CN102012346A - Pipe joint separating force tester and testing method thereof - Google Patents
Pipe joint separating force tester and testing method thereof Download PDFInfo
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- CN102012346A CN102012346A CN 201010610729 CN201010610729A CN102012346A CN 102012346 A CN102012346 A CN 102012346A CN 201010610729 CN201010610729 CN 201010610729 CN 201010610729 A CN201010610729 A CN 201010610729A CN 102012346 A CN102012346 A CN 102012346A
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Abstract
The invention relates to a pipe joint separating force tester and a testing method thereof. A device and a method for testing the separating force resistance of a pipe joint under the working state are absent at present. The invention is characterized in that: the tester comprises a frame, a tension device with a pull rod, a pull rod connecting bolt, a strain gauge, a connecting rod, a movable nut, a pressure source and a pressure connecting device provided with a pressurizing hole, wherein the tension device and the pressure connecting device are arranged on the frame; the pressure source is connected with the pressurizing hole in the pressure connecting device; a threaded connection hole is formed on the top of the pressure connecting device; the threaded connection hole is communicated with the pressurizing hole and is positioned under the pull rod; the upper end of the strain gauge is arranged at the bottom end of the pull rod through the pull rod connecting bolt; and the movable nut is arranged at the lower end of the strain gauge through the connecting rod and is positioned over the threaded connection hole. The invention is reasonable in structural design, easy to operate and convenient to use, and can test the separating force resistance of the pipe joint under the working state.
Description
Technical field
The present invention relates to a kind of pipe adapter pull-out force testing machine and test method thereof, be mainly used in the anti-pull-out force performance of testing tube joint, be installed in pipe adapter on the traveling apparatus in particular for test, as be used for pipe adapter on automobile, train, subway, steamer, the aircraft etc., belong to a kind of device and test method thereof of testing tube joint performance.
Background technology
At present, the test that is used for the testing tube joint performance mainly is made up of withstand voltage test, explosion bulge test, pulse testing, vibration test, air-tight test and vacuum test, above-mentioned six kinds of tests are applied voltage test, and they are used to test the pipe adapter that is installed on the static equipment and have good effect really.But because the use face of pipe adapter is more and more wider, much run at high speed and pipe adapter all is installed in the pipeline on the equipment, as automobile, train, subway, steamer, more pipe adapter all is installed on the aircraft etc., if only adopt above-mentioned six kinds of test methods to test the performance that is used to be installed in the pipe adapter on the equipment of running at high speed is comprehensive inadequately, not only the working pressure of the pipe adapter inside on these equipment is bigger, and the weight of these equipment is very big usually, can there be very large inertia in these equipment in the process of running at high speed, in case the situation of brake hard appears in equipment, different parts on the equipment are because quality is inequality, their amount of force suffered under inertia effect is also inequality, thereby the situation of relative displacement occurs taking place between the different parts.If the pipe adapter on the equipment does not possess certain anti-pull-out force performance, in when, between the different parts relative displacement taking place on the equipment when, pipe adapter will be subjected to the pull-out force that produced between the different parts, thereby occur the pipe adapter phenomenon that pull-off is come out from pipeline, finally cause pipeline leakage, the equipment that makes is difficult to normal operation, the serious accident that the fatal crass also can occur.This shows, the pipe adapter that is installed on the equipment of running at high speed must possess certain anti-pull-out force performance, but also there is not a kind of device that is used for the anti-pull-out force performance of testing tube joint at present, more there is not a kind of device that is used for the anti-pull-out force performance of testing tube joint under in working order, promptly be used to test the anti-pull-out force performance when having working pressure in the pipe adapter, thereby buried huge potential safety hazard for the equipment of running at high speed, reduced the overall performance of the equipment of running at high speed.
People adopt the structure that changes pipe adapter to improve the pull-out force of pipe adapter usually now, as open day was on 03 01st, 2000, publication number is in the Chinese patent of CN2366667, a kind of pipe joint locking sleeve is disclosed, it is made up of body, in body, be provided with ring gear, its tube wall is provided with groove, though this pipe joint locking sleeve can improve the anti-pull-out force of pipe fitting joint greatly, thereby make the pipe fitting better tightness, but,, be difficult to better use such pipe joint locking sleeve owing to also be not used in the device of the anti-pull-out force performance of testing tube joint at present.Open for another example day is on 05 16th, 2007, publication number is in the Chinese patent of CN1963140, a kind of superhigh-pressure boring hose joint is disclosed, this superhigh-pressure boring hose joint comprises the linkage section that sleeve and core bar ring set join and constitute, on sleeve endoporus that constitutes linkage section and core bar outer round surface successively respectively corresponding matching be connected with anti-pulling-and-doffing section, seal section and transition section, anti-pulling-and-doffing section and seal section all are on sleeve endoporus and core bar outer round surface, be respectively equipped with a plurality of annular grooves and protruding corresponding matching or the sealing formation of joining, this superhigh-pressure boring hose joint tightens up by the locking which is provided with transition section, having prevented effectively that slipping away of sebific duct bore seal glue-line is outer moves the damage of tearing that is caused, and can effectively guarantee the anti-pulling-and-doffing performance and the sealing of rubber hose coupling.In like manner, though this superhigh-pressure boring hose joint can effectively improve the anti-pull-out force of pipe fitting joint,,, be difficult to better use such pipe joint locking sleeve owing to also be not used in the device of the anti-pull-out force performance of testing tube joint at present.
In sum, also there is not at present a kind of method that is used for the device of the anti-pull-out force performance of testing tube joint under in working order and is used for testing tube joint pull-out force performance, thereby be difficult to realize the reasonable use of pipe adapter, limited the applicable surface of pipe adapter to a certain extent, simultaneously, also be difficult to promote the overall performance of the equipment of running at high speed.
Summary of the invention
The objective of the invention is to overcome above shortcomings in the prior art, and provide a kind of reasonable in design, easy to manufacture, simple to operate, easy to use, high efficiency can test out the pipe adapter pull-out force testing machine and the test method thereof of the pull-out force performance of pipe adapter under in working order.
The present invention addresses the above problem the technical scheme that is adopted: the characteristics of this pipe adapter pull-out force testing machine are: comprise frame, the puller system that has pull bar, the pull bar coupling bolt, strainmeter, connecting link, traveling nut, pressure source and the pressure coupling arrangement that is provided with the pressurization hole, described puller system and pressure coupling arrangement are installed on the frame, described pressure source is connected with pressurization hole in the pressure coupling arrangement, the top of this pressure coupling arrangement is provided with threaded connection hole, described threaded connection hole is connected with the pressurization hole, this threaded connection hole be positioned at pull bar under, the upper end of described strainmeter is installed in the bottom of pull bar by the pull bar coupling bolt, described traveling nut is installed in the lower end of strainmeter by connecting link, this traveling nut be positioned at threaded connection hole directly over.
Pressure source of the present invention is the hydraulic pressure source.
Frame of the present invention comprises base, pressing plate and several column, and an end of described column all is fixed on the base, and the other end of this column all is fixed on the pressing plate, described pressing plate be positioned at base directly over; Described puller system and pressure coupling arrangement are installed in respectively on pressing plate and the base.
Puller system of the present invention is fluid pressure type puller system or vapour-pressure type puller system or electric motor type puller system.
The present invention also comprises oil collection box, and described oil collection box is installed on the frame, and this oil collection box matches with the pressure coupling arrangement.
The radical of column of the present invention is four.
The present invention utilizes the test method of pipe adapter pull-out force testing machine, it is characterized in that: this test method comprises test pipeline forming step, test pipeline positioning step, pressure test step and tensile test step successively;
(1) in the described test pipeline forming step, gets two pipe adapters to be tested earlier, then these two pipe adapters to be tested are connected respectively to the two ends of one section straight steel pipe and make the test pipeline;
(2) in the described test pipeline positioning step, the pipe adapter that will be arranged in above-mentioned test pipeline one end earlier is connected to the threaded connection hole of pressure coupling arrangement, the pipe adapter that will be positioned at the test pipeline other end again is connected on the traveling nut, and makes the test pipeline be in vertical state;
(3) in the described pressure test step, provide pressure by pressure source in the test pipeline, make that the pressure in the test pipeline reaches rated pressure, the pressure that will test then in the pipeline continues three minutes under rated pressure; In the pressure test step, if leakage phenomenon appears in the pipe adapter to be tested that is positioned on the test pipeline, then show the off quality of this pipe adapter, test to this pipe adapter leaves it at that, if leakage phenomenon does not appear in the pipe adapter to be tested that is positioned on the test pipeline, then enter next test procedure;
(4) in the described tensile test step, make the pressure in the test pipeline still be under the rated pressure, provide pulling force to come pipe adapter on the pull-out test pipeline by puller system, the pulling force that increases puller system gradually and produced, act on after the pulling force of test on the pipeline reach the specified pull-out force of pipe adapter until puller system, the pulling force that acts on the pipe adapter is continued three minutes under specified pull-out force; In the tensile test step, if the phenomenon of pull-off or leakage appears in tested pipe adapter, then show the off quality of this pipe adapter, if the phenomenon of pull-off or leakage does not appear in tested pipe adapter, then show the up-to-standard of this pipe adapter.
Pipe adapter to be tested of the present invention is ferrule-type compression joint or socket-welding fitting.
The present invention compared with prior art, have the following advantages and effect: can the testing tube joint pull-out force performance under in working order, promptly can test out the pull-out force performance of pipe adapter inside when being in working pressure, help better assessing the overall performance of pipe adapter, be convenient to pipe adapter and better use on the equipment of running at high speed, promoted the device ' of running at high speed.
The present invention can test different types of pipe adapter, and as testing ferrule-type compression joint, socket-welding fitting etc., applicable surface is wider.During use, elder generation is connected respectively to the two ends of steel pipe with two pipe adapters to be tested and forms one section test pipeline, then one of them pipe adapter is connected in the threaded connection hole of pressure coupling arrangement, another pipe adapter is connected on the traveling nut again.Pressure source is connected with pressurization hole in the pressure coupling arrangement, the threaded connection hole at pressure coupling arrangement top is connected with the pressurization hole, pressure is provided for the test pipeline by pressure source, make the pressure in the pipe adapter be in the rated pressure state, pipe adapter is continued three minutes under the rated pressure state.Come pipe adapter in the pull-out test pipeline by puller system then, the size requirements of the pulling capacity that puller system produced equates with the specified pull-out force of pipe adapter, the size of the pulling capacity that puller system produced can show by strainmeter, when puller system is started working, spur the pull bar coupling bolt by the pull bar in the puller system, again by pull bar coupling bolt pulling strainmeter, then by strainmeter pulling connecting link, again by connecting link pulling traveling nut, at last by traveling nut pulling test pipeline to be tested, puller system applies the time remaining three minutes of specified pull-out force on pipe adapter.As from the foregoing, in test process, test pipeline inside is in the rated pressure state all the time, if leakage phenomenon had not both taken place in pipe adapter in test process, also not from the steel pipe pull-off get off, illustrate that then the pull-out force performance of this pipe adapter meets the requirements; If the situation under the pull-off from the steel pipe appears in pipe adapter in test process, leakage phenomenon perhaps appears, illustrate that then the pull-out force performance of this pipe adapter is undesirable.The present invention once can test the pull-out force performance of two pipe adapters, high efficiency simultaneously.
Of the present invention simple in structure, reasonable in design, easy to manufacture, simple to operate, easy to use, market outlook are wide, help better promoting the better development of pipe adapter industry.
Description of drawings
Fig. 1 is the structural representation after the pipe adapter pull-out force testing machine in the embodiment of the invention removes pressure source.
Fig. 2 is with the structural representation on the pipe adapter pull-out force testing machine behind pipe adapter installation removing the in embodiments of the present invention pressure source to be tested.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and by embodiment, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment:
Referring to Fig. 1 to Fig. 2, pipe adapter pull-out force testing machine in the present embodiment comprises frame 1, has the puller system 2 of pull bar 21, pull bar coupling bolt 3, strainmeter 4, connecting link 5, traveling nut 6, be provided with pressure coupling arrangement 7, pressure source and the oil collection box 8 in pressurization 71 holes, wherein, pressure source is the hydraulic type pressure source, be that pressure source in the present embodiment can provide pressure by the mode of oil pressure, pressure source among the present invention also can adopt other forms of hydraulic pressure source, even can also use the Pneumatic pressure source.Said hydraulic pressure source and vapour-pressure type pressure source are common practise to one skilled in the art among the present invention, no longer describe in detail herein.Puller system 2 in the present embodiment is the hydraulic oil cylinder type puller system, puller system 2 among the present invention is generally mechanical puller system, as being fluid pressure type puller system or vapour-pressure type puller system or electric motor type puller system, fluid pressure type puller system or vapour-pressure type puller system or electric motor type puller system are all same as the prior art or close.
Pressure source in the present embodiment is connected with pressurization hole 71 in the pressure coupling arrangement 7, and the top of this pressure coupling arrangement 7 is provided with threaded connection hole, and threaded connection hole is connected with pressurization hole 71, this threaded connection hole be positioned at pull bar 21 under.Can transfer the pressure in the pressurization hole 71 by pressure source, this pressure is delivered in the threaded connection hole by pressurization hole 71 again, thereby reaches the purpose of pressure source voltage supply.
The upper end of strainmeter 4 is installed in the bottom of pull bar 21 in the present embodiment by pull bar coupling bolt 3, traveling nut 6 is installed in the lower end of strainmeter 4 by connecting link 5, this traveling nut 6 be positioned at threaded connection hole directly over, between traveling nut 6 and threaded connection hole, form a pipeline join domain.Pull bar 21 in the present embodiment can spur strainmeter 4 by pull bar coupling bolt 3, and the pulling force of pull bar is delivered on the connecting link 5 by strainmeter 4 again, is delivered on the traveling nut 6 by connecting link 5 again.Can test out the size of the pulling force that puller system 2 produces by strainmeter 4, strainmeter 4 is a kind of instruments that can be used to measure the pulling force size, and strainmeter 4 be a prior art, herein detailed description no longer.
Pipe adapter pull-out force testing machine in the present embodiment is mainly used in the anti-pull-out force performance that test is installed in the pipe adapter on the traveling apparatus, as be used for pipe adapter on automobile, train, subway, steamer, the aircraft etc., the kind of the pipe adapter that can test is more, as testing ferrule-type compression joint, socket-welding fitting etc.Utilize the test method of this pipe adapter pull-out force testing machine to comprise test pipeline forming step, test pipeline positioning step, pressure test step and tensile test step successively.
(1) at first tests the pipeline forming step, get two pipe adapters to be tested earlier, these two pipe adapters are respectively pipe adapter 91 and pipe adapter 92, then these two pipe adapters to be tested are connected respectively to the two ends of one section straight steel pipe 93 and make the test pipeline.
(2) test the pipeline positioning step then, the pipe adapter 91 that will be arranged in test pipeline one end earlier is connected to the threaded connection hole of pressure coupling arrangement 7, and this pipe adapter 91 is tightened in threaded connection hole; The pipe adapter 92 that will be positioned at the test pipeline other end then is connected on the traveling nut 6, by rotating traveling nut 6 pipe adapter 92 is tightened, two pipe adapters on the test pipeline all connect finish after, straight steel pipe 93 is in vertical state.Traveling nut 6 in the present embodiment can rotate, so the pipe adapter 91 of test pipeline one end will be connected in the threaded connection hole of pressure coupling arrangement 7 earlier, at this moment, the test pipeline just has been fixed on the pipe adapter pull-out force testing machine, by turning traveling nut 6, just can easily the pipe adapter 92 of the test pipeline other end be fixed then.
(3) carry out the pressure test step again, pressure source is connected with pressurization hole 71 in the pressure coupling arrangement 7, threaded connection hole in the pressure coupling arrangement 7 is connected with pressurization hole 71, pipe adapter 91 is connected in the threaded connection hole of pressure coupling arrangement 7, make pressure source can transfer the pressure in the pressurization hole 71, this pressure is delivered in the threaded connection hole by pressurization hole 71 again, thereby reach the purpose of pressure source voltage supply in the test pipeline, make all have pressure in pipe adapter 91, straight steel pipe 93 and the pipe adapter 92.In the test pipeline, provide pressure by pressure source, slowly increase force value, pressure in the feasible test pipeline reaches the rated pressure of pipe adapter, at this moment, pressure in pipe adapter 91 and the pipe adapter 92 all is in rated pressure, be equivalent to pipe adapter 91 and pipe adapter 92 all has been under the duty, the pressure that to test then in the pipeline continues three minutes under rated pressure, promptly make pressure in the developmental tube road continue rated pressure value three minutes, that is to say that the pressure in pipe adapter 91 and the pipe adapter 92 kept three minutes under rated pressure, after three minutes, the pressure test step finishes.In the pressure test step, leakage phenomenon appears if be positioned at the pipe adapter to be tested of test on the pipeline, then show the off quality of this pipe adapter, the test of this pipe adapter is left it at that; If leakage phenomenon does not appear in the pipe adapter to be tested that is positioned on the test pipeline, then enter the test of tensile test step.
(4) carry out the tensile test step at last, the pressure in the test pipeline still is under the rated pressure, in whole tensile test step, the pressure in the test pipeline is in rated pressure all the time.Present embodiment provides pulling force to come pipe adapter on the pull-out test pipeline by puller system 2, when puller system 2 is started working, spur pull bar coupling bolt 3 by the pull bar in the puller system 2 21, again by pull bar coupling bolt 3 pulling strainmeters 4, then by strainmeter 4 pulling connecting links 5, again by connecting link 5 pulling traveling nuts 6, at last by traveling nut 6 pullings test pipeline to be tested.Increase the pulling force that puller system 2 is produced gradually, act on after the pulling force of test on the pipeline reach the specified pull-out force of pipe adapter until puller system 2, the pulling force that acts on the pipe adapter is continued three minutes under specified pull-out force, promptly make and continue three minutes when act on pulling force on pipe adapter 91 and the pipe adapter 92 is specified pull-out force, after three minutes, the tensile test step finishes.In the tensile test step, if the phenomenon of pull-off or leakage appears in tested pipe adapter, then show the off quality of this pipe adapter, if the phenomenon of pull-off or leakage does not appear in tested pipe adapter, then show the up-to-standard of this pipe adapter.
After the tensile test step finishes, will test pipeline and disassemble, and then install next test pipeline to be tested and test from pipe adapter pull-out force testing machine.Utilize the test method of pipe adapter pull-out force testing machine can convenient, fast, effectively test out the pull-out force performance of pipe adapter under in working order among the present invention, help the pipe adapter better application to the equipment of running at high speed.In a collection of pipe adapter, the anti-pull-out force performance that can adopt the mode of sample testing to come the detector tube joint.
Pipe adapter pull-out force testing machine among the present invention in use, frame 1 normally is vertical state, certainly, this pipe adapter pull-out force testing machine also can be adjusted the position of frame 1 in use according to actual needs, as can be with frame 1 horizontal positioned, perhaps frame 1 is placed to and becomes any angle with surface level, even frame 1 can also be inverted, this is common practise to one skilled in the art.
Though the present invention with embodiment openly as above; but it is not in order to limit protection scope of the present invention; any technician who is familiar with this technology, change and the retouching done in not breaking away from design of the present invention and scope all should belong to protection scope of the present invention.
Claims (8)
1. pipe adapter pull-out force testing machine, it is characterized in that: comprise frame, the puller system that has pull bar, the pull bar coupling bolt, strainmeter, connecting link, traveling nut, pressure source and the pressure coupling arrangement that is provided with the pressurization hole, described puller system and pressure coupling arrangement are installed on the frame, described pressure source is connected with pressurization hole in the pressure coupling arrangement, the top of this pressure coupling arrangement is provided with threaded connection hole, described threaded connection hole is connected with the pressurization hole, this threaded connection hole be positioned at pull bar under, the upper end of described strainmeter is installed in the bottom of pull bar by the pull bar coupling bolt, described traveling nut is installed in the lower end of strainmeter by connecting link, this traveling nut be positioned at threaded connection hole directly over.
2. pipe adapter pull-out force testing machine according to claim 1 is characterized in that: described pressure source is the hydraulic pressure source.
3. pipe adapter pull-out force testing machine according to claim 1, it is characterized in that: described frame comprises base, pressing plate and several column, one end of described column all is fixed on the base, and the other end of this column all is fixed on the pressing plate, described pressing plate be positioned at base directly over; Described puller system and pressure coupling arrangement are installed in respectively on pressing plate and the base.
4. pipe adapter pull-out force testing machine according to claim 1 is characterized in that: described puller system is fluid pressure type puller system or vapour-pressure type puller system or electric motor type puller system.
5. pipe adapter pull-out force testing machine according to claim 2 is characterized in that: also comprise oil collection box, described oil collection box is installed on the frame, and this oil collection box matches with the pressure coupling arrangement.
6. pipe adapter pull-out force testing machine according to claim 3 is characterized in that: the radical of described column is four.
7. test method of utilizing each described pipe adapter pull-out force testing machine among the claim 1-6 is characterized in that: this test method comprises test pipeline forming step, test pipeline positioning step, pressure test step and tensile test step successively;
(1) in the described test pipeline forming step, gets two pipe adapters to be tested earlier, then these two pipe adapters to be tested are connected respectively to the two ends of one section straight steel pipe and make the test pipeline;
(2) in the described test pipeline positioning step, the pipe adapter that will be arranged in above-mentioned test pipeline one end earlier is connected to the threaded connection hole of pressure coupling arrangement, the pipe adapter that will be positioned at the test pipeline other end again is connected on the traveling nut, and makes the test pipeline be in vertical state;
(3) in the described pressure test step, provide pressure by pressure source in the test pipeline, make that the pressure in the test pipeline reaches rated pressure, the pressure that will test then in the pipeline continues three minutes under rated pressure; In the pressure test step, if leakage phenomenon appears in the pipe adapter to be tested that is positioned on the test pipeline, then show the off quality of this pipe adapter, test to this pipe adapter leaves it at that, if leakage phenomenon does not appear in the pipe adapter to be tested that is positioned on the test pipeline, then enter next test procedure;
(4) in the described tensile test step, make the pressure in the test pipeline still be under the rated pressure, provide pulling force to come pipe adapter on the pull-out test pipeline by puller system, the pulling force that increases puller system gradually and produced, act on after the pulling force of test on the pipeline reach the specified pull-out force of pipe adapter until puller system, the pulling force that acts on the pipe adapter is continued three minutes under specified pull-out force; In the tensile test step, if the phenomenon of pull-off or leakage appears in tested pipe adapter, then show the off quality of this pipe adapter, if the phenomenon of pull-off or leakage does not appear in tested pipe adapter, then show the up-to-standard of this pipe adapter.
8. test method according to claim 7 is characterized in that: described pipe adapter to be tested is ferrule-type compression joint or socket-welding fitting.
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| CN2010106107292A CN102012346B (en) | 2010-12-29 | 2010-12-29 | Pipe joint separating force tester and testing method thereof |
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| CN2010106107292A CN102012346B (en) | 2010-12-29 | 2010-12-29 | Pipe joint separating force tester and testing method thereof |
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| CN102288484A (en) * | 2011-05-12 | 2011-12-21 | 通标标准技术服务(上海)有限公司 | Performance testing method and performance testing device for plastic spiral cove |
| CN102680321A (en) * | 2012-05-18 | 2012-09-19 | 河海大学 | Lever-type drawing device for testing anchoring performance of planting bar and implementation method thereof |
| CN103712864A (en) * | 2013-12-31 | 2014-04-09 | 中建海峡建设发展有限公司 | Mechanical testing device for electrical construction |
| CN104535417A (en) * | 2014-12-01 | 2015-04-22 | 芜湖恒美电热器具有限公司 | Apparatus for detecting welding performance of steel pipe |
| CN106124322A (en) * | 2016-06-13 | 2016-11-16 | 歌尔股份有限公司 | Product can bear pulling capacity automatic detection device |
| CN112362213A (en) * | 2020-12-07 | 2021-02-12 | 东莞华贝电子科技有限公司 | Magnet drawing force testing device |
| CN112414684A (en) * | 2020-09-28 | 2021-02-26 | 顺科新能源技术股份有限公司 | Holding power testing device |
| CN114509345A (en) * | 2021-12-31 | 2022-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Hydraulic pipe joint connecting piece connection strength test device and test method |
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| CN102288484A (en) * | 2011-05-12 | 2011-12-21 | 通标标准技术服务(上海)有限公司 | Performance testing method and performance testing device for plastic spiral cove |
| CN102288484B (en) * | 2011-05-12 | 2013-04-24 | 通标标准技术服务(上海)有限公司 | Performance testing method and performance testing device for plastic spiral cove |
| CN102680321A (en) * | 2012-05-18 | 2012-09-19 | 河海大学 | Lever-type drawing device for testing anchoring performance of planting bar and implementation method thereof |
| CN103712864A (en) * | 2013-12-31 | 2014-04-09 | 中建海峡建设发展有限公司 | Mechanical testing device for electrical construction |
| CN103712864B (en) * | 2013-12-31 | 2015-11-18 | 中建海峡建设发展有限公司 | Electrical construction mechanics test device |
| CN104535417A (en) * | 2014-12-01 | 2015-04-22 | 芜湖恒美电热器具有限公司 | Apparatus for detecting welding performance of steel pipe |
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| CN106124322B (en) * | 2016-06-13 | 2019-10-18 | 歌尔股份有限公司 | Product can bear pulling capacity automatic detection device |
| CN112414684A (en) * | 2020-09-28 | 2021-02-26 | 顺科新能源技术股份有限公司 | Holding power testing device |
| CN112362213A (en) * | 2020-12-07 | 2021-02-12 | 东莞华贝电子科技有限公司 | Magnet drawing force testing device |
| CN112362213B (en) * | 2020-12-07 | 2022-06-07 | 东莞华贝电子科技有限公司 | Magnet drawing force testing device |
| CN114509345A (en) * | 2021-12-31 | 2022-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Hydraulic pipe joint connecting piece connection strength test device and test method |
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| CN102012346B (en) | 2012-05-09 |
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