CN104897487A - Method and system for testing minimum bending radius of full-size nonmetal pipe - Google Patents
Method and system for testing minimum bending radius of full-size nonmetal pipe Download PDFInfo
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Abstract
The invention discloses a method and a system for testing the minimum bending radius of a full-size nonmetal pipe. According to the fundamental principle of the method, a tested pipe is repeatedly bent in a reciprocating way, or the tested pipe is fixed on a bending test platform, load is applied to enable the tested pipe to bend to a certain bending radius, and then the pressure bearing performance of the nonmetal pipe in an adjusted bending state or a certain bending radius state can be tested by a hydrostatic pressure and bursting test system, and the minimum storage bending radius and the minimum working bending radius of the nonmetal pipe can be evaluated according to the hydrostatic performance and the short-time invalidation pressure value.
Description
Technical field
The present invention relates to minimum bending radius test and verification technique field, particularly one full-scale non-metal pipe minimum bending radius method of testing and system.
Background technology
The non-metal pipe of fine corrosion resistance is just becoming an important selection of oil-gas gathering and transportation pipeline.It is exactly flexible that non-metal pipe especially strengthens the maximum advantage of thermoplastic composite tube, has very little bending radius, and this advantage makes pipe crimping method lay becomes possibility, greatly saves laying cost; Make the storage of long distance tubing simultaneously and transport to become very convenient.But in non-metal pipe storage, installation and normal use procedure, when its be subject to be bent over its minimum bending radius (comprising minimum memory bending radius and minimum work bending radius) time, each component units of tubing is subject to Bending Influence, its performance index can obviously decline, and will have a strong impact on the military service performance and used life of non-metal pipe.Therefore, to dissimilar nonmetallic pipe product, how determined the minimum bending radius of such tubing by the serial experiment of simulated condition; Meanwhile, to the minimum bending radius of the non-metal pipe that manufacturer provides, how to carry out campaign, to verify whether it meets performance need, become the current problem needing solution badly.
For non-metal pipe minimum bending radius test, in the world existing experimental provision be all make for a certain feature bending radius fixedly account for seat, then tubing is laid according to the shape accounting for seat, reaches with it bending radius accounting for seat.Each test can only form the simulation of a kind of bending radius, if will do the crooked test of several groups of different radiis, then what need to manufacture several different radii fixedly accounts for seat, just unusual inconvenience of implementing like this and operate.
China Patent Publication No. is the file of CN102506665A, adopt the panel of two fan same shape sizes and supporting bolt to prepare a kind of Variable-Bend bilge radius experimental provision for the test of ocean flexible pipe cable minimum bending radius, it forms the configuration line of differently curved radius by the distance adjusting circular arc bolt and leveling screw.But also only can meet the bending radius requirement of radius scope (and must be 0.5 meter of increment) from 1 meter to 3 meters, performances evaluation criterion under not clear and definite tubing minimum bending radius.When tubing minimum bending radius is not clear and definite, also cannot carries out test by this device and determine.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of method simple possible, test period short one full-scale non-metal pipe minimum bending radius method of testing and system.
For achieving the above object, the present invention by the following technical solutions:
A kind of full-scale non-metal pipe minimum bending radius test macro, comprises chamber, is arranged on test platform in chamber, is also configured with heating system in chamber; Described test platform is provided with hydraulic actuator and drives the drive link doing linear reciprocating motion, drive link end is provided with the pipe clamping device for clamping in the middle part of developmental tube sample, hydraulic transmission control system is connected with hydraulic actuator, on test platform centered by drive link line, be equidistantly symmetrical arranged sliding recess and the screw that several are respectively used to assemble slide bolt and set bolt; The clamping to different bore developmental tube sample is completed by the position of adjustment slide bolt in sliding recess and set bolt, hydrostatic pressing bursting test machine is connected with described developmental tube sample by pressure-bearing sebific duct, hydrostatic pressing bursting test machine is connected with water pressure control system, arranges corresponding hydraulic testing parameter by water pressure control system.
Further, described drive link is fixed on described test platform by two adjustable spud piles.
Further, described adjustable spud pile is made up of holding ring and stud bolt, and described stud bolt two ends connect holding ring and test platform respectively.
Further, the upper end of described set bolt and described slide bolt is provided with rotational sleeve.
Further, described pipe clamping device is opposite opened, and realized closed by two half and half clasps, pipe clamping device is fixed by bolt and drive link.
Further, in described pipe clamping device, multiple clamp is set, and adopts fishbolt to fix, realize the tubing of the different bore of clamping.
Test a method for full-scale non-metal pipe minimum memory bending radius, comprise the following steps:
(1) preparation of samples: intercept developmental tube sample;
(2) tubing connects: developmental tube sample is connected to hydrostatic pressing bursting test machine;
(3) sample is placed: be first clamped in pipe clamping device by the middle part of developmental tube sample; Then according to length and the external diameter of developmental tube sample, determine the position of slide bolt and set bolt, complete gripping developmental tube sample two ends;
(4) bending system is arranged: the distance of two set bolts is set as chord length, bending radius is stored in conjunction with the developmental tube sample tentatively determined, calculate the distance of movement in the middle part of tubing, these data are input to hydraulic transmission control system, and setting back and forth bends number of times;
(5) cripping test: open hydraulic transmission control system, drives pipe clamping device to make developmental tube sample that back and forth bending occur by hydraulic actuator;
(6) load performance test: after cripping test terminates, recovering developmental tube sample is straightened condition, is full of water, airtight rear startup non-metal pipe hydrostatic pressing explosion bulge test system in developmental tube sample, according to developmental tube sample standard-required, carry out hydrostatic performance and failure pressure test in short-term;
(7) result judges: if the hydrostatic performance of developmental tube sample or in short-term failure pressure are below or above standard-required, then reduce or increase the storage bending radius of setting, repeat above step, until arrive the critical point of standard-required, the storage bending radius now set is the minimum memory bending radius of developmental tube sample.
Further, in step (5), test specimen is come and gone bending 10 times.
Test a method for the minimum work bending radius of full-scale non-metal pipe, comprise the following steps:
(1) preparation of samples: intercept developmental tube sample (7);
(2) tubing connects: developmental tube sample is connected to hydrostatic pressing bursting test machine (13);
(3) sample is placed: be first clamped in pipe clamping device (5) by developmental tube sample (7) middle part; Then according to length and the external diameter of developmental tube sample (7), determine the position of slide bolt (4) and set bolt (8), complete gripping developmental tube sample two ends;
(4) bending system is arranged: the distance of two set bolts (8) is set as chord length, in conjunction with developmental tube sample (7) the work bending radius tentatively determined, calculate the distance of movement in the middle part of tubing, these data are input to hydraulic transmission control system (16);
(5) state adjustment: open hydraulic transmission control system, under driving pipe clamping device to make developmental tube sample be in the work bending radius state of setting by hydraulic actuator, seal after subsequently developmental tube sample being full of water, open heating system, setting test temperature, and keep this state to wanting seeking time;
(6) load performance test: after state adjustment terminates, starts non-metal pipe hydrostatic pressing explosion bulge test system, according to developmental tube sample standard-required, carries out hydrostatic performance and failure pressure test in short-term;
(7) result judges: if the load performance of developmental tube sample under setting work bending radius meets standard-required, then continue bending tubing, reduce bending radius, repeat above step, until the load performance of non-metal pipe reaches the critical value of standard-required, the minimum work bending radius of bending radius now and developmental tube sample.
The invention provides a kind of method and pilot system of testing minimum work bending radius.The ultimate principle of the method test tubing is carried out reciprocating bending (by minimum memory bending radius), maybe test tubing is fixed on bending test platform, imposed load makes it be bent to certain bending radius (by minimum work bending radius), the load performance after bending state regulates or under certain bending radius state by hydrostatic pressing and explosion bulge test system testing non-metal pipe subsequently, with hydrostatic performance and in short-term failure pressure value (should meet relevant criterion require) evaluate the minimum memory bending radius of non-metal pipe and minimum work bending radius.
The invention has the beneficial effects as follows:
1, the invention provides the method for the full-scale non-metal pipe minimum bending radius of a kind of test (comprising minimum memory bending radius and minimum work bending radius), and give clear and definite judgment basis.Method of testing simple possible, test period are short, and judgment basis requires consistent with product standard, simple and clear.
2, as required, after relevant parameter (as displacement, reciprocal time etc.) is set in hydraulic transmission control system, hydraulic actuator motoring ring test pipe sample can be driven back and forth to bend, or under being still in certain bending radius state.This arranges simple, automaticity and testing efficiency high.
3, reciprocal bending is completed to developmental tube sample, or after being arranged under certain bending radius state, namely by arranging corresponding hydraulic testing parameter (as pressure, temperature, time etc.) in water pressure control system, the hydrostatic performance (short-term is with long-term) to described developmental tube sample and failure pressure test in short-term can automatically be completed subsequently.
Chamber in test unit of the present invention except there is safety protection function, the evaluation of full-scale non-metal pipe minimum bending radius under the heating system of configuration can complete condition of different temperatures.
Distance (chord length) between two set bolts of 1, clamp assay pipe sample is fixing can be surveyed, after sample bent radius is determined, by formulae discovery body arc length, drive pipe clamping device that developmental tube sample is bent by hydraulic actuator and reach calculating arc length value.
2, by selecting the position of slide bolt and set bolt, and adjusting the distance between slide bolt and set bolt (8), the test of different length, different bore, differently curved radius Pipe samples can be completed.
Further, in test unit, pipe clamping device is opposite opened, and arranges multiple clamp, can realize clamping and the evaluation of different caliber pipe material.
Be provided with rotational sleeve further, in the upper end of described set bolt and described slide bolt, moving freely when facilitating described developmental tube sample to bend, avoids the wearing and tearing to developmental tube sample.
Further, in test unit by the height of adjustment 2 adjustable spud piles, can guarantee that the center of circle of drive link and developmental tube sample is in same level line, prevent departing from of developmental tube sample, improve security and the degree of accuracy of test.
Accompanying drawing explanation
Accompanying drawing 1 full-scale non-metal pipe minimum bending radius pilot system schematic diagram;
Accompanying drawing 2 non-metal pipe two ends fixed clamp schematic diagram;
Accompanying drawing 3 non-metal pipe clamping transmission schematic diagram;
In figure: (1) chamber; (2) test platform; (3) sliding recess; (4) slide bolt; (5) pipe clamping device; (6) heating system; (7) developmental tube sample; (8) set bolt; (9) pressure-bearing sebific duct; (10) screw; (11) drive link; (12) adjustable spud pile; (13) hydrostatic pressing bursting test machine; (14) water pressure control system; (15) hydraulic actuator; (16) hydraulic transmission control system; (17) screw rod; (18) nut; (19) rotational sleeve; (20) half and half clasp; (21) clamp; (22) fishbolt; (23) bolt; (24) holding ring; (25) stud bolt.
Embodiment
Below by way of specific embodiments and the drawings, the present invention program is illustrated:
Provide a kind of method of testing full-scale non-metal pipe minimum memory bending radius: first test Pipe samples is placed on bending test platform by this method, bending 10 times are come and gone according to the minimum memory bending radius of tubing design, subsequently test specimen is kept straightened condition, seal and be connected with non-metal pipe hydrostatic pressing bursting test machine after filling water.The hydrostatic performance of the full-scale nonmetallic pipe sample under testing setup temperature and pressure condition (short-term and long-term) and in short-term failure pressure, and judge whether above result meets relevant criterion requirement.When meeting the critical value of standard-required, corresponding bending radius is the minimum memory bending radius of this nonmetallic pipe product.
Similarly, provide a kind of method of testing full-scale non-metal pipe minimum work bending radius: first the full-scale non-metal pipe of good seal inserts on bending test platform by this method, and be connected with non-metal pipe hydrostatic pressing bursting test machine.Tubing is curved to certain bending radius subsequently, after being full of water, under design temperature and pressure condition, the hydrostatic performance of test tubing under this bending radius (short-term is with long-term) and in short-term failure pressure.If the load performance of non-metal pipe under this bending radius meets standard-required, then continue bending tubing, reduce bending radius.Until the load performance of non-metal pipe reaches the critical value (as failure pressure is just 3 times of nominal pressures in short-term) of standard-required, bending radius is now the minimum work bending radius of non-metal pipe.
Verify that the method for full-scale non-metal pipe minimum bending radius is relatively simple: under the prerequisite of non-metal pipe minimum memory bending radius and minimum work bending radius is clearly provided in manufacturer, according to the full-scale non-metal pipe minimum memory bending radius of test and the method for minimum work bending radius, test hydrostatic performance (short-term and long-term) and the failure pressure in short-term of full-scale nonmetallic pipe sample under this bending radius condition.If above test result meets relevant criterion requirement, then assert that the minimum bending radius of the type nonmetallic pipe that manufacturer provides is feasible, otherwise infeasible.
Accordingly, the invention discloses a kind of pilot system evaluating full-scale non-metal pipe minimum bending radius, as shown in Figure 1.It comprises the modules such as bending test platform, bending control system, hydraulic testing system, heating and protective device.
As shown in Figure 1, described test platform 2 is with fixed placement such as bend testing apparatus such as developmental tube sample 7 grade in described chamber 1, and described chamber 1, except having safety protection function, is also configured with heating system 6, in order to Control experiment temperature.
As shown in Figure 1, on the base of described test platform 2 centered by drive link 11 line, be equidistantly symmetrical arranged several sliding recess 3 and screw 10, be respectively used to assembling slide bolt 4 and set bolt 8.Described pipe clamping device 5 is connected with described drive link 11 by described bolt 23 after being clamped by described developmental tube sample 7.Described drive link 11 is fixed on described test platform 2 by 2 described adjustable spud piles 12, and is connected to described hydraulic actuator 15.After completing corresponding optimum configurations (as displacement, reciprocal time etc.), described hydraulic transmission control system 16 drives described hydraulic actuator 15 to drive described drive link 11 and described pipe clamping device 5 to do linear reciprocating motion, completes the reciprocal bending to described developmental tube sample 7.
As shown in Figure 1, hydrostatic pressing bursting test machine 13 is connected with described developmental tube sample 7 by pressure-bearing sebific duct 9.After corresponding hydraulic testing parameter (as pressure, temperature, time etc.) is set in described water pressure control system 14, the hydrostatic performance (short-term is with long-term) to described developmental tube sample 7 and failure pressure test in short-term can be completed.
As shown in Figure 2, the two ends of described developmental tube sample 7 are clamped by described set bolt 8 and described slide bolt 4.Described set bolt 8 is threaded connection in the screw 10 of test platform 2.By tightening 2 nuts 18 of described slide bolt 4 screw rod 17 end, described slide bolt 4 is assemblied in the described sliding recess 3 of test platform 2.The upper end of described set bolt 8 and described slide bolt 4 is provided with rotational sleeve 19, moving freely when facilitating described developmental tube sample 7 to bend.By adjusting the position of described slide bolt 4 in described sliding recess 3, the clamping to different caliber pipe material can be completed.
As shown in Figure 3, the middle part of described developmental tube sample 7 clamps clamping by described pipe clamping device 5.Described pipe clamping device 5 is opposite opened, realizes closed by described 2 half and half clasps 20, and adopts described bolt 23 to fix.In described pipe clamping device 5, multiple described clamp 21 is set, and adopts described fishbolt 22 to fix, to realize the test of different caliber pipe material.Described pipe clamping device 5 is connected by described bolt 23 with described drive link 11.Set correlation parameter in described hydraulic transmission control system 16 after, drive described hydraulic actuator 15 and promote described drive link 11 and described pipe clamping device 5 to-and-fro movement, realizing the reciprocal bending of described developmental tube sample 7.Described drive link 11 interts in 2 described adjustable spud piles 12.Described adjustable spud pile 12 is made up of described holding ring 24 and described stud bolt 25.Described stud bolt 25 two ends connect described holding ring 24 and described test platform 2 respectively, and by controlling its degree of depth screwing in described test platform 2 to adjust the distance between described drive link 11 and described test platform, to guarantee that described drive link 11 is in same level line with the center of circle of described developmental tube sample 7.
Embodiment 1: under test room temperature condition, the polyvinyl piping materials minimum memory bending radius of DN150
(1) preparation of samples: intercepted length is that the polyvinyl piping materials of 1000mm is as developmental tube sample;
(2) tubing connects: the polyvinyl piping materials processed is connected to hydrostatic pressing bursting test machine;
(3) sample is placed: first select suitable clamp according to developmental tube sample outside dimension, and be clamped in pipe clamping device by the middle part of developmental tube sample; The height of adjustment 2 adjustable spud piles, guarantees that the center of circle of drive link and developmental tube sample is in same level line; According to length and the external diameter of developmental tube sample, determine the position of set bolt and slide bolt, complete gripping developmental tube sample two ends.
(4) bending system is arranged: the distance of two set bolts is set as chord length, stores bending radius in conjunction with the polyvinyl piping materials tentatively determined, calculates the distance of movement in the middle part of tubing.Above data are input to hydraulic transmission control system, and setting reciprocal bending number of times is 10.
(5) cripping test: open hydraulic transmission control system, drives pipe clamping device to make developmental tube sample that back and forth bending 10 times occur by hydraulic actuator.
(6) load performance test: after cripping test terminates, recovering developmental tube sample is straightened condition, is full of water, airtight rear startup non-metal pipe hydrostatic pressing explosion bulge test system in developmental tube sample, according to polyvinyl piping materials standard-required, carry out hydrostatic performance and failure pressure test in short-term.
(7) result judges: if the hydrostatic performance of polyvinyl piping materials or in short-term failure pressure are below or above standard-required, then reduce or increase the storage bending radius of setting, repeat above step, until arrive the critical point of standard-required, the storage bending radius now set is the minimum memory bending radius of DN150 polyvinyl piping materials.
Embodiment 2: under testing 50 DEG C of conditions, the minimum work bending radius of flexible composite pipe of DN100
(1) preparation of samples: intercepted length is that the flexible composite pipe of 1200mm is as developmental tube sample;
(2) tubing connects: the flexible composite pipe processed is connected to hydrostatic pressing bursting test machine;
(3) sample is placed: first select suitable clamp according to developmental tube sample outside dimension, and be clamped in pipe clamping device by the middle part of developmental tube sample; The height of adjustment 2 adjustable spud piles, guarantees that the center of circle of drive link and developmental tube sample is in same level line; According to length and the external diameter of developmental tube sample, determine the position of set bolt and slide bolt, complete gripping developmental tube sample two ends.
(4) bending system is arranged: the distance of two set bolts is set as chord length, in conjunction with the flexible composite pipe work bending radius tentatively determined, calculates the distance of movement in the middle part of tubing.Above data are input to hydraulic transmission control system.
(5) state adjustment: open hydraulic transmission control system, under driving pipe clamping device to make developmental tube sample be in the work bending radius state of setting by hydraulic actuator, seal after subsequently flexible composite pipe being full of water, open heating system, setting test temperature is 50 DEG C, and keeps this state 24h.
(6) load performance test: after state adjustment terminates, starts non-metal pipe hydrostatic pressing explosion bulge test system, according to flexible composite pipe standard-required, carries out hydrostatic performance and failure pressure test in short-term.
(7) result judges: if the load performance of flexible composite pipe under setting work bending radius meets standard-required, then continue bending tubing, reduce bending radius, repeat above step, until the load performance of non-metal pipe reaches the critical value (as failure pressure is just 3 times of nominal pressures in short-term) of standard-required, bending radius is now the minimum work bending radius of DN100 flexible composite pipe.
Embodiment 3: under checking room temperature condition, the polyvinyl piping materials minimum memory bending radius of DN150
(1) preparation of samples: intercepted length is that the polyvinyl piping materials of 1000mm is as developmental tube sample;
(2) tubing connects: the polyvinyl piping materials processed is connected to hydrostatic pressing bursting test machine;
(3) sample is placed: first select suitable clamp according to developmental tube sample outside dimension, and be clamped in pipe clamping device by the middle part of developmental tube sample; The height of adjustment 2 adjustable spud piles, guarantees that the center of circle of drive link and developmental tube sample is in same level line; According to length and the external diameter of developmental tube sample, determine the position of set bolt and slide bolt, complete gripping developmental tube sample two ends.
(4) bending system is arranged: the distance of two set bolts is set as chord length, in conjunction with the polyvinyl piping materials minimum memory bending radius that manufacturer provides, calculates the distance of movement in the middle part of tubing.Above data are input to hydraulic transmission control system, and setting reciprocal bending number of times is 10.
(5) cripping test: open hydraulic transmission control system, drives pipe clamping device to make developmental tube sample that back and forth bending 10 times occur by hydraulic actuator.
(6) load performance test: after cripping test terminates, recovering developmental tube sample is straightened condition, is full of water, airtight rear startup non-metal pipe hydrostatic pressing explosion bulge test system in developmental tube sample, according to polyvinyl piping materials standard-required, carry out hydrostatic performance and failure pressure test in short-term.
(7) result judges: if the hydrostatic performance of polyvinyl piping materials or in short-term failure pressure meet polyvinyl piping materials standard-required, then assert that the minimum memory bending radius of the DN150 polyvinyl piping materials that manufacturer provides is feasible, otherwise infeasible.
Embodiment 4: under verifying 50 DEG C of conditions, the minimum work bending radius of flexible composite pipe of DN100
(1) preparation of samples: intercepted length is that the flexible composite pipe of 1200mm is as developmental tube sample;
(2) tubing connects: the flexible composite pipe processed is connected to hydrostatic pressing bursting test machine;
(3) sample is placed: first select suitable clamp according to developmental tube sample outside dimension, and be clamped in pipe clamping device by the middle part of developmental tube sample; The height of adjustment 2 adjustable spud piles, guarantees that the center of circle of drive link and developmental tube sample is in same level line; According to length and the external diameter of developmental tube sample, determine the position of set bolt and slide bolt, complete gripping developmental tube sample two ends.
(4) bending system is arranged: the distance of two set bolts is set as chord length, in conjunction with the minimum work bending radius of flexible composite pipe that manufacturer provides, calculates the distance of movement in the middle part of tubing.Above data are input to hydraulic transmission control system.
(5) state adjustment: open hydraulic transmission control system, under driving pipe clamping device to make developmental tube sample be in the minimum work bending radius state of setting by hydraulic actuator, seal after subsequently flexible composite pipe being full of water, open heating system, setting test temperature is 50 DEG C, and keeps this state 24h.
(6) load performance test: after state adjustment terminates, starts non-metal pipe hydrostatic pressing explosion bulge test system, according to flexible composite pipe standard-required, carries out hydrostatic performance and failure pressure test in short-term.
(7) result judges: if the load performance of flexible composite pipe meets standard-required, then assert that the minimum work bending radius of the DN100 flexible composite pipe that manufacturer provides is feasible, otherwise infeasible.
Claims (9)
1. a full-scale non-metal pipe minimum bending radius test macro, it is characterized in that: comprise chamber (1), be arranged on test platform (2) in chamber (1), in chamber (1), be also configured with heating system (6); Described test platform (2) is provided with hydraulic actuator (15) and drives the drive link (11) doing linear reciprocating motion, drive link (11) end is provided with the pipe clamping device (5) for clamping developmental tube sample (7) middle part, hydraulic transmission control system (16) is connected with hydraulic actuator (15), on test platform (2) centered by drive link (11) line, be equidistantly symmetrical arranged several and be respectively used to assemble slide bolt (4) and the sliding recess (3) of set bolt (8) and screw (10); The clamping to different bore developmental tube sample (7) is completed by adjustment slide bolt (4) position in sliding recess (3) and set bolt (8), hydrostatic pressing bursting test machine (13) is connected with described developmental tube sample (7) by pressure-bearing sebific duct (9), hydrostatic pressing bursting test machine (13) is connected with water pressure control system (14), arranges corresponding hydraulic testing parameter by water pressure control system (14).
2. full-scale non-metal pipe minimum bending radius test macro according to claim 1, is characterized in that: described drive link (11) is fixed on described test platform (2) by two adjustable spud piles (12).
3. full-scale non-metal pipe minimum bending radius test macro according to claim 2, it is characterized in that: described adjustable spud pile (12) is made up of holding ring (24) and stud bolt (25), described stud bolt (25) two ends connect holding ring (24) and test platform (2) respectively.
4. full-scale non-metal pipe minimum bending radius test macro according to claim 1, is characterized in that: the upper end of described set bolt (8) and described slide bolt (4) is provided with rotational sleeve (19).
5. full-scale non-metal pipe minimum bending radius test macro according to claim 1, it is characterized in that: described pipe clamping device (5) is opposite opened, realized closed by two half and half clasps (20), pipe clamping device (5) is fixed by bolt (23) and drive link (11).
6. full-scale non-metal pipe minimum bending radius test macro according to claim 5, it is characterized in that: multiple clamp (21) is set in described pipe clamping device (5), and adopt fishbolt (22) to fix, realize the tubing of the different bore of clamping.
7. adopt a method for non-metal pipe minimum memory bending radius as full-scale in claim 1-6 system testing, it is characterized in that comprising the following steps:
(1) preparation of samples: intercept developmental tube sample (7);
(2) tubing connects: developmental tube sample is connected to hydrostatic pressing bursting test machine (13);
(3) sample is placed: be first clamped in pipe clamping device (5) by developmental tube sample (7) middle part; Then according to length and the external diameter of developmental tube sample (7), determine the position of slide bolt (4) and set bolt (8), complete gripping developmental tube sample two ends;
(4) bending system is arranged: the distance of two set bolts (8) is set as chord length, bending radius is stored in conjunction with the developmental tube sample (7) tentatively determined, calculate the distance of movement in the middle part of tubing, these data are input to hydraulic transmission control system (16), and setting back and forth bends number of times;
(5) cripping test: open hydraulic transmission control system, drives pipe clamping device to make developmental tube sample that back and forth bending occur by hydraulic actuator;
(6) load performance test: after cripping test terminates, recovering developmental tube sample is straightened condition, water is full of in developmental tube sample, airtight rear startup non-metal pipe hydrostatic pressing explosion bulge test system, according to developmental tube sample (7) standard-required, carry out hydrostatic performance and failure pressure test in short-term;
(7) result judges: if the hydrostatic performance of developmental tube sample (7) or in short-term failure pressure are below or above standard-required, then reduce or increase the storage bending radius of setting, repeat above step, until arrive the critical point of standard-required, the storage bending radius now set is the minimum memory bending radius of developmental tube sample (7).
8. method according to claim 7, is characterized in that: in step (5), test specimen is come and gone bending 10 times.
9. adopt a method for the minimum work bending radius of non-metal pipe as full-scale in claim 1-6 system testing, it is characterized in that comprising the following steps:
(1) preparation of samples: intercept developmental tube sample (7);
(2) tubing connects: developmental tube sample is connected to hydrostatic pressing bursting test machine (13);
(3) sample is placed: be first clamped in pipe clamping device (5) by developmental tube sample (7) middle part; Then according to length and the external diameter of developmental tube sample (7), determine the position of slide bolt (4) and set bolt (8), complete gripping developmental tube sample two ends;
(4) bending system is arranged: the distance of two set bolts (8) is set as chord length, in conjunction with developmental tube sample (7) the work bending radius tentatively determined, calculate the distance of movement in the middle part of tubing, these data are input to hydraulic transmission control system (16);
(5) state adjustment: open hydraulic transmission control system, under driving pipe clamping device to make developmental tube sample be in the work bending radius state of setting by hydraulic actuator, seal after subsequently developmental tube sample being full of water, open heating system, setting test temperature, and keep this state to wanting seeking time;
(6) load performance test: after state adjustment terminates, starts non-metal pipe hydrostatic pressing explosion bulge test system, according to developmental tube sample standard-required, carries out hydrostatic performance and failure pressure test in short-term;
(7) result judges: if the load performance of developmental tube sample under setting work bending radius meets standard-required, then continue bending tubing, reduce bending radius, repeat above step, until the load performance of non-metal pipe reaches the critical value of standard-required, the minimum work bending radius of bending radius now and developmental tube sample.
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| CN110986856A (en) * | 2019-11-21 | 2020-04-10 | 中国船舶重工集团公司第七0五研究所 | Hose bending radius test equipment |
| CN112683129A (en) * | 2020-12-03 | 2021-04-20 | 国网北京市电力公司 | Method for detecting minimum bending radius of cable |
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| CN106706410A (en) * | 2016-11-09 | 2017-05-24 | 中国电力科学研究院 | Aluminum alloy strip lock-armo cable flexibility test device and aluminum alloy strip lock-armo cable flexibility test method |
| CN106706410B (en) * | 2016-11-09 | 2021-06-22 | 中国电力科学研究院 | Aluminum alloy strip interlocking armored cable flexibility test device and method |
| CN109675979A (en) * | 2019-03-07 | 2019-04-26 | 铁正检测科技有限公司 | A kind of fan formula metal bellows plane bending device |
| CN109675979B (en) * | 2019-03-07 | 2024-06-04 | 铁正检测科技有限公司 | Fan-type metal corrugated pipe plane bending device |
| CN110986856A (en) * | 2019-11-21 | 2020-04-10 | 中国船舶重工集团公司第七0五研究所 | Hose bending radius test equipment |
| CN110986856B (en) * | 2019-11-21 | 2021-08-10 | 中国船舶重工集团公司第七0五研究所 | Hose bending radius test equipment |
| CN112683129A (en) * | 2020-12-03 | 2021-04-20 | 国网北京市电力公司 | Method for detecting minimum bending radius of cable |
| CN114034542A (en) * | 2021-11-02 | 2022-02-11 | 铜陵精达新技术开发有限公司 | Pressure resistance detection equipment and method for enameled wire production |
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