A high-temperature electric heating device

Abstract

The embodiments of the present application provide a high-temperature electric heating device, relating to the field of electric heating technology. The high-temperature electric heating device includes a bracket, an electric furnace plate, a copper tube, a porcelain chuck, an electric furnace wire, an insulator, a conductor, a power cord, and an elastic clamp. The bracket supports the electric furnace plate, the electric furnace wire is disposed at the bottom of the electric furnace plate, a mounting plate is disposed on the bracket, a porcelain chuck is disposed on the mounting plate, the copper tube is disposed on the porcelain chuck, the electric furnace wire is at least partially connected to the copper tube, the insulator is disposed on the bracket, the ends of the conductor are respectively connected to the copper tube and the power connection end of the insulator, the elastic clamp clamps the electric furnace wire and the conductor to the copper tube, the power connection end of the insulator is connected to one end of the power cord, and the other end of the power cord is used to connect to the input power supply. This device can reduce the failure rate during long-term use.

Description

Technical Field

[0001] The present application relates to the field of electric heating technology, and in particular to a high-temperature electric heating device. Background Art

[0002] When substances undergo chemical reactions, their reaction rate, reaction equilibrium, etc. are affected by changes in conditions. Chemical equilibrium can only be maintained under certain conditions. When external conditions change, the old chemical equilibrium is destroyed and a new chemical equilibrium state is established. That is, when one of the conditions affecting the equilibrium is changed, the equilibrium moves in a direction that can weaken this change. Therefore, in order to promote certain chemical reactions, heating is one of the conditions. The existing high-temperature electric furnace is a commonly used auxiliary heating device for chemical analysis in steel enterprises.

[0003] There are two main ways to connect the electric furnace wire of the existing high-temperature electric furnace and the AC 220V power supply. The first is to connect through a porcelain clamp; the second is to connect through a porcelain plug fuse. Both are rigid connections. In the porcelain clamp connection method, the electric furnace wire and the power cord are fixed to the copper column inside the porcelain clamp by screws. Due to the corrosion of strong acid and long-term high temperature, the electric furnace wire and the copper column are prone to poor contact. The high temperature generated by the contact resistance will further aggravate the poor contact, and eventually the two are completely disconnected, and the electric furnace cannot work. In the porcelain plug fuse connection method, on the one hand, the plug of the porcelain plug fuse is easily loosened by the uncertain pulling of the power cord, causing the high-temperature electric furnace to power off and not work. On the other hand, due to the corrosion of strong acid and long-term high temperature, the copper moving contact and static contact of the porcelain plug fuse are very likely to have poor contact. The high temperature generated by the contact resistance will further aggravate the poor contact, and eventually the two are completely disconnected, and the electric furnace cannot work. It can be seen that the failure rate of the existing high-temperature electric furnace is high when used for a long time. Summary of the Invention

[0004] The objects of the present application include, for example, providing a high-temperature electric heating device that can reduce the failure rate during long-term use.

[0005] The embodiments of the present application can be implemented as follows:

[0006] An embodiment of the present application provides a high-temperature electric heating device, which includes a bracket, an electric furnace plate, a copper tube, a porcelain chuck, an electric furnace wire, an insulator, a conductor, a power cord and an elastic clamp; the bracket supports the electric furnace plate, the electric furnace wire is arranged at the bottom of the electric furnace plate, a mounting plate is provided on the bracket, a porcelain chuck is provided on the mounting plate, the copper tube is arranged on the porcelain chuck, the electric furnace wire is at least partially connected to the copper tube, the insulator is provided on the bracket, the two ends of the conductor are respectively connected to the copper tube and the power connection end of the insulator, the elastic clamp clamps the electric furnace wire and the conductor to the copper tube, the power connection end of the insulator is connected to one end of the power cord, and the other end of the power cord is used to connect to an input power supply.

[0007] Optionally, the high-temperature electric heating device further comprises aluminum foil, the aluminum foil covers the electric furnace wire and the conducting wire connected to the copper tube, and the elastic clamp clamps the aluminum foil to the copper tube.

[0008] Optionally, one end of the electric furnace wire is wound around the copper tube, and a portion of the electric furnace wire that is led out of the electric furnace plate and not wound around the copper tube is sheathed with a porcelain sleeve.

[0009] Optionally, the conductor includes multiple strands of plastic copper wire, one end of the multiple strands of plastic copper wire is wound around the copper tube, and the other end of the multiple strands of plastic copper wire is wound around the power connection end of the insulator.

[0010] Optionally, a nut is provided on the insulator, and the nut is threadedly matched with the power connection end of the insulator, and the nut is used to compress the multi-strand plastic copper wire and the power line.

[0011] Optionally, a washer is further provided on the insulator, and the nut is used to compress the multi-strand plastic copper wire and the power line through the washer.

[0012] Optionally, the elastic clamp includes an arc-shaped clamping section and a pressing section, the pressing sections are provided at both ends of the arc-shaped clamping section, the arc-shaped clamping section has a clamping opening, the pressing section extends in a direction away from the clamping opening, and the arc-shaped clamping section clamps the electric furnace wire and the conductive wire to the copper tube.

[0013] Optionally, an angle steel is provided on the bracket, and the insulator is fixed on the angle steel.

[0014] The beneficial effects of the high-temperature electric heating device of the embodiment of the present application include, for example: a copper tube is arranged on the porcelain clamp, at least a part of the electric furnace wire is connected to the copper tube, and the two ends of the wire are respectively connected to the power connection ends of the copper tube and the insulator, and the electric furnace wire and the wire are clamped to the copper tube by an elastic clamp, and the electric furnace wire and the wire are in good contact with the copper tube under the elastic pressure of the elastic clamp; the power cord is connected to the power connection end of the insulator, and the power cord is fixed to the power connection end of the insulator, eliminating the failure of the porcelain plug fuse of the existing high-temperature electric furnace to become loose due to the uncertain tension of the power cord, thereby reducing the failure rate of the high-temperature electric heating device during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic structural diagram of a high-temperature electric heating device in an embodiment of the present application;

[0017] Figure 2 This is a schematic structural diagram of the elastic clip in an embodiment of the present application;

[0018] Figure 3 This is a schematic structural diagram of a porcelain chuck in an embodiment of the present application;

[0019] Figure 4 This is an electrical schematic diagram in an embodiment of the present application.

[0020] Icons: 100-bracket; 200-electric furnace plate; 300-copper tube; 400-insulator; 500-elastic clamp; 510-arc-shaped clamping section; 520-pressing section; 600-porcelain chuck; 700-mounting plate; 800-angle steel. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of this application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the invented product is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0025] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0026] It should be noted that, in the absence of conflict, the features in the embodiments of this application can be combined with each other.

[0027] The inventors of this application have discovered that the existing high-temperature electric furnaces use a porcelain clamp or a porcelain plug fuse to connect the electric furnace wire to the AC power supply. Both of these connection methods are prone to poor contact during long-term use of the high-temperature electric furnace, resulting in a high failure rate of the high-temperature electric furnace. The embodiments of this application provide a high-temperature electric heating device that can reduce the failure rate during long-term use.

[0028] Please refer to Figure 1-Figure 3The high-temperature electric heating device provided in the embodiment of the present application includes a bracket 100, an electric furnace plate 200, a copper tube 300, an electric furnace wire, an insulator 400, a wire, a power cord, an elastic clamp 500 and a porcelain clamp 600; the bracket 100 supports the electric furnace plate 200, the electric furnace wire is arranged at the bottom of the electric furnace plate 200, the electric furnace wire is at least partially connected to the copper tube 300, the insulator 400 is arranged on the bracket 100, the two ends of the wire are respectively connected to the power connection ends of the copper tube 300 and the insulator 400, the elastic clamp 500 clamps the electric furnace wire and the wire The bracket 100 is supported on the copper tube 300, and the power connection end of the insulator 400 is connected to one end of the power line, and the other end of the power line is used to connect to the input power supply; a mounting plate 700 is provided on the bracket 100, and a porcelain chuck 600 is provided on the mounting plate 700. The copper tube 300 is horizontally arranged on the porcelain chuck 600. The two ends of each copper tube 300 are respectively fixed to the mounting plate 700 by two porcelain chucks 600. The porcelain chuck 600 can insulate the charged copper tube 300 from the bracket 100, and the porcelain chuck 600 has high temperature resistance.

[0029] It should be noted that the electric stove plate 200 is mounted on the bracket 100, and the electric heating wire is coiled around the bottom of the electric stove plate 200. One end of the electric heating wire extends out and is connected to the copper tube 300. The insulator 400 is made of bakelite, and the elastic clamp 500 is made of an elastic material and is inherently elastic. The elastic clamp 500 uses its own elastic force to clamp the electric heating wire and the wire to the copper tube 300. During the electric heating process, the input power is connected to the power terminal of the insulator 400 through the power cord, and then to the copper tube 300 through the wire. Finally, the copper tube 300 energizes the electric heating wire, and the electric heating wire can heat the reagents on the electric stove plate 200.

[0030] A mounting plate 700 is provided on the bracket 100, and a porcelain chuck 600 is provided on the mounting plate 700. A copper tube 300 is provided on the porcelain chuck 600. One end of the electric furnace wire is extended and connected to the copper tube 300, and the two ends of the wire are respectively connected to the power connection ends of the copper tube 300 and the insulator 400. The elastic clamp 500 is used to clamp the electric furnace wire and the wire to the copper tube 300 by its own elastic force. Under the elastic pressure of the elastic clamp 500, the electric furnace wire and the wire are in good contact with the copper tube 300; the power cord is connected to the power connection end of the insulator 400, and the power cord is fixed to the power connection end of the insulator 400, eliminating the problem of the porcelain plug fuse being easily loosened due to the uncertain tension of the power cord in the existing high-temperature electric furnace, thereby reducing the failure rate of the high-temperature electric heating device during long-term use.

[0031] In an optional embodiment, multiple electric furnace plates 200, electric furnace wires, copper tubes 300, porcelain chucks 600, elastic clips 500 and insulators 400 are provided, and the number of electric furnace plates 200, electric furnace wires, copper tubes 300 and insulators 400 matches. The electric furnace plates 200, copper tubes 300 and insulators 400 are all arranged in sequence on the bracket 100, and multiple electric furnace wires are arranged one by one at the bottom of multiple electric furnace plates 200. Each electric furnace wire has two protruding ends, and the two protruding ends of each electric furnace wire are respectively connected to two adjacent copper tubes 300. A wire is connected between the power connection end of a single copper tube 300 and the corresponding insulator 400; some elastic clips 500 clamp the electric furnace wires to the copper tube 300, and some elastic clips 500 clamp the wires to the copper tube 300.

[0032] For example, there are four electric furnace plates 200, electric furnace wires, copper tubes 300 and insulators 400. In the arrangement direction of the electric furnace plates 200, the two ends of the electric furnace wires at the bottom of the first electric furnace plate 200 and the second electric furnace plate 200 are respectively connected to the first copper tube 300 and the second copper tube 300, and the two ends of the electric furnace wires at the bottom of the third electric furnace plate 200 and the fourth electric furnace plate 200 are respectively connected to the third copper tube 300 and the fourth copper tube 300. The connection between the extended end of each electric furnace wire and the copper tube 300 is fixed by an elastic clip 500, and each copper tube 300 is provided with an elastic clip 500 for clamping the wire.

[0033] In an optional embodiment, the high-temperature electric heating device further includes aluminum foil, which covers the electric furnace wire and the wire connected to the copper tube 300 , and the elastic clamp 500 clamps the aluminum foil to the copper tube 300 .

[0034] On the one hand, the portion of the copper tube 300 connected to the furnace wire is covered with aluminum foil, thereby increasing the contact area between the furnace wire and the copper tube 300. By clamping the elastic clamp 500 outside the aluminum foil, the furnace wire is pressed against the copper tube 300, so that the furnace wire and the copper tube 300 are in good contact, and the connection between the furnace wire and the copper tube 300 can be minimized by acid corrosion, while reducing contact resistance and ensuring good conductivity; on the other hand, the portion of the copper tube 300 connected to the wire is covered with aluminum foil, thereby increasing the contact area between the wire and the copper tube 300. By clamping the elastic clamp 500 outside the aluminum foil, the wire is pressed against the copper tube 300, so that the wire and the copper tube 300 are in good contact, and the connection between the wire and the copper tube 300 can be minimized by acid corrosion.

[0035] In an optional embodiment, one end of the electric furnace wire is wound around the copper tube 300 , and the portion of the electric furnace wire that is led out of the electric furnace plate 200 and is not wound around the copper tube 300 is sheathed with a porcelain sleeve.

[0036] In fact, the part of the electric furnace wire that is led out of the electric furnace plate 200 and is not wrapped around the copper tube 300 is insulated with a porcelain sleeve, and the part of the electric furnace wire that contacts the copper tube 300 is wrapped around the copper tube 300 for more than one circle, which can increase the contact area between the electric furnace wire and the copper tube 300; the electric furnace wire connected to the copper tube 300 is wrapped with aluminum foil, and then the aluminum foil is clamped with an elastic clamp 500. The electric furnace wire and the copper tube 300 are tightly elastically pressed together by the elastic clamp 500 and the aluminum foil, and are not subject to the problem of poor contact caused by high-temperature deformation of the material.

[0037] In an optional embodiment, the conductor includes multiple strands of plastic copper wire, one end of which is wound around the copper tube 300 , and the other end of which is wound around the power connection end of the insulator 400 .

[0038] It should be noted that the cross-sectional area of ​​the conductor is greater than or equal to 4mm 2 Compared to bare copper and bare aluminum braided wire, this multi-strand plastic copper wire is more corrosion-resistant, more suitable for use in acidic environments, and has a longer service life. Compared to existing electric furnaces, the use of insulator 400 can secure the power cord, preventing the fuse plug from easily falling off, and improves insulation.

[0039] In fact, the copper tube 300 and the power connection end of the insulator 400 are connected by multi-strand plastic copper wires. The insulating plastic sheath of the multi-strand plastic copper wires can prevent the copper wires from being corroded by acid. The part of the plastic copper wire wrapped around the copper tube 300 is wrapped with aluminum foil, and the aluminum foil is clamped by an elastic clamp 500. The plastic copper wire and the copper tube 300 are tightly elastically pressed together by the elastic clamp 500 and the aluminum foil, and are not subject to the problem of poor contact caused by high-temperature deformation of the material.

[0040] In an optional embodiment, a nut is provided on the insulator 400, and the nut is threadedly matched with the power connection end of the insulator 400, and the nut is used to compress the multi-strand plastic copper wire and the power line.

[0041] It should be pointed out that there is a threaded section on the power connection end of the insulator 400, and the nut is threadedly engaged with the threaded section. When the multi-strand plastic copper wire and the power cord are connected to the power connection end of the insulator 400, the multi-strand plastic copper wire and the power cord are pressed against the insulator 400 by tightening the nut.

[0042] In addition, a washer is provided on the insulator 400, and a nut is used to compress the multi-strand plastic copper wire and the power line through the washer.

[0043] One end of the multi-strand plastic copper wire away from the copper tube 300 is connected to the power connection end of the insulator 400. When the nut is tightened, the large surface of the washer crimps the multi-strand plastic copper wire and the power line to the power connection end of the insulator 400. The surface contact method of the nut and washer eliminates the poor contact problem caused by hard contact and point contact of the porcelain plug fuse in the existing high-temperature electric furnace, and the failure rate of the high-temperature electric heating device is greatly reduced.

[0044] In an optional embodiment, the elastic clamp 500 includes an arc-shaped clamping section 510 and a pressing section 520. Pressing sections 520 are provided at both ends of the arc-shaped clamping section 510. The arc-shaped clamping section 510 has a clamping opening. The pressing section 520 extends in a direction away from the clamping opening. The arc-shaped clamping section 510 clamps the electric furnace wire and the wire to the copper tube 300.

[0045] It should be noted that the diameter of the arc-shaped clamping section 510 in its natural state is 16 mm, the outer diameter of the copper tube 300 is 16 mm, and the wall thickness is 2 mm. The current carrying capacity and support strength of the copper tube 300 of this specification fully meet practical requirements.

[0046] When clamping the electric furnace wire or wire with the elastic clamp 500, hold the two pressing sections 520 and move the two pressing sections 520 close to each other. At this time, the clamping opening of the arc-shaped clamping section 510 expands, and the copper tube 300 is clamped into the clamping opening of the arc-shaped clamping section 510. Then release the pressing section 520, and the clamping opening of the arc-shaped clamping section 510 shrinks to cooperate with the aluminum foil to clamp the electric furnace wire or wire to the copper tube 300.

[0047] In an optional embodiment, an angle steel 800 is provided on the bracket 100 , and the insulator 400 is fixed on the angle steel 800 .

[0048] It should be noted that the angle steel 800 is set at the bottom of the bracket 100, the bottom end of the insulator 400 is fixed on the angle steel 800, the power connection end of the insulator 400 is insulated from the angle steel 800, and the power connection end of the insulator 400 is set upward.

[0049] Please refer to Figure 4 , Figure 4 Node A connects to the live wire, node N connects to the neutral wire, node P is the connection point between the power line and the conductor at the power connection end of insulator 400, node Q is the connection point between the conductor, the heating wire, and the aluminum foil on the copper tube 300, K represents the air switch, and R represents the resistance wire. The electrical principle of this application is as follows: When the air switch is closed, 220V AC power is added to the power line through the air switch. The power line transmits the power to the power connection end of insulator 400, and the power is transmitted to the copper tube 300 serving as the live and neutral wires through the conductor fixed to insulator 400. Finally, the power is transferred to the ends of the heating wire through the aluminum foil and copper tube 300, heating the heating wire.

[0050] The high-temperature electric heating device provided by the embodiment of the present application includes at least the following technical effects: First, the failure rate is low. Compared with the existing high-temperature electric furnace, since a porcelain plug fuse is not used, the failure of poor contact and the failure of power failure caused by plug falling off are eliminated; the design of the insulator 400, the power cord is fixed at the power connection end of the insulator 400, eliminating the failure of the porcelain plug fuse plug to become loose due to the uncertain tension of the power cord in the existing high-temperature electric furnace; the elastic pressure contact between the electric furnace wire and the copper tube 300 and the acid-proof wrapping protection of the elastic clip 500 and the aluminum foil ensure good contact between the electric furnace wire and the copper tube 300; the elastic pressure contact between the wire and the copper tube 300 and the acid-proof wrapping protection of the elastic clip 500 and the aluminum foil ensure good contact between the wire and the copper tube 300; the end of the wire away from the copper tube 300 and the power cord are crimped at the power connection end of the insulator 400 through a nut and a washer, ensuring good contact between the power cord and the wire. Second, the repair and maintenance costs are low. Since the problems of poor contact, power outages, and corrosion of the contact parts have been solved, the failure rate of the electric heating device has been greatly reduced. At the same time, even if repairs and replacement materials are required, the cost of these materials is negligible compared to the cost of solving the above problems. Third, materials and accessories are easy to purchase. The copper tube 300, porcelain chuck 600, elastic clamp 500, aluminum foil, insulator 400 and other materials and accessories used in the embodiment of the present application are all common materials and components on the market, easy to purchase and low in price. Fourth, the operating cost is low and production is orderly. The electric heating device achieves a low failure rate, low maintenance cost, and low spare parts consumption. Compared with the operating cost of existing high-temperature electric furnaces, it has a low operating cost and a high intact rate, which does not affect production. Fifth, safety hazards are eliminated. The electric heating device has a tight and reliable structure. There is no situation where the porcelain plug fuse plug is loose and falls on the work surface, which may cause electric shock to the staff. An insulating safety baffle is also set on the front side of the bracket 100 to eliminate the possibility of accidental electric shock to the staff.

[0051] In summary, the embodiment of the present application provides a high-temperature electric heating device, in which a copper tube 300 is arranged on the mounting plate 700 of the bracket 100, one end of the electric furnace wire is extended out and wound around the copper tube 300, and the two ends of the wire are respectively connected to the power connection ends of the copper tube 300 and the insulator 400, and the elastic clamp 500 is used to clamp the electric furnace wire and the wire to the copper tube 300 by its own elastic force. The electric furnace wire and the wire are in good contact with the copper tube 300 under the elastic pressure of the elastic clamp 500 and the aluminum foil; the power cord is fixed to the power connection end of the insulator 400 by a nut and a washer, eliminating the problem of the porcelain plug fuse being easily loosened due to the uncertain tension of the power cord in the existing high-temperature electric furnace, thereby reducing the failure rate of the high-temperature electric heating device during long-term use.

[0052] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A high-temperature electric heating device, characterized in that: Including bracket, electric furnace plate, copper tube, porcelain chuck, electric furnace wire, insulator, conductor, power cord and elastic clamp; The bracket supports the electric furnace plate, the electric furnace wire is arranged at the bottom of the electric furnace plate, the bracket is provided with a mounting plate, the mounting plate is provided with a porcelain chuck, the copper tube is provided on the porcelain chuck, the electric furnace wire is at least partially connected to the copper tube, the insulator is provided on the bracket, the two ends of the wire are respectively connected to the copper tube and the power connection end of the insulator, the elastic clamp clamps the electric furnace wire and the wire to the copper tube, the power connection end of the insulator is connected to one end of the power cord, and the other end of the power cord is used to be connected to an input power supply.

2. The high temperature electric heating device according to claim 1, characterized in that: The high-temperature electric heating device further comprises aluminum foil, which covers the electric furnace wire and the conducting wire connected to the copper tube, and the elastic clamp clamps the aluminum foil to the copper tube.

3. The high temperature electric heating device according to claim 1, characterized in that: One end of the electric furnace wire is wound around the copper tube, and a portion of the electric furnace wire that is led out of the electric furnace plate and not wound around the copper tube is sleeved with a porcelain sleeve.

4. The high temperature electric heating device according to claim 1, characterized in that: The conductor comprises a plurality of plastic copper wires, one end of which is wound around the copper tube, and the other end of which is wound around the power connection end of the insulator.

5. The high temperature electric heating device according to claim 4, characterized in that: The insulator is provided with a nut, the nut and the power connection end of the insulator are threadedly matched, and the nut is used to compress the multi-strand plastic copper wire and the power line.

6. The high temperature electric heating device according to claim 5, characterized in that: The insulator is further provided with a washer, and the nut is used for pressing the multi-strand plastic copper wire and the power line through the washer.

7. The high temperature electric heating device according to claim 1, characterized in that: The elastic clamp includes an arc-shaped clamping section and a pressing section. The pressing sections are provided at both ends of the arc-shaped clamping section. The arc-shaped clamping section has a clamping opening. The pressing section extends in a direction away from the clamping opening. The arc-shaped clamping section clamps the electric furnace wire and the conductive wire to the copper tube.

8. The high temperature electric heating device according to claim 1, characterized in that: An angle steel is provided on the bracket, and the insulator is fixed on the angle steel.

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