CN106950176B - Device and method for testing normal bonding strength of icing and wire interface of overhead transmission line - Google Patents
Device and method for testing normal bonding strength of icing and wire interface of overhead transmission line Download PDFInfo
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- CN106950176B CN106950176B CN201710299867.5A CN201710299867A CN106950176B CN 106950176 B CN106950176 B CN 106950176B CN 201710299867 A CN201710299867 A CN 201710299867A CN 106950176 B CN106950176 B CN 106950176B
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- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention discloses a device and a method for testing normal bonding strength of an ice coating and a wire interface of an overhead transmission line, wherein the device comprises the following components: the semi-cylindrical ice coating containing die, a power transmission line holding die and a pre-tightening bolt. The invention has the advantages that: (1) The test device has a simple structure, can test the normal bonding strength of the wire interface of the icing and the cylindrical surface, not only widens the test range of the bonding strength of the icing and the wire, but also can effectively ensure the test precision; (2) The testing device can be used repeatedly, so that the testing cost is reduced; and (3) the testing method is simple and easy to operate.
Description
Technical Field
The invention relates to a testing device and a testing method, in particular to a device and a method for testing normal bonding strength of an icing and wire interface of an overhead transmission line.
Background
The wide range of the operators in China, the mountain and the river are vertically and horizontally changed, the weather is changeable, the cold and hot air flows meet each other from winter to early spring, and the icing accident is easily formed on the overhead conductor when the extreme environment climate is met. When the working stress of the wire or the tower exceeds the design value due to the weight of the ice coating, the wire breakage and the tower falling are caused to have serious consequences.
At present, the deicing technology of the overhead transmission line comprises main deicing methods such as thermal deicing, mechanical deicing, natural passive deicing and the like. Among them, mechanical deicing is attracting attention due to the characteristics of low energy consumption and low price, however, various mechanical deicing methods are difficult to adapt to different icing structures, and the bonding strength between the icing and the wire must be known in order to make the deicing method targeted. The magnitude of the tangential bond strength between the ice coating and the surface of the overhead conductor is an important physical property of ice that determines the amount of energy to break the ice, and different mechanical deicing methods are selected based on the different bond strengths between the ice coating and the conductor. Therefore, it is necessary to study the bonding strength between ice and wire.
Up to now, studies on bonding strength of ice coating and wire at home and abroad have mainly focused on shear bonding strength. For example:
ASTM D3528-96 (2002), proposes a double lap test shear stress protocol for testing the shear bond strength between ice and a substrate;
after ice is covered in the cylinder, the cylindrical ice cover is pulled out to test the shearing bonding strength between the ice and the cylinder in the naval laboratory;
the chinese patent documents CN1321881a and CN101482489B propose methods for testing the normal bonding strength between a substrate and a coating or icing, but these two methods and devices are too complex, and only the structure with a planar surface can be tested, and the bonding strength between the wire with a cylindrical surface and the icing cannot be provided, so that the application and range of these two methods are limited.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a device and a method for testing the normal bonding strength of a wire interface of ice coating and a cylindrical surface of an overhead transmission line.
In order to achieve the above object, the present invention adopts the following technical scheme:
the preparation device of semi-cylindrical ice-coated power transmission line sample is characterized by comprising: a horizontal bearing platform 7, a locking device backup plate (5), a rubber sealing gasket (2), a hexagonal nut (3), a locking sleeve 8, a locking nail 9 and a power transmission line (1), wherein,
the horizontal bearing platform 7 is provided with a semi-cylindrical cavity, and the wall of the semi-cylindrical cavity is coated with an anti-icing coating (4);
the backup plates (5) of the locking device are arranged at two ends of the horizontal bearing platform 7, and through holes for the transmission line (1) to pass through are reserved on the backup plates;
the rubber sealing gasket (2) and the hexagonal nut (3) are sequentially arranged on the outer side of the backup plate (5) of the locking device, and the locking sleeve 8 is arranged in a hole of the hexagonal nut (3);
the two ends of the power transmission line (1) sequentially pass through a locking device backup plate (5), a rubber sealing gasket (2) and a locking sleeve 8;
the locking nails 9 radially penetrate the locking sleeve 8, and the power transmission line (1) is fixed from two sides, so that the power transmission line (1) is kept in a straight line state when the ice-covered wire is prepared.
The preparation device of the semi-cylindrical ice-coated power transmission line sample is characterized in that the horizontal bearing platform 7 is made of stainless steel.
The preparation device of the semi-cylindrical ice-coated power transmission line sample is characterized in that the anti-icing coating (4) adopts a Cheng Weihua ZS-611 anti-icing coating with the thickness of 0.1mm.
The device for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line is characterized by comprising: a semi-cylindrical ice coating accommodating mould (10), a power transmission line holding mould (20) and a pre-tightening bolt (30), wherein,
the semi-cylindrical ice coating accommodating die (10) consists of an upper clamping handle (101) and a semi-cylindrical cavity (102), wherein the semi-cylindrical cavity (102) is used for accommodating the semi-cylindrical ice coating 6 and is of a semi-closed structure, a gap for exposing the power transmission line (1) is reserved along the axis, and the width of the gap is not smaller than the diameter of the power transmission line (1);
the power transmission line holding force die (20) consists of a lower clamping handle (201) and a supporting arm (202), wherein the supporting arm (202) is used for supporting the power transmission line (1), a holding force ring (203) is formed at the upper end of the supporting arm, the inner diameter of the holding force ring (203) is matched with the outer diameter of the power transmission line (1), and the power transmission line can be sleeved on the power transmission line (1);
the pre-tightening bolt (30) is arranged outside the holding ring (203) and can be sleeved on the power transmission line (1) for fixing the power transmission line (1) in the holding ring (203).
The device for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line is characterized in that the semi-cylindrical ice coating accommodating die (10) and the transmission line holding die (20) are made of stainless steel.
The device for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line is characterized in that in the structure of the semi-cylindrical ice coating accommodating mold (10), the length of the upper clamping handle (101) is not less than 80mm, the radius of the cross section of the semi-cylindrical cavity (102) is not less than 60mm, and the length of the cavity is not less than 200mm.
The device for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line is characterized in that in the structure of the transmission line holding force die (20), the length of the lower clamping handle (201) is not less than 80mm.
The method for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line is characterized by comprising the following steps:
step1: preparing a semi-cylindrical ice-coated power transmission line sample by using the preparation device of the semi-cylindrical ice-coated power transmission line sample;
step2: loading the semi-cylindrical ice-coated power transmission line sample into the device for testing the normal bonding strength of the ice coating and the wire interface of the overhead power transmission line;
step3: mounting a device with a semi-cylindrical ice-coated power transmission line sample on a stretcher, and performing a stretching experiment by taking the end of the upper clamping handle (101) as the upper clamping end until the ice coating 6 is completely separated from the power transmission line (1), and finishing loading;
step4: calculating normal bonding strength sigma of the icing and the wire interface according to the following formula b ：
Wherein F is b For the load obtained by the stretcher test, D is the diameter of the transmission line, and L is the length of ice coating on the transmission line.
The invention has the advantages that:
(1) Preparation device of semi-cylindrical icing power transmission line sample: the semi-cylindrical ice-coated power transmission line sample can be prepared, and is a precondition and guarantee of the testing method of the invention;
(2) Device for testing normal bonding strength of ice coating and wire interface: the device has a simple structure, can test the normal bonding strength of the wire interface of the ice coating and the cylindrical surface, not only widens the testing range of the bonding strength of the ice coating and the wire, but also can effectively ensure the testing precision; the device can be repeatedly used, and the test cost is reduced;
(3) The method for testing the normal bonding strength of the ice coating and the wire interface comprises the following steps: the operation is simple and easy; the thickness of the ice coating can be tested in a range smaller than that of the semi-cylindrical ice coating accommodating mould; the icing bonding strength of the power transmission line with various diameters can be tested in the range of being smaller than the diameter of the force holding ring.
Drawings
Fig. 1 is a front view of a device for preparing a semi-cylindrical ice coated power transmission line sample of the present invention;
FIG. 2 is a bottom view of the preparation device of FIG. 1;
fig. 3 is a schematic view of a locking sleeve and locking pin locking the power line;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a front view of the apparatus for testing the normal bond strength of an ice coating to a wire interface of the present invention;
fig. 6 is a left side view of the device of fig. 5.
Meaning of reference numerals in the drawings:
1-transmission lines, 2-rubber sealing gaskets, 3-hexagonal nuts, 4-anti-icing coatings, 5-locking device backup plates, 6-icing, 7-horizontal bearing platforms, 8-locking sleeves and 9-locking nails;
10-semi-cylindrical ice coating accommodating molds, 101-upper clamping handles and 102-semi-cylindrical cavities;
20-power transmission line holding force dies, 201-lower clamping handles, 202-supporting arms and 203-holding force rings;
30-pre-tightening the bolts.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments.
A first part: preparation device for semi-cylindrical ice-coated power transmission line sample
Referring to fig. 1, 2, 3 and 4, the apparatus for preparing a semi-cylindrical ice coated power transmission line sample according to the present invention includes: the horizontal bearing platform 7, the locking device backup plate 5, the rubber sealing gasket 2, the hexagonal nut 3, the locking sleeve 8, the locking nail 9 and the power transmission line 1.
The horizontal bearing platform 7 is made of stainless steel and is provided with a semi-cylindrical cavity, the wall of the semi-cylindrical cavity is coated with the anti-icing coating 4, the anti-icing coating 4 is made of a Cheng Weihua ZS-611 anti-icing coating, the thickness of the anti-icing coating is 0.1mm, and the anti-icing coating 4 can prevent the wire ice coating from being combined with the semi-cylindrical cavity in the low-temperature icing process to influence the subsequent experiment.
The backup plates 5 of the locking device are arranged at two ends of the horizontal bearing platform 7, and through holes for the transmission line 1 to pass through are reserved on the backup plates.
The rubber sealing gasket 2 and the hexagonal nut 3 are sequentially arranged on the outer side of the backup plate 5 of the locking device, and the locking sleeve 8 is arranged in a hole of the hexagonal nut 3.
The two ends of the power transmission line 1 sequentially pass through a locking device backup plate 5, a rubber sealing gasket 2 and a locking sleeve 8.
The locking nails 9 radially penetrate the locking sleeve 8 to fix the power transmission line 1 from both sides, so that the power transmission line 1 maintains a straight line state when the ice coated wire is prepared.
The method for preparing the semi-cylindrical ice-coated power transmission line sample comprises the following steps:
the two ends of the power transmission line 1 sequentially penetrate through the locking device backup plate 5, the rubber sealing gasket 2 and the locking sleeve 8, the power transmission line 1 is straightened, the locking device backup plate 5, the rubber sealing gasket 2 and the hexagonal nut 3 are tightly attached together, meanwhile, the locking device backup plate 5 is tightly attached to the two ends of the horizontal bearing platform 7, then the locking nails 9 radially penetrate through the locking sleeve 8, the power transmission line 1 is fixed from two sides to enable the power transmission line 1 to keep a straight line state, water is injected into a semi-cylindrical cavity of the horizontal bearing platform 7, ice coating 6 is prepared by freezing, and finally the locking device backup plate 5 is detached, so that the semi-cylindrical ice coating power transmission line sample is obtained.
A second part: test device for normal bonding strength of icing and wire interface
Referring to fig. 5 and 6, the device for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line according to the invention comprises: the semi-cylindrical ice coating housing mold 10, the power line holding mold 20 and the pre-tightening bolts 30.
The semi-cylindrical ice coating accommodating mold 10 is composed of an upper clamping handle 101 and a semi-cylindrical cavity 102, which are of a unitary structure, the upper clamping handle 101 is used for fixing the semi-cylindrical ice coating accommodating mold 10 to a stretching machine (i.e., for upper side clamping loading in experiment), and the semi-cylindrical cavity 102 is used for accommodating the semi-cylindrical ice coating 6. The semi-cylindrical cavity 102 is of a semi-closed structure, a gap exposing the power transmission line 1 is reserved along the axis, and the width of the gap is not smaller than the diameter of the power transmission line 1. The semi-cylindrical ice-coating accommodating mold 10 is made of stainless steel, the length of the upper clamping handle 101 is not less than 80mm, the radius of the cross section of the semi-cylindrical cavity 102 is not less than 60mm, and the length of the cavity is not less than 200mm.
The power line holding force die 20 is composed of a lower grip handle 201 and a support arm 202, both of which are an integral structure, the lower grip handle 201 is for fixing the power line holding force die 20 to the stretcher (i.e., for the lower side grip loading in experiments), and the support arm 202 is for supporting the power line 1. The upper end of the supporting arm 202 is formed with a holding ring 203, the inner diameter of the holding ring 203 is matched with the outer diameter of the power transmission line 1, and the holding ring 203 can be sleeved on the power transmission line 1 for fixing the power transmission lines 1 with different thicknesses. The power transmission line holding force die 20 is made of stainless steel, and the length of the lower clamping handle 201 is not less than 80mm.
The pre-tightening bolt 30 is arranged on the outer side of the holding ring 203 and can be sleeved on the power transmission line 1, and is used for fixing the power transmission line 1 in the holding ring 203 so as not to bend during testing the power transmission line 1 and lose the accuracy of the test.
Method of using a test device:
the semi-cylindrical ice coating 6 is loaded into the semi-cylindrical cavity 102 of the semi-cylindrical ice coating accommodating mold 10, both ends of the power transmission line 1 are passed through the holding ring 203 of the power transmission line holding mold 20, and the power transmission line 1 is fixed in the holding ring 203 by the pre-tightening bolts 30.
Third section: method for testing normal bonding strength of ice coating and wire interface
Loading the semi-cylindrical ice-coated power transmission line sample prepared in the first part into the testing device introduced in the second part, then installing the device with the semi-cylindrical ice-coated power transmission line sample on a stretcher, fixing the upper clamping handle 101 of the semi-cylindrical ice-coated accommodating mould 10 by using the upper anti-slip chuck of the stretcher, fixing the lower clamping handle 201 of the power transmission line holding force mould 20 by using the lower anti-slip chuck of the stretcher, performing a stretching experiment by taking the end of the upper clamping handle 101 as the upper clamping end, adjusting the stretching rate according to the required working condition until the ice coating 6 is completely separated from the power transmission line 1, finishing loading, and finally calculating the normal bonding strength sigma of the interface between the ice coating and the power transmission line according to the following formula b ：
Wherein F is b For the load obtained by the stretcher test, D is the diameter of the transmission line, and L is the length of ice coating on the transmission line.
The testing method comprises the following steps:
(1) The thickness of the ice coating can be tested in a range smaller than that of the semi-cylindrical ice coating accommodating mould;
(2) The icing bonding strength of the power transmission line with various diameters can be tested in the range of being smaller than the diameter of the force holding ring.
Therefore, the testing method is simple and easy to operate, can test the normal bonding strength of the wire interface of the ice coating and the cylindrical surface, and widens the testing range of the bonding strength of the ice coating and the wire.
It should be noted that, the above embodiments are not intended to limit the present invention in any way, and all the technical solutions obtained by adopting equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (1)
1. The method for testing the normal bonding strength of the ice coating and the wire interface of the overhead transmission line is characterized by comprising the following steps:
step1: preparing a semi-cylindrical ice-coated power transmission line sample by using a preparation device of the semi-cylindrical ice-coated power transmission line sample;
step2: loading the semi-cylindrical icing power transmission line sample into a device for testing the normal bonding strength of the icing and wire interface of the overhead power transmission line;
step3: mounting a device with a semi-cylindrical ice-coated power transmission line sample on a stretcher, and performing a stretching experiment by taking the end of the upper clamping handle (101) as the upper clamping end until the ice coating (6) is completely separated from the power transmission line (1), and finishing loading;
step4: calculating normal bonding strength sigma of the icing and the wire interface according to the following formula b ：
Wherein F is b The load obtained by testing the stretcher is D the diameter of the power transmission line, and L the length of ice coating on the power transmission line;
wherein, preparation facilities of semi-cylindrical icing power transmission line sample includes: a horizontal bearing platform (7), a locking device backup plate (5), a rubber sealing gasket (2), a hexagonal nut (3), a locking sleeve (8), locking nails (9) and a power transmission line (1), wherein,
the horizontal bearing platform (7) is provided with a semi-cylindrical cavity, and the wall of the semi-cylindrical cavity is coated with an anti-icing coating (4);
the backup plates (5) of the locking device are arranged at two ends of the horizontal bearing platform (7), and through holes for the transmission line (1) to pass through are reserved on the backup plates;
the rubber sealing gasket (2) and the hexagonal nut (3) are sequentially arranged on the outer side of the backup plate (5) of the locking device, and the locking sleeve (8) is arranged in a hole of the hexagonal nut (3);
both ends of the power transmission line (1) sequentially pass through a locking device backup plate (5), a rubber sealing gasket (2) and a locking sleeve (8);
the locking nails (9) radially penetrate through the locking sleeve (8) and fix the power transmission line (1) from two sides, so that the power transmission line (1) is kept in a straight line state when the ice-covered wire is prepared; the horizontal bearing platform (7) is made of stainless steel; the anti-icing coating (4) adopts a Cheng Weihua ZS-611 anti-icing coating with the thickness of 0.1mm.
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| CN107505262B (en) * | 2017-09-30 | 2024-01-12 | 中国工程物理研究院电子工程研究所 | Bonding force testing tool and method for skeleton-free self-adhesive enameled wire |
| CN110779866A (en) * | 2019-11-12 | 2020-02-11 | 黑龙江省水利科学研究院 | Test device and method for measuring bonding force between bolt and ice |
| CN117554284B (en) * | 2024-01-04 | 2024-03-26 | 山东理工大学 | Nanosecond laser micro-texture silicon rubber surface icing adhesive force testing system |
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