A columnar porcelain insulator with a protective cover

Abstract

The present invention relates to the technical field of insulators, and discloses a post-type porcelain insulator with a protective cover, including a porcelain insulator, on which there is provided: The clamping mechanism includes: The protective shell is of a whistle-shaped structure, with an inlet opening on the left side and a movable hole on the right side. The protective shell is used to protect the connection between the porcelain insulator and the cable. A first clamping seat is fixedly installed on the back surface of the inner wall of the protective shell. One end of a screw rod threadedly penetrates the front surface of the protective shell and extends into the interior of the protective shell. A second clamping seat is fixedly installed on the extending end of the screw rod. By passing one end of the cable through the inlet opening and out of the sleeve, rotating the sleeve in the movable hole, rotating the U-shaped arm against the sleeve, and screwing in the anti-rotation pin to keep the sleeve fixed, tightening the rotary handle, rotating the screw rod and pushing the second clamping seat, pressing the cable against the first clamping seat for stable clamping, adjusting the connection angle of the cable outlet end and eliminating the cumbersome process of replacing the clamping seat, conveniently adjusting different installation methods for the cable, and reducing the work burden.

Description

Technical Field

[0001] The present invention relates to the technical field of insulators, and particularly to a post porcelain insulator with a protective cover. Background Art

[0002] A post porcelain insulator is an insulator in the form of a column made of electrical porcelain and is used to fix a distribution line. Currently, a post porcelain insulator includes a porcelain part, one end of the porcelain part is provided with a groove matching an aluminum conductor steel-reinforced wire, and a bolt is poured at the other end.

[0003] According to Chinese Patent Publication No. CN103390472B, this patent provides a post porcelain insulator, including a porcelain part, a wire pressing plate, a bolt, a first nut matching the bolt, a hollow fixing rod and a connecting piece. Since the first groove and the second groove are the same, the distance from the fixing hole to the center point of the second groove is the same as the distance from the fixing rod to the center point of the first groove, and the center points of the first groove and the second groove are located on the axis of the porcelain part. Therefore, when the bolt with a nut passes through the fixing hole and is screwed onto the fixing rod, one ends of the first groove and the second groove are aligned, one end of the connecting piece is connected to the surface of the upper cap on the other side of the first groove, and the other end of the connecting piece is connected to the surface of the wire pressing plate on the other side of the second groove, so that the other ends of the first groove and the second groove are also aligned. Thus, the aluminum conductor steel-reinforced wire is fixed by the groove formed by the first groove and the second groove. Compared with the existing binding method, the method of fixing the aluminum conductor steel-reinforced wire reduces the wear of the aluminum conductor steel-reinforced wire under the action of micro-vibration, thereby reducing the probability of the aluminum conductor steel-reinforced wire being worn and broken, reducing the power outage failure rate. The method of fixing the aluminum conductor steel-reinforced wire is more reliable than the binding method, and further can prevent the aluminum conductor steel-reinforced wire from falling and avoid endangering personal safety.

[0004] However, according to different erection requirements, the installation methods of porcelain insulators are divided into suspending cables, supporting cables, and connecting aluminum conductor steel-reinforced wires. Each method has different structural requirements for the clamp seat and the connecting fitting, so the corresponding clamp seat fitting needs to be replaced. There are usually several porcelain insulators on each transmission line tower, which then leads to a large amount of replacement work and causes a maintenance burden. Summary of the Invention

[0005] The purpose of the present invention is to provide a post porcelain insulator with a protective cover to achieve the purpose of solving the above problems.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A post porcelain insulator with a protective cover, including a porcelain insulator, and the porcelain insulator is provided with:

[0007] A clamping mechanism, including:

[0008] A protective shell, which is in a whistle shape, and has an inlet on the left side and a movable hole on the right side;

[0009] The first clamping seat is fixedly installed on the back of the inner wall of the protective shell;

[0010] One end of the screw rod threadedly penetrates through the front of the protective shell and extends into the protective shell;

[0011] The second clamping seat is fixedly installed on the extending end of the screw rod, and the bottom is attached to the bottom of the inner wall of the protective shell;

[0012] The rotary handle is fixedly installed on the other end of the screw rod and is located outside the front of the protective shell;

[0013] The caliper is fixedly installed on the top of the inner wall of the protective shell;

[0014] One end of the aluminum conductor steel-reinforced is clamped in the jaws of the caliper, and the other end movably penetrates to the outside of the top of the protective shell;

[0015] An adjusting mechanism is provided on the protective shell, and the adjusting mechanism includes:

[0016] One end of the outer wall front and the outer wall back of the sleeve are respectively hinged to the inner wall front and the inner wall back of the movable hole through the first pin. The sleeve is also slidably connected to the inner wall of the movable hole, and the end far from the first pin extends upward;

[0017] There are six limiting holes, and every three are respectively opened on the front and back of the outer wall of the protective shell in sequence;

[0018] The two ear ends of the U-shaped arm are respectively hinged to the right side of the front and the right side of the back of the outer wall of the protective shell through the second pin;

[0019] One side top of the U-shaped arm far from the two ear ends is attached to the right side of the outer wall of the sleeve;

[0020] There are two anti-rotation pins, which respectively threadedly penetrate through the two ear ends of the U-shaped arm and are simultaneously inserted into the inner wall of one of the limiting holes on the front and back of the outer wall of the protective shell.

[0021] Preferably, a fitting is fixedly installed at the top end of the porcelain insulator, and the top of the fitting is fixedly connected to the bottom of the outer wall of the protective shell.

[0022] Preferably, the following is also provided on the porcelain insulator:

[0023] A shock-absorbing mechanism, including:

[0024] The base is fixedly installed at the bottom end of the porcelain insulator;

[0025] The steel foot is fixedly connected to the bottom of the porcelain insulator at the top end, and the bottom end fixedly penetrates downward to the bottom of the outer wall of the base;

[0026] An insulating layer is fixedly sleeved on the outer wall of the through end of the steel foot, and the outer wall of the insulating layer is fixedly connected to the top of the inner wall of the base at the same time;

[0027] Six rubber plates are fixedly sleeved on the outer wall of the steel foot in sequence, and the six rubber plates are fixedly connected between the inner walls of the base at the same time;

[0028] There are four mounting holes, which are sequentially opened at the bottom of the base, and the inner walls of the four mounting holes are all provided with threads.

[0029] Preferably, four guiding grooves are sequentially opened on the outer wall of the base, and steel arms are fixedly installed on the inner walls of the four guiding grooves, and the number of the steel arms is four.

[0030] Preferably, the tops of the four steel arms are sequentially fixedly connected to the bottom of the porcelain insulator.

[0031] Preferably, four umbrella skirts are sequentially fixedly sleeved on the outer wall of the porcelain insulator, and a waterproof film is provided, and the waterproof film is fixedly sleeved on the outer walls of the porcelain insulator and the four umbrella skirts at the same time.

[0032] Preferably, an arcing rod is fixedly installed on the front of the outer wall of the fitting, and the spherical end of the arcing rod extends downward away from the porcelain insulator.

[0033] Preferably, a protective cover is fixedly installed on the front of the rod wall of the arcing rod, and a rhombic mirror surface is provided on the front of the protective cover.

[0034] The present invention provides a post-type porcelain insulator with a protective cover. It has the following beneficial effects:

[0035] (1), In the present invention, one end of the cable is inserted through the inlet hole and passes through the sleeve, the sleeve is rotated in the movable hole, the rotating U arm abuts against the sleeve, and the anti-rotation pin is screwed in to keep the sleeve fixed, the turning handle is tightened, so that the screw rotates and pushes the second clamping seat, and the cable is abutted against the first clamping seat for stable clamping, adjusting the connection angle of the cable outlet end and eliminating the cumbersome replacement of the clamping seat, conveniently adjusting different installation methods of the cable, and reducing the work burden.

[0036] (2), In the present invention, the base is fixedly installed on the transmission line support through bolts penetrating the mounting holes, enhancing the installation stability of the porcelain insulator, multiple rubber plates improving the seismic resistance, the insulating layer being hollow inside, isolating the voltage from directly contacting the rubber plates, preventing the current from damaging the rubber plates, and strengthening the support stability of the porcelain insulator.

[0037] (3), In the present invention, the waterproof film provides waterproof and moisture-proof protection for the porcelain sleeve and umbrella skirt of the porcelain insulator, avoiding long-term corrosion of the porcelain sleeve and umbrella skirt by rainwater, the air gap provided by the arcing rod providing a lightning flashover channel, thereby avoiding the burning of the insulator umbrella group and extending the service life.

[0038] (4) The present invention shields the porcelain insulator with a protective cover to prevent high-altitude rain and snow from directly hitting the porcelain sleeve. At the same time, when the light is sufficient, the rhombic mirror plays a reflective role to drive away birds. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a perspective view of the present invention;

[0040] Figure 2 is a cross-sectional view of the clamping mechanism and the adjusting mechanism of the present invention;

[0041] Figure 3 is a schematic structural view of the porcelain insulator of the present invention;

[0042] Figure 4 is a cross-sectional view of the shock-absorbing mechanism of the present invention;

[0043] Figure 5 is a bottom view of the base of the present invention;

[0044] Figure 6 is a schematic structural view of the arc striking rod and the protective cover of the present invention.

[0045] In the figures: 1, porcelain insulator; 2, clamping mechanism; 201, protective shell; 202, inlet; 203, movable hole; 204, first clamp seat; 205, screw; 206, second clamp seat; 207, turning handle; 208, caliper; 209, ACSR conductor; 3, adjusting mechanism; 301, sleeve; 302, limiting hole; 303, U-shaped arm; 304, anti-rotation pin; 4, fitting; 5, shock-absorbing mechanism; 501, base; 502, steel foot; 503, isolation layer; 504, rubber plate; 505, mounting hole; 6, steel arm; 7, waterproof film; 8, arc striking rod; 9, protective cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0047] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0049] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example 1:

[0051] Such as Figure 1-3As shown in the figure, the present invention provides a technical solution: a columnar porcelain insulator with a protective cover, including a porcelain insulator 1, and the porcelain insulator 1 is provided with: a clamping mechanism 2, including: the protective shell 201 is in a whistle shape, and an inlet 202 is opened on the left side and a movable hole 203 is opened on the right side. The protective shell 201 is used to protect the connection between the porcelain insulator 1 and the cable. The first clamping seat 204 is fixedly installed on the back inner wall of the protective shell 201. One end of the screw 205 threadedly penetrates the front of the protective shell 201 and extends into the protective shell 201. The second clamping seat 206 is fixedly installed on the extended end of the screw 205, and the bottom is attached to the bottom inner wall of the protective shell 201. The rotating handle 207 is fixedly installed on the other end of the screw 205 and is located outside the front of the protective shell 201. The caliper 208 is fixedly installed on the top inner wall of the protective shell 201. One end of the aluminum conductor steel-reinforced 209 is clamped in the jaws of the caliper 208. The caliper 208 clamps the aluminum conductor steel-reinforced 209, which can adjust the extended length of the aluminum conductor steel-reinforced 209 to adapt to the cable, and the other end movably penetrates to the outside of the top of the protective shell 201. The protective shell 201 is provided with an adjusting mechanism 3, and the adjusting mechanism 3 includes: one end of the outer wall front and the outer wall back of the sleeve 301 are respectively hinged to the front inner wall and the back inner wall of the movable hole 203 through the first pin. The sleeve 301 is also slidably connected to the inner wall of the movable hole 203, and the end far from the first pin extends upward. The sleeve 301 is used to extend the cable and change the connection direction of the cable by rotation, providing convenient installation. The number of the limiting holes 302 is six, and every three are respectively opened on the front outer wall and the back outer wall of the protective shell 201 in sequence. The two ear ends of the U-shaped arm 303 are respectively hinged to the right front side and the right back side of the outer wall of the protective shell 201 through the second pin. The top of the side far from the two ear ends of the U-shaped arm 303 is attached to the right outer wall of the sleeve 301. The number of the anti-rotation pins 304 is two, and they respectively threadedly penetrate the two ear ends of the U-shaped arm 303 and are simultaneously inserted into the inner wall of one of the limiting holes 302 on the front outer wall and the back outer wall of the protective shell 201. The top end of the porcelain insulator 1 is fixedly installed with a fitting 4, and the top of the fitting 4 is fixedly connected to the bottom outer wall of the protective shell 201;

[0052] In this embodiment, one end of the cable is passed through the inlet 202 and then out of the sleeve 301. The sleeve 301 is rotated in the movable hole 203. The U-shaped arm 303 is rotated to abut against the sleeve 301, and the anti-rotation pin 304 is screwed in to keep the sleeve 301 fixed. The rotating handle 207 is tightened, so that the screw 205 rotates and pushes the second clamping seat 206 to press the cable against the first clamping seat 204 for stable clamping, adjusting the connection angle of the cable outlet end and eliminating the cumbersome process of replacing the clamping seat, conveniently adjusting different installation methods of the cable, and reducing the work burden.

[0053] Embodiment Two:

[0054] As Figure 1 、 3, as shown in FIGS. 4 and 5, on the basis of the first embodiment, the present invention provides a technical solution: The porcelain insulator 1 is further provided with: The shock-absorbing mechanism 5 includes: The base 501 is fixedly installed at the bottom end of the porcelain insulator 1. The top end of the steel foot 502 is fixedly connected to the bottom of the porcelain insulator 1, and the bottom end extends downward and fixedly penetrates through the bottom wall of the outer wall of the base 501. The isolation layer 503 is fixedly sleeved on the outer wall of the penetrating end of the steel foot 502 to isolate the voltage and prevent the voltage from directly damaging the rubber plate 504 inside the base 501. The outer wall of the isolation layer 503 is simultaneously fixedly connected to the top of the inner wall of the base 501. There are six rubber plates 504, which are fixedly sleeved on the outer wall of the steel foot 502 in sequence. The six rubber plates 504 are simultaneously fixedly connected between the inner walls of the base 501. The rubber plates 504 improve the shock-absorbing performance. There are four mounting holes 505, which are sequentially opened at the bottom of the base 501. The inner walls of the four mounting holes 505 are all provided with threads. Four guiding grooves are sequentially opened on the outer wall of the base 501, and four steel arms 6 are fixedly installed on the inner walls of the four guiding grooves. There are four steel arms 6. The steel arms 6 cooperate with the steel feet 502 to disperse the voltage and maintain electrical connectivity, so that the voltage flows stably to the ground. The top ends of the four steel arms 6 are sequentially fixedly connected to the bottom of the porcelain insulator 1;

[0055] In this embodiment, the base 501 is fixedly installed on the transmission line support through bolts penetrating the mounting holes 505 to enhance the installation stability of the porcelain insulator 1. The multiple rubber plates 504 improve the earthquake resistance ability. The isolation layer 503 is hollow inside, isolating the voltage from directly contacting the rubber plate 504 to prevent the current from damaging the rubber plate 504 and strengthening the support stability of the porcelain insulator 1.

[0056] Embodiment Three:

[0057] As Figure 1 , 3 , as shown in FIGS. 6, on the basis of the first embodiment, the present invention provides a technical solution: Four umbrella skirts are sequentially fixedly sleeved on the outer wall of the porcelain insulator 1, and a waterproof film 7 is provided. The waterproof film 7 is simultaneously fixedly sleeved on the outer walls of the porcelain insulator 1 and the four umbrella skirts. An arc-igniting rod 8 is fixedly installed on the front of the outer wall of the fitting 4. The spherical end of the arc-igniting rod 8 extends away from the porcelain insulator 1 and downward. A protective cover 9 is fixedly installed on the front wall of the rod of the arc-igniting rod 8. A rhombic mirror surface is provided on the front of the protective cover 9;

[0058] In this embodiment, the waterproof film 7 protects the porcelain sleeve and umbrella skirts of the porcelain insulator 1 from water and moisture, avoiding long-term corrosion of the porcelain sleeve and umbrella skirts by rainwater. The air gap provided by the arc-igniting rod 8 provides a flashover channel for lightning, thus avoiding the burning of the insulator umbrella group and extending the service life. The protective cover 9 shields the porcelain insulator 1 to prevent high-altitude rain and snow from directly hitting the porcelain sleeve. At the same time, in the case of sufficient light, the rhombic mirror surface plays a reflecting role to drive away birds.

[0059] When in use, when installed in a supporting manner, the base 501 is fixedly installed on the transmission line rack by bolts penetrating the mounting holes 505, so as to facilitate the vertical installation of the porcelain insulator 1. The bottom end of the steel foot 502 contacts the transmission line rack to maintain electrical connectivity and guide the voltage to the ground through the transmission line rack. The rubber sheet 504 enhances the anti-seismic capability and the supporting stability of the porcelain insulator 1. The isolation layer 503 is hollow inside and can isolate the voltage from directly contacting the rubber sheet 504 to prevent the current from damaging the rubber sheet 504. The four steel arms 6 maintain electrical connectivity with the porcelain insulator 1, disperse the voltage, and cooperate with the steel foot 502. The voltage is guided to the ground. The waterproof membrane 7 is used to protect the porcelain sleeve and the umbrella skirt, and to block rainwater on rainy days to prevent rainwater from corroding the surface of the porcelain insulator 1 for a long time. The air gap provided by the arc-starting rod 8 can discharge before the insulator flashes over, providing a lightning flashover channel. The power frequency arc or the arc root of the single-phase short-circuit current established on the lightning flashover channel can only be fixed on the high and low voltage electrodes provided by the arc-starting rod 8, and will not flow to the insulator body or the conductor, thereby avoiding the burning of the insulator umbrella group and even the burning of the insulated conductor. The protective cover 9 plays a certain protective role in rainy and snowy weather to avoid Prevent rain and snow from directly hitting the porcelain insulator 1. At the same time, in the case of sufficient light, the prismatic mirror can refract light to drive away birds, preventing birds from contacting high-voltage lines and causing accidents. Insert one end of the cable from the line inlet 202 and pass it out from the sleeve 301. Rotate the sleeve 301 in the movable hole 203 to adjust the connection angle of the cable outlet, rotate the U arm 303 to abut against the sleeve 301, screw in the anti-rotation pin 304, and at the same time let the anti-rotation pin 304 be inserted into the corresponding limit hole 302 to keep the sleeve 301 fixed. After the connection is completed, tighten the handle 207 to rotate the screw 205 And push the clamp seat 206, press the cable against the clamp seat 1 204 for stable clamping, and complete the installation of the porcelain insulator 1 and the cable. When the porcelain insulator 1 is installed in a suspended manner, place the porcelain insulator 1 horizontally on the transmission line rack, and tighten the base 501 with bolts, disassemble the shell 201, adjust the caliper 208, so that the steel-core aluminum conductor 209 can be extended to a suitable length, and connect the cable, and then transfer the other end of the steel-core aluminum conductor 209 to make the transfer line pass through the sleeve 301, and then fix the clamp 208 to clamp the steel-core aluminum conductor 209, and finally assemble the shell 201 to complete the suspension installation.

[0060] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a reference structure" does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

Claims

1. A columnar porcelain insulator with a protective cover, comprising a porcelain insulator (1), characterized in that: On the porcelain insulator (1), there are provided: A clamping mechanism (2), including: A protective shell (201), which is in a whistle shape, and has an inlet opening (202) on the left side and a movable hole (203) on the right side; A first clamping seat (204), fixedly installed on the inner wall back surface of the protective shell (201); A screw rod (205), one end of which threadedly penetrates the front surface of the protective shell (201) and extends into the interior of the protective shell (201); A second clamping seat (206), fixedly installed on the extending end of the screw rod (205), and the bottom thereof is in contact with the inner wall bottom of the protective shell (201); A turning handle (207), fixedly installed on the other end of the screw rod (205) and located outside the front surface of the protective shell (201); A caliper (208), fixedly installed on the inner wall top of the protective shell (201); An ACSR conductor (209), one end of which is clamped in the jaws of the caliper (208), and the other end movably penetrates to the outside of the top of the protective shell (201); An adjusting mechanism (3) is provided on the protective shell (201), and the adjusting mechanism (3) includes: A sleeve (301), one end of the outer wall front surface and the outer wall back surface of which are respectively hinged to the inner wall front surface and the inner wall back surface of the movable hole (203) through a first pin. The sleeve (301) is also slidably connected to the inner wall of the movable hole (203), and the end far from the first pin extends upward; There are six limiting holes (302), and every three of them are successively opened on the front outer wall and the back outer wall of the protective shell (201); A U-shaped arm (303), the two ear ends of which are respectively hinged to the front right side and the back right side of the outer wall of the protective shell (201) through a second pin; The top of the side of the U-shaped arm (303) far from the two ear ends is in contact with the right side outer wall of the sleeve (301); There are two anti-rotation pins (304), which respectively threadedly penetrate the two ear ends of the U-shaped arm (303) and are simultaneously inserted into the inner wall of one of the limiting holes (302) on the front outer wall and the back outer wall of the protective shell (201); A fitting (4) is fixedly installed at the top end of the porcelain insulator (1), and the top of the fitting (4) is fixedly connected to the bottom of the outer wall of the protective shell (201). Four umbrella skirts are successively fixedly sleeved on the outer wall of the porcelain insulator (1), and a waterproof film (7) is provided. The waterproof film (7) is also fixedly sleeved on the outer walls of the porcelain insulator (1) and the four umbrella skirts. An arcing rod (8) is fixedly installed on the front outer wall of the fitting (4). The spherical end of the arcing rod (8) extends downward away from the porcelain insulator (1). A protective cover (9) is fixedly installed on the front rod wall of the arcing rod (8). The front surface of the protective cover (9) is provided with a rhombic mirror surface.

2. The columnar porcelain insulator with a protective cover according to claim 1, characterized in that: There is also provided on the porcelain insulator (1): A shock-absorbing mechanism (5), including: A base (501), fixedly installed at the bottom end of the porcelain insulator (1); A steel foot (502), the top end of which is fixedly connected to the bottom of the porcelain insulator (1), and the bottom end fixedly penetrates downward to the bottom of the outer wall of the base (501); The isolation layer (503) is fixedly sleeved on the outer wall of the through end of the steel foot (502), and the outer wall of the isolation layer (503) is fixedly connected to the top of the inner wall of the base (501) at the same time; There are six rubber plates (504), which are fixedly sleeved on the outer wall of the steel foot (502) in sequence, and the six rubber plates (504) are fixedly connected between the inner walls of the base (501) at the same time; There are four mounting holes (505), which are arranged on the bottom of the base (501) in sequence, and the inner walls of the four mounting holes (505) are all threaded.

3. The columnar porcelain insulator with a protective cover according to claim 2, characterized in that: Four guiding grooves are sequentially formed on the outer wall of the base (501), and steel arms (6) are fixedly installed on the inner walls of the four guiding grooves, and the number of the steel arms (6) is four.

4. The columnar porcelain insulator with a protective cover according to claim 3, wherein: The tops of the four steel arms (6) are fixedly connected to the bottom of the porcelain insulator (1) in sequence.

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