CN115165734A - Simulation test method and device for adhesion degree of insulating strip interface - Google Patents

Simulation test method and device for adhesion degree of insulating strip interface Download PDF

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Publication number
CN115165734A
CN115165734A CN202210966337.2A CN202210966337A CN115165734A CN 115165734 A CN115165734 A CN 115165734A CN 202210966337 A CN202210966337 A CN 202210966337A CN 115165734 A CN115165734 A CN 115165734A
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test
test piece
insulating
adhesion
spring scale
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冷学冰
孙晓维
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Shandong Qixing Electric Co ltd
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Shandong Qixing Electric Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • G01N19/04Measuring adhesive force between materials, e.g. of sealing tape, of coating

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention relates to a simulation test method and a simulation test device for adhesion degree of an insulating strip interface, and belongs to the technical field of material adhesion force tests. The method comprises the following steps: s1: obtaining an insulating strip of a cable accessory, S2: preparation of cutting of the test piece, S3: tearing the test piece to a test area, S4: fixing of cable accessories, S5: spring scale reading of adhesion, S6: average value of spring scale readings, S7: adhesion of this batch of products. The device comprises a fixed base, a fixed claw, a spring scale and a test piece; measuring the adhesion degree of each test piece on the test piece one by the spring scale, and recording the reading of the corresponding spring scale; the method has the advantages that the spring scale is connected with the insulating tape test strip on the cable insulating tape and pulled, the used pulling force is measured, and whether the interface adhesion degree of the cable insulating tape reaches the standard or not is judged, so that a set of feasible method is provided, the method is simpler and clearer compared with other methods, the principle is easier to understand, the cost is lower, and the method can be popularized on a large scale.

Description

Simulation test method and device for adhesion degree of insulating strip interface
Technical Field
The invention relates to a simulation test method and a simulation test device for adhesion degree of an insulating strip interface, and belongs to the technical field of material adhesion force tests.
Background
The insulating strip in the power cable accessory is widely applied, has the characteristics of strong manufacturing capacity, high waterproof sealing degree, high product insulating property, strong construction randomness and the like, and is widely applied to the aspects of power construction, fault rush repair and the like. However, the quality of the insulating tape has a great influence on the insulating performance and the waterproof performance of the insulating tape, for example, the cable intermediate joint has the problem of insufficient interfacial adhesion of the insulating tape in practical application, which seriously affects the insulating capability of the insulating tape and is easy to cause cable joint failure, so the method for determining the interfacial adhesion of the insulating tape is very important.
Chinese patent publication No. CN215866324U describes a high-voltage wire harness PVC tape peel strength test apparatus, which discloses a PVC tape viscosity test, but the present market has few studies on the simulation test method of the interface adhesion degree of the insulating tape, and a very reliable and uniform detection method is difficult to occur. On the other hand, machines used in various methods in the market are expensive, the operation is complex, and large-scale popularization is difficult.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a simulation test method and a test device for the adhesion degree of the interface of the insulating strip, which are simpler and clearer, have more understandable principles and lower cost and can be popularized in a large scale.
The invention relates to a simulation test method for adhesion degree of an insulating strip interface, which comprises the following steps:
s1: obtaining an insulating strip of the cable accessory: selecting an insulation strip product applied to cable accessories in the current market, and obtaining a certain number of insulation strips as test pieces for testing in a random selection mode;
s2: preparation of test piece cutting: cutting a section of 300mm single-core high-voltage cable to strip an insulating shielding layer to serve as a test piece foundation bed, lapping and wrapping a selected insulating strip material to the test piece foundation bed after stretching for 200%, wherein the lapping thickness is 5mm, standing at normal temperature for 24 hours, and then cutting off 4 dividing sheets along the circumferential direction to enable the remaining insulating strip to form 4 uniformly-distributed and independent test pieces which are named as a test piece A, a test piece B, a test piece C and a test piece D in sequence;
s3: the test strip was torn to the test zone: taking the fixed distance in the middle of each test strip as a test area, and tearing the insulating tape at one end of each test strip to the beginning of the test area;
s4: fixing of the cable accessory: fixing the cable accessory on a fixing claw on a special fixing base;
s5: spring balance reading for adhesion: connecting one end of the test piece A with a spring scale, vertically pulling the spring scale upwards, uniformly exerting force until the test piece is completely pulled out of a test area, and reading the reading of the spring scale;
s6: average of spring balance readings: repeating the step S5, respectively measuring the readings of the spring scales of the test piece B, the test piece C and the test piece D, and taking an average value to obtain a final result;
s7: the adhesion of this batch of products: and testing the insulating tapes of a plurality of test pieces, comparing the readings of the spring scales of the test pieces with each other, and taking an average value to reflect the adhesion degree of the insulating tape interface of the batch of products.
Preferably, the cable accessory with the insulating tape mentioned in step S1 is sequentially provided with a cable, an insulating layer, an insulating tape and a cold-shrink silicone rubber tube from inside to outside, and the insulating tape is divided into a test piece and a dividing piece by cutting in step S2.
Preferably, in the step S2, the number of the divided pieces cut in the circumferential direction and the number of the remaining test pieces are selected according to actual needs.
Preferably, in step S3, the test area is selected such that the whole test strip is located at the middle third.
The method has the beneficial effects that: the invention utilizes the spring scale to connect and drag with the insulating tape test strip on the cable insulating tape, measures the used pulling force, and judges whether the interface adhesion degree of the cable insulating tape reaches the standard or not, thereby providing a set of feasible methods.
The invention relates to a test device of a simulation test method for the adhesion degree of an insulating strip interface, which comprises the following parts:
the fixed base is transversely placed on the ground and provides a supporting function for the fixed claw;
the fixed claws are arranged on the upper surface of the fixed base through the rotating shaft, and the distance between the fixed claws on two sides is adjusted along the rotating shaft, so that the clamping length of a test piece positioned in two ends of the fixed claws is adjusted;
one end of the spring scale is fixed on the test piece, and the other end of the spring scale is vertically pulled upwards, so that the external force is uniformly applied in the pulling process;
the test piece is a test area after cutting the cold-shrink silicone rubber tube and the split piece;
and the spring scale measures the adhesion degree of each test piece on the test piece one by one and records the reading of the corresponding spring scale.
Preferably, baffles are arranged on two sides of the fixed base, and a limit bolt group is arranged between the fixed claw and the baffle; one end of the limiting bolt group is connected with the fixed claw through a pin shaft, the other end of the limiting bolt group is clamped on the baffle through a nut, and a spring is sleeved on the rotating shaft.
Preferably, the peeling speed of the test piece of the spring scale is 0.5-1.5mm/s at a constant speed, and then the peeling tension of the adhesive tape, namely the adhesion degree of the adhesive tape, is conveniently measured by the spring scale.
Preferably, the test area is the middle third part of the test piece after trisection, and the tilted test piece is pulled vertically from the left side of the test area until the test piece is pulled completely out of the right side of the test area.
The device of the invention has the beneficial effects that: by utilizing the test device, the test piece is fixed only by utilizing the fixing base, and the adhesion degree of the insulating tape can be measured by utilizing a common spring scale, so that the whole structure is reasonable in design and simple to operate, the test result meets the method requirement of GB8230-87 '2.4.3', and the test result is basically consistent.
Drawings
FIG. 1 is a flow schematic block diagram of the method of the present invention.
Fig. 2 is a schematic view of the structure of the cable accessory.
Fig. 3 is a state diagram after the cable accessory is cut.
FIG. 4 is a diagram showing the test strip being torn to the test zone.
Fig. 5 is a schematic structural diagram of a simulation test of the interface adhesion degree of the cable insulation tape.
In the figure: 1. a fixed base; 2. a fixed jaw; 3. a spring scale; 4. a test piece; 41. a cable core; 42. an insulating layer; 43. a test piece; 44. a cold-shrink silicone rubber tube; 45. cutting into pieces; 46. a test zone.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1:
as shown in fig. 1, the adhesion simulation test method for the interface of the insulating tape according to the present invention comprises the following steps:
s1: obtaining an insulating strip of the cable accessory: selecting an insulation strip product applied to cable accessories in the current market, and obtaining a certain number of insulation strips as test pieces 4 to test in a random selection mode;
s2: preparation of test piece cutting: cutting a section of 300mm single-core high-voltage cable with a stripped insulating shielding layer as a test piece 4 base bed, lapping and wrapping a selected insulating strip material onto the test piece 4 base bed after stretching 200%, wherein the wrapping thickness is 5mm, standing at normal temperature for 24 hours, and then cutting off 4 dividing sheets 45 along the circumferential direction to form 4 uniformly-distributed and independent test pieces 43 of the remaining insulating strip material, wherein the test pieces are named as a test piece A, a test piece B, a test piece C and a test piece D in sequence;
s3: the test piece is torn to the test zone: taking the middle of each test strip as a fixed distance to serve as a test zone 46, and tearing an insulating tape at one end of each test strip to the beginning of the test zone 46;
s4: fixing of the cable accessory: fixing the cable accessory on a fixing claw 2 on a special fixing base 1;
s5: spring scale reading of adhesion: one end of the test piece A is connected with the spring scale 3, the spring scale 3 is pulled vertically upwards, the force is applied as uniformly as possible until the test piece 43 is completely pulled out of the test area, and the reading of the spring scale 3 is read at the moment;
s6: average of spring scale readings: repeating the step S5, respectively measuring the readings of the spring scales 3 of the test piece B, the test piece C and the test piece D, and taking an average value to obtain a final result;
s7: the adhesion degree of this batch of products: and testing the insulating tapes of a plurality of test pieces 4, comparing the readings of the spring scales 3 with each other, and taking an average value to reflect the adhesion degree of the insulating tape material interface of the batch of products.
Preferably, the cable accessory with the insulating tape mentioned in step S1 is provided with a cable, an insulating layer 42, an insulating tape and a cold-shrink silicone rubber tube 44 in sequence from inside to outside, and the insulating tape is cut into a test piece 43 and a dividing piece 45 by step S2.
In step S2, the number of the divided pieces 45 and the number of the remaining test pieces 43 to be cut in the circumferential direction are preferably selected as required.
Preferably, in step S3, the test area selects the middle third of the whole test strip 43.
The process of the present invention is further explained below by way of specific examples.
It should be noted that: firstly, selecting a cable middle joint with the length of 30cm as a test piece 4, cutting the cold-shrinkage silicone rubber tube 44 attached to the surface of the test piece 4, and directly tearing off the insulating tape where the dividing piece 45 is located, wherein the area occupied by the dividing piece 45 is not larger than that occupied by the test piece 43. Four mutually independent and uniformly distributed insulating tape residues are formed after the partition area is torn down, and the insulating tape residues are named as a test piece A, a test piece B, a test piece C and a test piece D.
Each test strip 43 is divided into a test zone, approximately one third of the length of the test strip 43, centered. One end of the test strip 43 is pulled until the test strip 43 is pulled away from the test area.
The middle joint of the test piece 4 is fixed on the base, the spring scale 3 clamps the test piece 43 to vertically pull upwards, the tension is uniform as far as possible until the test area of the test piece 43 is completely pulled open, and the degree of the spring scale 3 is read and recorded at the moment.
The four test pieces 43 are respectively tested, the four data are averaged, and the obtained data can reflect the interface adhesion degree of the cable insulating strip.
It should be noted that: the cold-shrink silicone rubber tube 44 is used for wrapping the outside of the cable to exert a restraining extrusion force on the insulating strip, so as to strengthen the tightness between the insulating strip and the cable.
In summary, the adhesion degree of the insulating tape is reflected by measuring the tensile side used for pulling the insulating tape by pulling the insulating tape. The device is only one spring scale 3, which is convenient and quick.
The method of the invention has the beneficial effects that: the invention utilizes the spring scale 3 to connect and draw the insulating tape test strip on the cable insulating tape, measures the used pulling force, judges whether the interface adhesion degree of the cable insulating tape reaches the standard or not according to the pulling force, provides a set of feasible methods, is simpler and clearer compared with other methods, has more understandable principle and lower cost, and can be popularized in a large scale.
Example 2:
the invention relates to a test device of a simulation test method for the adhesion degree of an insulating strip interface, which comprises the following parts:
as shown in fig. 5, the fixing base 1 is transversely placed on the ground and provides a supporting function for the fixing claw 2;
the fixed claws 2 are arranged on the upper surface of the fixed base 1 through a rotating shaft, and the distance between the fixed claws 2 at two sides is adjusted along the rotating shaft, so that the clamping length of the test piece 4 positioned at two ends of the fixed claws is adjusted;
one end of the spring scale 3 is fixed on the test piece 43, and the other end of the spring scale is vertically pulled upwards, so that the external force is uniformly applied in the pulling process;
the test piece 4 is a test area after the cold-shrink silicone rubber tube 44 and the partition piece 45 are cut;
the spring balance 3 measures the adhesion of each test piece 43 on the test piece 4 one by one and records the reading of the corresponding spring balance 3.
Preferably, baffles are arranged on two sides of the fixed base 1, and a limit bolt group is arranged between the fixed claw 2 and the baffles; one end of the limit bolt set is connected with the fixed claw 2 through a pin shaft, the other end of the limit bolt set is clamped on the baffle through a nut, and a spring is sleeved on the rotating shaft.
Preferably, the peeling speed of the test piece 43 of the spring balance 3 is 0.5-1.5mm/s at a constant speed, and then the peeling tension of the adhesive tape, i.e. the adhesion degree of the adhesive tape, is conveniently measured by the spring balance 3.
As shown in fig. 4, the test zone is the middle third of the trisected test piece 4 and the tilted test piece 43 is pulled vertically from the left side of the test zone until it is completely pulled out of the right side of the test zone.
The device of the invention has the beneficial effects that: by using the test device, the test piece 4 is fixed only by using the fixing base 1, and then the adhesion degree of the insulating tape can be measured by using the common spring scale 3, so that the whole structure is reasonable in design and simple to operate, the test result meets the method requirement of GB8230-87 '2.4.3', and the test result is basically consistent.
It should be noted that: the spring balance 3 tensions the tilted test piece 43, and then displays the reading and continues to increase until the test piece 43 starts to be peeled off, the indication value of the spring balance 3 gradually becomes stable, the stable indication value is the adhesion degree of the test piece, and the adhesion force of the test piece can be calculated according to the following formula:
specimen adhesion force (g/mm) = spring scale reading (g)/specimen width (mm).
The invention can be widely applied to the occasions of material adhesion force test.
The above-mentioned matters not mentioned are common technical means in the art, most typically, the "single chip microcomputer principle and its application" in the textbook published by the university press of qinghua 2012, and thus the above description and the drawings sufficiently show the embodiments of the present invention to enable those skilled in the art to practice them.

Claims (8)

1. A simulation test method for adhesion degree of an insulating strip interface is characterized by comprising the following steps:
s1: obtaining an insulating strip of the cable accessory: selecting an insulation strip product applied to cable accessories in the current market, and obtaining a certain number of insulation strips as test pieces (4) for testing in a random selection mode;
s2: preparation of test piece cutting: cutting a section of 300mm single-core high-voltage cable, stripping an insulating shielding layer, serving as a test piece (4) base bed, lapping and wrapping a selected insulating strip material to the test piece (4) base bed after stretching for 200% in a half lap joint mode, wherein the lapping thickness is 5mm, standing at normal temperature for 24 hours, and then cutting off 4 dividing sheets (45) along the circumferential direction to enable the remaining insulating strip to form 4 evenly-distributed and independent test pieces (43), which are named as a test piece A, a test piece B, a test piece C and a test piece D in sequence;
s3: the test piece is torn to the test zone: taking the middle fixed distance of each test strip as a test zone (46), and tearing the insulating tape at one end of each test strip to the beginning of the test zone (46);
s4: fixing of the cable accessory: fixing the cable accessory on a fixed claw (2) on a special fixed base (1);
s5: spring balance reading for adhesion: one end of the test piece (43) A is connected with the spring scale (3), the spring scale (3) is vertically pulled upwards, force is uniformly applied until the test piece (43) is completely pulled out of the test area (46), and the reading of the spring scale (3) is read;
s6: average of spring scale (3) readings: repeating the step S5, respectively measuring the readings of the spring scale (3) of the test piece (43) B, the test piece (43) C and the test piece (43) D, and taking the average value as the final result;
s7: the adhesion degree of this batch of products: and (3) testing the insulating tapes of a plurality of test pieces (4), comparing the readings of the spring scales (3) with each other, and taking an average value to reflect the adhesion degree of the insulating tape material interface of the batch of products.
2. The method for simulating adhesion at an interface of an insulating tape according to claim 1, wherein the cable accessory with the insulating tape mentioned in step S1 is provided with a cable, an insulating layer (42), an insulating tape and a cold-shrink silicone rubber tube (44) in sequence from inside to outside, and the insulating tape is cut into a test piece (43) and a dividing piece (45) by step S2.
3. The method for testing adhesion at the interface of insulating tape according to claim 1, wherein in step S2, the number of the divided pieces (45) cut in the circumferential direction and the number of the remaining test pieces (43) are selected according to actual needs.
4. The method of claim 1, wherein in step S3, the test area (46) is selected such that the entire test piece (43) is located in the middle third.
5. A test apparatus using the simulation test method for adhesion at the interface of insulating tapes according to any one of claims 1 to 4, comprising:
the fixed base (1) is transversely placed on the ground and provides a supporting function for the fixed claw (2);
the fixed claws (2) are arranged on the upper surface of the fixed base (1) through a rotating shaft, and the distance between the fixed claws (2) on two sides is adjusted along the rotating shaft, so that the clamping length of the test piece (4) positioned in two ends of the fixed claws is adjusted;
one end of the spring scale (3) is fixed on the test piece (43), and the other end of the spring scale is vertically pulled upwards, so that the external force is uniformly applied in the pulling process;
the test piece (4) is a test area after the cold-shrink silicone rubber tube (44) and the cutting piece (45) are cut;
the spring scale (3) measures the adhesion degree of each test piece (43) on the test piece (4) one by one, and records the reading of the corresponding spring scale (3).
6. The simulation test device for the adhesion degree of the interface of the insulating strips as claimed in claim 5, wherein baffles are arranged on two sides of the fixed base (1), and a limit bolt group is arranged between the fixed claw (2) and the baffles; one end of the limiting bolt group is connected with the fixed claw (2) through a pin shaft, the other end of the limiting bolt group is clamped on the baffle through a nut, and a spring is sleeved on the rotating shaft.
7. The simulation test device for adhesion degree of insulating tape interface of claim 5, wherein the peeling speed of the test piece (43) of the spring balance (3) is constant 0.5-1.5mm/s, and then the peeling tension of the adhesive tape, i.e. the adhesion degree of the adhesive tape, is conveniently measured by the spring balance (3).
8. The insulating tape interface adhesion simulation test device of claim 5, wherein the test area is the middle third of the test piece (4) after trisection, and the tilted test piece (43) is pulled vertically from the left side of the test area until the right side of the test area is pulled completely.
CN202210966337.2A 2022-08-12 2022-08-12 Simulation test method and device for adhesion degree of insulating strip interface Pending CN115165734A (en)

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CN202210966337.2A CN115165734A (en) 2022-08-12 2022-08-12 Simulation test method and device for adhesion degree of insulating strip interface

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Application Number Priority Date Filing Date Title
CN202210966337.2A CN115165734A (en) 2022-08-12 2022-08-12 Simulation test method and device for adhesion degree of insulating strip interface

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6066136A (en) * 1983-09-20 1985-04-16 Tatsuta Electric Wire & Cable Co Ltd Peeling-off testing method of semiconductive layer
CN102980000A (en) * 2012-11-30 2013-03-20 大连隆星新材料有限公司 Spring self-locking barrel fixing base
CN104458575A (en) * 2014-12-12 2015-03-25 国家电网公司 Test method of bonding strength of composite insulator
CN113555840A (en) * 2021-07-21 2021-10-26 山东七星电气科技发展有限公司 Manufacturing process of self-melting insulating tape wrapped intermediate joint
CN113588550A (en) * 2021-08-31 2021-11-02 西部超导材料科技股份有限公司 Testing device and testing method for embedding binding force of superconducting wire
CN215866324U (en) * 2021-04-09 2022-02-18 襄阳群龙汽车部件股份有限公司 High-voltage wire harness PVC adhesive tape peeling strength testing equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6066136A (en) * 1983-09-20 1985-04-16 Tatsuta Electric Wire & Cable Co Ltd Peeling-off testing method of semiconductive layer
CN102980000A (en) * 2012-11-30 2013-03-20 大连隆星新材料有限公司 Spring self-locking barrel fixing base
CN104458575A (en) * 2014-12-12 2015-03-25 国家电网公司 Test method of bonding strength of composite insulator
CN215866324U (en) * 2021-04-09 2022-02-18 襄阳群龙汽车部件股份有限公司 High-voltage wire harness PVC adhesive tape peeling strength testing equipment
CN113555840A (en) * 2021-07-21 2021-10-26 山东七星电气科技发展有限公司 Manufacturing process of self-melting insulating tape wrapped intermediate joint
CN113588550A (en) * 2021-08-31 2021-11-02 西部超导材料科技股份有限公司 Testing device and testing method for embedding binding force of superconducting wire

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