tons of pulling force sensor of range, signal amplifier will load actual measurement pulling force and change
For 4~20MA current signals.Pass through PLC analog module again, quantities is converted into after carrying out data acquisition.Stretching displacement number
According to by the magnetic displacement transducer being mounted in advance in hydraulic cylinder, detecting the relative and absolute displacement of extra large oil pipe stretching.Pass through PLC again
Analog module, carry out data acquisition after be converted into quantities.When dynamic tensile is tested, according to default value of thrust scope,
When extra large oil pipe stretching power reaches preset value, and 10% of stretching displacement not less than pipe range, then the finger of release tensile force is provided by PLC
Order, when tensile force is close to " zero ", PLC provides the instruction for continuing stretching again, and this detection is repeated, and realizes sea since then
Oil pipe extension test repeatedly.
Claims (10)
1. the extra large oil pipe dynamic test set electrical system based on PLC controls, it is characterised in that：Including PLC control system and with
Its dynamic test equipment and touch-screen for connecting；The PLC control system is communicated with touch-screen by PROFIBUS；
Touch-screen, for input parameter and display test data；
Dynamic test equipment, for realizing the bending, stretching and torsion of extra large oil pipe；
PLC control system, for sending control command control dynamic test equipment action according to input parameter, and according to sensor
The data output of collection is to touch-screen.
2. the extra large oil pipe dynamic test set electrical system based on PLC controls, it is characterised in that the dynamic test equipment includes curved
Bent dolly (13), vehicle guide (14) and bending apparatus, stretching device, the torsion device being separately mounted on ground, wherein drawing
The both sides that device and torsion device are located at the bending apparatus respectively are stretched, installation is provided between the stretching device and torsion device
Vehicle guide (14) on the ground, the vehicle guide (14) are provided with bending dolly (13) sliding back and forth；The bending
Device includes left rail (4), left curved cylinder (5), active dolly (6), follow-up trolley (7), right curved cylinder (9) and right guide rail
(10), the left rail (4) and right guide rail (10) are separately mounted on the ground of the vehicle guide (14) both sides, the left bending
Oil cylinder (5) is separately positioned on left rail (4) and right guide rail (10) with right curved cylinder (9), is connected on piston rod
The active dolly (6) moved back and forth along left rail (4) and the follow-up trolley (7) moved back and forth along right guide rail (10)；The torsion
Device includes reversing seat (1), left handed twist oil cylinder (2), torq (3) and right torsion oil cylinder (15), and the torsion seat (1) is installed in ground
On face, the torq (3), which is rotatably installed in, to be reversed on seat (1), is respectively equipped with the both sides of torq (3) installed in the torsion
On swivel base (1), make left handed twist oil cylinder (2) and right torsion oil cylinder (15) that torq (3) twists；The stretching device includes
Stretching seat (12) on the ground and the stretching oil cylinder on the stretching seat (12), for pulling follow-up trolley (7) are installed
(11)。
3. the extra large oil pipe dynamic test set electrical system based on PLC controls as described in claim 2, it is characterised in that：It is described
Left rail (4) and right guide rail (10) are symmetricly set in the both sides of vehicle guide (14), and the left rail (4) and right guide rail (10) are
Upper and lower two layers, the left curved cylinder (5) and right curved cylinder (9) are arranged on the left rail (4) and right guide rail (10) of any layer
On.
4. the extra large oil pipe dynamic test set electrical system based on PLC controls as described in claim 3, it is characterised in that：It is described
The piston cylinder seat of left curved cylinder (5) and right curved cylinder (9) is separately fixed on left rail (4) and right guide rail (10), piston
Bar is connected with the active dolly (6) and follow-up trolley (7), and one end of the active dolly (6) and follow-up trolley (7) is and rubber
The ring flange of plastic pipe end flange face connection, the other end are slidably connected with the left rail (4) and right guide rail (10) respectively.
5. the extra large oil pipe dynamic test set electrical system based on PLC controls as described in claim 3, it is characterised in that：It is described
One end of vehicle guide (14) extends the underface between active dolly (6) and follow-up trolley (7).
6. the extra large oil pipe dynamic test set electrical system based on PLC controls as described in claim 2, it is characterised in that：It is described
Alignment pin (8) for being connected with the stretching oil cylinder (11) is installed on follow-up trolley (7).
7. the extra large oil pipe dynamic test set electrical system based on PLC controls as described in claim 2, it is characterised in that：It is described
Left handed twist oil cylinder (2) is symmetricly set on the both sides of torq (3), the left handed twist oil cylinder (2) and right torsion with right torsion oil cylinder (15)
Turn oil cylinder (15) piston rod end be connected to reverse seat (1) both sides, piston cylinder seat respectively with the torq (3)
Both sides are connected.
8. the extra large oil pipe dynamic test set electrical system based on PLC controls as described in claim 1, it is characterised in that described
PLC control system includes PLC and connected inclination angle detection sensor, pressure sensor, pulling force sensor, two straight lines
Displacement transducer, laser displacement sensor；Disk of the inclination angle detection sensor on the outside of the torq (3) of torsion device
On, to the windup-degree of oil pipe during for measuring torsion test；The pressure sensor is located at each oil cylinder and connecting pipe interface
Place, for each in-oil cylinder real-time pressure；The pulling force sensor is in torq (3) internal circular disc axis of torsion device
At the heart, for measuring in tension test to the pulling force of oil pipe；Described two linear displacement transducers are respectively arranged on bending apparatus
On the relative side of left rail (4), right guide rail (10), for measuring the displacement of active dolly (6), follow-up trolley (7)；It is described to swash
Optical displacement sensor earthward projects the straight line and vehicle guide (14) center line of formation located at left rail (4), right guide rail (10)
Point of intersection, for measure bending dolly (13) moving displacement.
9. the extra large oil pipe dynamic test set electric test method based on PLC controls, it is characterised in that comprise the following steps：
Touch-screen receives the kind of test of user's input, including bend test, torsion test, tension test；
If bend test, PLC is by controlling left curved cylinder (5), the right curved cylinder (9) of dynamic test equipment, band respectively
Dynamic active dolly (6), follow-up trolley (7) moves towards makes extra large tubing bending；PLC detects according to two linear displacement transducers
Active dolly (6), relative displacement between follow-up trolley (7), obtain active dolly (6), follow-up trolley (7) it is relatively fast in real time
Degree, realizes the synchronous operation of left curved cylinder (5), right curved cylinder (9)；The bending dolly (13) of laser displacement sensor detection
Displacement is the bending radius of extra large oil pipe；
If torsion test, PLC is by controlling the left handed twist oil cylinder (2) of dynamic test equipment to reverse extra large oil pipe, when inclination angle is examined
When the angle value of survey sensor feedback reaches set angle, PLC sends turn-back instruction by controlling dynamic test equipment
Right torsion oil cylinder (15) makes extra large oil pipe turn-back, realizes the torsion of the positive negative angle of extra large oil pipe；
If tension test：When static stretch is tested, PLC is by controlling the stretching oil cylinder (11) of dynamic test equipment to make to be servo-actuated
Dolly (7) drives extra large oil pipe stretching, and pulling force is detected by pulling force sensor；When dynamic tensile is tested, PLC is by controlling dynamic to survey
The stretching oil cylinder (11) of examination equipment makes follow-up trolley (7) drive extra large oil pipe stretching, and PLC detects extra large oil pipe by pulling force sensor and drawn
Stretch, when extra large oil pipe stretching power reaches preset value, then the instruction of release tensile force is provided by PLC, until tensile force reaches minimum
Untill value, the stretching repeatedly of extra large oil pipe is realized.
10. the extra large oil pipe dynamic test set electric test method according to claim 9 based on PLC controls, its feature exist
The relative displacement between active dolly (6) that the PLC detects according to two linear displacement transducers, follow-up trolley (7), is obtained
Real-time relative velocity to active dolly (6), follow-up trolley (7) comprises the following steps：
PLC detects the displacement of active dolly (6), follow-up trolley (7) according to two linear displacement transducers respectively；
Using the displacement detecting of active dolly (6) as inner ring, pass through displacement setting value and the displacement detecting value pair of active dolly (6)
Left curved cylinder (5) carries out PID control；
The real-time relative velocity of active dolly (6) and follow-up trolley (7) is worth to according to the displacement detecting of follow-up trolley (7), is entered
And value of feedback of the speed of active dolly (6) as outer shroud is obtained, according to the velocity amplitude and value of feedback of the active dolly (6) of setting
PID control is carried out to active dolly (6), exports displacement setting value of the displacement of active dolly (6) as inner ring.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540696A (en) * | 2019-01-10 | 2019-03-29 | 江苏华神特种橡胶制品股份有限公司 | A kind of rubber hose sub-assembly bend test device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419289A (en) * | 2011-12-21 | 2012-04-18 | 西安三维应力工程技术有限公司 | Full-size complex load mechanical testing machine of petroleum pipe |
| CN202256048U (en) * | 2011-09-27 | 2012-05-30 | 中国石油天然气集团公司 | Strain measurement device for full-size combined loading test of oil well pipe |
| CN104101545A (en) * | 2014-06-25 | 2014-10-15 | 中国海洋石油总公司 | Device for measuring flexural rigidity and torsional rigidity of hose |
| CN104181032A (en) * | 2014-09-10 | 2014-12-03 | 中天科技海缆有限公司 | Tension-torsion coupling rigidity testing device |
| CN104614250A (en) * | 2015-01-30 | 2015-05-13 | 大连理工大学 | Device for stimulating fatigue of marine flexible vertical pipe under practical condition |
| CN104849139A (en) * | 2015-04-21 | 2015-08-19 | 大连理工大学 | Multifunctional marine flexible pipe and cable rigidity test platform |
| US20150253228A1 (en) * | 2014-03-10 | 2015-09-10 | Dmar Engineering, Inc. | Fatigue testing |
| CN105466792A (en) * | 2016-01-26 | 2016-04-06 | 大连理工大学 | Movable ocean engineering flexible pipe cable torsion test device |
-
2016
- 2016-06-16 CN CN201610429922.3A patent/CN107515160B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202256048U (en) * | 2011-09-27 | 2012-05-30 | 中国石油天然气集团公司 | Strain measurement device for full-size combined loading test of oil well pipe |
| CN102419289A (en) * | 2011-12-21 | 2012-04-18 | 西安三维应力工程技术有限公司 | Full-size complex load mechanical testing machine of petroleum pipe |
| US20150253228A1 (en) * | 2014-03-10 | 2015-09-10 | Dmar Engineering, Inc. | Fatigue testing |
| CN104101545A (en) * | 2014-06-25 | 2014-10-15 | 中国海洋石油总公司 | Device for measuring flexural rigidity and torsional rigidity of hose |
| CN104181032A (en) * | 2014-09-10 | 2014-12-03 | 中天科技海缆有限公司 | Tension-torsion coupling rigidity testing device |
| CN104614250A (en) * | 2015-01-30 | 2015-05-13 | 大连理工大学 | Device for stimulating fatigue of marine flexible vertical pipe under practical condition |
| CN104849139A (en) * | 2015-04-21 | 2015-08-19 | 大连理工大学 | Multifunctional marine flexible pipe and cable rigidity test platform |
| CN105466792A (en) * | 2016-01-26 | 2016-04-06 | 大连理工大学 | Movable ocean engineering flexible pipe cable torsion test device |
Non-Patent Citations (2)
| Title |
|---|
| 中国制造网: "《https://cn.made-in-china.com/gongying/jnenuo5477-goPJZrKzgjRx.html》", 31 May 2016 * |
| 唐猛: "《中国优秀硕士学位论文全文数据库基础科学辑》", 15 January 2015 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540696A (en) * | 2019-01-10 | 2019-03-29 | 江苏华神特种橡胶制品股份有限公司 | A kind of rubber hose sub-assembly bend test device |
| CN109540696B (en) * | 2019-01-10 | 2023-11-21 | 江苏华神特种橡胶制品股份有限公司 | Bending test device for rubber hose assembly |
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