CN115219345A - Cable insulation thermal extension test device and test method - Google Patents
Cable insulation thermal extension test device and test method Download PDFInfo
- Publication number
- CN115219345A CN115219345A CN202110412949.2A CN202110412949A CN115219345A CN 115219345 A CN115219345 A CN 115219345A CN 202110412949 A CN202110412949 A CN 202110412949A CN 115219345 A CN115219345 A CN 115219345A
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- normally closed
- sample
- dumbbell
- closed pneumatic
- clamp
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
Abstract
The invention provides a cable insulation thermal extension test device and a test method. The device comprises an oven and at least one sample rack arranged in the oven, wherein the sample rack comprises an upper dumbbell sheet sample fixing clamp which is positioned on an upper cross beam of the sample rack and used for fixing a dumbbell sheet sample, a normally closed pneumatic clamp which is movably clamped at the lower end of the dumbbell sheet sample, a load weight which is suspended at the lower end of the normally closed pneumatic clamp, and a measuring scale which is vertically positioned on the sample rack and positioned at the side of the dumbbell sheet sample, wherein the number of the upper dumbbell sheet sample fixing clamp is at least one; the normally closed pneumatic clamp is connected with an air source through an electromagnetic valve, and the air source is controlled by the electromagnetic valve to charge high-pressure air flow into the normally closed pneumatic clamp so that the normally closed pneumatic clamp is separated from the lower end of the dumbbell piece sample. The cable insulation thermal extension test device can pneumatically control the normally closed pneumatic clamp to automatically fall off, replaces the process of manually cutting off dumbbell-shaped samples by using scissors, and avoids accidents such as scalding caused by personnel operating at high temperature.
Description
Technical Field
The invention relates to the field of cable quality detection, in particular to a cable insulation thermal extension test device and a test method.
Background
With the rapid increase of the national industrial level, the demand of domestic electric quantity is increasingly increased, and meanwhile, the power production and transmission face unprecedented tests. The insulation of the wire and cable plays a significant role in the process of safe transmission of electric power. The insulation thermal extension test of the cable is mainly used for detecting whether the crosslinking degree of the cable insulation layer reaches the standard or not, and is an important index for the quality of the cable. The current cable thermal extension test is a conventional test method, and the test method is as follows:
1. numbering dumbbell sheet samples (namely cable samples) after sample preparation, and solving the cross sectional area of the middle part;
2. marking the middle position of the dumbbell sheet with a specified gauge length of 20 mm;
3. hanging the dumbbell pieces into a self-made iron stand according to the serial numbers, and hanging weights with corresponding weights;
4. putting the self-made iron frame into an oven, adjusting the temperature of the oven to 200 ℃, closing the oven door, and adjusting the time gear for 10 minutes;
5. after the oven sounds a whistle to warn, a tester opens the oven, records the original gauge length of the dumbbell sheet at high temperature, cuts off the weight end of the dumbbell sheet, closes the oven door again, and adjusts the gear for 5 minutes;
6. after the oven whistles for the second time to warn, the tester takes out the test iron stand;
7. completely cooling the dumbbell pieces, taking down the dumbbell pieces, and measuring and recording the original gauge length of the dumbbell pieces;
8. and calculating the elongation after fracture and the elongation after cooling according to the recorded data.
Through the process brief description of the traditional detection method, the detection process excessively depends on human participation, and a group of detections can be completed only after one human resource is consumed for about 30 minutes, so that the efficiency is extremely low; the dumbbell sheet is manually sheared under the high temperature condition of 200 ℃, and the risk of being scalded is caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a cable insulation thermal extension test device and a test method.
In order to achieve the above purpose, the invention provides a cable insulation thermal extension test device, which comprises an oven and at least one sample holder arranged in the oven, wherein the sample holder comprises a dumbbell sheet sample upper fixing clamp positioned on an upper beam of the sample holder and used for fixedly positioning a dumbbell sheet sample at the lower end, a normally closed pneumatic clamp movably clamped at the lower end of the dumbbell sheet sample, a load weight suspended at the lower end of the normally closed pneumatic clamp, and a measuring scale vertically positioned on the sample holder and positioned on the side of the dumbbell sheet sample, wherein the number of the dumbbell sheet sample upper fixing clamp is at least one;
the normally closed pneumatic clamp is connected with an air source through an electromagnetic valve, and the air source is controlled by the electromagnetic valve to charge high-pressure air flow into the normally closed pneumatic clamp so that the normally closed pneumatic clamp is separated from the lower end of the dumbbell piece sample.
The cable insulation thermal extension test device can pneumatically control the normally closed pneumatic clamp to automatically fall off, replaces the process of manually cutting off dumbbell-shaped samples by using scissors, and avoids accidents such as scalding caused by personnel operating at high temperature.
The preferable scheme of the cable insulation thermal extension test device is as follows: the normally closed pneumatic clamp comprises a clamp body with an axial blind hole, two clamping blocks, wherein the middle parts of the two clamping blocks are hinged to two sides of the clamp body relatively, the front ends of the two clamping blocks mutually form a clamping pair, and two ends of the elastic pieces are respectively positioned at the rear part of the clamping blocks and the side part of the clamp body; the elastic piece is in a compressed state, so that the two clamping blocks are in a normally closed state;
two sliding blocks are arranged on two sides of the root part of the axial blind hole of the clamp body in a sliding manner, the outer ends of the two sliding blocks are correspondingly abutted against the front parts of the two clamping blocks in the forward direction, the inner ends of the two sliding blocks are opposite in the forward direction and are positioned on two sides of the central axis in the axial blind hole, and the sliding blocks and the clamp body are arranged in a dynamic sealing manner;
the rear end of the clamp body is provided with a hanging ring which is in static sealing fit with the axial blind hole, the hanging ring, the axial blind hole and the two sliding blocks form a sealed air cavity, and the side part of the rear end of the clamp body is provided with an air inlet which can enable the sealed air cavity and an air source to be communicated.
The normally closed pneumatic clamp is simple in structure and small in size, and a conventional high-temperature box can accommodate multiple groups of samples to be tested simultaneously.
The preferable scheme of the cable insulation thermal extension test device is as follows: the air outlet of the electromagnetic valve is communicated with the normally closed pneumatic clamp, the air inlet of the electromagnetic valve is communicated with the inflator pump, and the inlet of the inflator pump is communicated with the air;
the inflator pump is electrically connected with a relay, the relay and the electromagnetic valve are respectively connected with the controller, and the controller controls whether the inflator pump works or not through the relay. The flow and operation of the cable insulation thermal extension test are intelligently controlled through the controller.
The preferable scheme of the cable insulation thermal extension test device is as follows: the controller is also in communication connection with an intelligent terminal. The intelligent terminal can send information to the controller to set test parameters in the cable insulation thermal extension test process so as to correspond to different test objects; and a control instruction can be sent to the controller remotely to control the falling of the normally closed pneumatic clamp.
The preferable scheme of the cable insulation thermal extension test device is as follows: the dumbbell piece sample rack is characterized in that a plurality of dumbbell piece sample upper fixing clamps are arranged on the sample rack, a plurality of normally closed pneumatic clamps are arranged below the sample rack, the sample rack also comprises a main air pipe communicated with the electromagnetic valve, and the main air pipe is communicated with a plurality of air inlets of the pneumatic clamps through an air pipe branching device. The arrangement of the air pipe branching device ensures that the device is connected to the outside of the test bin of the high-temperature box by only one main air pipe, and the change of the existing high-temperature box is small.
The preferable scheme of the cable insulation thermal extension test device is as follows: and a tray is arranged at the bottom of the sample rack and is positioned below the normally closed pneumatic clamp and the load weight. After the weight falls, the weight falls in the tray, so that the weight can be taken out at high temperature conveniently.
The invention also provides a cable insulation thermal extension test method, which comprises the following steps:
s1, recording the original length of a dumbbell sheet, assembling the dumbbell sheet according to the cable insulation thermal extension test device, and putting the dumbbell sheet into a drying oven;
s2, connecting an air source, and adjusting the temperature of the oven to a specified temperature;
s3, closing the oven door, and setting a first heating time length;
s4, measuring the first length of the dumbbell sheet when the first heating duration is over;
s5, the controller controls the normally closed pneumatic clamp to be opened, and the normally closed pneumatic clamp and the load weight fall off;
s6, setting a second heating time length;
s7, when the second heating duration is over, taking out the sample holder, and measuring the second length of the dumbbell sheet after natural cooling;
and S8, respectively comparing the first length of the dumbbell sheet and the second length of the dumbbell sheet with the original length of the dumbbell sheet, and calculating the high-temperature elongation and the elongation after cooling of the high-temperature dumbbell sheet.
The invention has the beneficial effects that: the invention has simple structural design, low system modification cost, simple system control and convenient system integration, can automatically fall off through the remote control of the normally closed pneumatic clamp, replaces the process of manually cutting off the dumbbell-shaped sample by using the scissors, and avoids accidents such as scalding and the like caused by the operation of personnel at high temperature.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is an electrical control schematic diagram of a cable insulation thermal elongation test apparatus;
FIG. 2 is a schematic view of the sample holder assembly;
FIG. 3 is a schematic view of a normally closed pneumatic clamp configuration;
FIG. 4 isbase:Sub>A cross-sectional view taken along A-A of FIG. 3;
fig. 5 is a flow chart of a cable insulation thermal extension test method.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 4, the invention provides a cable insulation thermal extension test device, which includes an oven and at least one sample holder 10 disposed in the oven, where the sample holder 10 includes a dumbbell sheet sample upper fixing clamp 11, a normally closed pneumatic clamp 13, a load weight 14 and a measuring ruler 15, the dumbbell sheet sample upper fixing clamp 11 is positioned on an upper beam of the sample holder 10 and is used for fixing a dumbbell sheet sample 12, the normally closed pneumatic clamp 13 is movably clamped at a lower end of the dumbbell sheet sample 12, the load weight 14 is suspended at a lower end of the normally closed pneumatic clamp 13, the measuring ruler 15 is vertically positioned on the sample holder 10 and is positioned at a side of the dumbbell sheet sample 12, where the number of the dumbbell sheet sample upper fixing clamps 11 is at least one, the normally closed pneumatic clamp 13 is connected with an air source through an electromagnetic valve 20, and the electromagnetic valve 20 controls the normally closed air source to charge a high-pressure air flow into the normally closed pneumatic clamp 13 so that the normally closed pneumatic clamp 13 is separated from the lower end of the dumbbell sheet sample 12.
The bottom of the sample holder 10 is provided with a tray 16, the tray 16 is positioned below the normally closed pneumatic clamp 13 and the load weight 14, the weight of the load weight 14 is determined by the cross-sectional area of the detection part of the dumbbell sheet sample 12, the cross-sectional area is conventional technology and is not described in detail, and the top of the sample holder 10 is provided with a handle 17.
In the present embodiment, the normally closed pneumatic clamp 13 preferably adopts, but is not limited to, the following structure: the normally closed pneumatic clamp 13 comprises a clamp body with an axial blind hole, two clamping blocks 13-1 with middle parts hinged to two sides of the clamp body oppositely and front ends forming a clamping pair mutually, in the embodiment, the middle parts of the clamping blocks 13-1 are hinged to two sides of the clamp body through pin shafts 13-3, and two ends are respectively positioned on elastic pieces 13-4 at the rear part of the clamping blocks 13-1 and the side part of the clamp body; the elastic piece 13-4 is in a compressed state, so that the two clamping blocks 13-1 are in a normally closed state; the two clamping blocks 13-1 are bilaterally symmetrical.
Two sliding blocks 13-2 are arranged on two sides of the root of the axial blind hole of the clamp body in a sliding mode, the outer ends of the two sliding blocks 13-2 are abutted against the front portions of the two clamping blocks 13-1 in the forward direction, the inner ends of the two sliding blocks 13-2 are opposite in the forward direction and located on two sides of the central axis in the axial blind hole, and the sliding blocks 13-2 and the clamp body are arranged in a dynamic sealing mode. In this embodiment, the slider 13-2 preferably but not limited to adopt a fluororubber material as a sealing gasket, is suitable for working in an environment of 200 ℃, and is coated with high-temperature-resistant oil in the movement range of the slider 13-2 to reduce the movement resistance of the slider.
The rear end of the clamp body is provided with a hanging ring 13-7 which is in static sealing fit with the axial blind hole, the hanging ring 13-7, the axial blind hole and the two sliding blocks 13-2 form a sealed air cavity 13-6, and the side part of the rear end of the clamp body is provided with an air inlet 13-5 which can enable the sealed air cavity 13-6 and an air source to be communicated.
In order to improve the detection efficiency, the sample holder 10 may have a plurality of upper dumbbell sample fixing clamps 11, and a plurality of corresponding normally closed pneumatic clamps 13 below the upper dumbbell sample fixing clamps 11, and the sample holder 10 further includes a main air tube 19 communicated with the electromagnetic valve 20, and the main air tube 19 is communicated with the air inlets 13-5 of the plurality of pneumatic clamps 13 through an air tube splitter 18.
When the pressure in the sealed air cavity 13-6 is consistent with the atmospheric pressure, the sliding block 13-2 has no acting force and can not push the pneumatic clamp to open, at the moment, the force arm of the clamping block 13-1 can be opened by manpower to normally close the pneumatic clamp 13, and after the clamping block is released, automatic clamping is realized. When the normally closed pneumatic clamp 13 needs to automatically fall in the oven, air pressure with certain pressure intensity is added through the air inlet 13-5, the slide block 13-2 pushes the clamping block 13-1 to open the clamp under the action of pressure, and the normally closed pneumatic clamp 13 and the load weight 14 are separated from the lower end of the dumbbell sheet sample 12 under the action of gravity and automatically fall.
The device adopts a controllable air source mode to realize the addition of air pressure to the air inlet 13-5, and comprises the following specific steps:
an air outlet of the electromagnetic valve 20 is communicated with the normally closed pneumatic clamp 13, specifically, the air outlet of the electromagnetic valve 20 is communicated with an air inlet 13-5 of the normally closed pneumatic clamp 13, the air inlet of the electromagnetic valve 20 is communicated with the inflator 30, and the inlet of the inflator 30 is communicated with the air; the inflator 30 is electrically connected with a relay 40, the relay 40 and the electromagnetic valve 20 are respectively connected with a controller 50, the controller 50 controls whether the inflator 30 works or not through the relay 40, and the specific control method can be realized by adopting the prior art. The electromagnetic valve 20 in the device adopts a 5-position 2-powered electromagnetic valve, and when the device works normally, high-pressure gas of the inflator pump 30 is communicated with the normally closed pneumatic clamp 13 through a 5-position 2-way valve; after the normally closed pneumatic clamp 13 is opened, the air pump pipeline and the normally closed pneumatic clamp pipeline are respectively switched into the air pipeline, so that the air pressure of the air pump pipeline and the air pressure of the normally closed pneumatic clamp pipeline are the same as the atmospheric pressure. Therefore, under the clamping state of the normally closed pneumatic clamp 13, the normally closed pneumatic clamp 13 and the inflator pump 30 are both connected to the atmosphere, the high pressure in the trachea is avoided for a long time, and the service life of the device is shortened.
In this embodiment, the controller 50 may also be in communication connection with the intelligent terminal 70, and the intelligent terminal 70 sends a control command to the controller to control the normally closed pneumatic clamp 13 to open, so that the switching power supply 60 supplies power to the electrical parts of the apparatus.
The controller 50 controls the relay 40 and the electromagnetic valve 20 to realize high-pressure charging of the normally closed pneumatic clamp 13, the normally closed pneumatic clamp 13 automatically opens, and the normally closed pneumatic clamp 13 and the load weight 14 automatically fall into the tray under the action of gravity; after dropping, the inflator pump 30 is turned off, and the air paths of the electromagnetic valve 20 are switched simultaneously, so that part of the air paths of the normally closed pneumatic clamp 13 and the output air path of the inflator pump 30 are switched to the air, and the stability of the equipment is prevented from being reduced due to the fact that the air pressure of the air paths is too high for a long time. The method and principle of the controller 50 controlling the relay 40 and the solenoid valve 20 are implemented by the prior art, and will not be described in detail here.
In order to further improve the intelligence of the device and reduce the reading subjectivity of testers, distance sensors are arranged at the head end and the tail end of each dumbbell sheet sample 12, the length of each dumbbell sheet sample 12 at different times or states is read by the distance sensors, and each distance sensor is connected with the controller 50.
As shown in fig. 5, the present invention further provides an embodiment of a cable insulation thermal extension test method, which specifically includes the following steps:
s1, recording the original length of a dumbbell sample 12, assembling the cable insulation thermal extension test device, and placing the assembled cable insulation thermal extension test device into an oven.
And S2, connecting an air source, and adjusting the temperature of the oven to a specified temperature, such as 200 ℃.
And S3, closing the oven door, and setting a first heating time period, such as 10 minutes.
And S4, measuring a first length of the dumbbell sheet sample 12 through the measuring scale 15 when the first heating time period is finished.
And S5, the controller 50 controls the normally closed pneumatic clamp 13 to be opened, and the normally closed pneumatic clamp 13 and the load weight 14 fall off.
And S6, setting a second heating time period, such as 5 minutes.
And S7, when the second heating time period is finished, taking out the sample holder 10, and measuring the second length of the dumbbell sheet sample 12 after natural cooling.
And S8, respectively comparing the first length of the dumbbell sheet sample 12, the second length of the dumbbell sheet sample 12 and the original length of the dumbbell sheet sample 12, and calculating the high-temperature elongation and the elongation after cooling of the dumbbell sheet sample 12.
The parameters such as the heating temperature, the first heating time, the second heating time and the like can be written into the chip of the controller 50, or the intelligent terminal 70 can send parameter information to the controller for setting. When the original length of the dumbbell sample 12, the first length of the dumbbell sample 12, and the second length of the dumbbell sample 12 are read by the distance sensors, each distance sensor sends the above three kinds of length information of the dumbbell sample 12 corresponding to the distance sensor to the controller 50, and the controller 50 calculates the high-temperature elongation and the elongation after cooling of each dumbbell sample 12.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The utility model provides a cable insulation thermal extension test device which characterized in that: the dumbbell piece sample fixing device comprises an oven and at least one sample holder (10) arranged in the oven, wherein the sample holder (10) comprises a dumbbell piece sample upper fixing clamp (11) which is positioned on an upper beam of the sample holder (10) and used for fixing a dumbbell piece sample (12), a normally closed pneumatic clamp (13) movably clamped at the lower end of the dumbbell piece sample (12), a load weight (14) hung at the lower end of the normally closed pneumatic clamp (13), and a measuring scale (15) vertically positioned on the sample holder (10) and located on the side of the dumbbell piece sample (12), wherein the number of the dumbbell piece sample upper fixing clamp (11) is at least one;
the normally closed pneumatic clamp (13) is connected with an air source through an electromagnetic valve (20), and the air source is controlled by the electromagnetic valve (20) to fill high-pressure airflow into the normally closed pneumatic clamp (13) so that the normally closed pneumatic clamp (13) is separated from the lower end of the dumbbell piece sample (12).
2. The cable insulation thermal extension test device of claim 1, wherein: the normally closed pneumatic clamp (13) comprises a clamp body with an axial blind hole, two clamping blocks (13-1) with middle parts hinged to two sides of the clamp body relatively and front ends forming a clamping pair mutually, and elastic pieces (13-4) with two ends respectively positioned at the rear part of the clamping blocks (13-1) and the side part of the clamp body; the elastic piece (13-4) is in a compressed state, so that the two clamping blocks (13-1) are in a normally closed state;
two sliding blocks (13-2) are arranged on two sides of the root part of the axial blind hole of the clamp body in a sliding mode, the outer ends of the two sliding blocks (13-2) are abutted against the front parts of the two clamping blocks (13-1) in the forward direction, the inner ends of the two sliding blocks (13-2) are opposite in the forward direction and located on two sides of the central axis in the axial blind hole, and the sliding blocks (13-2) and the clamp body are arranged in a dynamic sealing mode;
the rear end of the clamp body is provided with a hanging ring (13-7) which is in static seal fit with the axial blind hole, the hanging ring (13-7), the axial blind hole and the two sliding blocks (13-2) form a sealed air cavity (13-6), and the side part of the rear end of the clamp body is provided with an air inlet (13-5) which can enable the sealed air cavity (13-6) and an air source to be communicated.
3. The cable insulation thermal extension test device of claim 2, wherein: an air outlet of the electromagnetic valve (20) is communicated with the normally closed pneumatic clamp (13), an air inlet of the electromagnetic valve (20) is communicated with an inflator pump (30), and an inlet of the inflator pump (30) is communicated with air;
the inflator pump (30) is electrically connected with a relay (40), the relay (40) and the electromagnetic valve (20) are respectively connected with the controller (50), and the controller (50) controls whether the inflator pump (30) works or not through the relay (40).
4. A cable insulation thermal elongation test apparatus according to claim 3, wherein: the controller (50) is also in communication connection with an intelligent terminal (70).
5. The cable insulation thermal extension test device of claim 2, wherein: the dumbbell sheet sample fixing device comprises a sample rack (10), wherein a plurality of dumbbell sheet sample upper fixing clamps (11) are arranged on the sample rack (10), a plurality of normally closed pneumatic clamps (13) are correspondingly arranged below the sample rack, the sample rack (10) further comprises a main air pipe (19) communicated with an electromagnetic valve (20), and the main air pipe (19) is communicated with air inlets (13-5) of the pneumatic clamps (13) through an air pipe branching device (18).
6. The cable insulation thermal extension test device of claim 1, wherein: the bottom of the sample holder (10) is provided with a tray (16), and the tray (16) is positioned below the normally closed pneumatic clamp (13) and the load weight (14).
7. The cable insulation thermal elongation testing apparatus according to claim 1, characterized in that: the top of the sample holder (10) is provided with a handle (17).
8. A cable insulation thermal extension test method is characterized in that: the method comprises the following steps:
s1, recording the original length of a dumbbell sheet, assembling the dumbbell sheet according to the cable insulation thermal extension test device of any one of claims 1 to 7, and placing the dumbbell sheet into an oven;
s2, connecting an air source, and adjusting the temperature of the oven to a specified temperature;
s3, closing the oven door and setting a first heating time length;
s4, measuring the first length of the dumbbell sheet when the first heating duration is over;
s5, the controller (50) controls the normally closed pneumatic clamp (13) to be opened, and the normally closed pneumatic clamp (13) and the load weight (14) fall off;
s6, setting a second heating time length;
s7, when the second heating time period is finished, taking out the sample holder (10), and measuring the second length of the dumbbell sheet after natural cooling;
and S8, respectively comparing the first length of the dumbbell sheet and the second length of the dumbbell sheet with the original length of the dumbbell sheet, and calculating the high-temperature elongation and the elongation after cooling of the high-temperature dumbbell sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110412949.2A CN115219345A (en) | 2021-04-16 | 2021-04-16 | Cable insulation thermal extension test device and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110412949.2A CN115219345A (en) | 2021-04-16 | 2021-04-16 | Cable insulation thermal extension test device and test method |
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| CN115219345A true CN115219345A (en) | 2022-10-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115753443A (en) * | 2022-12-05 | 2023-03-07 | 杭州应敏科技有限公司 | Tool for thermal extension test and thermal extension test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115753443A (en) * | 2022-12-05 | 2023-03-07 | 杭州应敏科技有限公司 | Tool for thermal extension test and thermal extension test device |
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