Cable insulation and sheath material thermal extension detection device
Technical Field
The invention relates to the field of cables, in particular to a cable insulation and sheath material thermal extension detection device.
Background
Organic peroxide crosslinking, silane warm water crosslinking and electron irradiation crosslinking are the most common crosslinking modes for producing crosslinked cables at present. In the intermediate quality control and finished product quality detection of the production process, the crosslinking degree of insulation is generally measured by the technical parameter of thermal extension, and the qualified standard of thermal extension of the three cables is the same. The thermal extension is a test method for examining the plastic deformation and the permanent deformation of the cable insulation and sheath material under the action of heat and load, and the plastic deformation and the permanent deformation are reflected by the change of the elongation rate of thermal aging for a short time under the conditions of test temperature which is much higher than the applicable temperature and certain load. If the deformation is large under the action of heat and load, the mechanical property can be lost until short circuit is caused, the cable cannot be normally used, and when the thermal extension parameters of the cable insulation and sheath material are detected, usually, after a thermal detector fixes a cable insulation and sheath material sample, the sample is placed in an oven to be heated for a period of time, and then the parameters on the thermal detector are read.
The applicant finds that in the process of reading the parameters, if the oven has no observation window to read the parameters or the observation window is difficult to directly read the parameters, the oven door must be opened to read the parameters on the heat detector in the oven, which not only causes great inconvenience to the test, but also easily causes scalding to the testers due to the high temperature of the oven.
Disclosure of Invention
In view of the above, the present invention is directed to a device for detecting thermal extension of cable insulation and sheath materials, so as to solve the technical problem that in the process of reading parameters in the prior art, if an oven does not have an observation window for reading the parameters or the observation window is difficult to directly read the parameters, a door of the oven must be opened to read the parameters on a thermal detector located in the oven, which not only causes great inconvenience to a test, but also easily causes scalding to a tester due to a high temperature of the oven.
The invention provides a cable insulation and sheath material thermal extension detection device based on the above object, which comprises,
a base;
the upper end surface of the base is vertically provided with a plurality of graduated scales;
the upright posts are in one-to-one correspondence with the graduated scales, are positioned on the side walls of the corresponding graduated scales and are vertically fixed on the base, and heating cavities with upward openings are formed in the upright posts;
the bottom block, the supporting block and the embedded blocks are respectively fixed on the upper end surface of the bottom block and the lower end surface of the supporting block;
a clamping portion connected with the insert for clamping an end of the sample of insulating and sheathing material;
one end of the pointer is fixed on the side wall of the bottom block, a second sliding groove penetrating through the upper end face of the stand column is formed in one side of the heating cavity, after the ends of the insulation and sheath material samples are clamped through the clamping parts respectively, the bottom block moves downwards along the heating cavity through gravity, the pointer moves along the second sliding groove along the bottom block, the part, located outside the heating cavity, of the pointer points to the scales of the graduated scale, and the supporting block is used for sealing the opening of the heating cavity;
a placing part fixed on the bottom block and used for placing weights;
and the heating sheet is fixed on the inner side wall of the heating cavity and is used for heating the insulation and sheath material sample in the heating cavity.
Furthermore, the method also comprises the following steps of,
one end of each support column is fixed on the base, two support columns are arranged, and the graduated scale and the upright column are positioned between the two support columns;
the two ends of the threaded rod are connected with the bearing seat through a bearing, and the bottom of the bearing seat is fixed on the side surface of the support column;
the motor is fixed on the base, and an output shaft of the motor is connected with one end of the threaded rod through the coupler;
the lower part of the supporting leg is in threaded connection with the threaded rod, and the side surface of the supporting leg, which faces the supporting column, is in contact connection with the supporting column;
tensile pole and drag hook, its top that is located the scale, the upper end of landing leg and the tip fixed connection of tensile pole, tensile pole is connected with the drag hook with the stand one-to-one, after insulating and sheath material sample in the heating chamber heating predetermined time, with the drag hook catch the corresponding pull ring of establishing on the supporting shoe, promote insulating and sheath material sample to the outside in heating chamber through the motor.
Further, the heating device comprises an air blowing nozzle arranged at the bottom of the heating cavity, and an air inlet of the air blowing nozzle is connected with an air outlet of the air pump.
Further, the clamping portion includes a clamping portion,
one end of the fixing block is fixed on the embedded block;
the movable block is opposite to one side face of the fixed block, and the bottom end of the movable block is in sliding connection with a stabilizing groove formed in the surface of the embedded block;
and the bolts are respectively connected with the fixed block and the movable block in a sliding manner and are used for driving the movable block to be far away from or close to the fixed block.
Further, including the side piece, the opening part in heating chamber is equipped with a side groove at least, the side of supporting shoe be equipped with the side groove corresponding the side piece the supporting shoe with the opening sealed back in heating chamber, the side piece coincides with the side groove.
Further, the placing part comprises a plurality of placing parts,
one end of the connecting rod is fixed on the side wall of the bottom block, and the upper part of the other end of the connecting rod is provided with a tray for placing weights;
one side of the heating cavity is provided with a first sliding chute which penetrates through the upper end surface of the upright post;
when the bottom block is positioned in the heating cavity, the connecting rod is enabled to move along the first sliding groove, and the tray is positioned outside the upright post.
Furthermore, the outer surface of the upright post is provided with a heat insulation layer.
The invention has the beneficial effects that: according to the cable insulation and sheath material thermal extension detection device, after the end parts of insulation and sheath material samples are clamped through the clamping parts respectively, the bottom block moves downwards along the heating cavity through gravity, the pointer moves along the second sliding groove along the bottom block, when the supporting block seals the opening of the heating cavity, the weight with the corresponding weight is added into the placing part, then heating is carried out through the heating piece, after heating is carried out for a period of time, the part of the pointer located outside the heating cavity points to the scale of the graduated scale, and therefore the numerical value of the graduated scale can be directly read through the pointer, operation of experimenters is facilitated, and meanwhile scalding of the experimenters due to high heating temperature is avoided.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is an enlarged view of the interior of a column in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a side view of a clamping portion in an embodiment of the invention;
FIG. 5 is a top view of a post according to an embodiment of the present invention;
wherein, 1-base, 2-graduated scale, 3-column, 4-heating cavity, 5-heating piece, 6-first runner, 7-connecting rod, 8-tray, 9-blowing nozzle, 10-motor, 11-supporting leg, 12-stretching rod, 13-threaded rod, 14-supporting column, 16-bottom block, 17-draw hook, 18-draw ring, 19-supporting block, 20-side groove, 21-side block, 22-second runner, 23-pointer, 24-movable block, 25-fixed block, 26-bolt, 27-embedded block, 28-stabilizing groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
In view of the above objects, a first aspect of the present invention provides an embodiment of a device for detecting thermal elongation of cable insulation and sheath material, as shown in fig. 1 and 2, comprising,
a base 1;
the upper end face of the base 1 is vertically provided with a plurality of graduated scales 2;
the upright posts 3 are in one-to-one correspondence with the graduated scales 2, are positioned on the side walls of the corresponding graduated scales 2 and are vertically fixed on the base 1, and heating cavities 4 with upward openings are formed in the upright posts 3;
the bottom block 16, the supporting block 19 and the embedded block 27 fixed on the upper end surface of the bottom block 16 and the lower end surface of the supporting block 19 respectively;
a clamping portion connected to the insert 27 for clamping an end of the sample of insulating and sheathing material;
a pointer 23, one end of which is fixed on the side wall of the bottom block 16, one side of the heating chamber 4 is provided with a second sliding chute 22 which penetrates through the upper end surface of the upright post 3, after the ends of the insulation and sheath material samples are respectively clamped by the clamping parts, the bottom block 16 is moved downwards along the heating chamber 4 by gravity, the pointer 23 is simultaneously moved along the second sliding chute 22 along the bottom block 16, the part of the pointer 23 positioned outside the heating chamber 4 points to the scale of the graduated scale 2, and the supporting block 19 is used for closing the opening of the heating chamber 4;
a placing part fixed to the bottom block 16 for placing weights;
and the heating sheet 5 is fixed on the inner side wall of the heating chamber 4 and is used for heating the insulation and sheath material sample in the heating chamber 4.
In the embodiment, after the ends of the insulating and sheath material samples are respectively clamped by the clamping parts, the bottom block 16 moves downwards along the heating cavity 4 by gravity, and the pointer 23 moves along the second chute 22 along the bottom block 16, when the supporting block 19 seals the opening of the heating cavity 4, a weight with a corresponding weight is added in the placing part, then heating is started by the heating sheet 5, after a period of heating, because the part of the pointer 23 positioned outside the heating cavity 4 points to the scale of the graduated scale 2, the numerical value of the graduated scale 2 can be directly read by the pointer 23, thereby not only facilitating the operation of experimenters, but also avoiding the scalding of the experimenters easily caused by higher heating temperature; in addition, by the device, the whole process of thermal extension detection is completed in one device, and the device does not need to be matched with an oven for use, so that the test cost is reduced.
As an implementation mode, as shown in fig. 1, the device further includes two support columns 14, one end of each support column 14 is fixed to the base 1, and the graduated scale 2 and the upright column 3 are located between the two support columns 14; the two ends of the threaded rod 13 are connected with the bearing seat through a bearing, and the bottom of the bearing seat is fixed on the side surface of the support column 14; the motor 10 is fixed on the base 1, and an output shaft of the motor is connected with one end of the threaded rod 13 through a coupler; the lower part of the leg 11 is in threaded connection with the threaded rod 13, and the side surface of the leg 11 facing the support column 14 is in contact connection with the support column 14; stretching rod 12 and drag hook 17, it is located the top of scale 2, the upper end of landing leg 11 and the tip fixed connection of stretching rod 12, stretching rod 12 is connected with the drag hook 17 with stand 3 one-to-one, heats the predetermined time back at heating chamber 4 at insulating and sheath material sample, catches on the corresponding pull ring 18 of establishing on supporting shoe 19 with drag hook 17, promotes insulating and sheath material sample to the outside of heating chamber 4 through motor 10.
Considering that when the numerical value of the graduated scale 2 is read and the next batch of samples needs to be detected, if the temperature of the samples is naturally reduced in the heating chamber 5 directly, the time for the temperature to be reduced to the normal temperature is long, at this time, if the supporting block 19 and the bottom block 16 are taken down by hands, the hands are easily scalded due to the high temperature, therefore, in the embodiment, when the numerical value of the graduated scale 2 is read and the next batch of samples needs to be detected, the drag hook 17 hooks the corresponding pull ring 18, the heating sheet 5 stops heating, then the motor 10 is started to drive the threaded rod 13 to rotate, further drive the supporting leg 11 to move upwards, so as to drive the supporting block 19 to move upwards through the stretching rod 12, when the temperature of the insulating and sheathing materials is reduced to the normal temperature after the insulating and sheathing materials are completely separated from the heating chamber 4, the samples, the supporting block 19 and the bottom block 16 are taken down, this way the temperature of the insulation and jacket material is dropped more quickly, improving the efficiency of the test.
As an embodiment, as shown in fig. 1, the heating chamber comprises an air blowing nozzle 9 disposed at the bottom of the heating chamber 4, an air inlet of the air blowing nozzle 9 is connected to an air outlet of an air pump, so that the temperature in the heating chamber 4 needs to be reduced to normal temperature before the next batch of samples are detected, so that the detection is more accurate, and in order to make the temperature in the heating chamber 4 decrease faster, after the heating sheet 5 stops heating, the air blowing nozzle 9 blows into the heating chamber 4, so that the heat in the heating chamber 4 can be dissipated through the second chute 22 as soon as possible, thereby improving the heat dissipation efficiency.
As an embodiment, as shown in fig. 2, 3 and 4, the clamping portion includes a fixing block 25 having one end fixed to an insert 27; the movable block 24 is opposite to one side surface of the fixed block 25, and the bottom end of the movable block 24 is in sliding connection with a stabilizing groove 28 arranged on the surface of the embedded block 27; bolts 26 slidably coupled to the fixed block 25 and the movable block 24, respectively, are used to drive the movable block 24 away from or toward the fixed block 25.
In this embodiment, the sample of the insulation and sheath material is held by placing the end of the sample between the movable block 24 and the fixed block 25, rotating the bolt 26 to drive the bottom of the movable block 24 to slide in the stabilizing groove 28 toward the fixed block 25, stopping the rotation of the driving bolt 26 after the movable block 24 fixes the end of the sample between the fixed blocks 25, and rotating the driving bolt 26 when the end of the sample needs to be loosened.
As an embodiment, as shown in fig. 2, 3 and 4, the heating chamber 4 comprises a side block 21, at least one side groove 20 is provided at the opening of the heating chamber 4, the side block 21 corresponding to the side groove 20 is provided at the side of the supporting block 19, after the supporting block 19 seals the opening of the heating chamber 4, the side block 21 coincides with the side groove 20, and here, by the coincidence of the side block 21 and the side groove 20, the supporting block 19 does not move further into the heating chamber 4 after the opening of the heating chamber 4 is sealed.
As an embodiment, as shown in fig. 1 and 2, the placing part comprises a connecting rod 7, one end of which is fixed on the side wall of the bottom block 16, and the upper part of the other end of which is provided with a tray 8 for placing weights; a first sliding chute 6 penetrating through the upper end surface of the upright post 3 is arranged on one side of the heating cavity 4; when the bottom block 16 is located in the heating chamber 4, the connecting rod 7 is caused to move along the first chute 6 and the tray 8 is located outside the upright 3.
In this embodiment, when adding the weight, directly can add in the stand 3 outside, it is convenient to add.
As an embodiment, the surface of stand 3 is equipped with the insulating layer, guarantees that the inside temperature in heating chamber 4 can not the loss to the outside of stand 3, avoids the experimenter mistake to touch stand 3 and causes the scald.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.