CN1837773A - Method for testing breaking strength of mesh joints in lay type net patch - Google Patents
Method for testing breaking strength of mesh joints in lay type net patch Download PDFInfo
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- CN1837773A CN1837773A CN 200510024513 CN200510024513A CN1837773A CN 1837773 A CN1837773 A CN 1837773A CN 200510024513 CN200510024513 CN 200510024513 CN 200510024513 A CN200510024513 A CN 200510024513A CN 1837773 A CN1837773 A CN 1837773A
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Abstract
This invention relates to a method for testing breaking strength of mesh joints in lay type net patch. For the physical index test to joint-free fishing mesh, it is characteristic in: away the edge more than five meshes, intercepting the sample with one joint point as center; according to the direction of the joint point line, intercepting lines up and down with some length more than the effective line length within clamp 100mm+-1mm; paralleling the sample two mesh feet tightly but not overlap; holding the sample on strength tester by a plane clamp with effective widen more than 50mm for the test at 20+-2Deg and 63~67% relative humidity; after 20s+-3s as the average breaking time, determining the strength.
Description
Technical field
The present invention relates to fishing net sheet mesh physical index detection method.
Background technology
The net sheet is one of important materials of fish production.No matter be the various netting gears of marine fishing or fresh water fishing, the block that encloses in net cage still extra large, that freshwater aquiculture is used and lake, the reservoir all needs to use the net sheet.The structural shape of net sheet can be divided into junction type and no junction type two classes.In being arranged, junction type net sheet is divided into slip-knot, fast knot, double English knotted netting again; In no junction type net sheet, be divided into through compiling, insert sth. made by twisting, plain weave, twist net slice.Except that knotless joining type net sheet, above-mentioned variously have knot and knotless netting widely-used in the fishing for and culture of China's fish production, and knotless joining type net sheet is a kind of net sheet of new employing.Knotless joining type net sheet is compared with no tying-in volume type net sheet, has that filament strength utilization factor height, unit area net sheet are in light weight, net line structure closely is difficult for adhering to hydrobiological advantage.No junction type net sheet is difficult for scratch fish body, suitable high-density breeding and liked by the fisherman.But because the investment of production equipment of knotless joining type net sheet is big, domestic production enterprise is less at present, output is also little, need can satisfy the needs of home market from external import.
The mesh tubercle place of knotted netting and the mesh tie point of no tying-in netting sheet are the thin spots that mesh is born external force, the ultimate strength numerical value at this place has been represented the ultimate strength value of mesh, the leading indicator of estimating various net tablet qualities and safety in utilization is the ultimate strength of mesh, also is fishing gear and the net cage designer main foundation when selecting net sheet material, specification for use.
Detect the test method of knotted netting and no tying-in netting sheet mesh rupture strength, at standard GB/T4925-1985 " synthon fishing net sheet fracture powerful with breaking elongation test method " though in regulation is arranged, be the netting twine of intercepting certain-length on the net sheet in accordance with regulations, be held on the strength test aircraft measurements of constant speed stretching or isometric stretching, but the mesh rupture strength and the web fragment that detect knotless joining type net sheet by the regulation among the GB/T4925 split brute force, all can't carry out because of the slippage of mesh tie point.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method that detects knotless joining type net sheet mesh rupture strength.
Technical scheme of the present invention comprises intercepting sample, sample processing and strength test, it is characterized in that the position intercepting of sample more than distance twist net slice edge 5 orders, sample is the center with tie point of mesh, trend by this tie point netting twine, the netting twine of upper and lower intercepting certain-length, this length is greater than the effective length 100mm ± 1mm of netting twine between anchor clamps; With two order pin of each end of sample and tightly but not overlapping, adopting effective width is that the above flat anchor clamps of 50mm are held on the strength tester, test is in (20 ± 2) ℃, relative humidity is carried out for 63～67% times, the average rupture time of sample is 20s ± 3s, be stretched to the netting twine fracture at tested tie point place, measure the ultimate strength of this tie point.
Pair twist of the present invention is twisted with the fingers the tie point ultimate strength test of net mesh, do not have and once do not rupture at mesh tie point place, proof this method is simple and clear effectively practical reliable, for fishing gear and net cage design and the selection of material provide reliable basis, has the technique effect that remedies the deficiency among the GB/T4925.
Description of drawings
Fig. 1 represents twist net slice mesh tie point synoptic diagram.
Fig. 2 represents with fixing 4 the order pin synoptic diagram of mesh tie point of anchor clamps.
Fig. 3 represents the synoptic diagram of mesh tie point ultimate strength test sample.
Embodiment
Technical scheme of the present invention comprises intercepting sample, sample processing and strength test, the position intercepting of sample more than distance twist net slice edge 5 orders, sample is the center with a tie point 1 of mesh (see figure 1), trend by this tie point netting twine, the netting twine of upper and lower intercepting certain-length, this length is greater than the effective length 100mm ± 1mm (see figure 2) of netting twine between anchor clamps; Size of mesh can guarantee tested mesh tie point greater than 150mm upper and lower each 2 order foot are clamped by the upper and lower anchor clamps of strength tester (Fig. 22,3), can cut off upper and lower each 2 the order pin of this tie point, directly obtain the sample (seeing the left figure of Fig. 3) of this tie point ultimate strength test usefulness; When size of mesh less than 150mm, for guaranteeing by the order foot of survey grid sheet mesh tie point by the clamp clamps on the strength tester, sample must walk respectively to cut off up and down several order pin along what this tie point (the right figure of Fig. 3 1) located netting twine, and the residual wires thigh in the order pin is taken out; Then, with two order pin of each end of sample and tightly but not overlapping, adopting effective width is that the above flat anchor clamps of 50mm entirely are held on the strength tester, can install liner in the anchor clamps additional and crush or slippage to avoid sample; Sample visual testing is carried out under atmospheric conditions, test condition is in (20 ± 2) ℃, and relative humidity is carried out for 63～67% times, and the average rupture time of sample is 20s ± 3s, add the netting twine fracture that elongation or constant speed are stretched to tested tie point place by waiting, to measure the ultimate strength of this tie point; The mechanical type strength tester uses in 25%～75% scope of nominal range, and the electronic type strength tester can use in the gamut scope, and the pre-tension of sample is by standard GB/T6965 regulation.
Mesh tie point ultimate strength test institute measured value is the peak load value of this tie point.Sample is invalid in anchor clamps or disconnected point its data that rupture.
Claims (3)
1, breaking strength of mesh joints in lay type net patch method of testing, comprise intercepting sample, sample processing and strength test, it is characterized in that the position intercepting of sample more than distance twist net slice edge 5 orders, sample is the center with tie point of mesh, trend by this tie point netting twine, the netting twine of upper and lower intercepting certain-length, this length is greater than the effective length 100mm ± 1mm of netting twine between anchor clamps; With two order pin of each end of sample and tightly but not overlapping, adopting effective width is that the above flat anchor clamps of 50mm are held on the strength tester, test is in (20 ± 2) ℃, relative humidity is carried out for 63～67% times, the average rupture time of sample is 20s ± 3s, be stretched to the netting twine fracture at tested tie point place, measure the ultimate strength of this tie point.
2, breaking strength of mesh joints in lay type net patch method of testing according to claim 1, it is characterized in that sample along tie point place netting twine walk respectively to cut off up and down several order pin, and the residual wires thigh in the order pin is taken out.
3, breaking strength of mesh joints in lay type net patch method of testing according to claim 1 and 2 is characterized in that installing liner additional in the anchor clamps on the strength tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024513 CN1837773A (en) | 2005-03-22 | 2005-03-22 | Method for testing breaking strength of mesh joints in lay type net patch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024513 CN1837773A (en) | 2005-03-22 | 2005-03-22 | Method for testing breaking strength of mesh joints in lay type net patch |
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| Publication Number | Publication Date |
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| CN1837773A true CN1837773A (en) | 2006-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200510024513 Pending CN1837773A (en) | 2005-03-22 | 2005-03-22 | Method for testing breaking strength of mesh joints in lay type net patch |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614514B (en) * | 2008-06-23 | 2010-12-22 | 中国水产科学研究院东海水产研究所 | Method for quickly measuring breaking strength of geometric structure and mesh legs of netting meshes for netting gear |
| CN101328648B (en) * | 2007-06-18 | 2011-01-12 | 中国水产科学研究院东海水产研究所 | Reparing method of polyethylene twist netting for net box or purse net |
| CN101614634B (en) * | 2008-06-23 | 2011-01-12 | 中国水产科学研究院东海水产研究所 | Method for detecting opposite angle strength of fishing gear cod-end meshes of netting or trawl net of aquaculture net cage |
| CN101358913B (en) * | 2007-07-30 | 2011-04-06 | 中国水产科学研究院东海水产研究所 | Method for measuring physical properties of polyethylene plain net for fishing |
| CN101672741B (en) * | 2008-09-08 | 2011-09-21 | 中国水产科学研究院东海水产研究所 | Method for testing stress and deformation of meshes of fishing net |
| CN101377484B (en) * | 2007-08-29 | 2011-11-16 | 中国水产科学研究院东海水产研究所 | Method for measuring polyethylene inserting and twisting net sheet performance for cultivation and dragnet |
-
2005
- 2005-03-22 CN CN 200510024513 patent/CN1837773A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328648B (en) * | 2007-06-18 | 2011-01-12 | 中国水产科学研究院东海水产研究所 | Reparing method of polyethylene twist netting for net box or purse net |
| CN101358913B (en) * | 2007-07-30 | 2011-04-06 | 中国水产科学研究院东海水产研究所 | Method for measuring physical properties of polyethylene plain net for fishing |
| CN101377484B (en) * | 2007-08-29 | 2011-11-16 | 中国水产科学研究院东海水产研究所 | Method for measuring polyethylene inserting and twisting net sheet performance for cultivation and dragnet |
| CN101614514B (en) * | 2008-06-23 | 2010-12-22 | 中国水产科学研究院东海水产研究所 | Method for quickly measuring breaking strength of geometric structure and mesh legs of netting meshes for netting gear |
| CN101614634B (en) * | 2008-06-23 | 2011-01-12 | 中国水产科学研究院东海水产研究所 | Method for detecting opposite angle strength of fishing gear cod-end meshes of netting or trawl net of aquaculture net cage |
| CN101672741B (en) * | 2008-09-08 | 2011-09-21 | 中国水产科学研究院东海水产研究所 | Method for testing stress and deformation of meshes of fishing net |
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