CN211570830U - Tungsten needle electrode preparation facilities of small curvature radius in electricity branch test - Google Patents
Tungsten needle electrode preparation facilities of small curvature radius in electricity branch test Download PDFInfo
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- CN211570830U CN211570830U CN201922404383.XU CN201922404383U CN211570830U CN 211570830 U CN211570830 U CN 211570830U CN 201922404383 U CN201922404383 U CN 201922404383U CN 211570830 U CN211570830 U CN 211570830U
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Abstract
A tungsten needle electrode preparation device with small curvature radius in an electric tree branch test relates to an electrode preparation device. Aims to solve the problem of large curvature radius of the needle point of the tungsten needle electrode prepared by an electrochemical corrosion method. The device is composed of a resin cover, an armature, an iron core, a spring, a coil, an electrode steel plate, a resin support piece and a bottom plate. The utility model discloses regard armature, iron core and spring as striking pulling force generating device, increase the tensile cooperation of impact in the tungsten needle corrosion process, the curvature radius of the needle point of the tungsten needle electrode of preparation is little, is no longer than 0.5 mu m, and the needle point form is regular. The utility model is suitable for a tungsten needle electrode of small curvature radius in the preparation electricity branch is experimental.
Description
Technical Field
The utility model relates to an electrode preparation facilities.
Background
The electrical treeing is an electrical crack phenomenon in a cable material, local electric field concentration is usually caused by defects such as impurities and bubbles in the electrical treeing generation, a dendritic discharge damage channel is gradually formed by the concentrated electric field through local micro-breakdown, and the channel finally extends to all paths to be broken down, so that discharge aging is realized. In experimental studies, tungsten needle electrodes with low radii of curvature are typically inserted into an insulated specimen to obtain a very non-uniform electric field, which in turn initiates electrical dendrites. The non-uniform degree of the extremely non-uniform electric field is greatly influenced by the curvature radius of the needle point of the tungsten needle electrode, and the smaller the curvature radius of the needle point is, the more easily the electrical dendrite is induced. Therefore, the point with small curvature radius is obtained, which has great significance for improving the efficiency of the test.
At present, a tungsten needle electrode for an electric tree experiment is prepared by adopting an electrochemical corrosion method, wherein the electrochemical corrosion method is prepared by a preparation device shown in figure 1, wherein in the figure 1, e is an anode, b is a direct-current power supply, and c is a cathode; the positive pole is the tungsten filament of diameter 0.6mm, and the negative pole is the corrosion resistant plate, and the negative pole center is provided with the round hole of diameter 3mm, connects the negative pole of DC power supply with the one end of tungsten filament during preparation, and the corrosion resistant plate connects the positive pole of DC power supply, and the corrosion resistant plate level is arranged in electrolyte, and the tungsten filament is vertical to be suspended in midair and penetrate the other end of tungsten filament in the round hole of corrosion resistant plate, and electrolyte is 2.5 mol/L's NaOH solution. The direct current power supply is utilized to apply 5V electrolytic voltage, after the power is on, the tungsten filament near the round hole of the stainless steel plate is gradually corroded, so that the outer diameter of the tungsten filament near the round hole is gradually reduced, when the electrochemical corrosion is carried out to a certain degree, the tungsten filament at the lower part of the center of the steel plate falls off, and the part which is not separated is the prepared tungsten needle electrode with the needle point.
When the electrochemical corrosion method is used for preparation, the tungsten wire needle point is formed by mainly stretching the tungsten wire at the lower part of the stainless steel plate by virtue of the falling tension force, but the tungsten wire is generally light, the gravity of the tungsten wire is not enough to break the corroded tungsten wire, the tungsten wire at the lower part falls off only when the chemical corrosion is completely finished, and the curvature radius of the prepared needle point is relatively large and exceeds 2 micrometers.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the big problem of the needle point radius of curvature of the tungsten needle electrode of electrochemical corrosion method preparation, provide a tungsten needle electrode preparation facilities of the experimental medium and small radius of curvature of electric branch.
The tungsten needle electrode preparation device with small curvature radius in the electric branch test of the utility model consists of a resin cover, an armature, an iron core, a spring, a coil, an electrode steel plate, a resin support piece and a bottom plate;
the resin cover is a rectangular cylinder, and a check ring is arranged on the inner wall of the upper port of the resin cover;
the armature is an integrally formed E-shaped body and consists of an armature main body, a first armature central pin, a second armature central pin and two armature side pins; one end of each armature side leg is vertically and fixedly connected with two ends of the armature main body, one end of the first armature central leg is vertically arranged in the middle of the armature main body between the two armature side legs, and the heights of the first armature central leg and the two armature side legs are the same; the second armature central pin is vertically arranged on the back side of the first armature central pin on the armature main body, and a second through hole which vertically penetrates through the center of the second armature central pin, the first armature central pin and the armature main body is arranged on the armature; the armature main body, the first armature central leg, the second armature central leg and the two armature side legs are all cuboid; symmetrical thread through holes are formed in the side wall of the central leg of the second armature, and jackscrews are arranged in the thread through holes;
the iron core is an integrally formed E-shaped iron core and comprises an iron core main body, a central leg and two side legs, one end of each of the two side legs is vertically arranged at each of two ends of the iron core main body, one end of the central leg is vertically arranged in the middle of the iron core main body between the two side legs, and the two side legs and the central leg are the same in height; the iron core is provided with a vertical first through hole which penetrates through the center of the central pin and the iron core main body; the iron core main body, the central leg and the two side legs are all cuboid;
the electrode steel plate is a circular plate, and a through hole is formed in the center of the electrode steel plate;
a through hole is formed in the center of the bottom plate, a circular tube is arranged at the through hole on the lower surface of the bottom plate, the axis of the circular tube is overlapped with the axis of the through hole on the bottom plate, the inner diameter of the circular tube is smaller than that of the through hole in the center of the bottom plate, symmetrical threaded holes are formed in the side wall of the circular tube, and jackscrews are arranged in the threaded holes; the bottom plate is an insulating plate;
the electrode steel plate is arranged above the bottom plate, and a plurality of resin supporting pieces are arranged between the outer edge of the electrode steel plate and the bottom plate; the resin cover is arranged on the upper surface of the electrode steel plate; the armature and the iron core are arranged in the resin cover, the free end of the side leg and the free end of the armature side leg are oppositely arranged, and the distance between the free end of the side leg and the free end of the armature side leg is 2-4 cm;
a certain gap is formed between the lower surface of the iron core and the upper surface of the electrode steel plate; the end faces of the central pin and the central pin of the first armature are oppositely arranged, and the central line of the first through hole, the central line of the second through hole, the central line of the through hole in the center of the electrode steel plate, the central line of the through hole in the center of the bottom plate and the central line of the circular tube are all positioned on the same straight line; all side walls of the armature are in clearance fit with the inner wall of the resin cover; all side walls of the iron core are tightly attached to the inner wall of the resin cover and connected through screws; the two springs are respectively arranged at two sides of the central pin of the first armature, the springs are compression springs, and two ends of the springs are respectively fixedly connected with the armature and the iron core; the coil is wound on the central leg.
The method for preparing the tungsten needle electrode by using the tungsten needle electrode preparation device with the small curvature radius in the electrical branch test is carried out according to the following steps:
the method comprises the following steps: turning on a coil power supply to apply voltage to the coil to enable the armature and the iron core to be in contact; then taking a tungsten filament, penetrating the lower end of the tungsten filament through a second through hole of the armature main body, and leading out the tungsten filament from a circular tube on the lower surface of the bottom plate; screwing the jackscrew on the circular tube, straightening the tungsten wire and simultaneously screwing the jackscrew on the side wall of the central pin of the second armature;
step two: connecting the upper end of the tungsten filament with the anode of an electrolytic power supply through a lead, and connecting the electrode steel plate with the cathode of the electrolytic power supply through a lead; connecting one end of the coil with the anode of a coil power supply, and connecting the other end of the coil with the cathode of the coil power supply;
step three: placing the preparation device in a container, and adding electrolyte into the container until the liquid level is between the lower surface of the iron core and the upper surface of the electrode steel plate; the electrolyte is NaOH solution;
step four: starting an electrolysis power supply, gradually increasing the voltage at the increasing rate of the voltage of 0.5V/s, maintaining the voltage unchanged when the output current of the electrolysis power supply reaches 2A, detecting the output current of the electrolysis power supply, adjusting the voltage of the electrolysis power supply until the output current of the electrolysis power supply reaches 0.5A when the output current of the electrolysis power supply reaches 1A, then maintaining the voltage unchanged and monitoring the output current of the electrolysis power supply, and closing a coil power supply and the electrolysis power supply when the output current of the electrolysis power supply is reduced to 0.2A to obtain the tungsten needle electrode.
And in the fourth step, when the output current of the electrolytic power supply reaches 2A, the chemical corrosion process starts, when the output current of the electrolytic power supply is reduced to 0.2A, the reaction is about to end, at the moment, the coil power supply and the electrolytic power supply are closed, the armature iron and the iron core are demagnetized instantaneously and separated from each other, the compressed spring is released and springs the armature iron open during separation, the armature iron stretches the tungsten needle instantaneously, the tungsten needle is pulled off from the corroded position, and a needle point with small area ratio radius is formed.
When the tungsten needle electrode prepared by the electrochemical corrosion method is used, the current is 5A, the tungsten needle electrode has higher corrosion speed under high current, and after a thin neck is formed on the tungsten needle, the thin neck is quickly corroded, so that a needle point with small curvature radius cannot be formed. The utility model discloses the electric current only is 2A during chemical attack, and the electric current is less, can form more even abundant thin neck structure of corroding behind the thin neck, can form thinner thin neck, and then forms more slender needle structure, and then forms the needle point that curvature radius is littleer.
The utility model discloses regard armature, iron core and spring as striking pulling force generating device, increase the tensile cooperation of impact in the tungsten needle corrosion process, the curvature radius of the needle point of the tungsten needle electrode of preparation is little, is no longer than 0.5 mu m, and the needle point form is regular.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for preparing a tungsten needle electrode by an electrochemical etching method;
FIG. 2 is a schematic structural view of a tungsten needle electrode preparation apparatus having a small radius of curvature in an electrical dendrite test in example 1; a is a tungsten filament;
fig. 3 is a schematic structural view of the armature 2 in embodiment 1;
FIG. 4 is a cross-sectional view of FIG. 3;
fig. 5 is a schematic structural view of the iron core 3 in embodiment 1;
fig. 6 is a cross-sectional view of fig. 5.
The specific implementation mode is as follows:
the technical scheme of the utility model is not limited to the specific implementation modes listed below, and also comprises any reasonable combination between the specific implementation modes.
The first embodiment is as follows: the tungsten needle electrode preparation device with small curvature radius in the electrical dendrite test of the embodiment is composed of a resin cover 1, an armature 2, an iron core 3, a spring 4, a coil 5, an electrode steel plate 6, a resin support piece 7 and a bottom plate 8;
the resin cover 1 is a rectangular cylinder, and a check ring 11 is arranged on the inner wall of the upper port of the resin cover 1;
the armature 2 is an integrally formed E-shaped body, and the armature 2 consists of an armature main body 25, a first armature central leg 22, a second armature central leg 23 and two armature side legs 21; one end of each of the two armature side legs 21 is vertically and fixedly connected with two ends of the armature main body 25, one end of the first armature central leg 22 is vertically arranged in the middle of the armature main body 25 between the two armature side legs 21, and the heights of the first armature central leg 22 and the two armature side legs 21 are the same; the second armature central leg 23 is vertically arranged on the back side of the first armature central leg 22 on the armature main body 25, and the armature 2 is provided with a second through hole 24 which vertically penetrates through the center of the second armature central leg 23, the first armature central leg 22 and the armature main body 25; the armature main body 25, the first armature central leg 22, the second armature central leg 23 and the two armature side legs 21 are all cuboid; symmetrical thread through holes are formed in the side wall of the second armature central leg 23, and jackscrews are arranged in the thread through holes;
the iron core 3 is an integrally formed E-shaped iron core, the iron core 3 is composed of an iron core main body 34, a central leg 32 and two legs 31, one end of each of the two legs 31 is vertically arranged at each of two ends of the iron core main body 34, one end of the central leg 32 is vertically arranged in the middle of the iron core main body 34 between the two legs 31, and the two legs 31 and the central leg 32 are the same in height; the iron core 3 is provided with a vertical first through hole 33 which penetrates through the center of the central pin 32 and the iron core main body 34; the iron core main body 34, the central leg 32 and the two side legs 31 are all cuboid;
the electrode steel plate 6 is a circular plate, and a through hole is formed in the center of the electrode steel plate 6;
a through hole is formed in the center of the bottom plate 8, a circular tube 82 is arranged at the through hole on the lower surface of the bottom plate 8, the axis of the circular tube 82 is overlapped with the axis of the through hole on the bottom plate 8, the inner diameter of the circular tube 82 is smaller than that of the through hole in the center of the bottom plate 8, symmetrical threaded holes are formed in the side wall of the circular tube 82, and jackscrews are arranged in the threaded holes; the bottom plate 8 is an insulating plate;
the electrode steel plate 6 is arranged above the bottom plate 8, and a plurality of resin supporting pieces 7 are arranged between the outer edge of the electrode steel plate 6 and the bottom plate 8; the resin cover 1 is arranged on the upper surface of the electrode steel plate 6; the armature 2 and the iron core 3 are arranged in the resin cover 1, the free end of the side leg 31 and the free end of the armature side leg 21 are oppositely arranged, and the distance between the free ends is 2-4 cm;
a certain gap is formed between the lower surface of the iron core 3 and the upper surface of the electrode steel plate 6; the end faces of the first armature central pin 22 and the central pin 32 are oppositely arranged, and the central line of the first through hole 33, the central line of the second through hole 24, the central line of the through hole in the center of the electrode steel plate 6, the central line of the through hole in the center of the bottom plate 8 and the central line of the circular tube 82 are all positioned on the same straight line; all side walls of the armature iron 2 are in clearance fit with the inner wall of the resin cover 1; all side walls of the iron core 3 are tightly attached to the inner wall of the resin cover 1 and are connected through screws; the two springs 4 are respectively arranged at two sides of the first armature central pin 22, the springs 4 are compression springs, and two ends of the springs are respectively fixedly connected with the armature 2 and the iron core 3; the coil 5 is wound on the central leg 32.
According to the embodiment, the armature 2, the iron core 3 and the spring 4 are used as an impact tension generating device, the cooperation of the impact tension is increased in the tungsten needle corrosion process, the curvature radius of the needle point of the prepared tungsten needle electrode is small and is not more than 0.5 mu m, and the needle point is regular in shape.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the edge of the lower surface of the bottom plate 8 is evenly provided with a plurality of bottom plate support legs 81, and the upper ends of the bottom plate support legs 81 are connected with the bottom plate 8 through screws. Other steps and parameters are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: both ends of the resin support 7 are respectively connected with the electrode steel plate 6 and the bottom plate 8 through screws. Other steps and parameters are the same as in the first embodiment.
The fourth concrete implementation mode: the third difference between the present embodiment and the specific embodiment is that: the lower end face of the resin cover 1 is connected with the electrode steel plate 6 through screws. Other steps and parameters are the same as those in the third embodiment.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the clearance that the lower surface of iron core 3 and 6 upper surfaces of electrode steel plate set up is 1 ~ 2 cm. Other steps and parameters are the same as in one of the first to fourth embodiments.
The sixth specific implementation mode: the method for preparing the tungsten needle electrode by using the tungsten needle electrode preparation device with the small curvature radius in the electrical branch test is carried out according to the following steps:
the method comprises the following steps: turning on a coil power supply to apply a voltage to the coil 5 to make the armature 2 and the iron core 3 contact; then taking a tungsten filament, penetrating the lower end of the tungsten filament through the second through hole 24 of the armature main body 25, and leading out the tungsten filament from the circular tube 82 on the lower surface of the bottom plate 8; screwing the jackscrew on the circular tube 82, straightening the tungsten wire and simultaneously screwing the jackscrew on the side wall of the second armature central pin 23;
step two: the upper end of the tungsten filament is connected with the anode of an electrolytic power supply through a lead, and the electrode steel plate 6 is connected with the cathode of the electrolytic power supply through a lead; connecting one end of the coil 5 with the positive electrode of a coil power supply, and connecting the other end of the coil 5 with the negative electrode of the coil power supply;
step three: placing the preparation device in a container, and adding electrolyte into the container until the liquid level is between the lower surface of the iron core 3 and the upper surface of the electrode steel plate 6; the electrolyte is NaOH solution;
step four: starting an electrolysis power supply, gradually increasing the voltage at the increasing rate of the voltage of 0.5V/s, maintaining the voltage unchanged when the output current of the electrolysis power supply reaches 2A, detecting the output current of the electrolysis power supply, adjusting the voltage of the electrolysis power supply until the output current of the electrolysis power supply reaches 0.5A when the output current of the electrolysis power supply reaches 1A, then maintaining the voltage unchanged and monitoring the output current of the electrolysis power supply, and closing a coil power supply and the electrolysis power supply when the output current of the electrolysis power supply is reduced to 0.2A to obtain the tungsten needle electrode.
According to the embodiment, the armature 2, the iron core 3 and the spring 4 are used as an impact tension generating device, the cooperation of the impact tension is increased in the tungsten needle corrosion process, the curvature radius of the needle point of the prepared tungsten needle electrode is small and is not more than 0.5 mu m, and the needle point is regular in shape.
The seventh embodiment: the sixth embodiment is different from the sixth embodiment in that: and step two, the electrolysis power supply and the coil power supply are both direct current power supplies. The other steps and parameters are the same as in embodiment six.
The specific implementation mode is eight: the sixth or seventh embodiment is different from the sixth or seventh embodiment in that: and step three, the electrolyte is 2.5mol/L NaOH solution. The other steps and parameters are the same as in the sixth or seventh embodiment.
The following examples were used to demonstrate the beneficial effects of this example:
example 1: the tungsten needle electrode preparation device with small curvature radius in the electrical dendrite test of the embodiment is composed of a resin cover 1, an armature 2, an iron core 3, a spring 4, a coil 5, an electrode steel plate 6, a resin support piece 7 and a bottom plate 8;
the resin cover 1 is a rectangular cylinder, and a check ring 11 is arranged on the inner wall of the upper port of the resin cover 1;
the armature 2 is an integrally formed E-shaped body, and the armature 2 consists of an armature main body 25, a first armature central leg 22, a second armature central leg 23 and two armature side legs 21; one end of each of the two armature side legs 21 is vertically and fixedly connected with two ends of the armature main body 25, one end of the first armature central leg 22 is vertically arranged in the middle of the armature main body 25 between the two armature side legs 21, and the heights of the first armature central leg 22 and the two armature side legs 21 are the same; the second armature central leg 23 is vertically arranged on the back side of the first armature central leg 22 on the armature main body 25, and the armature 2 is provided with a second through hole 24 which vertically penetrates through the center of the second armature central leg 23, the first armature central leg 22 and the armature main body 25; the armature main body 25, the first armature central leg 22, the second armature central leg 23 and the two armature side legs 21 are all cuboid; symmetrical thread through holes are formed in the side wall of the second armature central leg 23, and jackscrews are arranged in the thread through holes;
the iron core 3 is an integrally formed E-shaped iron core, the iron core 3 is composed of an iron core main body 34, a central leg 32 and two legs 31, one end of each of the two legs 31 is vertically arranged at each of two ends of the iron core main body 34, one end of the central leg 32 is vertically arranged in the middle of the iron core main body 34 between the two legs 31, and the two legs 31 and the central leg 32 are the same in height; the iron core 3 is provided with a vertical first through hole 33 which penetrates through the center of the central pin 32 and the iron core main body 34; the iron core main body 34, the central leg 32 and the two side legs 31 are all cuboid;
the electrode steel plate 6 is a circular plate, and a through hole is formed in the center of the electrode steel plate 6;
a through hole is formed in the center of the bottom plate 8, a circular tube 82 is arranged at the through hole on the lower surface of the bottom plate 8, the axis of the circular tube 82 is overlapped with the axis of the through hole on the bottom plate 8, the inner diameter of the circular tube 82 is smaller than that of the through hole in the center of the bottom plate 8, symmetrical threaded holes are formed in the side wall of the circular tube 82, and jackscrews are arranged in the threaded holes;
the bottom plate 8 is a PVC plate;
the electrode steel plate 6 is arranged above the bottom plate 8, and 4 resin supporting pieces 7 are arranged between the outer edge of the electrode steel plate 6 and the bottom plate 8; the resin cover 1 is arranged on the upper surface of the electrode steel plate 6; the armature 2 and the iron core 3 are arranged in the resin cover 1, the free end of the side leg 31 and the free end of the armature side leg 21 are oppositely arranged, and the distance is 3 cm;
a certain gap is formed between the lower surface of the iron core 3 and the upper surface of the electrode steel plate 6; the end faces of the first armature central pin 22 and the central pin 32 are oppositely arranged, and the central line of the first through hole 33, the central line of the second through hole 24, the central line of the through hole in the center of the electrode steel plate 6, the central line of the through hole in the center of the bottom plate 8 and the central line of the circular tube 82 are all positioned on the same straight line; all side walls of the armature iron 2 are in clearance fit with the inner wall of the resin cover 1; all side walls of the iron core 3 are tightly attached to the inner wall of the resin cover 1 and are connected through screws; the two springs 4 are respectively arranged at two sides of the first armature central pin 22, the springs 4 are compression springs, and two ends of the springs are respectively fixedly connected with the armature 2 and the iron core 3; the coil 5 is wound on the central leg 32;
the edge of the lower surface of the bottom plate 8 is uniformly provided with 4 bottom plate support legs 81, and the upper ends of the bottom plate support legs 81 are connected with the bottom plate 8 through screws;
two ends of the resin support member 7 are respectively connected with the electrode steel plate 6 and the bottom plate 8 through screws;
the lower end face of the resin cover 1 is connected with the electrode steel plate 6 through a screw;
the gap between the lower surface of the iron core 3 and the upper surface of the electrode steel plate 6 is 2 cm;
the method for preparing the tungsten needle electrode by using the tungsten needle electrode preparation device with the small curvature radius in the electrical branch test is carried out according to the following steps:
the method comprises the following steps: turning on a coil power supply to apply a voltage to the coil 5 to make the armature 2 and the iron core 3 contact; then taking a tungsten filament, penetrating the lower end of the tungsten filament through the second through hole 24 of the armature main body 25, and leading out the tungsten filament from the circular tube 82 on the lower surface of the bottom plate 8; screwing the jackscrew on the circular tube 82, straightening the tungsten wire and simultaneously screwing the jackscrew on the side wall of the second armature central pin 23;
step two: the upper end of the tungsten filament is connected with the anode of an electrolytic power supply through a lead, and the electrode steel plate 6 is connected with the cathode of the electrolytic power supply through a lead; connecting one end of the coil 5 with the positive electrode of a coil power supply, and connecting the other end of the coil 5 with the negative electrode of the coil power supply;
step three: placing the preparation device in a container, and adding electrolyte into the container until the liquid level is between the lower surface of the iron core 3 and the upper surface of the electrode steel plate 6; the electrolyte is 2.5mol/L NaOH solution;
step four: starting an electrolysis power supply, gradually increasing the voltage at the increasing rate of the voltage of 0.5V/s, maintaining the voltage unchanged when the output current of the electrolysis power supply reaches 2A, detecting the output current of the electrolysis power supply, adjusting the voltage of the electrolysis power supply until the output current of the electrolysis power supply reaches 0.5A when the output current of the electrolysis power supply reaches 1A, then maintaining the voltage unchanged and monitoring the output current of the electrolysis power supply, and closing a coil power supply and the electrolysis power supply when the output current of the electrolysis power supply is reduced to 0.2A to obtain the tungsten needle electrode.
FIG. 2 is a schematic structural view of a tungsten needle electrode preparation apparatus having a small radius of curvature in an electrical dendrite test in example 1; fig. 3 is a schematic structural view of the armature 2 in embodiment 1; FIG. 4 is a cross-sectional view of FIG. 3; fig. 5 is a schematic structural view of the iron core 3 in embodiment 1; fig. 6 is a cross-sectional view of fig. 5.
Claims (5)
1. The utility model provides a tungsten needle electrode preparation facilities of experimental minor curvature radius of electricity branch which characterized in that: the device is composed of a resin cover (1), an armature (2), an iron core (3), a spring (4), a coil (5), an electrode steel plate (6), a resin support piece (7) and a bottom plate (8);
the resin cover (1) is a rectangular cylinder, and a check ring (11) is arranged on the inner wall of the upper port of the resin cover (1);
the armature (2) is an integrally formed E-shaped body, and the armature (2) consists of an armature main body (25), a first armature central leg (22), a second armature central leg (23) and two armature side legs (21); one end of each armature side foot (21) is respectively and vertically fixedly connected with two ends of the armature main body (25), one end of the first armature central foot (22) is vertically arranged in the middle of the armature main body (25) between the two armature side feet (21), and the heights of the first armature central foot (22) and the two armature side feet (21) are the same; the second armature central leg (23) is vertically arranged on the back side of the first armature central leg (22) on the armature main body (25), and the armature (2) is provided with a second through hole (24) which vertically penetrates through the center of the second armature central leg (23), the first armature central leg (22) and the armature main body (25); the armature main body (25), the first armature central leg (22), the second armature central leg (23) and the two armature side legs (21) are all cuboid; symmetrical thread through holes are formed in the side wall of the second armature central pin (23), and jackscrews are arranged in the thread through holes;
the iron core (3) is an integrally formed E-shaped iron core, the iron core (3) is composed of an iron core main body (34), a central leg (32) and two side legs (31), one end of each of the two side legs (31) is vertically arranged at each of two ends of the iron core main body (34), one end of each of the central legs (32) is vertically arranged in the middle of the iron core main body (34) between the two side legs (31), and the two side legs (31) and the central leg (32) are the same in height; the iron core (3) is provided with a vertical first through hole (33) which penetrates through the center of the central pin (32) and the iron core main body (34); the iron core main body (34), the central leg (32) and the two side legs (31) are all cuboid;
the electrode steel plate (6) is a circular plate, and a through hole is formed in the center of the electrode steel plate (6);
a through hole is formed in the center of the bottom plate (8), a round pipe (82) is arranged at the through hole on the lower surface of the bottom plate (8), the axis of the round pipe (82) is overlapped with the axis of the through hole on the bottom plate (8), the inner diameter of the round pipe (82) is smaller than that of the through hole in the center of the bottom plate (8), symmetrical threaded holes are formed in the side wall of the round pipe (82), and jackscrews are arranged in the threaded holes; the bottom plate (8) is an insulating plate;
the electrode steel plate (6) is arranged above the bottom plate (8), and a plurality of resin supporting pieces (7) are arranged between the position, close to the outer edge, of the electrode steel plate (6) and the bottom plate (8); the resin cover (1) is arranged on the upper surface of the electrode steel plate (6); the armature (2) and the iron core (3) are arranged in the resin cover (1), the free end of the side foot (31) and the free end of the armature side foot (21) are oppositely arranged, and the distance between the free end of the side foot and the free end of the armature side foot is 2-4 cm;
a certain gap is formed between the lower surface of the iron core (3) and the upper surface of the electrode steel plate (6); the end faces of the first armature central pin (22) and the central pin (32) are oppositely arranged, and the central line of the first through hole (33), the central line of the second through hole (24), the central line of the through hole in the center of the electrode steel plate (6), the central line of the through hole in the center of the bottom plate (8) and the central line of the circular tube (82) are all positioned on the same straight line; all side walls of the armature iron (2) are in clearance fit with the inner wall of the resin cover (1); all side walls of the iron core (3) are tightly attached to the inner wall of the resin cover (1) and connected through screws; the two springs (4) are respectively arranged at two sides of a first armature central pin (22), the springs (4) are compression springs, and two ends of each spring are respectively fixedly connected with the armature (2) and the iron core (3); the coil (5) is wound around the central leg (32).
2. The device for preparing the tungsten needle electrode with the small curvature radius in the electric branch test according to claim 1, is characterized in that: the edge of the lower surface of the bottom plate (8) is uniformly provided with a plurality of bottom plate supporting legs (81), and the upper ends of the bottom plate supporting legs (81) are connected with the bottom plate (8) through screws.
3. The device for preparing the tungsten needle electrode with the small curvature radius in the electric branch test according to claim 1, is characterized in that: and two ends of the resin support piece (7) are respectively connected with the electrode steel plate (6) and the bottom plate (8) through screws.
4. The device for preparing the tungsten needle electrode with the small curvature radius in the electric branch test according to claim 1, is characterized in that: the lower end face of the resin cover (1) is connected with the electrode steel plate (6) through a screw.
5. The device for preparing the tungsten needle electrode with the small curvature radius in the electric branch test according to claim 1, is characterized in that: the clearance that the lower surface of iron core (3) and electrode steel sheet (6) upper surface set up is 1 ~ 2 cm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110952130A (en) * | 2019-12-27 | 2020-04-03 | 哈尔滨理工大学 | Device and method for preparing tungsten needle electrode with small curvature radius in electric branch test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110952130A (en) * | 2019-12-27 | 2020-04-03 | 哈尔滨理工大学 | Device and method for preparing tungsten needle electrode with small curvature radius in electric branch test |
| CN110952130B (en) * | 2019-12-27 | 2023-09-15 | 哈尔滨理工大学 | Device and method for preparing tungsten needle electrode with small curvature radius in electric branch test |
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